Tektronix 070-8811-08 User Manual
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Tektronix 070-8811-08 User Manual

Tektronix 070-8811-08 User Manual

Digital audio monitor
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User Manual

764
Digital Audio Monitor
(Serial Number B020000 and Above)
070-8811-08
This document supports firmware version 2.1 and
above.
www.tektronix.com

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  • Page 1: User Manual

    User Manual Digital Audio Monitor (Serial Number B020000 and Above) 070-8811-08 This document supports firmware version 2.1 and above. www.tektronix.com...
  • Page 2 Copyright © Tektronix, Inc. All rights reserved. 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. Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077...

  • Page 3: Warranty

    product.

  • Page 4: Table Of Contents

    ........Contacting Tektronix Getting Started .
  • Page 5 Table of Contents Features of the Session Display Session Statistics Session Reports ........The Channel Status View The User Data View Saving and Restoring Setups...
  • Page 6 ..........List of Figures Figure 1: The Tektronix 764 Digital Audio Monitor Figure 2: Rear view of the 764 in a Tektronix enclosure Figure 3: The 764 rear panel and connectors Figure 4: Connecting the standard 764 to your system...
  • Page 7 Table of Contents Figure 21: The 764 phase display Figure 22: The phase correlation meter Figure 23: The 764 AUDIO/SESSION view Figure 24: The SYNC ERR Flags Figure 25: Sync Error Reporting in the Absence of a DAR Figure 26: A short session report Figure 27: Additional data on the long report Figure 28: The Channel Status view, text mode Figure 29: The Channel Status view, binary mode...
  • Page 8 Table 8: Option 01 input submenu, video inputs selected Table 9: Time Code submenu Table 10: Serial Port submenu items Table 11: Save Setups submenu Table 12: Restore Setups submenu Table 13: Screen Saver submenu Table 14: Service submenu Table 15: RS-232 pin assignments Table 16: General remote control commands Table 17: Remote control GET commands Table 18: Remote control PRESS commands...
  • Page 9 Table of Contents 764 Digital Audio Monitor User Manual...

  • Page 10: General Safety Summary

    General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified. Only qualified personnel should perform service procedures. To Avoid Fire or Personal Injury Use Proper Power Cord Use only the power cord set provided with this product, or some...

  • Page 11: Safety Terms And Symbols

    General Safety Summary Use in a Proper Environment Do not operate this product in wet/damp locations/conditions or in explosive atmospheres. Observe All Terminal Ratings To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product.
  • Page 12 General Safety Summary Symbols on the Product The following symbols may appear on the product: Double DANGER Protective Ground ATTENTION Insulated High Voltage (Earth) Terminal Refer to Manual 764 Digital Audio Monitor User Manual...
  • Page 13 General Safety Summary 764 Digital Audio Monitor User Manual...

  • Page 14: Preface

    Preface The Tektronix 764 Digital Audio Monitor shown in Figure 1 is a tool for monitoring the signal levels and stereo phase of digitally-encoded (AES/EBU and IEC 958 “consumer use”) audio in a production environment. The instrument can simultaneously display the levels of two two-channel inputs, and the stereo phase relationship of any two of the four input channels.

  • Page 15: Contacting Tektronix

    This phone number is toll free in North America. After office hours, please leave a voice mail message. Outside North America, contact a Tektronix sales office or distributor; see the Tektronix web site for a list of offices. 764 Digital Audio Monitor User Manual...

  • Page 16: Getting Started

    764 without an enclosure (cabinet). To ensure proper cooling, electromagnetic shielding, and protection against accidental electrical shock, install the instrument in the Tektronix enclosure that best suits your application. NOTE. The Tektronix 764 meets EMI/EMC standards when shielded...

  • Page 17: Connecting The 764 To Your System

    Property damage or injury may result. Figure 2: Rear view of the 764 in a Tektronix enclosure Connecting the 764 to Your System Except for the headphone jack, all connectors are on the rear panel of the 764, shown in Figure 3.

  • Page 18: Digital Audio Inputs And Loop-Throughs

    Figure 3: The 764 rear panel and connectors (1) Digital Audio Inputs and Loop-Throughs The 764 has two, two-channel digital audio inputs, one labeled CH 1–2, and the other labeled CH 3–4. Each input in the standard instrument has two passive loop-throughs that allow you to switch the instrument off with no effect on the through signal: H Balanced XLR connectors for signals conforming to the AES/EBU (AES3-1992) standard.

  • Page 19: Figure 4: Connecting The Standard 764 To Your System

    These inputs have no provision for internal termination; if the 764 is placed at the end of a signal path, install a 75 Ω end-line termination (Tektronix part number 011-0102-00) on the unused loop-through connector. An RCA phono plug-to-BNC male cable or adapter may be required to input consumer digital audio.

  • Page 20: Time Code Inputs

    Getting Started NOTE. The balanced (XLR) loop-throughs are the default 764 inputs. To receive a signal through the unbalanced (BNC) loop-throughs or the optional serial video loop-through (Option 01), you must first reconfigure the instrument through the on-screen menus. Refer to Initial Power Up and Configuration on page 9 for instructions.

  • Page 21: Rs-232 Communications Port

    Refer to Remote Control Commands, beginning on page 66, for more information. H Download future 764 software upgrades through a personal computer. Please contact your Tektronix representative, or the nearest Tektronix office, for information about software upgrades. Installation instructions are provided with each upgrade kit.

  • Page 22: Optional Serial Video Loop-Through

    Getting Started Via RS-232 Print or Store Tektronix 764 Monitor Printer Computer Figure 6: Outputting a session report (6) Optional Serial Video Loop-Through Instruments equipped with Option 01 (Embedded Audio Input) have two additional 75 Ω BNC connectors, SER. VIDEO IN and SER.

  • Page 23: Supplying Power

    250 V at 50 to 60 Hz. If the power cord supplied with your instrument is incorrect for your local AC supply, please contact your nearest Tektronix representative or field office. WARNING. Line voltage will be present in the instrument whenever...

  • Page 24: Initial Power Up And Configuration

    Initial Power Up and Configuration Once you have connected a signal source to at least one of the 764 DIGITAL AUDIO inputs, switch the instrument On. When the start-up diagnostics are completed, the instrument will begin operation in the Audio View/Session display. If a signal source is connected through one of the XLR inputs, the program level should be shown in the corresponding meters.

  • Page 25: Figure 9: The Top Menu Help Message

    Getting Started Perform the following steps to select the input types and familiarize yourself with the 764 menu structure: 1. Press the button to enter the TOP MENU. MENU 2. When the 764 is in menu mode, context-sensitive HELP messages. Press MENU help message;...

  • Page 26: Figure 10: Selecting From The Top Menu

    Figure 10: Selecting from the top menu 4. The five buttons immediately to the right of the display are called soft buttons. The printed/molded lines to the left of these buttons serve to associate the buttons with on-screen menu choices or functions.

  • Page 27: Figure 11: The Inputs Submenu

    Getting Started Figure 11: The inputs submenu 6. Turn the multi-function knob to move the menu highlight to the “CH 3–4 input:” line. 7. If desired, change the channel 3–4 input to the BNC connector by pressing the associated soft button. 8.

  • Page 28: Operating Basics

    Consult the text whenever you have a question regarding instrument operation. Because the Tektronix 764 Digital Audio Monitor is intended as a tool for use in a production environment, every effort has been made to keep operation as simple and intuitive as possible.

  • Page 29: Session Reports

    Operating Basics The left portion of the Audio view display always contains four “bar graph” level meters. The right portion contains either a numerical display of session statistics (see Figure 12), or the Phase display (shown in Figure 13). Configure the right side of the Audio view display with the three PHASE DISPLAY buttons: A, B, and SESSION.

  • Page 30: Monitoring The Ancillary Data

    Operating Basics without requiring constant operator attention. When errors and peaks are encountered, they are time-stamped with the active session time code, which makes it easy to return to the part of the program that contains the event of interest. See page 34 for more information. Figure 13: The 764 AUDIO/PHASE view Monitoring the Ancillary Data You can monitor ancillary data contained in the digital audio signal...

  • Page 31: Other Features

    Operating Basics menus), then the VIEW:USER DATA button. You may select a number of User Data view options with the Soft buttons. Refer to The User Data View beginning on page 39 for more information. Other Features With the 764, you can also save up to three instrument configurations (setups) for later recall.

  • Page 32: Figure 14: 764 Front-Panel Controls

    The SESSION button selects a Session Statistics panel, illustrated in Figure 12. Refer to The Session Display beginning on page 29 for more information. Figure 14: 764 front-panel controls METER SCALE buttons. the Audio view level meter scale. The default scale, selected with NORMAL, is illustrated in Figure 12.

  • Page 33: The Level Meters

    Operating Basics LED immediately above the knob will light and a knob icon will appear in the upper-right of the display when the knob is active. MENU button. Press MENU to invoke the display menu and call up context-sensitive help text when a menu is on screen. Soft buttons.

  • Page 34: Figure 15: The 764 Level Meters

    Figure 15: The 764 Level Meters Meter Ballistics (i.e., dynamic response, or attack/decay character- istics of the meters). The meters can emulate the dynamic re- sponse of three common types of analog audio level meter. Choices are VU with the scale extended to permit display of true peaks on the same bar;...

  • Page 35: Figure 16: The Sum And Difference Display Modes

    Operating Basics Figure 16: The sum and difference display modes Peak Program level. mum permissible level for audio program material. The default Peak Program level is –8 dBFS; you may set it to the integer val- ue between 0 (FS) and –30 dBFS that is appropriate to your par- ticular needs.
  • Page 36 H Shape: The upper 20 dB of the scale is linear in dB; the scale is progressively compressed below –20 dBFS. H The upper limit of the meter scale is the anchor for expansion and compression; that is, the top scale number remains the same when you expand or compress the scale.

  • Page 37: Configuring The Level Meters

    Operating Basics Please be aware that although the peak indicators may reveal higher peaks than VU or PPM ballistics, the indicators do act on the same, processed data as the meters. If interpolation is ON, the peak indicators show peaks in the oversampled data, and these peaks may be higher than those in the raw input data (see “Interpolation,”...

  • Page 38: Figure 17: Creating A Custom Meter Scale

    Press METER SCALE:NORMAL to restore the default meter scale; to later restore the “custom” scale and offset, press METER SCALE:CUSTOM. Figure 17: Creating a custom meter scale Level Meter Submenu selections. tion selections are made through the Level Meter submenu. Follow the steps below to make menu selections.

  • Page 39: Figure 18: The Level Meters Submenu

    Operating Basics Figure 18: The Level Meters submenu 5. Again, use the multi-function knob to scroll the menu highlight to the parameter you wish to configure. The soft button assignments will change to reflect your choice of settings. For menu items that have numeric settings, the top two soft buttons become increment/decrement controls designated with up and down arrow icons, as represented in Figure 19.

  • Page 40: Sum And Difference Bars

    (either channels 1 and 2, or channels 3 and 4), and the right-hand bars emulate the sum and difference bars of an analog audio monitor, such the Tektronix 760. Note that the “sum” is actually one-half of the sum of the left- and right-channel data, while the “difference”...

  • Page 41: The Phase Display

    Operating Basics Figure 20: Sum and difference bars and the session display The Phase Display The 764 Phase display is a Lissajous pattern display augmented with a (phase) Correlation meter. It is designed for convenient, qualitative monitoring of the phase relationship between any two input channels. The Phase display always uses interpolated (4X “oversampled”) data, even if interpolation is turned off in the level meters submenu.

  • Page 42: The Lissajous Pattern

    (“straight ahead”) axis. If you are unfamiliar with Lissajous phase patterns and their interpretation, see Tektronix application note 21W-6244-2, “Stereo Audio Measurements Using the 760A Audio Monitor.” The concepts discussed apply to the Lissajous display of the 764 as well.

  • Page 43: Agc

    Operating Basics +1 when the channels contain identical signals (frequency and phase); it will measure –1 when the signals have the same frequency (or frequencies), but are 180 degrees out of phase. A center-scale (0) reading indicates uncorrelated —or random —signals. Figure 22: The phase correlation meter When you monitor audio programs (as opposed to simple test tones) with the 764, the pointer will usually read between +0.5 and +1, and...

  • Page 44: The Session Display

    The Session Display The session display is a dynamic readout of session history; it is illustrated in Figure 23. When the 764 is in Audio view, press the PHASE DISPLAY:SESSION button to toggle between the Phase display and the Session display. Figure 23: The 764 AUDIO/SESSION view Features of the Session Display The following numbered paragraphs correspond to the numbered...

  • Page 45: Session Statistics

    Operating Basics Session time. The instrument time-stamps any errors encountered during the Session with the chosen time code; the information is saved in NVRAM for use when you output a Session report (refer to page 34). (2) Run(ning)/Stop(ped) indicator and soft button assignment. This indicator is associated with the top soft button, immediately be- low the MENU button.
  • Page 46 H Number of CLIPs detected during the session. This is directly affected by the “Consecutive FS Samples for CLIP” setting in the Level Meters submenu. H Number of MUTEs detected during the session. Affected by the “Consecutive ‘0’ Samples for Mute” setting in the Level Meters submenu.

  • Page 47: Figure 25: Sync Error Reporting In The Absence Of A Dar

    Operating Basics SYNC ERR flags as shown in Figure 24. Please see the following paragraphs for more information. Figure 24: The SYNC ERR Flags H Frame Synchronization Error — for each input with respect to the Digital Audio Reference (DAR), when one is present at the REFERENCE input.
  • Page 48 Operating Basics displays under the meter bars of the unsynchronized input. Figure 24 shows the flags as they would appear if each input signal preceded or followed the DAR signal by more than 25% of a frame. The SYNC ERR flags also appear when the input signal sample frequency varies from the reference frequency by 0.01 kHz or more.

  • Page 49: Session Reports

    You can print reports on a serial printer, or save them to files on an IBM-compatible Personal Computer (PC). The 764 can generate two types of session report, short (Figure 26) and long (Figure 27). Tektronix 764 Session Screen Report ---------------------------------------------------------------------------- Title____________________________________________________Date_______________ Time Code used: Session HH:MM:SS...

  • Page 50: Figure 27: Additional Data On The Long Report

    The short report, shown in Figure 26, is a record of what happened during the session. It contains a print-out of the statistics tabulated on the 764 Session display, and lists several instrument settings that can affect meter behavior. In addition to all the information in the short report, the long report contains time-stamped peak and error data and gives more detail about active bits, DC offset, and sample rates.
  • Page 51 Operating Basics There are two types of time-stamped information, peak readings and error events. Peak readings are the highest true peak and the highest meter reading encountered during each consecutive peak reading interval in the session. An error event is a clip, mute, invalid sample, parity error, or code violation episode, consisting of at least one such error.

  • Page 52: The Channel Status View

    The Channel Status View The 764 Channel Status view displays the channel status information that is embedded in AES3-1992 (professional) or IEC-958 (consum- er) digital audio signals. Press CLEAR MENU (if necessary to exit a menu), then the VIEW:CH. STATUS button to select the Channel Status view.

  • Page 53: Figure 29: The Channel Status View, Binary Mode

    Operating Basics H In binary display mode (illustrated in Figure 29), you may turn the multi-function knob to highlight various bits or blocks of bits for same-screen “plain English” decoding. For example, bits 3 through 5 of byte 0 indicate the (pre)emphasis, if any, that has been applied to the audio program;...

  • Page 54: The User Data View

    The User Data View The 764 User Data view is intended to display optional user information that may be embedded in the “user bits” of digital audio signals. As this is written, the 764 can only interpret and display data that is block-aligned with the Channel status data;...

  • Page 55: Saving And Restoring Setups

    Operating Basics Saving and Restoring Setups The 764 automatically stores current front panel and menu settings in non-volatile RAM. The instrument restarts every time in the Audio View/Session Display, with the session stopped and session time (if it is the current Time Code selection) reset to zero. All other settings will be as when the 764 was switched off.

  • Page 56: Editing A Setup

    been restored” —will appear on screen to signal that the operation is complete. 4. Press CLEAR MENU to resume normal instrument operation with the newly-recalled settings. Figure 31: The Restore Setups submenu Editing a Setup To edit an existing, saved setup: 1.
  • Page 57 Operating Basics 764 Digital Audio Monitor User Manual...

  • Page 58: Reference

    Reference This section contains detailed information about the more technical aspects of 764 operation. The subsections are: Level Meters, Correlation Meter Algorithm, Selecting Headphone Channels, Submenus, and Using the RS-232 Port. Level Meters Also refer to The Level Meters Submenu beginning on page 48. Meter Ballistics and Alignment Levels The many level meter options in the 764 may leave the user wondering which settings to use for a given installation or applica-...

  • Page 59: In-Bar Warning Messages

    Reference always indicated by the peak segment, so actual headroom is always visible. With VU ballistics, the Test Level should correspond to the same level as above (–18 dBFS) if program exchange is important. In accordance with standard practice, the Test Level (“line–up level”) corresponds to 0 VU, so you may set the 0 dB mark to the Test Level.

  • Page 60: Figure 32: An "In-Bar" Warning Message

    Reference CODE ERR — A bi-phase coding violation (ERRor) has occurred in the digital data stream. All affected data samples are unreliable, and are therefore ignored. The instrument treats affected samples as “zero samples” for use by the meter bars and phase display. When Session is running, the instrument counts code violations and displays the total on the Session view.

  • Page 61: Correlation Meter Algorithm

    Reference V BIT — Indicates that the Validity bit is set high for one or more data samples. In the AES/EBU standard, a set validity bit indicates that the sample is not suitable for conversion to audio. By default, The meter bars and phase display treat the affected samples as a zero samples.

  • Page 62: Table 1: Correlation Meter Speed Averaging Intervals

    (sign) + ( ) 1 ) if (sign) + ( –1 ) if The actual correlation meter reading is the “rolling average” of the last i sample blocks: ), . . . , ) C where i is determined by the Correlation Meter Speed setting in the Phase Display submenu.

  • Page 63: Selecting Headphone Channels

    Reference Selecting Headphone Channels By factory default, the headphone output follows the phase display. That is, you can listen to the audio programs that are currently driving the Lissajous pattern and Correlation meter (refer to The Phase Display beginning on page 26). When you change the phase display channels —either by selecting the other display pair (A or B), or through the phase display menu —the headphone output will contain the audio on the newly-selected input channels.

  • Page 64: Table 2: Level Meters Submenu

    Table 2: Level Meters submenu Item Display Mode Interpolation Ballistics Peak Hold Time Peak Program Level (dBFS) Test Level (dBFS) Set 0 dB Mark to Consecutive FS Sam- ples for CLIP Consecutive “0” Sam- ples for MUTE CLIP/MUTE Hold Time (sec) Ignore Validity Bit Suppress Sync Loss...

  • Page 65: Figure 33: The "Interpolation Off" Message

    Reference or channels 3–4); the right-hand bars show (L+R)/2 (Sum) and (L–R)/2 (Diff) data derived from the two left-hand bars. The Sum and Difference bars use the same scale and ballistics, and all other settings, as the channel level meters. Interpolation.
  • Page 66 H Extended VU, a VU meter as defined in IEEE 152–1991, but with an extended dB-linear scale. The 764 meter bars will also contain true peak indicators when Extended VU is selected, and the display designation of this setting is “vu + Peak.” Note that this setting only affects meter performance when the input is “live,”...
  • Page 67 Reference page 19) appears in a level meter, and it also affects the number of clips detected during a Session and included in a session report (refer to The Session Display beginning on page 29). The range for this setting is 0 to 100; a setting of 0 turns mute detection Off, in which case no mutes will be reported on the session display or in a session report.

  • Page 68: The De-Emphasis Submenu

    The De-emphasis Submenu The De-emphasis submenu, shown in Table 3, lets you select the appropriate de-emphasis for each of the four input channels. Enter the De-emphasis submenu from the TOP menu level by scrolling the highlight to the De-emphasis item and pressing a soft button. Then scroll the highlight to the desired channel.

  • Page 69: Table 4: Phase Display Submenu

    Reference Figure 34: The De-emphasis flags The Phase Display Submenu Use the Phase Displaly submenu (Table 4) to configure the appear- ance and behavior of the Audio View Phase display. Table 4: Phase Display submenu Item Format Correlation Meter Speed 1 to 20 Pair A Left channel as- signment Pair A Right channel...
  • Page 70 display orientation. Refer to page 26 for details on the phase display formats. Correlation Meter Speed. determines how quickly the meter reacts to changes in phase relationship. The meter reading is actually an average of correlation over time, and this setting determines how many samples are used to calculate the average.

  • Page 71: Headphones Submenu

    Reference Headphones Submenu Use the Headphonse submenu (Table 5) to determine the input channels to be decoded and output through the headphone jack. Table 5: Headphones submenu Item Audio Source Manual Left Channel Manual Right Channel Input Submenu Select the active connectors for the digital audio and reference inputs through this submenu.

  • Page 72: Table 9: Time Code Submenu

    Table 7: Option 01 input submenu, audio inputs selected Item Audio Source CH 1–2 input CH 3–4 input Reference input Table 8: Option 01 input submenu, video inputs selected Item Audio Source Channels Time Code Submenu Select the time code to be displayed on the Session Display and used to time-stamp errors on Session reports.

  • Page 73: Serial Port Submenu

    Reference Serial Port Submenu The Serial Port submenu contains items used for setting the serial port parameters and controlling the content of the session report. The items and choices are listed in Table 10 and explained in the subsequent paragraphs. Table 10: Serial Port submenu items Item Flow Control...

  • Page 74: Save Setups Submenu

    Peak Reading Interval (sec). peak reading intervals. When a session is running, the 764 stores the time and value of the highest true peak and meter bar readings encountered during each interval. The time-stamped peaks are included in a long report; see Figure 27 (on page 35). H This setting does not apply to error events (clips, mutes, Invalid samples, Parity Errors, and Code Violations).

  • Page 75: Restore Setups Submenu

    Reference Restore Setups Submenu Restore a previously saved instrument configuration through the Restore Setups submenu (Table 12). The current instrument settings will be replaced by those in the saved Setup. Table 12: Restore Setups submenu Item Selection Screen Saver Submenu Select a suitable delay in the Screen Saver submenu (Table 13) to help prevent display “burn in.”...

  • Page 76: Service Submenu

    Service Submenu Use the Service submenu (Table 14) to select patterns for use in adjusting the display; find the version of software installed in the instrument and the instrument’s firmware identification number; and superimpose a numeric readout of signal levels on the Session display.

  • Page 77: Using The Rs-232 Port

    When communicating with a DTE device that has a male 9-pin (DB9) connector, use a cable that connects pins 2, 3, 5, 7, and 8 straight-through (example: Tektronix part number 012-1445-00). To communicate with another DCE device, use a null modem cable (which swaps the lines between pins 2 and 3 and pins 7 and 8).

  • Page 78: Figure 35: Connecting To A Dte Device With A Db25 Serial Port

    Reference NOTE. RS-232 signals are named from the perspective of the DTE device. Since the 764 is a DCE device, pin 2 (Received Data) is an output from the instrument; that is, the data is received by the connected DTE device. The 764 supports both hardware (RTS/CTS) and software (Xon/Xoff) handshaking;...

  • Page 79: Figure 36: Connecting To A Dce Device With A Db25 Serial Port

    PC running Microsoft Windows 3.1. You may find the examples helpful; please note, however, that mention of third-party software or equipment does not constitute endorsement or recommendation by Tektronix, Inc. The settings required for your particular printer, PC, and communications software may vary. Printing.
  • Page 80 H Printer Communications Settings: ESP (automatic protocol sensing) 9600 (baud) 8 (bits) 1 (stop bit) DTR/DSR (flow control) H 764 Serial Port settings: Flow Control = HARDWARE Baud Rate = 9600 Communicating with a PC. to establish communications with a personal computer. H PC Software: Microsoft Windows 95 Hyperterminal Accessory application.

  • Page 81: Outputting A Session Report

    Reference Outputting a Session Report You can test your RS-232 connection by outputting a short session report. 1. Confirm that the Copy selection of the 764 Serial Port submenu is set to either SHORT REPORT or LONG REPORT. 2. Clear the on-screen menu and display the Audio Session view. 3.

  • Page 82: Table 16: General Remote Control Commands

    The example command gets the time, gets the sample rate from the Channel 3 – Channel 4 input, and presses the View Audio button. When you abbreviate a command, you cannot leave out letters in the middle of a command argument. If the complete argument is needed to make a command unique, all the argument alphanumerics must all be used.

  • Page 83: Table 17: Remote Control Get Commands

    Reference Table 16: General remote control commands (Cont.) Command MSGON:<text> MSGOFF SYSTEM:ERROR SYSTEM:ERROR:CLEAR GET Commands. GET commands retrieve information from the 764; Table 17 lists and explains the GET commands. Table 17: Remote control GET commands Command GET:? GET:mnemonic GET:TIME GET:FRAME:<0–1>...
  • Page 84 Table 17: Remote control GET commands (Cont.) Command GET:WARFLAG:<0–3> GET:CURTP:<0–3> GET:SPEAK:<0–3> GET:RAWTP:<0–3> GET:CURHP:<0–3> GET:SHIGH:<0–3> GET:RAWHP:<0–3> GET:FILESPACE GET:LREPORT GET:SREPORT 764 Digital Audio Monitor User Manual Value = selection Retrieves 0=Meter bar #1 Warning flags 1=Meter bar #2 2=Meter bar #3 3=Meter bar #4 0=Meter bar #1 Current true peak 1=Meter bar #2...

  • Page 85: Table 18: Remote Control Press Commands

    Reference PRESS Commands. Each front-panel button (except the power switch) has an equivalent PRESS:<button> command. Send the command to perform the same action as pressing the button. Table 18: Remote control PRESS commands Command PRESS:? PRESS:APH PRESS:AUDIO PRESS:BPH PRESS:CHSTAT PRESS:CLEAR PRESS:CUSTOM PRESS:EXPAND PRESS:NORMAL...

  • Page 86: Table 19: Remote Control Menu Commands

    MENU Commands. Use the MENU commands listed in Table 19 to make selections from the 764 on-screen menus. The menus need not be visible on the display to change a setting with a MENU command. Table 19: Remote control MENU commands Command Value = setting MENU:?
  • Page 87 Reference Table 19: Remote control MENU commands (Cont.) Command Value = setting MENU:SYNCF:<0–1> 0=NO 1=YES MENU:DEEMP1:<0–3> 0=None 1=Auto 2=CCITT J.17 3=50/15 MENU:DEEMP2:<0–3> 0=None 1=Auto 2=CCITT J.17 3=50/15 MENU:DEEMP3:<0–3> 0=None 1=Auto 2=CCITT J.17 3=50/15 MENU:DEEMP4:<0–3> 0=None 1=Auto 2=CCITT J.17 3=50/15 MENU:PDISP:<0–1> 0=Lissajous–Soundstage 1=Lissajous–XY MENU:CORR:<1–20>...
  • Page 88 Table 19: Remote control MENU commands (Cont.) Command Value = setting MENU:PBRIGHT:<0–3> 0=channel #1 1=channel #2 2=channel #3 3=channel #4 MENU:AUDSRC:<0–1> 0=Manual 1=Auto (follows phase) MENU:MLEFT:<0–3> 0=channel #1 1=channel #2 2=channel #3 3=channel #4 MENU:MRIGHT:<0–3> 0=channel #1 1=channel #2 2=channel #3 3=channel #4 MENU:SOURCE:<0–1>...
  • Page 89 Reference Table 19: Remote control MENU commands (Cont.) Command Value = setting MENU:BAUD:<0–3> 0=38400 1=19200 2=9600 3=2400 MENU:COPY:<0–2> 0=No Report 1=Short Report 2=Long Report MENU:PR–INT:<0–300> 0 to 300 seconds MENU:SAVE:<0–2> 0=Setup #1 1=Setup #2 2=Setup #3 MENU:RESTORE:<0–3> 0=Setup #1 1=Setup #2 2=Setup #3 3=Factory Setup MENU:SCRSVR:<0–23>...

  • Page 90: Appendix A: Specifications

    Appendix A: Specifications Table 20: Digital audio inputs Characteristic Performance require- ments Impedance Balanced inputs (XLR) 110 Ω ± 5% Term switched in Term switched out Return loss >30dB Unbalanced inputs Return loss > 30dB Input level Balanced inputs 0.2 to 10 V Unbalanced inputs 50 mV Reference input...

  • Page 91: Table 23: Interface Parameter Measurements

    Appendix A: Specifications Table 21: Level Meters and Phase Display Characteristic Performance require- ments Attack and Decay Characteristics: True Peak PPM decay characteristics No attack delay per IEC 268-10A and IEEE std. 152-1991 per IEEE std. 152-1991 ± 0.05 dB Level Meter accuracy AGC Control Range 0 dBFS to –40 dBFS...

  • Page 92: Table 24: Headphone Output

    Table 23: Interface parameter measurements (Cont.) Characteristic Performance require- ments Accuracy Within .01 kHz Synchronization ± 40% of dig. audio frame Range ± 2% of digital audio frame Accuracy Indication Table 24: Headphone output Characteristic Performance require- ments u10 V Output voltage 20 Hz to 20 kHz ±...

  • Page 93: Table 26: Physical Characteristics

    Appendix A: Specifications Table 25: VGA output (Cont.) Characteristic Information Load Impedance 75 ohms Green 75 ohms Blue 75 ohms Horizontal Sync TTL compatible Vertical Sync TTL compatible Timing/Frequency Dot Clock 25.175 MHz Horizontal Rate 31.469 kHz Vertical Rate 59.940 Hz Pin Assignments pin: Green...

  • Page 94: Table 28: Environmental Characteristics

    55 to 7 Hz in five-minute cycles with the instrument attached to a vibration platform Dwell for 10 minutes each axis at any resonant frequency, or 33 Hz if no resonant frequency is found (Tektronix std. 062-2858-00). Shock (non-operating)c 30 Gs,...

  • Page 95: Table 29: Certifications And Compliances

    Appendix A: Specifications Table 28: Environmental characteristics (Cont.) Characteristic Information Transportation Meets the requirements of NTSB Test Procedure 1A, category II (24 inch drop) Equipment Type Measurement Equipment Class Class I (grounded product) (As defined in IEC 1010-1, Annex H.) Installation Category Installation Category II (as defined in IEC 1010-1, Annex J)
  • Page 96 Table 29: Certifications and compliances (Cont.) Australia/New Complies with EMC provision of Radiocommunications Act per Zealand Declaration the following standard(s): of Conformity – AN/NZS 2064.1/2 Medical Equipment: 1992 EC Declaration of Compliance was demonstrated to the following specification as Conformity – Low listed in the Official Journal of the European Communities: Voltage Low Voltage Directive 73/23/EEC, Amended by 93/68/EEC:...
  • Page 97 Appendix A: Specifications 764 Digital Audio Monitor User Manual...

  • Page 98: Appendix B: Error/Warning Messages

    Appendix B: Error/Warning Messages This appendix lists and explains the various error and warning messages that can appear on the 764 display. Figure 32 on page 45 shows the In-bar message location. Channels not synchronized Location: Audio View, phase display. The left and right samples are not synchronized well enough to be reliably paired.
  • Page 99 Appendix B: Error/Warning Messages CODE ERR Location: In-bar. (Code error.) A bi-phase coding violation has occurred in the digital data stream. All affected data samples are unreliable, and are therefore ignored. The instrument treats affected samples as “zero samples” for use by the meter bars and phase display. The CODE ERRor indicator persists for the “CLIP/MUTE Hold Time,”...
  • Page 100 Appendix B: Error/Warning Messages INPUT UNLOCKED Location: In-bar. The 764 is not locked to an incoming signal on the indicated input channel. Data cannot be decoded; all data and all other errors are ignored. Likely causes of this message include: missing input signal; incorrect setting(s) in the Inputs submenu;...
  • Page 101 Appendix B: Error/Warning Messages MUTE Location: In-bar. The MUTE indicator flashes when the digital audio data on the input channel remains at zero-value for n or more consecutive samples. The factory default value of n is ten (10); it may be changed through the Level Meters submenu.
  • Page 102 Appendix B: Error/Warning Messages NOT PRESENT (Option 01 only) Location: In-bar. The NOT PRESENT flag indicates that, although video input is detected, there is no active audio on the corresponding channel (no channel ID is detected). PARITY Location: In-bar. The incoming subframe does not have even parity as specified by the applicable digital audio standards.
  • Page 103 Appendix B: Error/Warning Messages To determine the exact cause of a SYNC ERR flag, select the 764 Session display and check the Sample Rate and Frame Sync Err fields in the SESSION STATISTICS panel. See The Session Display on page 29 for more information. The flag will persist until synchronization is achieved, or until “Suppress Sync Loss Flags”...

  • Page 104: Appendix C: Options

    Appendix C: Options This section describes the following options available with the 764 Digital Audio Monitor: H Option 01, Embedded Audio Input H Option 02, Analog Line Output (see page 93) H Power cord options (see page 99) Embedded Audio Input (Option 01) Option 01 provides the ability to monitor AES/EBU digital audio that is embedded in serial digital video.

  • Page 105: Operating Information

    Appendix C: Options Table 30: Option 01 characteristics (Cont.) Characteristic Equalization range Return loss (input and output) Output level Operating Information The following paragraphs explain how to monitor embedded audio with a 764 Digital Audio Monitor equipped with Option 01. Most procedures are the same as those used for monitoring digital audio with a standard instrument;...

  • Page 106: Figure 37: The Audio View With Digital Video Input Selected

    5. Turn the multi-function knob to highlight the Channels menu item; then press the soft button that corresponds to the channel group (channels 1–4; 5–8; 9–12; or 13–16) that you want to monitor. If you do not know which audio channels are active on the input video, ignore the channel setting and proceed to the next step.

  • Page 107: Changes To The Session Statistics Display

    Appendix C: Options above to select a group with active audio channels; then press CLEAR MENU to return to the audio view. Configure the Meters. Once you have selected the correct channel group, you can configure the level meter scale and offset by following the instructions under Configuring the Level Meters on page 22.

  • Page 108: Analog Line Output (Option 02)

    NOT PRESENT. The in-bar NOT PRESENT flag indicates that, although video input is detected, there is no active audio on the corresponding channel (no channel ID is detected). Analog Line Output (Option 02) Option 02 replaces the balanced XLR digital audio outputs with analog audio line outputs;...

  • Page 109: Table 31: Option 02 Characteristics

    Appendix C: Options Option 02 instruments are set during manufacture for fixed output; refer to Configuring the Output on page 95 for information about changing the setting. When outputting to an unbalanced load (0 to 2.0 V output only), you must connect one of the lines to ground; refer to Connecting the Instrument on page 97 for more information.

  • Page 110: Configuring The Output

    Configuring the Output Qualified service personnel can change the output configuration with the following procedure: CAUTION. The 764 contains static-sensitive components. The following procedure should be performed by qualified technicians only. 1. Disconnect power and all other connections from the 764 rear panel and then remove the instrument from its enclosure.
  • Page 111 Appendix C: Options 3. Locate J913 and J914, the two rows of six connector pins on the AES circuit board assembly. The AES board is on the right side of the 764 when you view the instrument from the rear panel; J913 and J914 are near the end of the AES board that is closest to the front of the instrument.

  • Page 112: Connecting The Instrument

    Appendix C: Options Connecting the Instrument The appropriate method of connecting the Option 02 analog outputs to your system depends on the configured output level and the requirements of your particular installation. High-level, Balanced Output. When using high-level fixed or variable balanced output, connect the 764 to your system with standard shielded XLR cables.

  • Page 113: Figure 40: Connecting To An Unbalanced Input

    Appendix C: Options Analog line output XLR Pin 3 (–) Pin 1 (shield) Pin 2 (+) Pin 2 (+) Pin 3 (–) Pin 1 (shield) Figure 40: Connecting to an unbalanced input NOTE. Connecting a line to ground as shown in Figure 40 forces the analog outputs into unbalanced mode.

  • Page 114: Power Cords

    Power Cords Table 33 lists and describes the available power cord options. Please contact your Tektronix representative if the power cord supplied with your instrument is not correct for the local power supply. Table 33: Power cord identification Plug configuration...
  • Page 115 Appendix C: Options 764 Digital Audio Monitor User Manual...

  • Page 116: Glossary

    Glossary CLIP One or more consecutive positive or negative full scale samples. The actual number of consecutive samples that constitute a CLIP may be adjusted through the Level Meters submenu; the factory setting is one (1). Copy Output a session report via the rear-panel RS-232 port. Frame Sync Err Frame synchronization error between the input pair and the reference, as a percentage of the digital audio frame.
  • Page 117 Glossary Test Level Also called “alignment” or “reference” level. Usually, the signal level used for system alignment. In the 764, this setting determines the placement of level meter markers and a meter bar intensity/color threshold. 764 Digital Audio Monitor User Manual...

  • Page 118: Index

    CLIP flag, 22 CLIPs flag persistence, 52 samples required, 51 Command abbreviation, 66 syntax, 66 Contacting Tektronix, xii controls, 16 BRIGHTNESS knob, 18 CLEAR MENU button, 18 MENU button, 10, 18 METER SCALE buttons, 17 EXPAND, 17 764 Digital Audio Monitor User Manual...
  • Page 119 Index Get commands, 68 headphones, 7 selecting channels, 48 Headphones submenu, 48, 56 IEEE 152-1991, 44 Ignore Validity Bit, 52 Inputs digital audio, 3 configuring, 10 LTC, 5 reference, 5 RS-232, 6 SER. VIDEO (Option 01), 89 submenu, 56 VITC, 5 interpolation (oversampling), 50 knob icon, 10 knobs...
  • Page 120 channel pairing, 16 format, 26, 54 submenu, 54 PPM (meter ballistics), 43 Press commands, 70 Product Support, xii reference inputs, 5 reference level, 44 See also test level Remote command abbreviation, 66 command syntax, 66 control, 6, 62, 66 RESET Session soft button, 30 Restore Setups submenu, 40, 60 RS-232 communications port, 6, 62 Save Setups submenu, 40, 59...
  • Page 121 Index User Data view, 15, 39 Validity Bit, ignore, 52 VGA video output, 5 VIEW buttons, 16 Views Audio, 13 Channel Status, 15 User Data, 15 VOLUME knob, 18 VU (meter ballistics), 44 warning messages CODE ERR, 45, 84 Interpolation OFF, 50 LOW CONF, 45, 85 MUTE, 21 NO INPUT, 44, 85, 86...

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