l a u n a M s ’ r e s U [ MSD100 MSD100AES/SA MSD100T/SA MASTER STEREO DISPLAY www.dk-audio.
MSD100 Series - User’s Manual Copyright © 1995, 1997, 2002, DK-Audio, Herlev All rights reserved. No part of this publication may be reproduced or distributed in any form, or by any means, without prior written consent from DK-Audio A/S, Denmark. Trademarks Analog Devices is a registered trademark of Analog Devices, Inc. USA Crystal is a registered trademark of Crystal Semiconductor Corp., USA Note: This manual covers all MSD100 Series models. The main text refers to the MSD100 but applies to all models.
MSD100 Series - User’s Manual CONTENTS 1. Introduction 1.1 1.2 1.3 1.4 Using This Manual . . . . Notation Conventions . Related Documentation If You Need Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 4 4 Audio Metering . . . . . . . . . . . . . . . . . . . . . . . MSD100 Applications . . . . . . . . . . . . . . . . . . Physical Overview . . . . . . . . . . . . . . . . . . . . .
MSD100 Series - User’s Manual 4.8 Selecting PPM Options . . . . . . . . . . . . . . . . 4.8.1 Selecting Preferred PPM Scale . . . . . . 4.8.2 Selecting the PPM Reference Level . . 4.8.3 Using the LED Overload Indicators . . . 4.8.4 Using the PPM Peak Hold Function . . 4.8.5 Using the PPM FAST Mode . . . . . . . . 4.9 Changing Default Settings . . . . . . . . . . . . . . 4.10 Bitstream Status Display . . . . . . . . . . . . . . 4.10.1 AES/EBU Decoding Mode . . . . . . . . 4.10.2 Consumer Decoding Mode . . .
MSD100 Series - User’s Manual List of Tables Table Table Table Table Table Table 2-1 2-2 3-1 3-2 4-1 4-2 MSD Rear Panel Connections . . . . . . . 6 MSD Comparison Summary . . . . . . . . . 8 MSD Series Audio Connections . . . . . 10 MSD Supply Voltage Specifications . . 11 Ideal Stereo and Mono Signals . . . . . . 14 Data Information for AES/EBU Mode . 22 List of Figures Figure 1-1 MSD Master Stereo Display . . . . . . . . 1 Figure 4-1 MSD Main Display . . . . . . . . . . . . . .
MSD100 Series - User’s Manual 1. INTRODUCTION This section provides a description of the MSD100 Series, lists related documentation and notation conventions, and provides product support contact information. The DK-Audio MSD100 Master Stereo Display Series models are universally recognised professional audio metering system for broadcast and studio applications. The MSD100 Series supplements the human ear by providing a visual representation of audio level, phase, stereo imaging and more.
MSD100 Series - User’s Manual The MSD100 Series models deliver monitoring capabilities beyond traditional instruments such as bar graphs, LEDs and oscilloscopes. All MSD100 Series units provide the following basic functions: • • • • • • Phase Meter Audio Vector Oscilloscope Level Meter with selectable PPM/VU scales Selectable reference level LED overload Indicator Peak Hold 2 1.
MSD100 Series - User’s Manual Section 4 Section 5 Section 6 Set-up and Operation. Provides instructions on how to operate the MSD and use the main display, control keys, phase correlation meter, audio vector oscilloscope, and peak programme meter. It describes how to interpret displayed data, adjust PPM peak hold meters, input gain, utilities, brightness, and viewing angle. Digital AES/EBU Versions. Describes the operation of the bitstream status display on the digital audio MSD100AES/SA model.
MSD100 Series - User’s Manual Boldface Type Italic type Keys you must press, such as [LEFT], [UTIL], [CAL], [DEFAULT] and [EXIT] keys. Emphasises operational differences of specific models, such as This function is not available on the MSD100AES/SA. 1.3 Related Documentation The Audio Metering book provides additional information about related technologies, and is available from your local dealer. • Audio Metering, Eddy Bøgh Brixen, Broadcast Publishing & DK-Audio A/S, Denmark 2001 4 1.
MSD100 Series - User’s Manual 5 2. Overview Audio vector oscilloscope Picture of audio signal indicating mono or stereo patterns This section provides an overview of MSD100 audio metering functions, applications, a physical description and a summary comparison table. 2.2 MSD100 Applications 2.
MSD100 Series - User’s Manual • Peak hold • Simultaneous display of stereo information and audio levels • Softkey selectable PPM characteristics • Support for most international standards • Digital processing, eliminating scale errors • Storage of all user defined parameters in NV-RAM • Long life CCT backlight (15.000 hours) • Digital Data Readout (100AES/SA) • FFT and 1/3 octave spectrum analyser (100T/SA and 100AES/SA) 2.
MSD100 Series - User’s Manual Recommended supply voltages are: • 12 to 30V DC • 12 to 20V AC, 50Hz An optional 230V power supply, such as the Model MSD100-PS/0, is available with the following typical specifications: Input: 100-240V AC, 47-63 Hz, 1.0A Output:15V DC, 1.0A, 15W max. ! Caution Caution: High voltage for the LCD background light is generated internally. Use special care when servicing as 600V AC is present on the circuit board.
Supply voltage range Dimensions (mm) HxWxD MISCELLANEOUS Phasemeter Audio vector oscilloscope PPM/VU Level meter scales FFT Spectrum Analyser 1/3 octave spectrum analyser ANALYSER LED overload Audio connectors Analogue stereo outputs Digital AES/EBU inputs Digital AES/EBU outputs Analogue stereo inputs INTERFACE Display Type Colour/Mono Display view area (mm) DISPLAY + + - + + + + 6 1 Link (loop through of dig.
MSD100 Series - User’s Manual 3. Installation This section describes how to mount the MSD100 and connect audio and power. 3.1 Mounting All MSD100 models are supplied with the following accessories for easy mounting on any console or desk: • Circular base plate • Bracket (U-form) • 3 finger screws with washers The bracket facilitates horizontal and vertical adjustment for optimum viewing. 3.1.
MSD100 Series - User’s Manual 3.2 Audio Connections For all MSD100 models, please observe the following precautions: • Use standard audio signal cable or similar • Ensure that all connections are firmly secured • Allow sufficient loose cable for the unit to be tilted and turned 10 TABLE 3-1.
MSD100 Series - User’s Manual 3.3. Power Connection Each MSD100 Master Stereo has a 2.1 mm DC-power socket on the rear of the unit. Power can be fed from a standard power adapter or from an appropriate power source in your console or desk. Table 3-2 lists the AC and DC operating range and operating recommended supply voltages. TABLE 3-2.
MSD100 Series - User’s Manual 12 4. Operation 4.
MSD100 Series - User’s Manual 4.1.1 INITIAL DISPLAY AT POWER UP After power up, the LCD panel initially displays the software version installed, for example MSD100 1.54. 4.1.2 FUNCTION KEYS The three black keys operate the functions displayed in the menu text line directly above them. For example, the left function key toggles between SPECT and EXIT. An empty black box displayed next to a function in the menu text line, such as shown below, indicates that this function is disabled or OFF. 13 4.1.
MSD100 Series - User’s Manual 14 4.2 Phase Correlation Meter Table 4-1 and Figure 4-3 describe optimum stereo and mono signals measurements and corresponding displays. The Phase Correlation Meter displays the average phase relationship between two audio signals, and indicates mono, stereo or reverse-phase on a centre-zero scale. ☞ TABLE 4-1. IDEAL STEREO AND MONO SIGNALS 4.3 Audio Vector Oscilloscope Signal Ideal Stereo [0] Mono [+1] Display/Comment Perfect circle or ball. See Figure 4-3.
MSD100 Series - User’s Manual Ideal Stereo Signal Mono Signal Reversed Phase Stereo Signal 15 • Using a full-wave rectifier with integration time set for highest amplitude without overloading the transmission link and for sufficient duration to avoid audible distortion. • Long return time to minimise viewer fatigue. 4.4.1 INTERNATIONAL PPM SCALES SUPPORTED Left Signal Right Signal Reversed Phase Mono Signal Figure 4-3.
MSD100 Series - User’s Manual 16 4.6 Adjusting Input Gain [20dB] TYPE I TYPE IIA TYPE IIB NORDIC BBC EBU DIN VU DMU1 DMU2 Figure 4-4. Available PPM Scales Use the [UTIL] menu to select the different scales shown in Figure 4-4. You can increase the input sensitivity to obtain the best possible dynamic range and accuracy for a weak signal. To increase the input sensitivity by 20dB: Press the function button for . The checkbox turns black.
MSD100 Series - User’s Manual 4.7.1 ADJUSTING BRIGHTNESS 17 4.7.2 ADJUSTING VIEWING ANGLE (CONTRAST) To adjust the brightness of the display: To adjust the contrast of the display: 1 Press [UTIL]. Figure 4-5. Set Brightness/Inv Menu 2 Press [LIGHT]. The Set Brightness menu is displayed as shown in Figure 4-4. 3 Press function keys for and to increase or decrease brightness. This adjusts the background lighting for the best viewing clarity. 4 When finished, press [EXIT] to return to the Main Menu.
MSD100 Series - User’s Manual 18 4.7.3 SELECTING INVERTED DISPLAY 4.8.1 SELECTING PREFERRED PPM SCALE To reverse the colours so that the screen will appear black with white text and figures: You can select from up to seven international scales, described earlier in Table 4-2. To obtain the complete set of specifications, refer to the following recommendations: 1 Press [UTIL]. 2 Press [LIGHT]. The Set Brightness/ Inv Menu is displayed as shown earlier in Figure 4-4.
MSD100 Series - User’s Manual ☞ Note: The last choice, REF, is for setting the reference (test) level for that scale. 5 When the preferred scale is displayed, press [SELECT]. The selected scale is displayed. 6 Press [EXIT] to return to the Main Menu. 4.8.2 SETTING THE PPM REFERENCE LEVEL After you select the preferred PPM scale, you can set the reference (test) level for that scale. To set the PPM reference level: 1 Perform Steps 1 through 5 under Selecting Preferred PPM scale.
MSD100 Series - User’s Manual the last HOLD reset. HOLD reset is activated by reselecting any function scale. To select Peak HOLD: 1 Press [UTIL]. 2 Press [PPM]. 3 Press [OPTION]. The menu text line displays TOGGLE PPM OPTION. 4 Press [HOLD] to toggle the Peak HOLD function ON or OFF. When ON, the checkbox next to HOLD is black. 5 When finished, press [EXIT] to return to the Main Menu. 20 To select the FAST Mode: 1 Press [UTIL]. 2 Press [PPM]. 3 Press [OPTION].
MSD100 Series - User’s Manual 21 4.10 Bitstream Status Display The Bitstream Status Display is used for viewing status information for each AES/EBU channel, provided that this information is available in the signal. This display is included in MSD100AES/SA. 4.10.1 AES/EBU DECODING MODE Table 4-3 lists the Bitstream Status Display information for the AES/EBU (Professional) decoding mode: Figure 4-7.
Professional (AES/EBU) or Consumer protocol – IEC958 (S/PDIF) None - No emphasis indicated No emphasis, manual selection not possible Emphasis 50/15 µs Emphasis ITU J.17 Sampling rate lock not indicated Sampling rate of source not locked Not indicated Sampling rate = 48 kHz Sampling rate = 44.
MSD100 Series - User’s Manual 4.10.2 CONSUMER DECODING MODE To return to the main menu, press the same key again. The Bitstream Status display can also be used for decoding information from consumer-grade sources, using the protocol for Sony Philips Digital Interface S/PDIF) or IEC958. Although the structure of the stream is similar to AES/EBU, there are a number of important differences: 4.
MSD100 Series - User’s Manual Figure 4-6 shows the FFT Spectrum Analyser display on the MSD100/SA. To select the FFT Spectrum Analyser mode: 1 Press [FFT]. The FFT screen is displayed, as shown in Figure 4-6. Frequency indicators from 44 Hz to 20.000 Hz appear at the bottom of the screen. Level indicators, in 10dB increments from –70 to +10dBu appear on the left side. FIGURE 4-8. FFT Spectrum Analyser 24 2 Press [LEFT] or [RIGHT] to select the left or right input signal for FFT analysis.
MSD100 Series - User’s Manual Appendix A A.3 Level Meter Specifications This appendix lists the performance specifications for the MSD100 Series. Reference indication Reference input voltage Reference input voltage adjustment Division of scale: A.1 Power Supply Supply voltage range DC current consumption @12V nominal supply Power dissipation Safety standard DC input: 12V to 30V AC input: 12V to 20V <600 mA 6.5W, approximately IEC 65 An optional 230V/50Hz AC power supply adapter is available. A.
MSD100 Series - User’s Manual Reversibility error None Input impedance, analogue >20 K ohm Input impedance, AES 1 K ohm Distortion introduced by None the PPM: Temperature range 0˚C to 45˚C Overload characteristics Maximum input level >21 dBu 90V RMS constant A.4 Phase Correlation Meter Indication range 1 to +1 A.5 Audio Vector Oscilloscope Automatic gain adjusting range Phase error between channels Display area 30 dB, default None 69 mm x 69 mm 26 A.
MSD100 Series - User’s Manual Glossary This glossary defines terms, acronyms and abbreviations used in this manual. Audio Vector Oscilloscope Instrument that provides continuous graphic display in Lissajous format of the phase and amplitude of a stereo signal. Also known as stereo image monitor or goniometer. Ampere; A unit of current measurement. Bandwidth The distance between the 3 dB cut-off frequencies on a response curve. Expressed in octaves or Hz. Alternating current.
MSD100 Series - User’s Manual Emphasis The requisite frequency correction upon recording and playback in order to obtain a proper frequency response. Fast Fourier Transform (FFT) A spectrum analyser using this complex FFT algorithm outperforms earlier analogue counterparts in the number of frequency bands and indication range. Goniometer See audio vector oscilloscope. 28 LED Light-Emitting Diode.
MSD100 Series - User’s Manual PPM VU See Peak Programme Meter. RMS Root Mean Square; the effective value of a signal. Volume Unit. Measurement in dB for modulation with a reference of 1.23 V. Watt Measurement unit for power. S/PDIF Sony Philips Digital Interface defined as the consumer format. Spectrum Analyser An instrument used for determining frequency content (energy distribution) of a signal. Stereo Image Monitor See audio vector oscilloscope.
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