XL2 OPERATING MANUAL HANDHELD AUDIO AND ACOUSTIC ANALYZER
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Table of Contents Table of Contents 1. Introduction......................................................................5 2. Overview...........................................................................7 Operation........................................................................9 The Screen Display....................................................... 11 3. Getting Started..............................................................14 Power Supply . ..........................................
Table of Contents 11. Data Management.....................................................164 Record Voice Notes..................................................... 169 Recall Measurements................................................. 175 Append Measurements ............................................. 177 12. XL2 Data Explorer (optional).................................... 182 13. XL2 Projector Software............................................. 184 14. Monitoring Network............................
Introduction 1. Introduction Thank you for purchasing the XL2 Audio and Acoustic Analyzer. The XL2 Analyzer forms the unique combination of a state-ofthe-art Sound Level Meter, a comprehensive Acoustic Analyzer as well as a powerful Audio Analyzer.
Introduction Product Configurations The following items are included with the respective model: 6 XL2 without Microphone: • • • • • • XL2 + M2230: • XL2 Analyzer • M2230 Measurement Microphone consisting of -- MA220 Microphone PreAmplifier -- Microphone Capsule for M2230 • 50 mm Windscreen • Microphone-holder MH01 with Adapter 5/8“ - 3/8“ • Individual Frequency Response Chart • Test Signal CD • Li-Po battery • USB cable • Hand strap • Operating manual XL2 + M2211: • XL2 Analyzer • M2211 Measurement
Overview 2.
Overview 1 XLR Signal Input Either a balanced audio signal, an NTi Audio measurement microphone or the microphone pre-amplifier MA220 plug directly into the XLR input. The Automated Sensor Detection (ASD) technology reads the electronic data sheet of any connected NTi Audio device after the 48 V microphone phantom power is activated. 2 RCA Input Unbalanced audio signal input. 3 Voice Note Input Internal microphone for recording voice notes and measuring polarity and delay time.
Overview Operation 2 9 8 6 7 Volume of Speaker and Headphone Output • Press the button briefly to enable or disable the speaker. The speaker is activated and the speaker or headphone icon shows up in the upper menu bar. • Press and hold the speaker button 1 A pop-up window for volume is displayed. 5 2 1 . 3 4 Page Control Switches among various screens depending on the menu function selected.
Overview • Hold the speaker button down and adjust the level of the speaker and headphone outputs with the rotary wheel . Digital gain control prevents gain increases beyond a level that will cause signal clipping. The maximum gain setting depends on the connected input signal. • The headphone output provides a linear output signal using the SLMeter function (for input levels of approx. -30 dBu and higher, which equals at M2230: 85 dBA, M2211: 92 dBA utilizing a pink noise test signal).
Overview The Screen Display The XL2 displays the actual sound levels also in case of no measurement has been started. Any displayed averaged level refers to the previous measurement period. The XL2 shows four lines in case of no previous measurement period is applicable. Updating of display • Numeric values Updated every 500ms independent of the measurement function. The maximum time span between the end of the measurement period and the first test result display is 500ms.
Overview 1 Measurement Results Individual level measurement results.
Overview After a completed measurement, the memory symbol indicates a non-saved measurement report. Your measurement needs to be stored manually. For more details visit the chapter Data Management. 6 7 Speaker/Headphone Indication of enabled rear speaker or headphone output. Phantom Power Supply 48V The XL2 provides 48 V phantom power supply to the connection microphone or sensor. ASD An NTi Audio measurement microphone with automated sensor detection ASD is connected.
Getting Started 3. Getting Started Power Supply The XL2 offers flexible power management options and can be operated either by • Replaceable, rechargeable lithium-polymer (Li-Po) battery (included with the XL2 Analyzer) • 4x AA-batteries • Mains Power Adapter The new battery is charged to approximately 50% and should be fully charged before use with: Battery Charger (optional) Charging Time: approx. 3 hours NTi Audio #: 600 000 332 Mains Power Adapter (optional) Charging Time: approx.
Getting Started Rechargeable Li-Po Battery • Open the battery cover at the rear of the instrument. • Insert the rechargeable Li-Po battery with the contacts edge first. • Close the battery cover. 3. Switch off the XL2 for faster recharging by mains power adapter or USB connection. Caution • Switch the XL2 off prior opening the battery cover in order to prevent any electronic discharges. • Avoid short-circuits. • Operate and charge the battery between 0°C and 45°C (32°F - 113°F).
Getting Started AA-Batteries Alternatively, the XL2 can be powered by AA type batteries • Open the battery cover. • Insert 4 fully-charged AA batteries, observing correct polarity of the +/- indications in the battery compartment. 2. The polarity alternates with successive batteries. • Close the battery cover. • Switch the XL2 off prior opening the battery cover in order to prevent any electronic discharges. • Use only similar batteries from the same manufacturer.
Getting Started Attaching the Hand Strap To avoid accidentally dropping the XL2, a hand strap is supplied with the instrument. • Pull the loop of the hand strap through the opening. • Pull the other end of the hand strap through the loop. • Pull the hand strap tight. 1. 2. 3.
Getting Started Unfolding the Stand Connecting the XL2 A convenient table stand is attached to the rear of the instrument. Acoustic Measurements Connect an NTi Audio measurement microphone to the XLR input connector of the XL2. • Unfold the stand and rest the XL2 on a flat surface.
Getting Started Audio Measurements: XLR Connection • Connect the source to the XL2 with an XLR cable. • Select the XLR input in the menu. Audio Measurements: RCA Connection • Connect the source to the XL2 with an RCA (cinch) cable. • Select the RCA input in the menu.
Getting Started Switching the XL2 On and Off Select Measurement Function Switching On the XL2 • Navigate with the rotary wheel to the main menu bar. • Confirm with enter to select the measurement function. Press power to switch on the XL2. The main menu window opens There is a brief sound of relays and the display illuminates. Switching Off the XL2 Press power the XL2.
Getting Started Setting the Parameters with the Rotary Wheel • Turn the rotary wheel to navigate within the display screen. The selected parameter is highlighted with a black background. Calibration prior Measurement We recommend the daily calibration of the XL2 Analyzer with the precision calibrator. This ensures accurate measurement results. For more details see chapter Calibration. • Confirm with enter . The parameter display flashes and/or available parameters or settings are shown.
Sound Level Meter 4. Sound Level Meter The XL2 provides, together with the measurement microphone, a precise sound level meter for monitoring live sound events and/or environmental noise. Extended Acoustic Pack (optional) The Extended Acoustic Pack offers the following additional features for sound-level and acoustic measurements: The Type Approval Option upgrades the instrument to the XL2-TA, the sound level meter dedicated to certified measurements.
Sound Level Meter The sound level meter offers different pages: Page Selection using the Page Button • Press page to toggle between the 123 SLMeter page and the RTA page. Page Selection using the Rotary Wheel • Select the page 123 SLMeter with the rotary wheel • Confirm with enter . 123 SLMeter: Sound Level Meter Displays the selected broadband sound level results. You can change the font size of the result. Depending on the font size chosen, the XL2 shows 3 or 5 results simultaneously.
Sound Level Meter Logging: Setup of Data Logging The XL2 features a powerful sound level meter data logger, which allows you to record all required sound level values during the measurement. In the logging page you set which sound pressure levels shall be logged over time. For details refer to the chapter Logging. Choose between: ALL Logs all sound pressure levels. Selected Logs up to 10 different individually-defined sound pressure levels.
Sound Level Meter Set EQt, L%: Selection of measured levels This page allows setting the following levels: • Moving Time-average Sound Level Gliding LAeq with selectable time window from five seconds to one hour. Four individual levels can be configured. • Percentile Sound Level -- Allows the individual configuration of seven static levels from 1% to 99% (optional with Extended Acoustic Pack).
Sound Level Meter Overview Numeric Result Page The numeric result page 123 SLMeter displays the selected broadband sound level results. You can change the font size of the result. Depending on the font size chosen, the XL2 shows three or five results simultaneously. Individual frequency weighting, time weighting, actual, minimum, maximum and correction values can be chosen for each displayed result.
Sound Level Meter 1 Sound Level Result 1 All sound levels are measured and logged simultaneously. You select which sound levels should be displayed. 4 Change Parameter • Turn the rotary wheel to select the parameter Lxx. • Press enter to open the selection menu and choose the wideband sound pressure level to be displayed. • Turn the rotary wheel to select the required test result parameters and confirm with enter .
Sound Level Meter 6 Actual Measurement Time Counts actual measurement time in hrs:min:sec. Supports time modes: continuous, single and (synchronized) repeat. Timer Mode Continuous (applicable for standard measurements) All values are recorded and monitored continuously after starting a measurement with start . The actual measurement time is shown. Timer Mode Single Automatically stops the measurement after the pre-set measurement time. • Set the required measurement time. • Start the measurement .
Sound Level Meter 8 Timer Mode Repeat Synchronized Provides automated repeated measurements synchronized to the XL2 real-time clock. Press start to begin the measurement. In order to align the selected preset measurement time with the real-time clock, the XL2 shortens the first cycle to match the real-time clock synchronization. All following measurement cycles are synchronized to the real-time clock. For example, the cycle time setting is 30 minutes and the measurement starts at 7.50 a.m.
Sound Level Meter • Capture One of the displayed RTA readings may be captured. Any measurement data can then be compared with this captured reference live on the XL2 Analyzer. For example, compare the RTA spectrum of the left and right speakers. • Select the parameter to be captured. • Confirm with enter , to capture the reading. • Select the upper RTA parameter 15 and choose Capt. • Confirm with enter . 10 The lower RTA reading can be compared with the previously-captured reference data.
Sound Level Meter 14 The cursor read out may be set manually to any frequency band or wide band level. The read out remains at the selected frequency. • Select the frequency with the rotary wheel . • Press enter . • Select the frequency of interest. • Confirm with enter . Broadband Results Actual sound level with time weighting F (=Fast).
Sound Level Meter 17 32 Measurement Unit Select the measurement unit as follows: dB Sound level in dBSPL This measurement unit is permanently selected upon connecting a NTi Audio measurement microphone with electronic data sheet. dBu Input level in dBu dBV Input level in dBV V Input level in Volt LOW - Indication The low indicator for an individual level < is displayed when: • The measured sound pressure level is below the selected linear measurement range.
Sound Level Meter Overload Indication In case the measurement result exceeds the preset measurement range, then limit arrows indicate this overload condition. The arrows are displayed for minimum 1 seconds and as long as the overload exists. Furthermore the once exceeded measurement range triggers the OVR indication in the bottom line, which remains displayed for the complete measurement period. These exceeded range indications are reset at starting a new measurement.
Sound Level Meter Sound Level Meter - Getting Started Test Preparations The XL2 reads the electronic data sheet of any connected ASD microphones provided by NTi Audio and switches the 48V phantom power automatically on as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2 . Select Displayed Test Result This example describes the setting of the commonly-used actual sound pressure level LAF (frequency weighting A, time weighting F).
Sound Level Meter Select Frequency Weighting Select Time Weighting The pop-up window FREQ WEIGHTING shows up. • Select the frequency weighting A. The pop-up window extends with TIME WEIGHTING. • Select the required time weighting; e.g., (=Fast). Pop-up windows shown at installed Extended Acoustic Option • Confirm with enter . • Confirm with enter .
Sound Level Meter Select Parameter Select Correction Value The pop-up window extends with PARAMETER settings. • Select the parameter live. The pop-up window extends with CORRECTION settings. • Select the parameter off. • Confirm with enter • Confirm with enter 36 . . The pop-up window closes and the measured sound pressure level LAF is displayed.
Sound Level Meter Select further Sound Levels Select Input Range • Select the lowest possible input range according to the maximum level expected during the measurement. Wrong input ranges are indicated by a < in front of the measurement value or a flashing OVR message in the lower menu bar. • Select the input range RNGE and press enter . • Turn the rotary wheel to set the applicable input range and confirm with enter . The numeric result page and the real-time analyzer page use the same input range.
Sound Level Meter Start Measurement • The XL2 is ready to measure the sound levels LAF, LAeq and LAFmax. • Press start . 38 The run indication switches to running . The integrated sound pressure level over time LAeq and the maximum level in the measurement period LAFmax are displayed. The parameter RUN, LOG (logging is enabled) or AUD (audio recording is configured) flashes in the memory menu. Stop the Measurement • Press stop to stop the measurement .
Sound Level Meter Save the Measurement Result • Select the memory menu with the rotary wheel confirm with enter . and The XL2 stores the numeric sound pressure levels and the real-time analyzer results simultaneously. The memory menu opens. Save Test is preselected. The sound pressure level measurement is completed.
Sound Level Meter RTA Measurement - Getting Started Test Preparations The XL2 reads the electronic data sheet of any connected ASD microphones provided by NTi Audio and switches the 48V phantom power automatically on as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2 . RTA Configuration The XL2 displays two different sound pressure levels at the same time. You configure which test results to display; e.g., LZFmax and LZFlive. • Ensure no other measurement is going on.
Sound Level Meter Select RTA Frequency Weighting Select RTA Time Weighting The pop-up window FREQ WEIGHTING shows up. • Select the frequency weighting Z. • Confirm with enter The pop-up window extends with TIME WEIGHTING. • Select the required time weighting; e.g., (=Fast). . Press start to measure and display the sound levels results indicated with ----. • Confirm with enter .
Sound Level Meter Select Upper/Lower RTA Parameter • Select the parameter shown to the right of the upper LZF value with the rotary wheel ; e.g. max. • Press enter . The pop-up window PARAMETER shows up. • Select the parameter max. Select Input Range • Select the lowest possible input range according to the maximum level expected during the measurement. Wrong input ranges are indicated by a < in front of the measurement value or a flashing OVR message in the lower menu bar.
Sound Level Meter Start RTA Measurement • The XL2 is ready to display the measured sound pressure levels LZFmax and LZFlive. • Press start . Stop the RTA Measurement • Press stop . The run indication switches to running . The actual sound level LZFlive and the maximum level LAFmax are displayed. The parameter RUN , LOG (logging is enabled) or AUD (audio recording is configured) flashes in the memory menu.
Sound Level Meter Save the RTA Measurement Result • Select the memory menu with the rotary wheel confirm with enter . and The memory menu opens. • Press enter to store the test results or select Save Screenshot to store the screenshot. 44 The RTA measurement is completed.
Sound Level Meter Reporting Leq, Lmax, The RTA Leq, Lmin, Lmax levels are stored Lmin in the report. A report saves the conducted measurements onto the installed SD Card. The XL2 Supports setting the individual levels to be stored in the report after the measurement is completed. All 2 Report Values Choose between the following result reporting: ALL Records all available sound pressure levels without correction values.
Sound Level Meter Logging 1 The XL2 features a powerful sound level meter data logger, which allows you to record all required sound level values during the selected period of time. All results are logged onto the SD Card. The measurement results can be loaded to a PC for documentation and visualization. The LOG menu offers the detailed setup of the log report. 1 2 3 4 5 6 7 46 Logging Select Logging with the rotary wheel and press enter to enable the automated logging of test results.
Sound Level Meter 4 Log Audio The XL2 logs audio data as a wav-file. Choose among the following settings: Off Audio logging is off On Audio logging is activate from measurement start to stop. Events Only Audio logging of triggered events only. For more details read the chapters Wav-File Recording and Events.
Sound Level Meter Wav-File Recording The XL2 records a wav-file of the measured input signal and stores it on the SD Card. The available formats are: • Compressed (default, using ADPCM compression). A new wav-file is started automatically after 12 hours of recording (typical maximum wav-file size = 512 MByte) • Compressed+AGC, compressed with automated gain control. The gain control increases the level of low-level signals, so that the wav-file is well-leveled during playback on the PC.
Sound Level Meter The advantage of wav-file recordings is to identify and document sound sources after the measurement. For example, at a live event an excessive peak level may have been measured and logged. Actually, this peak level was caused by people shouting nearby the measurement microphone, and not by the audio system being monitored. The recorded wav-file assists in verifying this and the test results can then be post-processed.
Sound Level Meter Events (optional) The event function is available with the XL2 Extended Acoustic Pack Option. The XL2 Analyzer may be configured to record wav-files and additional noise levels only when triggered, instead of the complete measurement duration. Advantages Reduces the data volume acquired, thereby • Simplifying data post-processing of the complete measurement period • Saving data memory for long-term measurement applications.
Sound Level Meter Trigger Events: on level above/below 14 90 Event Duration Level [dB] 100 1 2 80 13 3 12 4 14 3 70 60 2 5 13 12 6 7 8 Time [seconds] 9 10 11 Features: • The levels LAeq, LZeq and LCPeak are recorded for the event duration. • Audio data are recorded for the triggered event duration only, thus simplifying data post-processing and saving memory space for long-term measurements. • Setting markers by external key press of the XL2 Input Keypad.
Sound Level Meter Trigger Events: on external key press 90 Event Duration Level [dB] 100 Event Duration 15 80 15 key press 60 key press 70 15 Time [seconds] Features: • The levels LAeq, LZeq and LCPeak are recorded for the event duration. • Audio data may be recorded for the user-defined event duration 15 after the key press. • Retrigger with every repeated key press within the event duration.
Sound Level Meter 1 2 Trigger Events Choose from the following settings: Off No event triggering on level above Events are triggered at noise levels above the preset value 2 for the start duration 13 . on level below Events are triggered at noise levels below the preset value 2 for the start duration 13 . on ext. key press Events are triggered by external key press.
Sound Level Meter 5 Log Audio The XL2 logs audio data as a wav-file. Choose from the following settings: Off Audio logging is off On Audio logging is activated from measurement start to stop. Events Only 7 Audio logging of triggered events only. 8 For more details read the chapter Wav-File Recording.
Sound Level Meter 11 Trigger and Marker Monitor Answers the question: What caused the triggered event? Lvl Event automatically triggered by level. 1 Event triggered or marker added by pressing key 1 of the XL2 Input Keypad. 2 Event triggered or marker added by pressing key 2 of the XL2 Input Keypad. 3 Event triggered or marker added by pressing key 3 of the XL2 Input Keypad. 4 Event triggered or marker added by pressing key 4 of the XL2 Input Keypad. 12 Stop Duration See 3 .
Sound Level Meter How to Setup the XL2 for Triggered Event Measurements • Select the logging page, set Logging On, Interval dt: 00:00:01 and choose the required log values. • Setup the event page. For example, the screenshot below starts the event recording after LAF exceeds 80 dB for 2 seconds and stops after LAF is lower than 70 dB for 3 seconds. Logging Enabled Triggered-event recording requires the activation of sound level logging. Using the default Interval dt: 1 second is recommended.
Sound Level Meter Limits 1 The limit page offers two functions: • Setup of limit LED function; enabling the XL2 to highlight any sound levels that exceed the pre-set limit in orange or red color. The default color is green. • Limit parameter setup for external Digital I/O Adapter, which connects to the digital I/O interface. The Digital I/O Adapter is an optional accessory for the XL2 analyzer.
Sound Level Meter 5 I/O - Level 1 Setup the level for the control of e.g. the external Digital I/O Adapter Box. • Select the level field with the rotary wheel . • Press enter and select the level for the control of the external Digital I/O Adapter Box.. 6 Selected Sound Level Values To set the level values for the control of the external Digital I/O Box. • Select the Out 1, Out 2, Out 3 or Out 4 level with the rotary wheel and press enter .
Sound Level Meter Correction Value KSET The correction value page offers a measurement wizard for live event monitoring, applicable in case the measurement location differs from the loudest position in the live event area. Measurement Position The goal at live event monitoring is to measure the sound level at the loudest position accessible by the audience. Setting up any sound level measurement at this loudest location is typically not practical, thus an alternative measurement position is chosen.
Sound Level Meter How to Measure the Correction Value • Play a pink noise signal at the typical sound pressure level of the live event. (signal source Minirator, NTi Audio Test CD) • Select the correction page . • Search the audience area for the location with the highest sound pressure level and position the XL2 Analyzer. • Turn the rotary wheel to select the parameter RUN next to Audience and press enter . 60 • Wait until the measurement is completed. • Position the XL2 at the measurement position.
Sound Level Meter • Wait until the measurement is completed. • The correction values k1 and k2 are calculated and displayed including date and time (in accordance with DIN15905). Manual Setting of Correction Values You may fine-tune the correction values k1 and k2 manually. Such fine-tuning adds the remark “Manually Adjusted” in the log file. 3 1 • Turn the rotary wheel and press enter . 2 to select the correction value 3 The selected correction value starts flashing.
Sound Level Meter • Set the correction value with the rotary wheel The note “Manually Adjusted” is displayed at . 2 • To undo the manual setting turn the rotary wheel the parameter UNDO at 2 . • Confirm with enter . . to select Reset Correction Values You may clear all correction values back to zero by pressing the Clear All 1 and confirm with enter .
Sound Level Meter 63
FFT Analysis + Tolerance 5. Acoustic Analyzer FFT Analysis + Tolerance Besides the comprehensive sound level meter function, the XL2 Audio and Acoustic Analyzer offers the following acoustic measurement functions: The FFT measurement is the ideal tool for visualization of comb filters and narrow band effects. It allows a detailed frequency response investigation of audio and acoustic systems. The XL2 includes an extremely fast, real-time FFT. Optional features are • High-resolution Zoom-FFT up to 0.
FFT Analysis + Tolerance 1 14 13 12 Result Symbols / Capture & Start Tolerance Mode This field offers two functions: • Symbols for measurement results 2 Upper result displayed as line. Lower result displayed as bargraph. 11 1 10 2 • Capture & Start Tolerance Mode The displayed readings may be captured as reference reading C1 to C8 for • Comparing measurement results against captured traces with relative or absolute curve display.
FFT Analysis + Tolerance Manage captures Allows to rename captures, clear recorded captures, save captures to SDCard for export from the XL2 or load captures from SD-Card for import to the XL2. Start tolerance Starts the tolerance mode for passed/ mode failed measurements comparing the actual measurement results against a tolerance band. 2 Measurement Result Actual level result of the indicated frequency band.
FFT Analysis + Tolerance 6 7 Time Weighting Offers selectable time weighting of 0.1, 0.2, 0.5, 1.0 second as well FAST (125 ms) and SLOW (1 second). Applications: Short Time Weighting High resolution in time with minimum averaging Long Time Weighting Low resolution in time with longer averaging Run Indication The run indication shows the measurement status running, paused or stopped.
FFT Analysis + Tolerance 10 Readout Frequency You may select any frequency to read out individual levels. The selected frequency is indicated by the cursor arrow. Choose between the following settings: 11 • • • • Select the readout frequency 10 and press enter . The zoom mode is displayed above the flashing arrow. Select the zoom-in frequency with the rotary wheel . Press limit and zoom the linear frequency scale in or out with the rotary wheel .
FFT Analysis + Tolerance 13 Measurement Unit Select the measurement unit as follows: dB Sound level in dBSPL This measurement unit is permanently selected upon connecting a NTi Audio measurement microphone with electronic data sheet. dBu Input level in dBu dBV Input level in dBV V Input level in Volt 14 Page Selector X-Scale and Parameter Setting 20k Shows FFT result of the frequency range. 484.38 Hz - 20.594 kHz in a resolution of 141.62 Hz with 142 bins shown on the display.
FFT Analysis + Tolerance FFT Analysis - Getting Started Test Preparations • Connect the measurement microphone to the XL2. • Switch on the XL2 . Configuration The XL2 displays two different sound pressure levels at the same time. You configure to display either the levels Live, Max, Min, EQ or captured results. • Select the upper result parameter with the rotary wheel The 48V phantom power indication in the upper menu bar changes to ASD. The XL2 is ready for acoustic measurements.
FFT Analysis + Tolerance Select Upper/Lower Reading The pop-up window Select reading shows up. The pop-up window Select reading mode shows up. • Select the integrated averaged reading EQ. All available selections are Z-weighted (= no weighting). • Select EQ for normal absolute display of measurements. • Follow the same instruction and select the lower FFT reading Live. • Confirm with enter . Press start to measure and display the sound levels results indicated with ----.
FFT Analysis + Tolerance Select Input Range • Select the lowest possible input range according to the maximum level expected during the measurement. • Select the input range RNGE and press enter . • Turn the rotary wheel to set the applicable input range and confirm with enter . Start and Stop the Measurement • The XL2 measures the selected sound pressure levels Live and EQ. All available sound levels are Z-weighted (= no weighting). • Press start . The run indication switches to running .
FFT Analysis + Tolerance Save the FFT Measurement Result • Select the memory menu with the rotary wheel confirm with enter . and The memory menu opens. Capture References and Create Tolerances The Spectral Limits Option extends the function range of the XL2 with trace capturing, relative curve display and comprehensive tolerance handling for the FFT Analysis and the high resolution 1/12 Oct + Tol spectral analysis.
Reverberation Time RT60 Reverberation Time RT60 The XL2 measures the energy decay from 63 Hz to 8 kHz using the Schroeder method in 1/1 octave resolution. The optional Extended Acoustic Pack enables 1/3 octave band resolution from 50 Hz to 10 kHz. Use either an impulse source (e.g., a starter pistol) or a gated pink noise as the test signal.
Reverberation Time RT60 RT60 Run Test Page RT60 Result Page 11 10 17 9 1 8 16 12 13 7 14 6 15 5 2 4 3 75
Reverberation Time RT60 1 RT60 Cycle Result Page Set Level Markers Prior to conducting a reverberation time measurement, the environmental noise is measured, and the required energy level of the test signal is determined. • Select SET and press enter vironmental noise. 21 20 to measure the actual en- The required level markers appear in grey color. 2 Input Range Select between the lower, mid and upper input range.
Reverberation Time RT60 4 Measurement Status STAT Displays the actual measurement status. Start and stop the reverberation time measurement with start/stop . The following status information is displayed: ARMED 5 Measurement is waiting for the test signal to exceed at least one measurement trigger marker, then the measurement is triggered automatically. NOISE A sound stimulus signal above the trigger marker is being received. DECAY Decay is being measured.
Reverberation Time RT60 10 Phantom Power Supply 48V The XL2 provides 48 V phantom power supply to the connection microphone or sensor. ASD An NTi Audio measurement microphone with automated sensor detection ASD is connected. The XL2 reads the electronic data sheet of the microphone and switches the 48V phantom power automatically on 11 Page Selector RT60 Select between the RT60 run test page and the result page. The page button toggles between these displays.
Reverberation Time RT60 13 14 Uncertainty Factor The uncertainty factor is displayed in the RT60 average result page. It indicates the uncertainty of the averaged measurement results, reduces as more cycles are measured, and depends on the measured reverberation time and the bandwidth of the individual frequency band; lower bands show a higher uncertainty factor. The number of measurement cycles is displayed at 5 .
Reverberation Time RT60 18 19 Correlation Factor in % The correlation factor is 100% for perfectly linear sound pressure level decay after the sound source has ceased. The natural deviation from this linearity results in lower correlation values. The correlation factor is typically 80 100%. Cycle Reverberation Time Test Result Readout of cycle reverberation time and correlation factor 18 when selection 17 is CYC xx or Last. Correlation Factor. Scale is on the right Y-axis. For more details see 18 .
Reverberation Time RT60 RT60 Measurement - Getting Started Test Signal: Pink Noise Play a pink noise signal through an omni-directional speaker in the room under test. The sound source should be played for a long enough time period to ensure that a balance between injected and absorbed acoustic energy has been reached. For example the sound reflections should be given enough time to reach all reflective surfaces in the room.
Reverberation Time RT60 Set Level Markers • Select the parameter SET with the rotary wheel press enter . 82 and The environmental noise is measured and the grey level markers are set. Get Ready for the Reverberation Time Measurement • Protect the ears against high sound pressure levels, as the test signals might be very loud. Setting the pink noise level: • Start the pink noise test signal with the appropriate on/off time according to the room. Use an initial low level.
Reverberation Time RT60 Start the Measurement • Press start . The status indication switches to ARMED. • Enable the test signal; e.g., switch on the gated pink noise signal or fire a starter pistol. • The black bars have to exceed the grey bars completely. Continue the Measurement Using pink noise: The gated pink noise test signal continues with the preset on/ off time. The XL2 automatically triggers at each cycle. Complete a minimum of three test cycles to accurately calculate the uncertainty factor.
Reverberation Time RT60 Stop the Measurement and Read Out the Result • Press stop after all cycles are completed. • If applicable, switch off the pink noise test signal. • Select the result page RES with page . Read Out the Individual Cycle Result • Select CYC with the rotary wheel , press enter and select the individual cycle result with the rotary wheel . Within each cycle, the reverberation time for each frequency band is displayed in seconds and the correlation factor in %.
Reverberation Time RT60 Error Indications Various error indications are displayed for unsuccessful RT60 measurements. Corrupt cycles can be deleted individually. These results are then excluded from the average calculations. • LOW LEVL This is the abbreviation of “low test signal level” during the measurement. Increase the test signal level until the black level markers exceed the grey level markers in every frequency band.
Polarity Polarity Positive/Negative Result Page Polarity measurement is important in matching the left and right speakers for a good stereo sound image. The polarity function measures the polarity of cables, single speakers and speaker cabinets. For testing, use the polarity signal provided on the NTi Audio Test CD or the Minirator test signal generator. 4 The polarity of individual speakers or speaker cabinets might change with the frequency.
Polarity Detailed Result Page 1 5 10 6 Input Selection Select the signal source as follows: • Select Signal Source with the rotary wheel • Press enter to select either Voice Note Mic Use the internal voice note microphone of the XL2 for polarity measurements. This selection disables the rear speaker. XLR Input Measure the acoustic polarity with a measurement microphone. Alternatively, measure the polarity of an electrical signal connected with an XLR audio cable.
Polarity 4 Balance Indicator Indication of the audio signal balance between pin 2 and 3 on the XLR input for input signals > -34 dBu. 7 X-Axis Seven octave bands with center frequencies from 125 Hz to 8 kHz. SUB displays the polarity of Sub-woofers; frequency range < 100 Hz. 8 Relative Level Indicator The grey area shows the measured signal energy within the individual frequency bands. The bands with the biggest energy have the most effect on the actual displayed POSITIVE / NEGATIVE polarity result.
Polarity Polarity Measurement - Getting Started For acoustic polarity measurement you can use the internal voice note microphone, or an external measurement microphone, plugged into the XLR input. The polarity result for left and right speaker cabinets should match for a good stereo sound image. • Feed the speaker cabinet with the polarity test signal of the Minirator. • Adjust the test level (at Minirator or amplifier) until the test signal is clearly heard.
Delay Time Delay Time 1 The delay time measurement function is suitable for accurate configuration of delay line setups, by optimizing the directionality of the signal source. The XL2 measures the delay time between the reference signal and the acoustic signal from the speaker. The acoustic delay settings are displayed, allowing you to easily set the measured delay time into the delay device in the rack.
Delay Time 4 Calculated Distance Distance from measurement position to speaker in meters or feet, based on the defined temperature in °C or °F 5 Synchronization Time Bar The automated synchronization allows delay time measurements without any connected electrical reference signal for 100 seconds using the NTi Audio Test CD or 300 seconds using the Minirator, MR2 or MR-PRO. It displays the time remaining until the next required synchronization.
Delay Time Delay Measurement - Getting Started The delay time measurement is conducted between the synchronized electrical input signal and the acoustic signal measured by the built-in voice note microphone. In this example, the delay between speakers A and B in the illustrated auditorium is measured.
Delay Time • Wait until the XL2 synchronizes to the incoming delay test signal, then the synchronization time bar fills up. • Disconnect the audio cable, with the synchronizing signal, from the XL2, allowing you to move around freely for the delay measurement. When selecting Minirator as the delay signal source, the XL2 has to be synchronized to the signal source again after 5 minutes.
Delay Time Store Reference • Select the displayed 0.0 ms below Act. Delay with the rotary wheel and press enter . The reference result of speaker A is stored for the difference calculation of delay A - B. Measure Sub Speaker B • Start the delay test signal at speaker B. Mute speaker A. • Position yourself with the XL2 at the shown measurement position. The XL2 uses the VoiceNote microphone for the delay test; do not connect any measurement microphone. • Stop the delay test signal at speaker A.
Delay Time Automated Difference Calculation • The delay time difference between speaker A and B is automatically calculated and shown below the Act. Delay result. The delay time is measured. Delay Test utilizes VoiceNote Microphone The XL2 uses the internal VoiceNote microphone to measure the acoustic delay. Do not connect any measurement microphone to the XL2 for the delay time measurement. Measurement Position Do not position the XL2 too close to reflecting surfaces, such as walls or floors.
1/12 Octave + Tolerance 1/12 Octave + Tolerance (optional) The Spectral Limits Option extends the XL2 function range with an RTA analyzer with spectral resolutions from 1/1 octave down to 1/12th octave. Trace capturing, relative curve display and comprehensive tolerance handling are supported in the FFT Analysis and the high resolution 1/12 Oct + Tol spectral analysis.
1/12 Octave + Tolerance 1 14 Result Symbols / Capture & Start Tolerance Mode This field offers two functions: • Symbols for measurement results 2 13 Upper parameter displayed as line. 12 1 Lower parameter displayed as bargraph. 11 2 3 10 4 9 • Capture & Start Tolerance Mode The displayed spectral readings may be captured in C1 - C8 for • Comparing measurement results against captures with relative or absolute curve display.
1/12 Octave + Tolerance Manage captures Allows to rename captures, clear recorded captures, save captures to SDCard for export from the XL2 or load captures from SD-Card for import to the XL2. Start tolerance Starts the tolerance mode for passed/ mode failed measurements comparing the actual measurement results against a tolerance band. 2 Measurement Result Actual level result of the indicated frequency band.
1/12 Octave + Tolerance 5 Input Range The XL2 Analyzer provides three input ranges to accommodate the wide range of input signals. The individual ranges are based on the microphone sensitivity setting in the calibration menu of the XL2. For example at a sensitivity S=20mV/Pa the input ranges are • Lower range: 10 - 110 dBSPL • Middle range: 30 - 130 dBSPL • Upper range: 50 - 150 dBSPL Select the lowest possible input range according to the maximum level expected during the measurement; e.g.
1/12 Octave + Tolerance 9 Preset Measurement Time Adjustment of preset measurement time for single timer setting. 10 Broadband Results User-selectable display of broadband results: • You may readout any individual frequency. • Return to auto frequency with enter . Z Broadband sound pressure level without any frequency weighting The cursor read out may be set manually to any frequency band or wideband level. The read out remains at the selected frequency.
1/12 Octave + Tolerance 13 14 Phantom Power Supply 48V The XL2 provides 48 V phantom power supply to the microphone or sensor. ASD An NTi Audio measurement microphone with automated sensor detection ASD is connected. The XL2 reads the electronic data sheet of the microphone and switches the 48V phantom power automatically on. 48V Phantom power is switched off. Band Listening The selected frequency band of the input signal is audible at the rear speaker or headphone output.
1/12 Octave + Tolerance 1/12 Octave - Getting Started Test Preparations The XL2 reads the electronic data sheet of any connected ASD microphones provided by NTi Audio and switches the 48V phantom power automatically on as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2 . Configuration The XL2 displays two different sound pressure levels at the same time. You configure to display either the levels Live, Max, Min, EQ or captured results.
1/12 Octave + Tolerance Select Upper/Lower Reading The pop-up window Select reading shows up. The pop-up window Select reading mode shows up. • Select the time-averaged sound level EQ. All available selections are Z-weighted (= no weighting). • Select EQ for normal absolute display of measurements. • Follow the same instruction and select the lower spectral reading Live. • Confirm with enter . Press start to measure and display the sound levels results indicated with ----.
1/12 Octave + Tolerance Select Input Range Select the lowest possible input range according to the maximum level expected during the measurement. • Select the input range RNGE and press enter . • Turn the rotary wheel to set the applicable input range and confirm with enter . Start and Stop the Measurement • The XL2 measures the selected sound pressure levels Live and EQ. All available sound levels are Z-weighted (= no weighting). • Press start . The run indication switches to running .
1/12 Octave + Tolerance Save the Measurement Result • Select the memory menu with the rotary wheel confirm with enter . and The memory menu opens. Capture References and Create Tolerances The Spectral Limits Option extends the function range of the XL2 with trace capturing, relative curve display and comprehensive tolerance handling for the FFT Analysis and the high resolution 1/12 Oct + Tol spectral analysis.
Noise Curves Noise Curves (optional) The Spectral Limits Option extends the XL2 with the Noise Curves measurement function. A noise curve may be used to characterize room noise or other environments. Various standardized international noise curves are the most widely used means for evaluating background sound in buildings, and other facilities such as transit facilities, as well as in other indoor/ outdoor spaces. Residual noise in buildings may be generated from both environmental sources (e.g.
Noise Curves Room Noise Criteria RNC (in accordance with ANSI S12.2-2008) Room Criteria RC (in accordance with ANSI S12.2-1995) The RNC method is used to determine noise ratings when the noise from HVAC systems at low frequencies is high, and which is also suspected of containing sizeable fluctuations or surging. It essentially represents a rumble criterion.
Noise Curves Preferred Noise Criteria PNC (in accordance with ASA 1971) PNC curves represent a more stringent method based on an extension of the basic Noise Criteria system. They have been used in the past to judge the acceptability of ventilation and other background broadband noise.
Noise Curves RNC Information Page 1 Noise Curve Types • Noise Rating NR • Noise Criteria NC (2008) and (1995) • Room Noise Criteria RNC • Room Criteria RC (1995) • Preferred Noise Criteria PNC (1971) 13 Measurement Result The noise rating of a spectrum is designated as the value of the highest curve “touched” by the measured octave-band spectrum. The octave band in which this “touching” occurs is noted along with the curve designation.
Noise Curves 3 4 Y-Scale setting • Auto-Scroll • Zoom: -- Select the Y-Axis with the rotary wheel and confirm with enter . -- Select the zoom factor between 10, 5, 2.5 dB/div and confirm with enter . Noise Measurement Result Real-time spectrum in 1/1 octave band resolution. 5 Noise Floor The grey area shows the noise floor of the connected NTi Audio measurement microphone (provided by the electronic data sheet) in combination with the XL2 Analyzer. 6 X-Scale X-Scale from 16 Hz to 8 kHz.
Noise Curves 9 Actual Measurement Time Counts actual measurement time in hrs:min:sec. Supports time modes: continuous and single. Timer Mode Continuous (applicable for standard measurements) All values are recorded and monitored continuously after starting a measurement with start . The actual measurement time is shown. Timer Mode Single Automatically stops the measurement after the pre-set measurement time. • Set the required measurement time. • Start the measurement .
Noise Curves 12 SIL Measurement Result The speech interference level (SIL) result is shown at noise curve types NC-2008 and NC-1995 1 . It is calculated by averaging the octave-band sound pressure levels at 500 Hz, 1000 Hz, 2000 Hz and 4000 Hz. If the measured spectrum in any octave band does not exceed any of the octave bands of that NC(SIL) curve, the spectrum is designated NC(SIL).
Noise Curves Recommendations Type of Room Space Type Recommended NC and RNC Curve Equivalent Sound Level RC curve Conference rooms 25-35 35-44 25-35 (N) RC curve Recommended NC and RNC Curve Equivalent Sound Level Concert halls 15-18 - - Hospitals and clinics 25-45 35-52 25-40 (N) Small auditoriums 25-30 35-39 - Movie theaters 30-40 39-48 - Large auditoriums 20-25 30-35 - Churches 30-35 39-44 25-35 (N) Broadcast studios 15-25 16-35 - Courtrooms 30-35 39-44 25-35 (
Noise Curves Noise Curves - Getting Started Configuration • Select the noise curve type with the rotary wheel . Test Preparations The XL2 reads the electronic data sheet of any connected ASD microphones provided by NTi Audio and switches the 48V phantom power automatically on as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2 . The 48V phantom power indication in the upper menu bar changes to ASD. The XL2 is ready for acoustic measurements.
Noise Curves Start and Stop the Measurement • Press start . The run indication switches to running . The actual noise level LZeq of the selected octave band is displayed. The parameter RUN flashes in the memory menu. The Y-axis adjusts automatically according the measurement result. Save the Measurement Result • Select the memory menu with the rotary wheel confirm with enter . and The memory menu opens. • Press enter to store the test results or select Save Screenshot to generate a screenshot.
STIPA Speech Intelligibility STIPA (optional) The STIPA analyzer option allows reliable measurement of the speech transmission index within 15 seconds. Besides the single value STI or CIS test result, a detailed view of the modulation indices and individual band level results is provided. The STIPA analyzer meets the latest standard edition 4.0 IEC 60268-16, released in 2011. The XL2 Supports also noise corrections, automated averaging of measurements and the older standard editions 2.0 and 3.0.
STIPA STIPA Table Result Page STIPA Numeric Result Page 10 1 9 8 2 7 3 4 5 6 11 12 13 14 Use only the original NTi Audio test signal for speech intelligibility measurements with the XL2.
STIPA 1 Run Indication This icon displays the run status of the STIPA measurement. 2 Measurement Result • Single value speech transmission index result. • Repeatability of measurement result: Since a dedicated noise test signal is used, the STIPA result may deviate by maximum 0.03 STI (=Max-Min) at the same measurement position. 3 Sound Level LAeq Shows the time-averaged sound level of the 15 seconds STIPA measurement cycle time. 4 Sound Level LAS Actual sound pressure level.
STIPA 7 Measurement Unit The STIPA result is displayed in STI (Speech Transmission Index) or CIS (Common Intelligibility Scale), whereby CIS is calculated as CIS = 1 + log STI. 9 Progress Bar Measurement status indication; the single STIPA measurements takes 15 seconds. The actual measurement time and measurement status are indicated here. 8 Edition of Standard IEC60268-16 10 Page Selector Select between these pages: ed4.
STIPA 13 14 120 STIPA Modulation Index MF1, MF2 For good speech intelligibility it is mandatory that the integrity of the transmitted voice signal modulations are preserved. Therefore STIPA is based on measuring the MTF (Modulation Transfer Function). This function quantifies the degree to which the voice modulations are preserved in individual octave bands. STIPA determines the MTF by analyzing the seven frequency bands.
STIPA STIPA Measurement - Getting Started Test Preparations The XL2 reads the electronic data sheet of the connected NTi Audio measurement microphone and switches the 48V phantom power automatically on as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2 . Start STIPA Test Signal Select the STIPA signal source according your application requirements. • Switch on the STIPA test signal at the signal source.
STIPA Start STIPA Measurement • Press start . 122 The progress bar switches to RUNNING. The test result tendency is shown on the STIPA bargraph, marked with Bad, Poor, Fair, Good and Exlnt. Stop STIPA Measurement After the period of 15 seconds the STIPA measurement finishes automatically. The progress bar indications switches to FINISHED and the final STIPA test result is displayed. • Switch off the STIPA test signal.
STIPA Store STIPA Measurement Result • To store the test result, select the memory menu with the rotary wheel and press enter . • Select Save Test to store the test results or select Screenshot to store the screenshot. The speech intelligibility STIPA is measured and stored on the SD Card including sound pressure level and modulation indexes. Averaging of STIPA Results The standard IEC 60268-16 recommends averaging two or three subsequent results taken at the same measurement location.
STIPA Start Averaging Add Cycles • Select the averaging page Avr. • Press enter • Turn the rotary wheel to select the parameter START NEW and press enter . • Repeat the measurement at the same position as required. 124 The first STIPA measurement starts automatically. It is labeled Cyc 1. to confirm Add Cycle. The XL2 performs further STIPA measurements and adds them to the list.
STIPA Finish Display of STIPA Numeric Result Page • Choose Finish to end the averaging. The symbol played. indicates that the averaged STI value is dis- The STIPA average and the deviation is displayed for documentation.
STIPA STIPA with Ambient Noise Correction Measuring the speech intelligibility index under realistic environmental conditions is often not feasible; e.g., playing the test signal in a railway station at emergency levels during peak hours will irritate passengers. Additionally, at rush-hour the characteristics of ambient noise might be highly impulsive, while a pre-requisite for accurate STIPA measurements is a negligible impulsivity in the ambient noise.
STIPA Commissioning New PA-Systems New announcement systems are commissioned e.g. at public areas prior the grand opening. Thus the actual ambient noise caused by the public is not available yet during the STIPA measurement. Here you may simulate the real-life condition with ambient noise data enabled by one of the following modes: Measure Ambient Noise • Position the microphone at the STIPA measurement point. • Select Measure (without any test signal presence).
STIPA STIPA Measurement • Select the STIPA result page 123. • Perform the default STIPA measurement. STIPA Post-Processing In case no ambient noise correction has been carried out onsite with the XL2 Analyzer, then you may post process your measurement data on the PC. The NTi Audio STIPA Reporting Tool combines the STIPA measurement taken at quiet conditions and the actual ambient noise caused by the public, e.g. during day-time. This emulates the expected STIPA value at real-life conditions.
STIPA STIPA Measurement Hints Hints: Ambient Noise • The ambient noise has to be sufficiently static during the measurement. A signal-noise ratio of 15 dB or higher is recommended to achieve best speech intelligibility. Impulsive ambient noise during the measurement, such as speech, causes severe measurement errors. The STIPA result is usually too high. • Fluctuating noise is detected by measuring the direct STI in the absence of the test signal.
STIPA Hints: CD-Player • Only high-quality CD-Players should be used to reproduce the STIPA test signal as only limited time-shifts (+/- 20 ppm) ensure reliable STIPA test results. Pitch control and shock protection should be disabled. We recommend that only professional CD-Players be used. Verify the time shift of the CD-Player with a 1 kHz test signal: • Insert the NTi Audio Test CD into the CD-Player and start track 1, which is the 1 kHz test signal.
Audio Analyzer 6. Audio Analyzer RMS / THD+N The XL2 offers a comprehensive audio analyzer. Broadband or wideband measurements are offered by the measurement functions RMS/THD+N and Oscilloscope. The XL2 Audio and Acoustic Analyzer measures the parameters Level RMS, THD+N and frequency simultaneously.
Audio Analyzer 1 Filter Z-Weighting A-Weighting Frequency A-weighting according IEC 61672 for low noise levels. C-Weighting Frequency C-weighting according IEC 61672 for high noise levels. HP 100Hz Highpass 100 Hz, -200 dB/dec., maximally flat magnitude filter, e.g. -60 dB @ 50 Hz HP 400Hz Highpass 400 Hz, -120 dB/dec., maximally flat magnitude filter, attenuates 50/60Hz components of test signal HP 19k Highpass 19 kHz; e.g.
Audio Analyzer PreNotch Listening The input signal is audible at the rear speaker or headphone output. • Press and hold down the speaker button PostNotch Listening The main frequency component is filtered out by a notch filter, leaving only the remaining signal audible. . The pop-up window volume is displayed. • Press the speaker button ume window. • Additionally press enter to display the vol- The post notch listening with auto-gain function is activated. The maximum gain setting is 0 dB. e.
Audio Analyzer Oscilloscope The scope function visualizes the waveform of the electrical input signal. It automatically triggers to the fundamental frequency and selects the scaling of the X-axis (time) and Y-axis (level) accordingly. The fundamental, or most dominant, frequency of the input signals is displayed above the scope screen. The scope scaling is fixed.
Calibration 7. Calibration The XL2 Audio and Acoustic Analyzer meets or exceeds the specifications listed in the chapter Technical Data. Instrument Calibration In order to maintain the high accuracy, annual calibration of the XL2 Analyzer and the measurement microphone is recommended. The calibration service verifies the complete product specifications, differences to the last calibration and measures the frequency response of the measurement microphone.
Calibration 1 1 Phantom Power Supply 48V The XL2 provides 48 V phantom power supply to the connection microphone or sensor. ASD An NTi Audio measurement microphone with automated sensor detection ASD is connected. The XL2 reads the electronic data sheet of the microphone and switches the 48V phantom power automatically on 48V Phantom power is switched off. 2 3 4 5 6 136 2 Factory Sensitivity Factory sensitivity of measurement microphone in mV/Pa.
Calibration 5 6 Level Type LZF Default setting. LHP100F Suppressing any low frequency noise, for example wind during outdoor calibrations. Electronic Data Sheet of Measurement Microphone Read out data from the connected microphone. User Calibration - Manual Sensitivity Setting In case no external calibration device is available, set the sensitivity of non-NTi Audio microphones manually according to the product specifications as follows: • Select Sensitivity 2 with the rotary wheel .
Profiles 8. Profiles Profiles - Getting Started Profiles are templates of measurement setups. You may define which profile is loaded at startup, so that the measurements are carried out always with the same setup and instrument settings. Activate Profile Selection at Startup • Select Show profile list 1 in the System menu. • Press enter to activate Yes. This will show the profile list at startup. A remarkable advantage of the XL2 is the flexible user interface.
Profiles Preset Measurement Function Store MyFirstProfile • Start the XL2 Analyzer in Full mode. • Select the typically-used measurement function and adjust the measurement parameters according to the requirements. • Select Profile in the main menu and press enter . The profile menu opens.
Profiles • Select Manage and press enter . The Manage Profile menu opens. Each stored profile includes all settings of all measurement functions and pages. Only the following details are not stored: • Calibration settings • System settings • Temperature unit • Phantom power on/off 140 • Select Save Profile and press enter . The Save Profile menu opens. • Select Rename and press enter . • Set the profile name to MyFirstProfile. The maximum name length is 20 characters.
Profiles • Select Configure available screens and press enter . Select Profile at Startup • Switch on the XL2 • Select additional available pages/measurement functions for the profile; e.g., RTA . • Press escape to return to the Save Profile screen. • Set Append mode available: yes in order to have the append data feature available in the memory menu . • Select Save and press enter . MyFirstProfile is saved in the internal XL2 memory. The profile selection is shown on the display.
Profiles Select Profile during Operation • Select Profile in the main menu and press enter The profile menu opens. . Run Measurement The profile name is displayed when a measurement function is highlighted. The main menu offers only the measurement functions enabled by the profile, plus the calibration and profile menu. • Press start . • Choose Select and load the required profile. • Wait 10 seconds until the measurement is finished.
Profiles Export MyFirstProfile to PC If you have two or more XL2 Audio and Acoustic Analyzers, you may like to transfer the same profiles to the other instruments. • Select Profile in the main menu and press enter • Select Manage and press enter . • Select Export to SD-Card and press enter . . The XL2 generates a folder on the SD Card called “Profiles”. All available profiles are exported into this folder.
Profiles The XL2 can store up to 20 individual profiles in the internal system memory and offers three different profile types: Types Factory default profiles Description The XL2 includes factory default profiles, which are marked with “#” in the beginning of the file name. Sample filename: #DIN15905-5.prfs The factory default profiles are a free download for all registered XL2 customers on the support website at http://my.nti-audio.com. For details see the chapter My NTi Audio.
Capture + Tolerances 9. Spectral Limits Option (Capture + Tolerances) Capture the EQ Measurement Results • Select the Capture & Start Tolerance Mode symbol for capturing the measurement result. The Spectral Limits Option extends the function range of the XL2 with trace capturing, relative curve display and comprehensive tolerance handling for the FFT Analysis and the high resolution 1/12 Oct + Tol spectral analysis.
Capture + Tolerances A pop-up window shows up. • Select Capture EQ. • Confirm with enter . • Select C1. • Confirm with enter and set the capture name in the displayed letter selection box e.g. to Ref. 146 The pop-up window ... and store it to shows up. The capture has been stored in the internal XL2 memory.
Capture + Tolerances Edit Capture Manually • Select the Capture & Start Tolerance Mode symbol. • Confirm with enter . • Select Manage captures. • Confirm with enter . • Select Save to SD card. See the difference between Live Level and Capture • Blank the upper parameter by setting ----. • Select the lower parameter with the rotary wheel . • Confirm with enter . • Select Live and confirm with enter . The pop-up window Select reading mode shows up. The pop-up window Save captures shows up.
Capture + Tolerances The relative difference of the Live level compared to the captured reference is displayed. Start Tolerance Mode for Passed/Failed Measurements • Select the Capture & Start Tolerance Mode symbol with the rotary wheel . • Confirm with enter All levels differences (relative levels) are displayed in the unit dBr. 148 .
Capture + Tolerances A pop-up window shows up. • Select Start tolerance mode. • Confirm with enter . The pop-up window Make tolerance from shows up. • Select Ref to load the earlier captured reference spectrum. • Confirm with enter . You may press the page button to toggle between the date and spectral resolution data of the capture.
Capture + Tolerances Passed Result 1 The tolerance mode is active for passed/failed measurements. PASSED The passed/failed condition is further visualized by the bicolor “limit” button and forwarded to the I/O interface of the instrument in order to drive an external alarm device such the accessory SPL Stack Light. 2 1 150 3 PASSED / Failed Result The actual measurement result is within the tolerance band. The actual measurement result is outside of the tolerance band.
Capture + Tolerances Failed Result The XL2 Analyzer compares spectral measurements against a tolerance band and visualizes exceptions 1 in every frequency band. Exit Tolerance Mode • Select the Capture & Start Tolerance Mode symbol to exit from the tolerance mode. 1 Select another Tolerance File • Select the tolerance Ref with the rotary wheel . • Confirm with enter . • Select the new tolerance file from the SD Card or the internal XL2 memory. • Confirm with enter . • Select Exit tolerance mode.
Capture + Tolerances Advanced Start Functions You may start the passed/failed measurement by one of the following possibilities: • Press the XL2 start button . • Activate the automated level trigger in the tolerance file. • Activate the digital input 1 via the external I/O interface; e.g. a foot switch or a PLC control.
Capture + Tolerances • Store your individual tolerance file as txt-file in the XL2 folder “Tolerances”. • Start the XL2 tolerance mode and load the new tolerance file from the SD Card. #Unit dBr #Mode HighLow #Columns Frequency • All entries in the customized tolerance file need to be tab-separated. • The individual tolerance file entries may be in any order; no sequential order required.
Capture + Tolerances #Unit dBr (relative), fixed setting #ZTolerances Defines the tolerance band for the Z-weighted wideband level (not mandatory). #Mode Describes tolerance type; the XL2 allows setting of the tolerance type independently of the tolerance file. #Band Tolerances • Defines the tolerance band for the individual frequencies. • The ideal parameter can be set as “undef”. • The same frequency value on two successive rows defines a tolerance step, e.g.
Capture + Tolerances #Hide This parameter defines which tolerance freUnusedBands quency range is shown. (not mandatory) #nAllowed Violations #FreqScale Spacing Defines the frequency scale spacing in the Xaxis for the tolerance data. (not mandatory) True Measurement results of frequency bands without any specified tolerance are not displayed. lin Tolerance data displayed with linear frequency spacing, e.g. used in the FFT function.
Capture + Tolerances #AutoStartTrig- Sets the sound level in dBZ for an automated gerLevel level trigger; the passed/failed measurement starts as soon as the set level e.g. 95 dB is reached or exceeded. The actual input level can be monitored at the input range bar. (mandatory if #AutoStart is True used otherwise not mandatory) #AutoStartSet- Defines the settling time, after the auto start tlingTime trigger level is exceeded, until the start of the measurement; the time is set in 100 millisecond steps e.g.
System Settings 10. System Settings The various system settings of the instrument can be adjusted as follows: Turn the rotary wheel to navigate to the main menu 1 and select System. Confirm with enter . Display Contrast Setting • Hold down escape and turn the rotary wheel desired contrast is reached.
System Settings 4 Backlight Toggle the backlight with the power/backlight button The backlight offers three different conditions: • On • Dimmed • Off Auto On/Off The backlight switches off if no key is pressed for 2 minutes. Auto On/Dimmed The backlight dims if no key is pressed for 2 minutes. Manual The backlight can be toggled between On, Dimmed and Off. 5 . Set the real-time clock as follows: • Select the Date function 5 with the rotary wheel • Confirm with enter .
System Settings 7 Phantom Power You can select if the phantom power should be activated or disabled when the XL2 is powered up. Off Remember 8 9 The phantom power is switched off when the XL2 is powered up. Useful, for example, when it is common to measure lines. USB Mode The following setting defines how the PC recognizes the connected XL2: Ask on connect Select either the Mass storage or COM port mode after connecting the XL2 to the PC.
System Settings Information 11 11 Firmware Displays of the firmware version number 11 (to update the firmware to the latest version see the chapter Firmware Update of XL2. 12 Serial Number Displays the instrument’s serial number 12 13 13 12 . Options Displays the options installed on the XL2. Every installed option may be temporarily Hidden to generate a profile for other XL2s without this option installed. • Select the installed option. • Toggle with enter to set this parameter.
System Settings Scheduler 1 2 3 4 5 The XL2 Analyzer offers automated scheduled measurements without any human interaction. You may schedule a measurement for one or multiple days. XL2 Actions after pressing Start Schedule • Selects the preset measurement function. • Standby until start time • Starts measurement at start time • Stops measurement after the preset measurement duration • Stores measurement data to SD Card (no reconfirmation required) • Stops schedule or standby until next start time.
System Settings 1 2 Function Select the measurement functions for the scheduled measurements. Start Date and Time Set the date for the scheduled measurement(s): • Select Start with the rotary wheel . • Confirm with enter . • Set the date with the rotary wheel . • Confirm each setting with enter . Set the time for the scheduled measurement: • Select the T symbol to the right of the date with the rotary wheel . • Confirm with enter . • Set the time with the rotary wheel .
System Settings 7 Start Schedule Starts the scheduled measurement(s). The Scheduler active window is displayed. Scheduling - Getting Started After starting the scheduled measurement, the XL2 waits for the next scheduled start date and time. The instrument buttons are disabled. Power Supply It is recommended that the instrument remains powered on until the next start time, using the accessory mains power adapter.
Data Management 11. Data Management 1 Create New Project Folder Add a new folder with an individual project name. The maximum length of the project name is 16 characters. A fast way for creating new folder names is • Select an existing folder name with DIR • Select NEW • Rename the folder and confirm with start , thereby creating a new folder name. 2 Select Project Folder An overview of all existing project folders is shown. Select a folder to store the results of the measurements.
Data Management 5 Save Test Stores the measurement in the selected project folder. 6 Save Screenshot Stores the XL2 screen in the selected project folder. 7 Load Test Loads back previously stored result data from the SD Card for detailed examination on the instrument screen. 8 Append Mode The append mode stores one or more results into the same data file, simplifying data analysis and handling on the PC.
Data Management Memory Structure of SD Card 1 Measurement Data - Getting Started Enable Data Logging • Select the Log page in the sound level meter function and set the logging parameters; e.g., as follows: 2 3 1 Projects The folder Projects contains subfolders with the stored measurement results. The default subfolder name is “MyProject”. You can create further individual subfolders. 2 XL2.
Data Management Select Parameters for Measurement Report • Select the Rep page in the sound level meter function and set the parameters as follows: Complete the Measurement • Press page to return to the numeric result page. • Press start . The sound level measurement is now running. • Press stop to complete the sound level measurement. The memory question mark shows up in the upper menu bar after the completed measurement.
Data Management Open the Memory Menu • Select the memory menu confirm with enter . 168 and The memory menu opens with “Save Test” pre-selected. • Press enter Select File Name with the rotary wheel to confirm Save Test. The pop-up window Save Test shows up. • Select the user part of the file name. The maximum length of the user part is 12 characters.
Data Management Record Voice Notes Save Measurement Data Manually Voice notes are recorded speech annotations for each stored measurement. The XL2 utilizes the internal voice note microphone for the recording. • Select Record Voicenote and press enter . • Select SAVE and confirm with enter • Select REC and press enter . • Record the voice note and press enter The voice note has been recorded. to finish. .
Data Management Save Screenshot • Select the memory menu confirm with enter . with the rotary wheel The memory menu opens. • Select Save Screenshot and press enter . • Select the file name and confirm SAVE with enter 170 and The screenshot is saved to the SD Card. . Name + Save Measurement Data Automatically You may configure the XL2 to store results automatically to the SD Card upon completion of the measurement, by applying the Naming+Saving: auto function.
Data Management Measurement Data Logging: If the battery runs empty while you are measuring with logging and/or repeated-reporting enabled, the XL2 creates the folder RESTORE_AFTER_POWERFAIL and stores the measurement data up until the switch-off time. The next time you switch on the XL2, the following window informs you that this data exists. Click OK: View Project Folder on the PC • Connect the XL2 with the USB cable to the PC. The pop-up window USB Mode shows up.
Data Management The PC recognizes the XL2 as a mass storage device. The following SD Card content is shown: Overview of Measurement Data Files 1 2 3 4 5 6 7 • Open the folder “Projects” and the subfolder “MyProject”. If the XL2 is started with USB connection to PC, then the COM port mode is automatically activated for remote measurement or the XL2 Projector software. Therefore, if you want to access the data in the SD Card, then start the XL2 first and connect the USB cable to the PC afterwards.
Data Management 3 Measurement Report File Final report after the completed measurement. For more details please see the chapter Sound Level Meter: Reporting. 4 Wav-File The wav-file is the recorded audio file. The index “FS133.0dB(PK)” in file name represents the full scale peak level of the recorded wav-file. For more details please see the chapter Sound Level Meter: Wav-File Recording. 5 RTA Log File The XL2 logs the detailed real-time analyzer spectra in predefined time intervals.
Data Management Report File Format File name: e.g. MyTest_SLM_000_123_Report.txt Log File Format File name: e.g. MyTest_SLM_000_123_Log.txt XL2 Broadband Logging --------------------- MyProjects\MyTest_SLM_000_123_Log.txt XL2 Sound Level Meter Broadband Reporting ----------------------------------------- # Hardware Configuration XL2, SNo. A2A-02673-D1, FW2.20 Device Info: Mic Type: NTi Audio M4260, S/N: 1486, User calibrated 2011-04-05 13:56 Mic Sensitivity: 27.
Data Management Recall Measurements The straight-forward but powerful Load Test and Save Test functions serve the dual purpose of conveniently retrieving standard test setups for repeat testing and also of saving stored result data for later recall and examination on screen. Load Test • Select the memory menu confirm with enter . with the rotary wheel and The memory menu opens.
Data Management Select File Name • Select Load Test and confirm with enter View Measurement Data . The previously stored measurement data is displayed. The pop-up window Load Test shows up. 1 • Select the project folder and stored data file name with DIR. • Select LOAD, confirm with enter . The run indication 1 shows the pause symbol. You may continue with the measurements directly, e.g., choose the measurement function, setup parameters and press start .
Data Management Append Measurements The append mode stores the results of several individual measurements into the same data file, thus simplifying measurement result analysis and data handling on the PC. The following measurement functions support the append mode: • SLMeter, sound level meter • STIPA, speech intelligibility measurement Start the Append Mode • Select SLMeter and preselect the sound level LAeq. • Select the memory menu with the rotary wheel confirm with enter .
Data Management Select Filename • Select the user part of the file name. The maximum length of the user part is 12 characters. The right part “_SLM_001” is defined by the XL2 to avoid overwriting of existing measurements, whereby “SLM” is the appendix for the measurement function and “001” is an automatically-incrementing number. • Select START and confirm with enter . 178 The append mode is available. Take Measurement Results • Measure the sound level LAeq on the first position.
Data Management Store Measurement Results The pop-up window Append Data shows up. • Select the location ID and measurement ID, thus each measurement result is stored with an individual description for later documentation. • Select Append with the rotary wheel and confirm with enter . Append Further Measurement Results • Move to the next location in the room, carry out the measurement and follow the described append data procedure. Exit Append Mode • Open the memory menu .
Data Management Append After Power Up You can continue to add measurement results into the same data file at any time later. Recall Previous Measurements for Append Any previously stored measurement with the remark for append can be recalled and further test records appended. • Store the measurements in the append mode and switch the XL2 off and on again . • Select Load Test and press enter . • Select the project folder and stored data file name. • Select LOAD confirm with enter .
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XL2 Data Explorer 12. XL2 Data Explorer (optional) XL2 Data Explorer is a PC-based software application with a powerful data processor for easy and fast analysis of sound level measurement data. It is dedicated to acoustic consultants and noise measurement professionals. XL2 Data Explorer provides a convenient way to view, analyze and manage data and quickly creates customized reports.
XL2 Data Explorer 183
XL2 Projector 13. XL2 Projector Software The XL2 Projector displays the XL2 screen in real-time on your PC when connected by USB. The software toolbar enables control of the XL2 Audio and Acoustic Analyzer with the mouse and keyboard. XL2 Projector software is a free download for all registered XL2 customers on the support website at http://my.nti-audio.com. The XL2 Projector background color synchronizes with the XL2 limit button color .
XL2 Projector • Select COM port on the XL2. Microsoft Windows may recognize the new hardware automatically and start the hardware installation assistant. • If prompted, select “No connection to Windows Update” and continue with the installation. • Complete the installation. XL2 Projector displays the instrument screen in real-time. Features • The upper window bar displays the XL2 serial number. • The menu bar supports remote instrument operation of the XL2 Analyzer from your PC.
Remote Measurement 14. Monitoring Network 15. Remote Measurement Multiple XL2 Analyzers connect with USB Device Servers to a network for online monitoring of noise or other signals. An instance of the Projector Software may be started for each XL2 Analyzer, with all XL2 screens being simultaneously displayed on the PC monitor. The Projector Software offers the control of each XL2 Analyzer from your PC. The XL2 Analyzer offers an optional remote measurement function.
Microphones 16.Microphones NTi Audio Microphone Overview M2230 M2211 M2215 M4260 MA220 PreAmplifier Certified Class 1 measurement microphone according to IEC 61672. Metal diaphragm. General purpose measurement microphone. Class 1 frequency response. Metal diaphragm. Measurement microphone for high sound levels (up to 153 dB). Class 1 frequency response. Metal diaphragm.
Microphones Screen connection used for ASD technology 2 2 XLR M Pin 2 + Pin 3 Pin 1 Shield 3 3 Integrated Preamplifier The microphone bodies contain a preamplifier and require 48 VDC phantom power supply for operation. They combine high dynamic range and wide frequency range with low noise. The measurement microphones can also be connected to the XL2 Audio and Acoustic Analyzer using an ASD Cable for measurements at remote locations or for reduction of acoustic reflections.
Microphones Microphone plugs directly into the XL2 The XL2 automatically reads the electronic data sheet of the connected microphone as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2. Microphone Connection via a professional Audio Cable For distances longer than 20 meter (= 65 feet) use a high quality, low capacitance standard professional audio cable. The microphone sensitivity has to be entered manually into the XL2 Analyzer.
Further Information 17. Further Information My NTi Audio Register your instruments at My NTi Audio and benefit from the following possibilities: • • • • • • • Free updates for your instruments Activation of optional product functions Premium access to downloads Receive application and product news Faster worldwide support Tracing support in case of loss or theft Calibration support 190 How to Register • Open the web page “http://my.nti-audio.com”.
Further Information Tips and Troubleshooting Overview • Resetting to Factory Default • XL2 Starts Up with Limited Functions • Can I use another SD Card? • Formatting the SD Card • SD Card Errors • Error messages on display • Stored Data or Wav-files not available on SD Card Resetting to Factory Default If the XL2 Audio and Acoustic Analyzer reacts unexpectedly, a reset to the factory settings might solve the problem. • Switch off the XL2 • Hold down escape .
Further Information SD Card Errors The XL2 Audio and Acoustic Analyzer writes measurement data automatically onto the SD Card during ongoing measurements, thus a functioning SD Card has to be inserted at all times. Error Messages Missing SD-Card Actions to do Insert the SD Card. SD-Card is not FAT Format the SD Card on the PC. Follow formatted the instructions at Formatting the SC Card in this chapter. SD-Card is full The memory of the SD Card is full. Download all data to the PC and empty the SD Card.
Further Information Firmware Update You will find information about the installed firmware version in the systems settings of the instrument. The firmware revision history is listed on the XL2 Support Page http://my.nti-audio.com. Updating the firmware on the XL2 is executed by placing the XL2Vxxx.xx file in the root directory of the XL2. When started, the XL2 automatically completes the firmware update. 1 1 XL2.
Further Information Options and Accessories The System menu shows the installed options on the XL2. The following options extend the measurement functions of the XL2: Speech Intelligibility STIPA NTi Audio #: 600 000 338 The XL2 Analyzer measures the speech intelligibility according to the latest revision of standard IEC 60268-16:2011 (edition 4) and older editions. It includes ambient noise correction and automated averaging of measurements.
Further Information Remote Measurement Option NTi Audio #: 600 000 375 Spectral Limits Option NTi Audio #: 600 000 376 The Remote Measurement Option allows querying of the XL2 measurement data online via the USB interface. Thus customers may program their own measurement application on the computer, e.g. for sound level monitoring or automated measurement tasks.
Further Information Type Approval Option NTi Audio #: 600 000 377 XL2 Data Explorer Option NTi Audio #: 600 000 430 The Type Approval Option upgrades the instrument to the XL2-TA, the sound level meter dedicated to certified measurements. The XL2-TA with the M2230 microphone forms a type approved sound level meter offering class 1 performance in accordance with IEC61672 and type 1 in accordance with ANSI S1.4.
Further Information Cinema Meter Option NTi Audio #: 600 000 379 The Cinema Meter Option forms the dedicated solution for efficient calibration and repetitive verification of cinema loudspeaker systems according SMPTE ST 202:2010 and SMPTE RP 200:2012. An interactive assistant guides the user through dedicated measurement procedures. • Create new cinema Generates measurement templates according the cinema size with dedicated X-curve selection.
Further Information Installation of Options 1. 3. 2. PC Power On XL2 Mass storage 6. 5. 4. 1. Open XL2-TA.htm 198 Activate option Login (http://my.nti-audio.
Further Information 8. 7. Insert License number Get Activation Key 9. 10. Download activation file and copy to XL2 (xx_0xxxx.
Further Information Accessories Calibration Certificate Manufacturer Calibration Certificate The calibration certificate lists the individual product data with serial number. The calibration and adjustment procedures follow the documentation and traceability requirements of the EN ISO / IEC 17025 standard. Annual re-calibration of the instrument is recommended ensuring accurate measurements. NTi Audio # 600 000 018 Ever-ready Pouch The Ever-ready Pouch protects the XL2 during transport and operation.
Further Information ASD Cable The ASD Cable allows for extended connections of the NTi Audio measurement microphones. It supports the transfer of the electronic data sheet from the microphone to the XL2 Analyzer. You may chain up to 4x ASD Cables together in tandem. Length = 5 meter (16 feet) NTi Audio #: 600 000 336 Exel System Case This compact system case provides the professional transport protection for work in the field. It offers space for the handheld instruments, cables and connectors.
Further Information Stack Light with I/O Adapter Box The XL2 Audio and Acoustic Analyzer controls the external Stack Light via the Digital I/O Adapter Box. The light has three lamp sections, colored green, orange and red. Applications: • Sound level monitoring at live events or clubs The Stack Light shows orange for sound levels near the limit and red at levels exceeding the limits.
Further Information XL2 Data Explorer Software XL2 Data Explorer is a PC-based software application with a powerful data processor for easy and fast analysis of sound level measurement data. The data import requires the Data Explorer Option installed on the XL2. Download the software at the XL2 Support Page http://my.nti-audio.com. 89.4 dBA 85.3 dBLeq XL2 Projector Software The XL2 Projector displays the XL2 screen in real-time on your PC when connected by USB.
Further Information 4 GB SD Card (default) 1x included with XL2 NTi Audio #: 600 000 374 16 GB SD Card Individually tested high performance card for data storage. NTi Audio #: 600 000 385 32 GB SD Card Individually tested high performance card for data storage. NTi Audio #: 600 000 386 Warranty Conditions International warranty NTi Audio guarantees the function of its products and the individual components for a period of one year from the date of sale.
Further Information Calibration Certificate Service and Repairs Your NTi Audio instrument has been carefully tested during production and corresponds to the specifications listed in “Technical Data”. Calibration certificates for new products are optional. If your product is not functioning correctly or is damaged, please contact the local NTi Audio partner for assistance. If the product needs to be returned for service, kindly follow the service guidelines at www.nti-audio.com/service.
Further Information Declaration of Conformity Information for Disposal and Recycling CE / FCC Compliance Statement We, the manufacturer NTi Audio AG Im alten Riet 102, 9494 Schaan Liechtenstein, Europe do hereby declare that the XL2 Analyzer, the measurement microphones M2230, M2211, M2215, M4260, the preamplifier MA220 and accessories, comply with the following standards or other standard documents: • EMC: 2004/108/EG • Harmonized standards: EN 61326-1 • Explosive atmospheres (ATEX): 94/9
Specifications 18. Technical Data XL2 Conforms with Standards ••IEC 61672, IEC 60651, IEC 60804, IEC 61260 class 0, ISO 2969 ••China: GB/T 3785:2010, GB/T 3241, GB 3096-2008, GB 50526, GB-T_4959-1995 ••Germany: DIN 15905-5, DIN 45645-2, optional: DIN 45645-1 ••Japan: JIS C1509-1:2005, JIS C 1513 class 1, JIS C 1514 class 0 ••Switzerland: SLV ••US: ANSI S1.4, ANSI S1.43, ANSI S1.11-2004 class 1 ••International IEC standards are adopted as European standards and the letters IEC are replaced by EN.
Specifications Stabilization Time < 10 seconds Integration Time ••Minimum: 1 second ••Maximum: 100 hours minus 1 second Display Measurement Ranges Three level ranges depending on the microphone sensitivity with manual setting.
Specifications Measurements ••SPL actual, Leq, Lmin, Lmax, LCpeak ••Gliding LAeq with selectable time window from five seconds to one hour ••All measurement results simultaneously available ••Correction value measurement wizard ••Noise exposure level LEX with post-processing ••Logging all data or subsets in selectable intervals ••Recording of wav-files (ADPCM), a new wav-file starts every 12 hours (max.
Specifications Functions of Spectral Limits Option (optional) 210 ••SLMeter/RTA function »»True peak level in 1/1 and 1/3 octave resolution ••FFT function »»High-resolution Zoom-FFT with selectable frequency ranges and resolution up to 0.
Specifications Polarity Noise Curves ••Checks polarity of speakers and line signals ••Positive/Negative detection of wideband and individual 1/1 octave bands through internal microphone or XLR/RCA connector ••Test signal: NTi Audio polarity test signal generated by the MR-PRO, MR2 or the included NTi Audio Test CD ••Noise Rating NR in accordance with ISO 1996 ••Noise Criteria NC in accordance with ANSI S12.2-2008 and -1995 ••Room Noise Criteria RNC in accordance with ANSI S12.
Specifications Audio Analyzer Level RMS ••True RMS detection in V, dBu, dBV and dBSPL ••Range XLR/RCA input: 2 µV - 25 V (-112 dBu to +30 dBu) ••Accuracy: ± 0.5 % @ 1 kHz, ••Flatness: ± 0.1 dB @ 12 Hz to 21.3 kHz ••Bandwidth (-3 dB): 5 Hz to 23.
Specifications Power Supply ••Rechargeable Li-Po battery included »»Type 3.7 V / 2260 mAh »»Typical battery lifetime > 4 hours »»Range: 3.3 - 4.5 VDC ••Dry cell batteries type AA, 4 x 1.5 V »»Typical battery lifetime > 4 hours »»Range: 3.7 - 6.0 VDC ••Linear external power supply 9 VDC »»Range: 7.5 - 23.
Specifications 19. Technical Data Microphones M2230 Class 1 Certified Microphone Type Classification according IEC 61672 and ANSI S1.4 M2211 Frequency Response Class 1 Class 1 / Type 1 Certified Frequency Response Class 1 / Type 1 1/4” permanently installed MA220 - ±1 dB @ 5 Hz - 20 Hz ±1 dB @ 20 Hz - 4 kHz ±1.5 dB @ 4 kHz - 10 kHz ±2 dB @ 10 kHz - 16 kHz ±3 dB @ 16 kHz - 20 kHz +1/-4.5 dB @ 5 Hz - 20 Hz ±1.5 dB @ 20 Hz - 4 kHz ±3 dB @ 4 kHz - 10 kHz ±4.
Specifications M2230 Class 1 Certified Pressure Coefficient -0.005 dB / kPa Influence of Humidity (non-condensing) -0.02 dB / kPa -0.04 dB / kPa < ±0.4 dB > 250 years / dB - NTi Audio ASD in accordance with IEEE P1451.4 V1.0, Class 2, Template 27 Output Impedance 100 Ohm balanced Power Supply 48 VDC phantom power, 3 mA typical Connector Balanced 3-pole XLR Diameter Dimensions 20.5 mm (0.8”) 154 mm (6.
Specifications Typical Frequency Response of Measurement Microphones M4260 M2230, M2211, M2210, M2215 8 Tolerance Class 1, IEC61672-1 6 Sensitivity relative [dB] 4 2 0 -2 -4 Tolerance Class 2, IEC61672-1 -6 -8 5 10 10 20 100 100 log frequency [Hz] 1000 1000 (free field conditions @ reference direction 0°) 216 10000 10000 20000
Specifications Linear Measurement Range acc. IEC61672 / ANSI S1.4 (typ.
Specifications Free Field - Pressure Field Correction Factors 218 Nominal Frequency [Hz] M2230 Microphone [dB] M2211 Microphone [dB] M2215 Microphone [dB] 50 63 80 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 100 125 160 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 200 250 315 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 400 500 630 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 800 1000 1250 0.1 0.2 0.3 0.1 0.1 0.3 0.0 0.0 0.0 1600 2000 2500 0.4 0.5 0.6 0.5 0.6 0.7 0.1 0.2 0.6 3150 4000 5000 0.8 1.0 1.5 1.1 1.
Specifications Diffuse Field Correction Factors Nominal Frequency [Hz] M2230 Microphone [dB] 50 63 80 0.0 0.0 0.0 100 125 160 0.0 0.0 0.0 200 250 315 0.0 0.0 0.0 400 500 630 0.0 0.0 0.0 800 1000 1250 0.1 0.1 0.1 1600 2000 2500 0.2 0.4 0.5 3150 4000 5000 0.5 1.1 1.7 6300 8000 10000 1.9 2.6 3.3 12500 16000 20000 4.8 6.1 8.
Specifications 20. Technical Data PreAmplifier MA220 PreAmplifier Microphone PreAmplifier Compatible with 1/2” microphone capsules type WS2F in accordance with IEC61094-4 Frequency Range 4 Hz - 100 kHz Residual Noise Floor typical Frequency Response Flatness 1.6 mV(A) at C_in 18pF ≙ 12 dBA @ 20 mV/Pa Phase Linearity < 1° @ 20 Hz - 20 kHz Maximum Output Voltage Electronic Data Sheet 21 Vpp ≙ 7.4 Vrms ≙ 145 dBSPL @ 20 mV/Pa, THD 3%, 1 kHz Impedance Input: 20 GOhm // 0.
Specifications Appendix Appendix 1: Standard - Optional Features Standard Features Optional Sound Level Meter Frequency Weighting Sound Level Meter Time weighting • Extended Acoustic Pack: Impulse Sound Exposure Level Percentile Sound Pressure Levels for wide band, 1/1 and 1/3 octave spectrum with flexible setting from 1% - 99%.
Appendix Standard Features Optional • Extended Acoustic Pack: Clock-Impulse Maximum Level (Taktmaximalpegel) in accordance with DIN 45645-1: Sound Level Meter Parameter Calculated levels in accordance with DIN 45645-1: Sound Level Meter RTA Spectrum Analyzer • Extended Acoustic Pack or Spectral Limits Option: True peak level Sound Level Meter Audio Recording Sound Level Meter Triggered Event Recording 222 • Recording of wav-files (ADPCM compression) • Voice note recording • Extended Acoustic Pack:
Appendix Standard Features Sound Level Meter Logging Optional 100 ms logging FFT Analysis Measurement Range • Extended Acoustic Pack: • Spectral Limits: FFT + Tol Capture and Tolerance not available RT60 with zoom function with zoom function • Spectral Limits: Capture and Tolerance functionality • Extended Acoustic Pack: 1/3 octave band results 1/12 Oct + Tol function not available • Spectral Limits: 1/12 Oct + Tol Capture and Tolerance functionality Noise Curves function not available • Spec
Appendix Standard Features Querying measurement data online via the USB interface 224 Optional • Remote Measurement Option supporting SLMeter/RTA and RMS/THD+N function
Appendix Appendix 2: Factory Default Profiles You may start up the XL2 with individual preset application profiles. DIN15905-5 / DIN15905-5 & Audio (Sound Level Monitoring in accordance with DIN15905-5) The following limits apply at all areas accessible by the visitors during the measurement period of 30 minutes: • Maximum averaged level = 99 dB The XL2 displays this maximum level with the measurement result LAeq+k1.
Appendix These levels are shown in the numeric result page: LAeq5”+k1 Time-averaged sound pressure level LAeq with correction value k1 and a moving time window of 5 seconds. LAeq+k1 Time-averaged sound pressure level LAeq with correction value k1. LCpeak+k2 C-weighted peak level LCpeak with correction value k2. The following sound levels are displayed in the real-time analyzer page: LZFhold3 For tracing of feedback frequencies. The peak hold time is set to 3 seconds.
Appendix Limits This profile is configured with the following limits, which trigger the lights on the limit button and external Digital I/O Adapter. This facilitates a quick response to sound levels that exceed these limits.
Appendix The following sound levels are displayed in the real-time analyzer page: These levels are shown in the numeric result page: LAeq5”+k1 Time-averaged sound pressure level LAeq with correction value k1 and a moving time window of 5 seconds. LAeq60’+k1 Time-averaged sound pressure level LAeq with correction value k1 and a moving time window of 60 minutes. LAFmax+k1 Maximum sound pressure level LAFmax with correction value k1. 228 LZFhold3 For tracing of feedback frequencies.
Appendix In accordance with SLV, all sound levels are measured, displayed and logged to SD Card automatically. The settings are locked, which ensures that the correct parameters are measured. The profile #SLV 100dB & Audio includes the recording of Compressed+AGC wav-files. Limits This profile is configured with the following limits, which trigger the lights on the limit button and external Digital I/O Adapter. This facilitates a quick response to sound levels that exceed these limits.
Appendix Appendix 3: Description Sound Levels A-Frequency Weighting Filter in accordance with IEC 61672 Applicable for most common sound pressure level measurements, compensating for human hearing perception at lower sound pressure levels. C-Frequency Weighting Filter in accordance with IEC 61672 Applicable for very high sound pressure levels, compensating for human hearing perception at high sound pressure levels; typically used for measurements of peak values, e.g.
Appendix 10h 00min 06sec Leq5” = Leq of the time window from 10h 00min 01sec to 10h 00min 06sec 10h 00min 07sec Leq5” = Leq of the time window from 10h 00min 02sec to 10h 00min 07sec Application example: • Display the moving Leq over 5 seconds in accordance with DIN15905 • Measure the moving Leq over 60 minutes in accordance with SLV2007 Fast Time Weighting Time constant t = 125 ms; the time weighting is an exponential function of time, which defines how changes of the instantaneous sound pressure leve
Appendix Parameter live Actual current sound pressure level. Parameter max Maximum sound level of the measurement cycle. Parameter min Minimum sound level of the measurement cycle. Correction Value off No correction value, default setting. Peak Level Application example: Measure LCpeak in accordance with DIN15905 The RTA spectrum analyzer measures the true peak level with the optional Extended Acoustic Pack. The peak hold time can be set to 0, 1 or 5 seconds.
Appendix Parameter T3 equivalent Time-average Clock-Impulse Maximum Level (Taktmaximalpegel) LAFT3eq in accordance with DIN 45645-1. Z-frequency weighting in accordance with IEC 61672 (= flat frequency response, no filter) Overall sound pressure level, all sound signal components are included; required for special applications. Parameter T5 Clock-Impulse Maximum Level (Taktmaximalpegel) LAFT5 in accordance with DIN 45645-1.
Appendix Appendix 4: Common Sound Levels Display Application LAE Sound Exposure Level The sound exposure level LAE is the LAeq normalized to 1 second. The sound exposure level is measured to compare noise events with different time durations. The LAE reports the amount of noise from an event such as an individual aircraft fly-over. LAE = LAeq + 10 x log (time in seconds) LAeq Time-Average Sound Level or Equivalent Continuous Sound Level Averaged sound level over time with A frequency weighting.
Appendix LAeq + k1 Time-Average Sound Level with Correction Value The actual measurement position often differs to the loudest position of the live event. Thus the correction value k1 is the correction value of LAeq between the loudest position and the actual measurement position, measured using pink noise. The correction value k1 is measured or manually set in the page KSET of the sound level meter function.
Appendix LAeq60’ +k1 Moving Time-Average Sound Level with Correction Value k1 The actual measurement position often differs to the loudest position of the live event. Thus the correction value k1 is the correction value of LAeq60’M between the loudest position and the actual measurement position, measured using pink noise. The correction value k1 is measured or manually set in the page KSET of the sound level meter function.
Appendix LAFmin dt Minimum Sound Pressure Level “delta t” in report Minimum level of the preset logging interval in the LOG-menu, e.g. 1 second. LAFxx% Percentile Sound Level The statistical distribution of sound pressure levels is commonly used for environmental noise analysis, such as road traffic or community noise assessments. For example LAFxx% is the noise level exceeded during xx% of the measurement period; e.g., LAF90% is the noise level exceeded during 90% of the measurement period.
Appendix LCeq Time-Average Sound Level or Equivalent Continuous Sound Level Averaged sound level over time with C frequency weighting. LCpeak Peak Sound Pressure Level Sound pressure level with C frequency weighting and peak time weighting. Measures the peak level. High peak levels can damage the human hearing. LCpeak max Maximum Peak Sound Pressure Level Maximum sound pressure level with C frequency weighting and peak time weighting. Measures the peak level.
Appendix LEX Noise Exposure Level LEX The Noise at Work Directive 2003/10/EC lays down minimum requirements for the protection of workers from risks to their health and safety arising or likely to arise from exposure to noise and in particular the risk to hearing.
1000 dt 04.
