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.
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 TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Warranty Tektronix warrants that the 764 Digital Audio Monitor will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.
Table of Contents General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Contacting Tektronix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi xi xii Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unpacking . . . . . . . . . .
Table of Contents ii Features of the Session Display . . . . . . . . . . . . . . . . . . . . . Session Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Session Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Channel Status View . . . . . . . . . . . . . . . . . . . . . . . . . . . . The User Data View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Saving and Restoring Setups . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents Operating Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . Changes to the Session Statistics Display . . . . . . . . . . . . . Additional Error/Warning Messages . . . . . . . . . . . . . . . . . Analog Line Output (Option 02) . . . . . . . . . . . . . . . . . . . . . . . Configuring the Output . . . . . . . . . . . . . . . . . . . . . . . . . . . Connecting the Instrument . . . . . . . . . . . . . . . . . . . . . . . . Power Cords . . . . . . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . .
Contents 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 of Contents vi 764 Digital Audio Monitor User Manual
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 other properly rated and approved cord set configured for the local mains supply outlets.
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. Safety Terms and Symbols Terms in this Manual These terms may appear in this manual: WARNING.
General Safety Summary Symbols on the Product The following symbols may appear on the product: DANGER High Voltage Protective Ground (Earth) Terminal 764 Digital Audio Monitor User Manual ATTENTION Refer to Manual Double Insulated ix
General Safety Summary x 764 Digital Audio Monitor User Manual
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.
Preface H Operating Basics — What you’ll need to know for day-to-day operation of the 764. Begins on page 13. H Reference — Begins on page 43. H Appendices — Instrument characteristics; Options/Accessories; User Service. Begin on page 75. H Glossary — Begins on page 101. H Index — Begins on page 103. Contacting Tektronix Phone 1-800-833-9200* Address Tektronix, Inc. Department or name (if known) 14200 SW Karl Braun Drive P.O. Box 500 Beaverton, OR 97077 USA Web site www.tektronix.
Getting Started This section contains information you’ll need to put your 764 Digital Audio Monitor into service. For a detailed description of instrument capabilities, and instructions for its use, refer to the Operating Basics section of this manual. Unpacking Please save the packaging material in case you must later ship the instrument for calibration or service.
Getting Started Order the appropriate enclosure through your nearest Tektronix field office or representative. WARNING. Do not carry an instrument in one of the optional enclosures without first installing the cabinet mounting screws as shown in Figure 2. Without the mounting screws, an instrument can slip out of its cabinet if tipped forward. Property damage or injury may result.
Getting Started 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.
Getting Started NOTE. The male XLR connectors of instruments equipped with Option 02 (Analog Line Output) are labeled ANALOG OUT; these instruments do not have provision for loop-through on the balanced XLR connectors. The balanced XLR inputs of Option 02 instruments are unterminated when the associated TERM switches are set to EXT. To avoid signal degradation, always leave the TERM switches of Option 02 instruments set to 110 Ω. Refer to Appendix C: Options for more information about Option 02.
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. (2) Time Code Inputs VITC — Reads vertical interval time code from NTSC or PAL analog video per IEC publication 461 specifications.
Getting Started VGA or SVGA Monitor Tektronix 764 Monitor From VGA VIDEO Output Figure 5: Using an external color monitor (5) RS-232 Communications Port Through the RS-232 port, you can: H Output a record of the input signal and program, either to an ASCII printer or a personal computer (see Figure 6) running a communications application, such as PROCOMM or the Terminal accessory of Microsoft Windows. Refer to Session Reports beginning on page 34.
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. VIDEO OUT. These connectors make up a loop-through that accepts digital video with embedded digital audio. Refer to Appendix C: Options, beginning on page 89, for more information about Option 01.
Getting Started Figure 7: The headphone output (schematic) By factory default, the headphone output automatically follows the phase display; that is, it contains the audio programs decoded from the two channels that you are monitoring with the Lissajous pattern and correlation meter. You may also choose to listen to any two of the input channels, independent of the phase display choices; for instructions, refer to Selecting Headphone Channels on page 48.
Getting Started 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.
Getting Started Perform the following steps to select the input types and familiarize yourself with the 764 menu structure: 1. Press the MENU button to enter the TOP MENU. 2. When the 764 is in menu mode, MENU provides access to context-sensitive HELP messages. Press MENU now to see the TOP MENU help message; the display resembles Figure 9. Press the button again to clear the message. Figure 9: The top menu HELP message 3.
Getting Started 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. In Figure 10, the bottom soft button is associated with the SUBMENU function, but you can press any soft button to enter the Inputs submenu.1 After you do, the display resembles Figure 11. 5.
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. Press the CLEAR MENU button to exit the menus and resume normal operation. If you have selected the appropriate input type, the corresponding level meters should now respond to the input audio program.
Operating Basics This section contains the basic information needed to use your 764. The subsections are: Overview, Front Panel Controls, The Level Meters, The Phase Display, The Session Display, Session Reports, The Channel Status View, The User Data View, and Other Features. Please take a few minutes to familiarize yourself with this section and the information contained in it. Consult the text whenever you have a question regarding instrument operation.
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. Figure 12: The 764 AUDIO/SESSION view The 764 has many options that affect the appearance and behavior of the Audio view features.
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 through two additional 764 view options. Channel Status View.
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. Refer to page 40. Front-panel Controls Figure 14 shows the 764 front panel controls. (1) POWER switch. Press the POWER switch to toggle between ON and STANDBY.
Operating Basics 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 (4) METER SCALE buttons. Use the METER SCALE buttons to change the Audio view level meter scale. The default scale, selected with NORMAL, is illustrated in Figure 12. Use EXPAND and OFFSET—with the multi-function knob —to configure the range and offset of the custom scale.
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. (6) MENU button. Press MENU to invoke the display menu and call up context-sensitive help text when a menu is on screen. (7) Soft buttons. The five white soft buttons are used to select choices or toggle settings that are indicated on the CRT display. In Figure 12, for example, the top soft button is used to toggle the Session between Run and Stop.
Operating Basics Figure 15: The 764 Level Meters (1) Meter Ballistics (i.e., dynamic response, or attack/decay characteristics of the meters). The meters can emulate the dynamic response 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; PPM, a quasi-peak meter with 10 ms integration time and slow decay; and True Peak, with instantaneous response and slow decay. (2) Scale Units (dBFS or dBr).
Operating Basics Figure 16: The sum and difference display modes (3) Peak Program level. The Peak Program level is usually the maximum permissible level for audio program material. The default Peak Program level is –8 dBFS; you may set it to the integer value between 0 (FS) and –30 dBFS that is appropriate to your particular needs.
Operating Basics 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. H The lower limit (bottom) of the scale cannot be adjusted below –90 dBFS; the upper limit (top) cannot be higher than 0 dBFS, or lower than –20 dBFS. (6) Mute indicator (and other messages).
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,” on page 50). If de-emphasis (AUTO, CCITT J.
Operating Basics 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. All remaining level meter configura- tion selections are made through the Level Meter submenu. Follow the steps below to make menu selections. As with meter scale, all selections apply to all four input channels, and all four meter bars. 1.
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. Figure 19: Soft buttons and numeric settings 6.
Operating Basics the button down —or until you reach an adjustment limit.) Changes are confirmed by changed text after the parameter name in the submenu column on the left side of the screen. 7. Repeat steps (5) and (6) until you have configured the meters to suit your needs. 8. Press the TOP MENU soft button to return to the top menu, or press CLEAR MENU to exit the menus and resume normal operation.
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.
Operating Basics Figure 21: The 764 phase display The Lissajous Pattern The Lissajous portion of the phase display is a plot of one channel against another on an orthogonal pair of axes. The X–Y orientation—shown on the right in Figure 21 —plots left channel data along the vertical axis and right channel data on the horizontal axis, emulating the conventional X–Y display of an oscilloscope.
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 will move as the correlation between the two channels changes.
Operating Basics 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 features visible in Figure 23. (1) Time readout in hours:minutes:seconds:frames. By default, this is “Session time.
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 below the MENU button. The current state is highlighted. Run means that the Session is running, and statistics are accumulating.
Operating Basics 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. H Number of invalid samples encountered during the session. The 764 counts a sample as invalid when its validity bit is set high.
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. Otherwise —when both inputs are active but no DAR is present —the error of input 3–4 relative to input 1–2, as depicted in Figure 25. Errors are expressed as the percentage of a complete digital audio frame.
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.
Operating Basics Session Reports The 764 can output the data collected during a session —in the form of ASCII text session Reports, through the rear-panel RS-232 connector. 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).
Operating Basics 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.
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.
Operating Basics The Channel Status View The 764 Channel Status view displays the channel status information that is embedded in AES3-1992 (professional) or IEC-958 (consumer) digital audio signals. Press CLEAR MENU (if necessary to exit a menu), then the VIEW:CH. STATUS button to select the Channel Status view. You can choose to display the Channel Status in one of four formats: fully decoded text (the default, illustrated in Figure 28), binary (Figure 29), transmission-order binary, or hexidecimal.
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; when you move the screen highlight to those bits, the type of emphasis will be displayed in decoded text near the bottom of the screen.
Operating Basics 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; the 764 cannot interpret IEC-908 (Compact Disk) user data. Press CLEAR MENU (if necessary to exit a menu), then the VIEW:USER DATA button to select the User Data view.
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.
Operating Basics 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. Recall the Setup through the Recall Setups submenu. 2. Change the instrument settings as desired. 3. Save the Setup as the same setup number through the Save Setups submenu.
Operating Basics 42 764 Digital Audio Monitor User Manual
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 application.
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.
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.
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. When Session is running, the instrument counts “invalid samples” and displays the total on the Session view.
Reference and 4fsń60 ȍ (L R ) (sign) + () 1) if n n is u 0 n +0 or 4fsń60 (sign) + (–1) if ȍ (L R ) n n is t 0 n +0 The actual correlation meter reading is the “rolling average” of the last i sample blocks: M+ C 1 ) C 2 ), . . . , ) C i i where i is determined by the Correlation Meter Speed setting in the Phase Display submenu. Table 1 lists i —and the corresponding averaging interval —for each meter speed selection.
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.
Reference Table 2: Level Meters submenu ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
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. When interpolation is OFF, the 764 level meters measure the digital input data only. When interpolation is ON, the instrument also measures interpolated data generated by a 4X oversampling filter.
Reference 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,” changing audio. A constant 1000 Hz, –10 dBFS tone, for example, will drive the meters to a constant –10 dBFS reading regardless of which Ballistics setting is selected.
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. The factory default is 10. CLIP/MUTE Hold Time (sec).
Reference 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. The four submenu items are identical, except for the affected channel.
Reference Figure 34: The De-emphasis flags The Phase Display Submenu Use the Phase Displaly submenu (Table 4) to configure the appearance and behavior of the Audio View Phase display.
Reference display orientation. Refer to page 26 for details on the phase display formats. Correlation Meter Speed. The Correlation Meter Speed setting 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. The 764 uses the fewest samples when this setting is 1, and the meter reacts almost instantaneously.
Reference Headphones Submenu Use the Headphonse submenu (Table 5) to determine the input channels to be decoded and output through the headphone jack.
Reference Table 7: Option 01 input submenu, audio inputs selected ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Item Choices Factory setting Audio Source Digital Audio Inputs Digital Video Input Digital Audio Inputs CH 1–2 input XLR-balanced BNC-unbalanced XLR-balanced CH 3–4 input XLR-balanced BNC-unbalanced XLR-balanced Reference input XLR-balanced
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.
Reference Peak Reading Interval (sec). Use this item to choose the duration of the 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). H Program peaks are not stored when the setting is 0 (zero).
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.
Reference 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. Refer to the 764 service manual for more information.
Reference Using the RS-232 Port The primary use of the 764 RS-232 port is to output session reports. The reports can be sent directly to any ASCII printer with serial input, or captured on a PC and saved to disk. The RS-232 port also supports remote control of 764 Digital Audio Monitors with serial number B020000 and higher.
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; choose the appropriate handshaking protocol through the Serial Port submenu. Set the serial communication parameters of the connected device to 8 bits, 1 stop bit, and no parity.
Reference Figure 36: Connecting to a DCE device with a DB25 serial port NOTE. Most Personal Computers are DTE devices; however, printers may be either DTE or DCE, and the type may not be obvious from the printer documentation or the gender of the RS-232 connector. If you have trouble outputting a 764 Session report, first verify that communication parameter and Baud rate settings are correct, then try reversing the conductors at pins 2 and 3 and 7and 8 at the cable end that is connected to the 764.
Reference 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. You can use the software and settings below to establish communications with a personal computer. H PC Software: Microsoft Windows 95 Hyperterminal Accessory application. Many other communications or terminal applications also work.
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. Run a session. 4. Stop the session, but do not reset it. 5. Press the on-screen Copy soft button (feature ➄ in Figure 23 on page 29). The 764 will send the report to the printer or PC.
Reference 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. For example: PRESS:SKEY5 can be abbreviated as p:skey5, but the complete argument is necessary. The unique letter or number is the last one of the argument.
Reference Table 16: General remote control commands (Cont.) Command Effect MSGON: Displays a temporary message up to 58 characters on the top line of the 764 display. Excess text does not wrap; it is truncated. MSGOFF Removes the temporary message. SYSTEM:ERROR Returns the last command error. SYSTEM:ERROR:CLEAR Clears the last command error. GET Commands. GET commands retrieve information from the 764; Table 17 lists and explains the GET commands.
Reference Table 17: Remote control GET commands (Cont.
Reference PRESS Commands. Each front-panel button (except the power switch) has an equivalent PRESS:
Reference 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.
Reference Table 19: Remote control MENU commands (Cont.
Reference Table 19: Remote control MENU commands (Cont.
Reference Table 19: Remote control MENU commands (Cont.
Appendix A: Specifications ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Appendix A: Specifications ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁ
Appendix A: Specifications ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ
Appendix A: Specifications Table 25: VGA output (Cont.) Characteristic Information Load Impedance Red Green Blue Horizontal Sync Vertical Sync 75 ohms 75 ohms 75 ohms TTL compatible TTL compatible Timing/Frequency Dot Clock Horizontal Rate Vertical Rate 25.175 MHz 31.469 kHz 59.
Appendix A: Specifications ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Table 26: Physical characteristics (Cont.) Characteristic Information Depth 17 inches (43.2 cm) Weight Net Shipping 10 lbs (4.54 kg) 17 lbs 5 oz (7.
Appendix A: Specifications Table 28: Environmental characteristics (Cont.
Appendix A: Specifications Table 29: Certifications and compliances (Cont.) Australia/New Zealand Declaration of Conformity – EMC Complies with EMC provision of Radiocommunications Act per the following standard(s): AN/NZS 2064.
Appendix A: Specifications 82 764 Digital Audio Monitor User Manual
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. Only possible when left and right channels are chosen from different inputs (for example, channel 1 paired with channel 4).
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,” set through the Level Meters submenu.
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; or inadequate or defective input signal(s). The INPUT UNLOCKED indicator persists for the “CLIP/MUTE Hold Time,” set through the Level Meters submenu.
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. A setting of zero (0) disables this indicator. The MUTE indicator persists for the “CLIP/MUTE Hold Time,” set through the Level Meters submenu.
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. The data sample is unreliable and is ignored. The meter bars and phase pattern treat the sample as a zero sample.
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” is set in the Level Meters submenu. V BIT Location: In-bar. Indicates that the Validity bit is set high for one or more data samples.
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. The option, available both factory-installed and as a field-upgrade kit, may be installed in any instrument with serial number B020000 and above.
Appendix C: Options Table 30: Option 01 characteristics (Cont.) Characteristic Description Equalization range Proper operation with up to 19.0 dB loss at 135 MHz using coaxial cable having 1/f1/2 loss characteristics with a launch amplitude of 800 mV Return loss (input and output) w15 dB relative to 75 ohms, 1–270 MHz, power on Output level 800 mVp-p"10% Operating Information The following paragraphs explain how to monitor embedded audio with a 764 Digital Audio Monitor equipped with Option 01.
Appendix C: Options 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. 6. Press the CLEAR MENU button to exit the menu hierarchy; then press VIEW:AUDIO, if necessary, to select the audio Phase or Session 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. You can also select appropriate meter response characteristics (ballistics) and alignment levels; refer to Level Meters, on page 43, for more information. Configure the Phase Display.
Appendix C: Options 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; it is available only as a factory option to the 764 and cannot be installed in existing instruments.
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 VRMS variable output only), you must connect one of the lines to ground; refer to Connecting the Instrument on page 97 for more information.
Appendix C: Options 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.
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. The AES–XLR cable must be connected to either J913 or J914; use J914 for fixed analog audio output and use J913 for variable output.
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. The analog line output polarity matches Figure 39 when the instrument is configured for variable high-level output.
Appendix C: Options Receiving equipment unbalanced input Analog line output XLR Pin 3 (–) Pin 1 (shield) Gnd Pin 2 (+) (+) OR Pin 2 (+) (+) Pin 3 (–) Gnd 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. The outputs will clip above approximately +20 dBu in unbalanced mode.
Appendix C: Options 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.
Appendix C: Options 100 764 Digital Audio Monitor User Manual
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. MUTE One or more consecutive “zero” samples.
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.
Index A accessories, standard, 1 AGC, 28 alignment level, 43 See also test level Audio view, 13 B ballistics (meter), 43, 50 PPM, 43, 50 True Peak, 44, 50 VU, 44, 51 C cable, serial communications, 62 CCIR 645, 43 Channel Status view, 15, 37 CLEAR MENU button, 18 using, 12 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 7
Index Get commands, 68 H headphones, 7 selecting channels, 48 Headphones submenu, 48, 56 I IEEE 152-1991, 44 Ignore Validity Bit, 52 Inputs digital audio, 3 configuring, 10 LTC, 5 reference, 5 RS-232, 6 SER.
Index channel pairing, 16 format, 26, 54 submenu, 54 PPM (meter ballistics), 43 Press commands, 70 Product Support, xii R 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 S Save Setups submenu, 40, 59 Screen Saver submenu, 60 Serial Port, submenu, 58 Serial video loop–through, 7 Service submenu, 61 Service Support, xii session Copy
Index U W User Data view, 15, 39 warning messages CODE ERR, 45, 84 Interpolation OFF, 50 LOW CONF, 45, 85 MUTE, 21 NO INPUT, 44, 85, 86 No Video Input, 92 NOT PRESENT, 93 PARITY, 45, 87 SYNC ERR, 32, 52 V BIT, 46, 88 V 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), 44 106 764 Digital Audio Monitor User Manual
