Product data

14
Measurement Control
Measurement Sequence: Supports measuring:
• at all microphone positions before using another source
• at a microphone position for all sources before measuring at a new
position
• at subsequent microphone positions without source information
• at manually selected source and microphone positions
Measurements are started manually and can be automatically stored on
completion of measurement
Generator (L1, L2 and T2): The noise generator is turned on and off
automatically
Escape Time: 0 to 60 s
Build-up Time: 1 to 10 s
The generator can be turned on and off manually for checking equipment
and sound levels
EXCITATION T2
Interrupted Noise: Measurements are started manually and can be
automatically stored on completion of measurement
Number of Decays per Measurement: 1 to 100, ensemble averaged
into one decay
Impulse: Manual start of first measurement. When level (say from starter
pistol) exceeds the user-selected trigger level, the decay is recorded and
backwards integration performed (Schroeder method). The trigger can
then be armed automatically for measuring at the next position
Signal Recording: Recording of the Z-weighted measured signal can be
done at each position
*
Measurement Status
On Screen: Information such as overload, awaiting trigger and
running/paused are displayed on screen as icons or text
Traffic Light: Red, yellow and green LEDs show measurement status
and instantaneous overload as follows:
• Yellow LED flashing every 5 s = stopped, ready to measure
• Green LED flashing slowly = awaiting trigger or calibration signal
• Green LED on constantly = measuring
• Yellow LED flashing slowly = paused, measurement not stored
• Red LED flashing quickly = intermittent overload, calibration failed
Calibration
Initial calibration is stored for comparison with later calibrations
Acoustic: Using Sound Calibrator Type 4231 or custom calibrator. The
calibration process automatically detects the calibration level when
Sound Calibrator Type 4231 is used
Electrical: Uses internally generated electrical signal combined with a
typed-in value of microphone sensitivity
Calibration History: Up to 20 of the last calibrations made are listed and
can be viewed on the instrument
Signal Monitoring
Input signal A-, C- or Z-weighted can be monitored using an
earphone/headphones connected to the headphone socket
Headphone Signal: Input signal can be monitored using this socket with
headphones/earphones
Gain Adjustment: –60 dB to 60 dB
Voice Annotations
Voice annotations can be attached to the building acoustics project and to
measurements at each position
Playback: Playback of voice annotations or signal recordings can be
listened to using earphone/headphones connected to the headphone
socket
Gain Adjustment: –60 dB to 0 dB
Text & Image Annotations
Text and image (Type 2270 only) annotations can be attached to the
building acoustics project and to measurements at each position
Data Management
Project Template: Defines the display and measurement setups
Project: Measurement data for all positions defined in source room (L1)
and in receiving room (L2, B2 and T2) are stored with the Project
Template
Re-use of data: Data for L1, B2 or T2 in one project can be re-used in
another project
Job: Projects are organised in Jobs
Explorer facilities for easy management of data (copy, cut, paste, delete,
rename, view data, open project, create job, set default project name)
Specifications – Signal Recording Option BZ-7226
Signal Recording Option BZ-7226 is enabled with a separate license. It
works with all the software for Type 2250/2270: Sound Level Meter,
Frequency Analysis, Logging Software, Enhanced Logging Software and
Reverberation Time Software
For data storage, Signal Recording requires either:
• SD Card
• USB Memory Stick
RECORDED SIGNAL
A-, B-, C- or Z-weighted signal from the measurement transducer
AUTOMATIC GAIN CONTROL
The average level of the signal is kept within a 40 dB range, or the gain
can be fixed
PLAYBACK
Playback of signal recordings can be listened to using the
earphone/headphones connected to the headphone socket
SAMPLING RATE AND PRE-RECORDING
The signal is buffered for the pre-recording of the signal. This allows the
beginning of events to be recorded even if they are only detected later.
RECORDING FORMAT
The recording format is 16- or 24-bit wave files (extension .wav) attached
to the data in the project, easily played-back afterwards on a PC using
BZ-5503. Calibration information is stored in the .wav file, allowing
PULSE to analyse the recordings
*
Signal Recording requires an SD card or USB stick for data storage and a license
for Signal Recording Option BZ-7226
Sampling
Rate (kHz)
Maximum
Pre-recording (s)
Sound
Quality
Memory
(KB/s)
8 470 Low 16
16 230 Fair 32
24 150 Medium 48
48 70 High 96