Tektronix VM700T User Manual
  1. Manuals
  2. Brands
  3. Tektronix Manuals
  4. Measuring Instruments
  5. VM700T
  6. User manual

Tektronix VM700T User Manual

Ideo measurement set option 40/41/42 audio measurements
Hide thumbs Also See for VM700T:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Service Manual, User Manual
User Manual
VM700T Video Measurement Set
Option 40/41/42 Audio Measurements
070-9656-00

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the VM700T and is the answer not in the manual?

Questions and answers

Related Manuals for Tektronix VM700T

Summary of Contents for Tektronix VM700T

  • Page 1 User Manual VM700T Video Measurement Set Option 40/41/42 Audio Measurements 070-9656-00...
  • Page 2 User Manual VM700T Video Measurement Set Option 40/41/42 Audio Measurements 070-9656-00...
  • Page 3 Commercial Computer Software – Restricted Rights clause at FAR 52.227-19, as applicable. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved.
  • Page 4 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located.

  • Page 6: Table Of Contents

    ......... . 2–27 VM700T Option 40/41/42 Audio Measurements User Manual...
  • Page 7 ..... . . Check Frequency and Phase Measurement Accuracy ..... VM700T Option 40/41/42 Audio Measurements User Manual...
  • Page 8 ......... B-13 Option 41 Frequency Accuracy and Channel Phase Difference ..B-13 Index VM700T Option 40/41/42 Audio Measurements User Manual...
  • Page 9 ..........VM700T Option 40/41/42 Audio Measurements User Manual...
  • Page 10 3–7 Table A-1: O.33 Automatic Audio Test Measurement Specifications ..Table A-2: Tektronix Automatic Audio Test Measurement Specifications ..Table A-3: Frequency and Noise Specifications ......
  • Page 11 Table of Contents VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 12: Preface

    Preface This manual describes configuring and using the audio measurement options, Option 40, Option 41, and Option 42, for the VM700T Video Measurement Set. Contents of This Manual This manual consists of the following sections: Getting Started introduces the VM700T audio options by briefly describing the capabilities of each.
  • Page 13 37 connector. A female DB 37 connector is provided with Option 41 to use for fabricating the interconnecting cable that applies the signals to be measured to the triple input of the VM700T. Either Option 40 or Option 41 may be installed in the VM700T, not both.

  • Page 14: Getting Started

    Getting Started...

  • Page 16: Configuring The Audio Option

    Configuring the Audio Option The approach to configuring the VM700T Audio option is similar to that used for its video functions. Refer to the VM700T Option 01 (NTSC) & Option 11 (PAL) User Manual if you need additional information on configuring the VM700T.

  • Page 17: Figure 1-1: The Configure Menu

    Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Figure 1–2: Configure menus choices VM700T Option 40/41/42 Audio Measurements User Manual 1–2...

  • Page 18: Configuring The Audio Limit Files

    If a default audio limits file is acceptable, the VM700T uses it (if it is the selected file) for making measurements on the input audio signals. If you must modify the audio limits from the system defaults, use the procedures given in the following text.

  • Page 19: Creating An Audio Limit File

    Both the character keys and the soft key “lock” when selected. are unlocked by touching the same key again or touching the unselected key of the pair. is unlocked by touching again. VM700T Option 40/41/42 Audio Measurements User Manual 1–4...

  • Page 20: Figure 1-5: File Naming Keyboard

    The VM700T now displays the new file containing the audio limits from the file you selected as the template. You can modify the parameters in this file.
  • Page 21 That way, if you make a mistake and must exit the file, your earlier work will be retained while the most recent change (or mistake) is eliminated. Editing an Audio Limit Graphic Element. The VM700T audio limit files contain graphical displays whose limits can be configured. These include the following graphical displays:...

  • Page 22: Deleting A Modified Audio Limit File

    You can select and press a soft key to display the parameters in a file, but the parameters in the system files can not be modified. To modify file parameters, you must do the following tasks: VM700T Option 40/41/42 Audio Measurements User Manual 1–7...

  • Page 23: Figure 1-6: Selecting An Audio_Source File To Use As A Template

    If the system default audio source file is acceptable, the VM700T will use this file as it performs audio measurements (if it is the selected file). If you must modify the audio source file, read the following paragraphs.
  • Page 24 1–4. 4. Press the soft key. The VM700T now displays the contents of the new file containing the audio source data from the file you selected as the template. You can modify the parameters in this file.
  • Page 25 Audio Printout Title text. Similar to the Tektronix 760 meter face, but with its –8 dB tick mark labeled “TEST.” The lineup level is at the TEST, or –8 dB tick on this meter. Ballistics are the same as for the DIN 45406 meter.

  • Page 26: Configuring Source_Selection~Audio For Option

    (source A, B, or C). NOTE. The audio channel can be associated with one of three video inputs (Source A, B, or C). However, switching the VM700T from one video input to another during an audio measurement sequence can cause the most recent audio test data to be lost.

  • Page 27: Connecting To A Source

    Refer to Option 41 and Option 42 beginning on page 2–29 for connecting Option 41 inputs to a signal source. The VM700T Audio option is supplied with two male mini-XLR to female XLR adapter cables wired as shown in Figure 1–7. The mini-XLR ends of these cables connect the Audio option to an appropriate audio signal source.

  • Page 28: Operating Basics

    Operating Basics...

  • Page 30: Audio Analyzer

    Audio signal input limits may be selected at configuration and enabled or disabled in the main Audio Analyzer menu (Limits: ON/OFF). When enabled, the selected limits are shown in the displays. Figure 2–1: The Audio Analyzer display (O.33 test sequence) VM700T Option 40/41/42 Audio Measurements User Manual 2–1...

  • Page 31: Audio Analyzer Main Menu

    Plot ON/OFF enables or disables the plotting of an input signal. ON/OFF When the plot is disabled (OFF), the display retains any information previously plotted. Erase Plot clears the plot in preparation for new data. VM700T Option 40/41/42 Audio Measurements User Manual 2–2...

  • Page 32: Figure 2-2: The Audio Analyzer Menu Tree

    The View Diff softkey is displayed only for the Graph Levels selection; it disappears when Graph THD + N or Graph Ch. Sep. are selected. Figure 2–2: The Audio Analyzer menu tree VM700T Option 40/41/42 Audio Measurements User Manual 2–3...

  • Page 33: Select Graph Submenu

    View L & R permits viewing both channel is the same display. The vertical scale of each channel is reduced to fit the two channels into the display area. VM700T Option 40/41/42 Audio Measurements User Manual 2–4...

  • Page 34: Special Setups Submenu

    The VM700T digitizes an audio signal measured in a selectable 92 dB window over a total range of 132 dB. The input ranges of the left and right channels may be configured independently with the soft keys.

  • Page 35: Audio Monitor

    For information on configuring the phase display, see Configuring the Audio Option beginning on page 1–1. The VM700T Configuration directory allows you to configure these Audio Monitor functions: Level meter scales: DIN 45406 or Nordic ppm dB or VU...

  • Page 36: Audio Monitor Phase Display Menu

    The Audio Monitor time display (see Figure 2–4) plots the left and right channel Display signal voltage levels on the y-axis and time on the x-axis. Figure 2–4: The Audio Monitor time display VM700T Option 40/41/42 Audio Measurements User Manual 2–7...

  • Page 37: Audio Monitor Time Display Menu

    Figure 2–5 shows the Audio Spectrum display. Note that this illustration is a screen capture of the third acquisition in a 10 acquisition average display. Figure 2–5: The Audio Spectrum display VM700T Option 40/41/42 Audio Measurements User Manual 2–8...

  • Page 38: Figure 2-6: The Audio Spectrum Menu Tree

    A: –62 to +30 dBu range B: –72 to +20 dBu range C: –82 to +10 dBu range D: –92 to 0 dBu range E: –102 to –10 dBu Figure 2–6: The Audio Spectrum menu tree VM700T Option 40/41/42 Audio Measurements User Manual 2–9...

  • Page 39: Audio Spectrum Main Menu

    NOTE. The VM700T can display distorted or incorrect signal information if the input range window is not matched to the input signal. When the input range window and the input signal are not matched, the VM700T clips the input signal to the range of the window and displays the clipped signal.

  • Page 40: Figure 2-7: The Audio Spectrum Display In High Res Mode

    The Harmonic Analyzer is a useful tool for locating frequency contamination caused by signals with fundamental frequencies in the 35 Hz to 10 kHz range. Rescale returns the display scaling to its default values. VM700T Option 40/41/42 Audio Measurements User Manual 2–11...

  • Page 41: Special Setup Submenu

    Range most closely matches the amplitude range of the input signal. The VM700T digitizes an audio signal measured in a selectable 92 dB window over a total range of 132 dB. The input ranges of the left and right channels may be configured independently with the soft keys.

  • Page 42: Cursors Submenu

    You can view seven levels of harmonics from 20 Hz to 20 kHz. Harmonics selects the 50 Hz fundamental frequen- of 50 Hz cies for display. These selection and the Harmonics of 60 Hz choice can help you locate power source frequency contamina- tion. VM700T Option 40/41/42 Audio Measurements User Manual 2–13...

  • Page 43: View Audio Auto Test

    This means that audio measurements may be captured for later display even while video capture and display operations are in progress. However, when the VM700T is running an Audio option application, it cannot simultaneously monitor the automatic test sequences.

  • Page 44: The Show Text Display

    The Show Text display of the View Audio Auto Test shows the results of the current test. Figure 2–10 shows the View Audio Auto Test screen display for Tektronix Program 93 received from a Tektronix ASG100 or ASG140 Audio Signal Generator. The display is different for each Auto Test as different measurements are made.

  • Page 45: Figure 2-10: The View Audio Auto Test Text Screen Display

    The information in the show text display changes to show the actual measurements made on received automatic test sequences. The following measurements are those included in Tektronix Program 93. Other test programs will display the measurements done during their sequences.

  • Page 46: Tek Test: 93

    THD at TEST Level + 15 dB sweep portion +15 dB) of the test sequence. Max. Crosstalk Measures the maximum channel-to-channel crosstalk (in dB) during sweep during the crosstalk portion of the test sequence. VM700T Option 40/41/42 Audio Measurements User Manual 2–17...

  • Page 47: Tek Test: 95

    TEK TEST: 95 The Tek:95 sequence provides a signal to measure ANSI Crosstalk. The View Audio Test results for Tektronix Program 95 reports the following measure- ments: Insertion Gain Error (dB) Sweep Max. Gain (dB) Sweep Min.

  • Page 48: Graphical Display Of Audio Auto Test Signals

    (in Tek sequences). The default lower test limit is a mirror of the upper test limits. You may configure the elements of the View Audio Auto Test function in the VM700T Configure Files directory. For information on configuring View Audio Auto Test, refer to Configuring the Audio Option beginning on page 1–1.

  • Page 49: View Audio Auto Test Menu

    +10 dB Level portion of a test sequence containing a THD sweep test signal. THD at TEST graphs the results of the THD at TEST +15 dB +15 dB Level portion of a test sequence containing a THD sweep test signal. VM700T Option 40/41/42 Audio Measurements User Manual 2–20...

  • Page 50: Graph Crosstalk Submenu

    View plots the crosstalk from the left channel into the right channel for test sequences that include a crosstalk test sweep signal. Rescale restores the default scaling for the display. VM700T Option 40/41/42 Audio Measurements User Manual 2–21...

  • Page 51: Multitone Analyzer

    The VM700T Audio option Multitone Analyzer addresses this problem. Instead of measuring a single-frequency sine wave, the Multitone Analyzer measures a test signal consisting of sine waves at several frequencies.

  • Page 52: Figure 2-12: The Multitone Analyzer Level Versus Frequency Display In View Levels Mode

    (in dBu) of the reference signal used reference signal frequency left- and right-channel input range selected name of the multitone input signal The menu hierarchy of Multitone Analyzer is shown in Figure 2–13. VM700T Option 40/41/42 Audio Measurements User Manual 2–23...

  • Page 53: Figure 2-13: The Multitone Analyzer Menu Tree

    A: –62 to +30 dBu range B: –72 to +20 dBu range C: –82 to +10 dBu range D: –92 to 0 dBu range E: –102 to –10 dBu Figure 2–13: The Multitone Analyzer menu tree VM700T Option 40/41/42 Audio Measurements User Manual 2–24...

  • Page 54: Multitone Analyzer Main Menu

    Range most closely matches the amplitude range of the input signal. The VM700T digitizes an audio signal measured in a selectable 92 dB window over a total range of 132 dB. The input ranges of the left and right channels may be configured independently with the soft keys.

  • Page 55: Change View Submenu

    Left Channel and Right Channel Distortion + Noise Submenu The following soft key choices are accessed by pressing the Menu button with the Left or Right Channel Distortion + Noise displays active. VM700T Option 40/41/42 Audio Measurements User Manual 2–26...

  • Page 56: Cursors Submenu

    Peak peak while showing the frequency and signal level of the peak on the numerical display. The cursors does not go to the highest peak. VM700T Option 40/41/42 Audio Measurements User Manual 2–27...

  • Page 57: Figure 2-15: The Multitone Analyzer Cursor Display With Both Cursors Active

    Operating Basics Figure 2–15: The Multitone Analyzer cursor display with both cursors active VM700T Option 40/41/42 Audio Measurements User Manual 2–28...

  • Page 58: Option 41 And Option 42

    Option 42. Triple channel input (option 41) Option 41 of the VM700T was introduced to provide an added audio input channel to fill the need for a customer. The extra channel input was found to be useful enough that it was released as a standard option for the VM700 family of Video Measurement Sets.

  • Page 59: Back Panel Audio Connector Pin Assignments

    Source Selection Audio directory and cancel any changes by asking you to touch the soft key again. Back Panel Audio The VM700T with Option 41 includes a 37-pin connector located on the Connector Pin instrument back panel. Pin assignments for the connector are listed in Table 2–1. Assignments Table 2–1: Audio Option 41 Connector Pin Assignments...

  • Page 60: Audio Signal Interconnection Cable

    Option 41 and Option 42 Audio Signal Tektronix supplies a DB-37 mating connector kit with Option 41 to assemble the Interconnection Cable signal interconnection cabling. The supplied kit, provides several sizes of cable adapter collars. Select the one fits your cable, and put it on the cable before assembling the wiring to the connector as shown in Figure 2–16.

  • Page 61: Figure 2-18: Ferrite Forms Installed On The Signal Interconnection Cable

    Tighten the tie wrap on the cable and trim off the excess end. Figure 2–18: Ferrite forms installed on the signal interconnection cable VM700T Option 40/41/42 Audio Measurements User Manual 2–32...

  • Page 62: Audio/Video Timing (Option 42)

    (audio and video) to arrive, or that one or the other has arrived and it is waiting for the other. Upon receiving both triggers, the VM700T makes the measurement and provides a delay time numerical readout and a graphical display.

  • Page 63: Vm700T Signal Hookup

    The selected channel (A, B, or C) on the VM700T is the source for the video part of the measurement, but audio signal selection is not automatic. With Option 40 you must externally switch the correct audio signal when switching the video measurement source between channels.

  • Page 64: Vits 200 And Asg 100/Asg140 Audio/Video Measurement

    0.5 seconds. The signal transitions from high to low at line 262 field 3. The audio output is turned ON at this time, but the text inserted by the VITS 200 does not appear until field 1 line 11. The VM700T Audio/Video Timing measurement removes this delay time before presenting the measured time difference.

  • Page 65: Figure 2-20: Cabling Between The Vits 200 And The Asg100/Asg140 For Vertical Interval

    ON at this time, but the text inserted by the VITS 200 does not appear until the active video. This means that the audio leads the video change. The VM700T Audio Video Timing measurement removes this delay time before presenting the measured time difference.

  • Page 66: Figure 2-21: Cabling Between The Vits 200 And The Asg100/Asg140 For Active Video

    2. Open S11 switch 4 and switch 10. 3. Press the Function button six times (until a C appears). Enter some text in the vertical interval like “AV TIME.” Only one character is needed. VM700T Option 40/41/42 Audio Measurements User Manual 2–37...

  • Page 67: Figure 2-22: Connecting The Vits 201 And The Asg100/Asg140 For Vertical Interval

    ON, but the text inserted by the VITS 201 does not become visible until line 10. This delay time is subtracted out of the VM700T A/V Timing measurement. Placing the Signal Text in the Active Video. This procedure is used to place the signal text in the active video.

  • Page 68: Figure 2-23: Cabling Between The Vits 201 And The Asg100/Asg140 For Active Video

    1 field 1. When the TTL signal is high, the audio output is ON, but the text inserted by the VITS 201 does not become visible until active video. This delay time is subtracted out of the VM700T A/V Timing measure- ment.
  • Page 69 Option 41 and Option 42 VM700T Option 40/41/42 Audio Measurements User Manual 2–40...

  • Page 70: Remote Commands And Keywords

    Remote Commands and Keywords...
  • Page 72 RS-232 interface requires that you connect a terminal or computer to the VM700T through one of the RS-232C ports (Port 0 or Port 1) with a correctly wired interconnect cable. If you use a computer, you will also need a suitable VM700T terminal program such as the Tektronix VMT application.

  • Page 73: Command Format

    Optional arguments are enclosed with [ ]. A discussion of command usage and arguments follows the command header. Note that, for serial remote control, VM700> is a prompt from the VM700T (which you can change), not an input. With Option 48, any prompt you see depends on the GPIB controller programming, it is not a return from the VM700T.

  • Page 74: Get Keyword [Channel-Letter]

    Example: Front panel button names are listed in Table 3–1. Table 3–1: Front Panel Button Names Display Picture Auto Freeze SelectLine Average Graticule Vector Help Waveform Menu XY (Arrow selector) Copy MoveExpand VM700T Option 40/41/42 Audio Measurements User Manual 3–3...

  • Page 75: Set Keyword [Channel_Letter] Value1 [Value2

    _ (underscore). For example, the softkey_name for the soft key is Noise_dB, and for it is H_Display. VM700T Option 40/41/42 Audio Measurements User Manual 3–4...

  • Page 76: Get And Set Command Keywords

    Group A Keywords Group A keywords report on or set the values of Audio option Configuration parameters. These keywords can be used only on a VM700T equipped with either the Option 40 or the Option 41 Audio Option. commands used with the Group A keywords have the following form:...

  • Page 77: Table 3-3: Group B Keywords For Audio Source Selection

    BSPF Stereo phase difference Frequency breaks Frequency breaks BGDL Stereo gain difference Lower BSPL Stereo phase difference Lower limit limit BGDU Stereo gain difference Upper BSPU Stereo phase difference Upper limit limit VM700T Option 40/41/42 Audio Measurements User Manual 3–6...

  • Page 78: Group W Keywords

    Source A Audio Config File WAIA Source A Audio Input WACB Source B Audio Config File WAIB Source B Audio Input WACC Source C Audio Config File WAIC Source C Audio Input VM700T Option 40/41/42 Audio Measurements User Manual 3–7...
  • Page 79 Remote Commands and Keywords VM700T Option 40/41/42 Audio Measurements User Manual 3–8...

  • Page 80: Appendices

    Appendices...

  • Page 82: Appendix A: Audio Option Specifications

    The value for other test levels can be calculated from the formula (–60 – Test Level). Measured with Quasi–Peak response as per CCIR 468-4 recommendation. The measurement range can be determined from the formula (70 + Test Level). Weighting filter as per CCIR 468-4 recommendation. VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 83: Table A-2: Tektronix Automatic Audio Test Measurement Specifications

    Appendix A: Audio Option Specifications Table A-2: Tektronix Automatic Audio Test Measurement Specifications Measurement Range Accuracy (Includes Flatness) Insertion Gain Error 6 dB 0.2 dB Sweep Gain (Min and Max) 12 dB 0.1 dB THD + N 0.03% to 70%...

  • Page 84: Audio Analyzer Specifications

    >350 Hz Constant bandwidth Measurement Filter Plot Mode Minimum frequency change 2 Hz Minimum dwell time 1 sec for input frequencies < 500 Hz, 500 ms for input frequencies 500 Hz VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 85: Audio Spectrum Specifications

    –20 dBu 0.2 dB 0.1 dB –20 dBu to –50 dBu 0.3 dB 0.1 dB –50 dBu to –60 dBu 0.5 dB 0.1 dB –60 dBu to –70 dBu 1.0 dB 0.1 dB VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 86: Multitone Analyzer Specifications

    Multitone 2 –18.9 dB Multitone 3 –13.8 dB Multitone 4 –15.9 dB Reference Frequency for Multitone Recognition Multitone 1 422 Hz Multitone 2 562 Hz Multitone 3 656 Hz Multitone 4 750 Hz VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 87: A/V Timing Specifications (Option 42

    Table A-10: Audio/Video Timing Measurement Specifications Characteristic Performance Requirement Audio Amplitude Window 92 dB Audio Amplitude Range –102 dB to +30 dB in five ranges Timing Range 65 ms Timing Accuracy 1 ms VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 88: Appendix B: Verification Procedures

    Before performing these procedures we recommend that you run the audio option diagnostics to ensure that the Audio Processor and Audio Analog boards are working properly. Refer to the VM700T Option 01 (NTSC) & Option 11 (PAL) User Manual or the VM700T Video Measurement Set Service Manual for information on how to select and run the Audio Option diagnostics.

  • Page 89: Table B-1: Test Equipment Required For Verification Procedures

    HP 3458A Digital Voltmeter. You may also use an AC voltage calibrator such as a Fluke 5700A for this measurement. Verify that the sine-wave generator can meet the amplitude accuracy specifications listed in Table B-1. VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 90: Option 40

    0.4 dB Level difference between channels is 0.2 dB at levels of –50 dBu and greater. Option 40 Level 1. Power on the VM700T and associated test equipment and let them warm up Accuracy and Flatness for 20 minutes. 2. Connect the sine-wave generator to the VM700T audio option left and right mini-XLR input connectors.

  • Page 91: Figure B-1: Option 40 Cable Connections For Level Accuracy And Flatness Check

    NOTE. For this connection, you may want to use the two female XLR to male mini XLR adapter cables supplied with the VM700T. If you do, you will need to furnish or fabricate an adapter on the signal generator end.

  • Page 92: Check Distortion And Distortion Measurement Accuracy

    Measurement Accuracy a. Apply a signal (between –20 dBu and +30 dBu in amplitude) from a sine-wave generator to the VM700T Audio Option 40. See Figure B-2 for a cabling diagram. The generator should be set at 50 Ω output resistance.

  • Page 93: Check Frequency And Phase Measurement Accuracy

    Phase Difference 2. Set the sine-wave generator for a frequency and amplitude in the specified frequency and amplitude range of the Audio option (20 Hz to 20 kHz, amplitude of –60 dBu or greater). VM700T Option 40/41/42 Audio Measurements User Manual...
  • Page 94 3. Check that the measured frequency is accurate to the limits shown in Table B-2 for the applied test signal frequency and level and that the phase difference between channels meets the phase difference specification. VM700T Option 40/41/42 Audio Measurements User Manual...
  • Page 95 Appendix B: Verification Procedure VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 96: Option 41 Triple-Input Audio

    7. When you have specified the audio inputs and source files, touch the soft key. 8. If the change is correct, touch the soft key, otherwise, touch soft key. VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 97: Table B-4: Accuracy And Flatness Specifications

    0.4 dB Level difference between channels is 0.2 dB at levels of –50 dBu and greater. Option 41 Level 1. Power on the VM700T and associated test equipment and let them warm up Accuracy and Flatness for 20 minutes. 2. Connect the sine-wave generator to the Option 41 audio input connector as in Figure B-3.

  • Page 98: Table B-5: Example Test Signals For Level And Flatness Test

    –10 dBu, –21 dBu, –40 dBu, –49 dBu, 100 Hz –51 dBu, –55 dBu, –59 dBu, 1 kHz –61 dBu, –65 dBu, –70 dBu 5 kHz 12 kHz 20 kHz 7. Repeat step 5 for channels B and C. B-11 VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 99: Check Distortion And Distortion Measurement Accuracy

    1. Check residual THD+N. Measurement Accuracy a. Apply a signal (between –20 dBu and +30 dBu) from a sine-wave generator to the VM700T Audio Option. See to Figure B-4 for connections. b. Run the Audio Analyzer measurement and verify that residual THD+N is 0.03% or less.

  • Page 100: Check Frequency And Phase Measurement Accuracy

    3. Check that the measured frequency is accurate to the limits shown in Table B-4 for the applied test signal frequency and level, and that the phase difference between channels meets the phase difference specification. B-13 VM700T Option 40/41/42 Audio Measurements User Manual...
  • Page 101 Appendix B: Verification Procedure B-14 VM700T Option 40/41/42 Audio Measurements User Manual...

  • Page 102: Index

    Index...
  • Page 104 2–5 set input range, 2–12 Display Time, 2–8 Auto in set input range, 2–25 displaying test signals, View Audio Auto Test, 2–19 Automatic Audio Test Specifications, A-1 Average Num, 2–10, 2–27 VM700T Option 40/41/42 Audio Measurements User Manual Index–1...
  • Page 105 Multitone Analyzer, purpose, 2–22 Harmonic Analyzer, purpose, 2–13 Multitone Analyzer Main Menu, 2–25 harmonics, frequency selection, 2–13 Multitone Analyzer Specifications, A-5 Harmonics of 50 Hz, 2–13 Harmonics of 60 Hz, 2–14 High Res OFF/ON, 2–10 VM700T Option 40/41/42 Audio Measurements User Manual Index–2...
  • Page 106 (VM700T Command), 3–4 VITS200, 2–35 Show Text, 2–20 VITS201, 2–37 show text display, 2–16 View Audio Auto Test, 2–14 SNR (weighted) (dB), 2–17 View Diff, 2–4, 2–26 soft key (VM700T Command), 3–4 VM700T Option 40/41/42 Audio Measurements User Manual Index–3...
  • Page 107 View Levels, 2–26 soft key, 3–4 View R L, 2–21 VMT, for remote applications, 3–1 View Right, 2–4 View Spectrum, 2–14 Views, LOCKED/UNLOCKED, 2–5 Views LOCKED/UNLOCKED, 2–5 W group keywords, 3–7 VITS200 Checkout, 2–36 VM700T Option 40/41/42 Audio Measurements User Manual Index–4...

Table of Contents