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Reference

764 Digital Audio Monitor User Manual

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

Choices

Factory setting

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

Format

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

LISSAJOUS-SOUND-
STAGE
LISSAJOUS-X–Y

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

LISSAJOUS-SOUND-
STAGE

ÁÁÁÁÁÁÁ

Correlation Meter Speed

ÁÁÁÁÁÁÁ

1 to 20

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

Pair A Left channel as-
signment

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

1; 2; 3; 4

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

Pair A Right channel
assignment

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

1; 2; 3; 4

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

Pair B Left channel as-
signment

ÁÁÁÁÁÁÁ

1; 2; 3; 4

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

Pair B Right channel
assignment

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

1; 2; 3; 4

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁ Á

ÁÁÁÁÁÁÁ

Format.

To change the phase display format, scroll to this menu

choice and then press the soft button that corresponds to the desired

Содержание 070-8811-08

Страница 1: ...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 ...

Страница 2: ... 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 ...

Страница 3: ...shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warran ty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the prod uct b to repair damage resulting from improper use or connection to incompatib...

Страница 4: ...4 VGA Video Output 5 5 RS 232 Communications Port 6 6 Optional Serial Video Loop Through 7 Headphones 7 Supplying Power 8 Initial Power Up and Configuration 9 Operating Basics 13 Overview 13 Monitoring an Audio Program with the Audio View 13 Session Reports 14 Monitoring the Ancillary Data 15 Other Features 16 Front panel Controls 16 The Level Meters 18 Configuring the Level Meters 22 Sum and Diff...

Страница 5: ...tion Meter Algorithm 46 Selecting Headphone Channels 48 Submenus 48 The Level Meters Submenu 48 The De emphasis Submenu 53 The Phase Display Submenu 54 Headphones Submenu 56 Input Submenu 56 Time Code Submenu 57 Serial Port Submenu 58 Save Setups Submenu 59 Restore Setups Submenu 60 Screen Saver Submenu 60 Service Submenu 61 Using the RS 232 Port 62 Cable Requirements 62 Communication Examples 64 ...

Страница 6: ...our system 4 Figure 5 Using an external color monitor 6 Figure 6 Outputting a session report 7 Figure 7 The headphone output schematic 8 Figure 8 Controls for initial power up and configuration 9 Figure 9 The top menu HELP message 10 Figure 10 Selecting from the top menu 11 Figure 11 The inputs submenu 12 Figure 12 The 764 AUDIO SESSION view 14 Figure 13 The 764 AUDIO PHASE view 15 Figure 14 764 f...

Страница 7: ...2 An in bar warning message 45 Figure 33 The interpolation OFF message 50 Figure 34 The De emphasis flags 54 Figure 35 Connecting to a DTE device with a DB25 serial port 63 Figure 36 Connecting to a DCE device with a DB25 serial port 64 Figure 37 The Audio view with digital video input selected 91 Figure 38 Option 02 connectors 93 Figure 39 Standard balanced output pin assignments 97 Figure 40 Con...

Страница 8: ...nds 68 Table 18 Remote control PRESS commands 70 Table 19 Remote control MENU commands 71 Table 20 Digital audio inputs 75 Table 21 Level Meters and Phase Display 76 Table 22 SMPTE Time Code inputs 76 Table 23 Interface parameter measurements 76 Table 24 Headphone output 77 Table 25 VGA output 77 Table 26 Physical characteristics 78 Table 27 Power requirements 79 Table 28 Environmental characteris...

Страница 9: ...Table of Contents vi 764 Digital Audio Monitor User Manual ...

Страница 10: ...to operate from a power source that will apply no more than 250 VRMS between the supply conductors or between either supply conductor and ground Ground the Product Before connecting the product s input or output terminals plug the power cord into a properly wired receptacle A protective ground connection through the grounding conductor in the power cord is essential for safe operation Use Proper F...

Страница 11: ...fety Terms and Symbols Terms in this Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard...

Страница 12: ... Summary 764 Digital Audio Monitor User Manual ix Symbols on the Product The following symbols may appear on the product DANGER High Voltage Protective Ground Earth Terminal ATTENTION Refer to Manual Double Insulated ...

Страница 13: ...General Safety Summary x 764 Digital Audio Monitor User Manual ...

Страница 14: ...a about the audio program material as well as Channel Status and User Data information encoded in the digital audio signal Figure 1 The Tektronix 764 Digital Audio Monitor Through on screen menus and front panel controls the user may configure the response dynamics ballistics reference levels offset and scale of the meters to suit the monitoring needs of the particular installation or situation Th...

Страница 15: ...ess Tektronix Inc Department or name if known 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA Web site www tektronix com Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support Email techsupport tektronix com 1 800 833 9200 select option 3 1 503 627 2400 6 00 a m 5 00 p m Pacific time This phone number is toll free in North America...

Страница 16: ... A power cord Any cabinet ordered with the instrument is shipped in a separate carton Mechanical Installation To accommodate the installation needs of users worldwide Tektronix provides the 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 appl...

Страница 17: ... 2 Without the mounting screws an instrument can slip out of its cabinet if tipped forward 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 The connections you make will depend on your particular installation and operating envi...

Страница 18: ...led 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 Set the TERM switches immediately below these connectors to EXT when the 764 is installed in line select 110 Ω internal termination when the instrument is at...

Страница 19: ...ts set to 110 Ω Refer to Appendix C Options for more information about Option 02 H 75 Ω BNC connectors that accept unbalanced digital audio signals in both professional AES EBU and consumer IEC958 formats 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 t...

Страница 20: ...Session Report The format of the time display is Hours Minutes Seconds Frames 3 Reference Inputs Connect your house digital audio reference DAR signal to one of the REF IN connectors These connectors one BNC one XLR accept the same formats as the Digital Audio Inputs They are internally terminated As with the audio inputs the default connector is XLR use the on screen menus to select the BNC conne...

Страница 21: ...nning a communications application such as PROCOMM or the Terminal accessory of Microsoft Windows Refer to Session Reports beginning on page 34 H Operate the instrument serial number B020000 and later by remote control 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 represen...

Страница 22: ...onnectors 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 Headphones The front panel headphone output lets you listen to the audio programs contained in the digital input signals The connector accepts a standard 1ń4 inch 6 35 mm stereo ...

Страница 23: ...nnels independent of the phase display choices for instructions refer to Selecting Headphone Channels on page 48 Supplying Power You can operate the 764 on any AC power supply that provides 90 to 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...

Страница 24: ... 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 If the input is through a BNC connector you must reconfigure the input with the following procedure before you can monitor the signal In either case please take this opportunity to familiarize yourself with the 764 front panel controls Figure 8...

Страница 25: ...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 The knob icon appears in the upper right corner of the display when the multi function knob is active Here you may turn the knob to scroll among the TOP MENU choices Turn the knob now to scroll the ...

Страница 26: ...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 To change the channel 1 2 input to the BNC connector press the soft button to the right of the BNC unbalanced choice The change is in effect when you exit the menu and return to normal operation 1 Because there are no other soft button assign...

Страница 27: ...ighlight 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 ...

Страница 28: ...iled information about the more technical aspects of 764 operation in the Reference section of this manual Overview The 764 permits in line monitoring of the audio program contained in a digital audio signal without first converting it to analog form In addition it can report and interpret the ancillary data that is transmitted through the Channel Status and User Data bits of the digital data stre...

Страница 29: ...The 764 has many options that affect the appearance and behavior of the Audio view features For more information refer to The Level Meters beginning on page 18 Sum and Difference Bars on page 25 The Phase Display on page 26 and The Session Display on page 29 Session Reports The 764 can also output session reports which are permanent records of session activity through the rear panel RS 232 port Th...

Страница 30: ...o additional 764 view options Channel Status View The Channel Status view reports the information embedded in the channel status bytes of the incoming serial digital signal Select the Channel Status view by pressing CLEAR MENU if necessary to exit the on screen menus then the VIEW CH STATUS button You may select a number of Channel Status view options with the Soft buttons to the right of the disp...

Страница 31: ...settings are preserved with internal bat tery back up 2 VIEW Selection buttons Use the VIEW buttons to select among the AUDIO CH annel STATUS and USER DATA views These buttons are inactive when a menu is present on the 764 display The OTHER button is not used in this version of the instrument 3 PHASE DISPLAY and SESSION buttons Use the PHASE DISPLAY buttons to configure the right portion of the Au...

Страница 32: ...CALE 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 OFF SET with the multi function knob to configure the range and offset of the custom scale Refer to The Level Meters beginning on page 18 for more information 5 Multi function knob Turn the multi function knob to expand and offset the...

Страница 33: ...lso controls the gain of the rear panel analog audio out puts 10 Display BRIGHTNESS control Turn the BRIGHTNESS knob to ad just the brightness of the 764 display Does not affect the output of the rear panel VGA VIDEO connector The Level Meters The 764 level meters are vertical bar graphs in which the height of each bar indicates the amplitude of the audio program contained on the corresponding inp...

Страница 34: ...cale extended to permit display of true peaks on the same bar PPM a quasi peak meter with 10 ms in tegration time and slow decay and True Peak with instantaneous response and slow decay 2 Scale Units dBFS or dBr By default the zero dB mark is at digital full scale and units are in dB relative to full scale dBFS You may also set the 0 dB mark to either the Peak Program level or the Test level see i...

Страница 35: ... Reference level or Line up level The diamond shaped Test level marker will be yellow on an external color display and the part of the meter bar between this level and Peak Program level will also be yellow The default test level is 18 dBFS it may be set to any integer between 0 and 30 dBFS 5 Variable scale The scale range and offset may be adjusted through the METER SCALE EXPAND and OFFSET button...

Страница 36: ...The default is 10 samples the range is 0 to 100 The Mute indicator always reacts to unpro cessed input data regardless of Interpolation or de emphasis settings refer to Interpolation on page 50 or The De emphasis Submenu on page 53 You may also specify the persistence hold time for the in bar indicators between 1 and 30 seconds the default is 2 seconds 7 Meter bar labels The meter bar labels depen...

Страница 37: ... 1 to 100 samples Like the Mute indicator the clipping flag always reacts to unprocessed input data regardless of Interpolation or de em phasis settings Configuring the Level Meters You can configure the level meter scale with front panel controls Other meter characteristics such as ballistics scale units and program test levels are configured through the on screen Level Meter submenu Variable sca...

Страница 38: ...on 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 Press CLEAR MENU if necessary to exit any menu and resume normal operation 2 Press MENU to enter the root menu the TOP MENU 3 Turn the multi function knob to scroll the menu highlight to the Level meters ...

Страница 39: ...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 Press the soft button that corresponds to the desired setting or that increments or decrements the numeric value A numeric value will continue to in...

Страница 40: ...ow the levels of one input pair 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 is one half of the difference between the channels That is Sum L R 2 Diff L R 2 The Sum and Difference bars ...

Страница 41: ...ip 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 You can set the instrument for either Soundstage or X Y orientation of the Lissajous pattern as illustrated in Figure 21 NOTE The orientation of the Lissajous pattern phase channel pairings and Correlation meter speed see below are selecte...

Страница 42: ...ta are plotted along diagonal axes and mono or in phase audio appears along the vertical 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 The Correlation Meter The Correlation meter ...

Страница 43: ...he 764 the pointer will usually read between 0 5 and 1 and will move as the correlation between the two channels changes Choose the time constant of the meter and thus the speed of meter response through the Phase Display submenu AGC AGC automatic gain control keeps the Lissajous pattern visible and within the bounds of the phase display for signal levels between 0 dBFS and approximately 40 dBFS W...

Страница 44: ...ssion 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 Session time is the time elapsed since the session was started or since the most recent session reset You can set the 764 through the Time Code sub...

Страница 45: ...R MENU to reset all Session statistics to 0 or blank unknown Note that a Session reset erases all Session statistics from memory if you plan to output a Session report do so before you reset the Ses sion 5 Copy soft button is present when SHORT REPORT or LONG REPORT has been selected through the Serial Port submenu and the session has been stopped but not reset Press the soft button to output a se...

Страница 46: ...h H Code Violations the number of raw serial data subframes containing biphase coding errors that are encountered during the session Code Violations indicate an incorrect or unreliable serial digital signal or transmission path H The digital audio word length detected by monitoring bit activity in the part of the digital signal reserved for audio sample data Although it is not likely this number c...

Страница 47: ...th 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 Notice the No Reference Signal message in Figure 25 It will appear whenever a DAR is absent from the REFERENCE input Figure 25 Sync Error Reporting in the Absence of a DAR The AES11 standard specifies that synchron...

Страница 48: ...r when the input signal sample frequency varies from the reference frequency by 0 01 kHz or more Any such frequency mismatch will cause the input signal to slide relative to the reference with constantly changing sync error the 764 detects this and displays the appropriate SYNC ERR flag s at all times not just when the error exceeds 25 Both the No Reference Signal message and the SYNC ERR flags ma...

Страница 49: ...e 00 00 41 Settings Display Mode 4 Channels Interpolation ON Ballistics TRUE PEAK Peak Program Level dBFS 8 Test Level dBFS 18 Consecutive full scale samples for clip 1 Consecutive zero samples for mute 10 De emphasis used on channel 1 NONE De emphasis used on channel 2 NONE De emphasis used on channel 3 NONE De emphasis used on channel 4 NONE Channel 1 Channel 2 Channel 3 Channel 4 Highest True P...

Страница 50: ...dBFS Session dBFS 00 00 10 13 6 00 00 10 12 1 00 00 12 12 1 00 00 12 12 1 00 00 31 4 9 00 00 31 0 00 00 30 0 00 00 30 0 Clips Found NONE Mutes Found Channel 1 Channel 2 Channel 3 Channel 4 Session Session Session Session 00 00 32 00 00 32 00 00 37 00 00 37 Invalid Samples Found NONE Parity Errors Found NONE Code Violations Found Channel 1 Channel 2 Channel 3 Channel 4 Session Session Session Sessi...

Страница 51: ...se the following procedure to output a session report 1 Connect the 764 to the printer or PC Cable requirements are explained under Using the RS 232 Port beginning on page 62 2 Select the appropriate communications and report options flow control baud rate type of report and peak reading interval through the Serial Port submenu for more information refer to Serial Port Submenu beginning on page 58...

Страница 52: ...ecoded text the default illustrated in Figure 28 binary Figure 29 transmission order binary or hexidecimal To change display formats press the soft button assigned to the desired format as listed on the right side of the Channel Status View H In Text mode the Channel Status data is spelled out in plain English as shown in Figure 28 The 764 will decode embedded channel status data per AES3 1992 or ...

Страница 53: ...m of the screen Only one channel at a time is shown in binary mode the selected channel is indicated on the top line of the display Press the CHAN soft button repeatedly to cycle among the four input channels H The Xmsn Order Binary display reverses the bit order to correspond to transmission order LSB first of the Channel Status bits Use the knob as in the binary display to highlight bits or bit ...

Страница 54: ... user data Press CLEAR MENU if necessary to exit a menu then the VIEW USER DATA button to select the User Data view User data may be displayed either in Hexidecimal form or as the equivalent ASCII text The Text mode is shown in Figure 30 Select the desired format by pressing the appropriate soft key The Hexidecimal display format has room for data from all four input channels the Text display show...

Страница 55: ...ure the instrument as desired with the front panel controls and through the various submenus 2 Enter the top menu Press CLEAR MENU then MENU to enter the top menu anytime the 764 is operating 3 Use the multi function knob to scroll the menu highlight to Save Setups Press any soft button to enter the submenu 4 Press one of the three available soft buttons to save the instrument settings A highlight...

Страница 56: ...ess 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 ...

Страница 57: ...Operating Basics 42 764 Digital Audio Monitor User Manual ...

Страница 58: ...l program exchange In either case the next few paragraphs may help you decide on the Ballistics Peak Program Level Test Level and 0 dB Mark settings for your 764 To ease signal exchange between equipment EBU Recommendation R68 1992 suggests that the alignment level be set at 18 dB below maximum digital coding level that is 18 dBFS This level corresponds to the CCIR 645 renamed ITU R BS 645 2 analo...

Страница 59: ...ave their own internal standards Some experienced recording engineers prefer a higher alignment level than 18dBFS to make fuller use of the available coding range for a better S N ratio Others are more conservative For example SMPTE in RP 155 90 recommends a reference level of 20 dBFS And of course digital purists may always select True Peak ballistics In Bar Warning Messages The in bar warning me...

Страница 60: ...ssage PARITY 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 When Session is running the instrument counts parity errors and displays the total on the Session view LOW CONF Low Confidence This warning message indicates a marginal sig...

Страница 61: ...reat all samples as valid and the word off will appear in the Invalid samples fields of the Session view This feature is included because the use of the Validity bit varies despite its official meaning as specified in the AES EBU standard and you may find it desirable to monitor audio from invalid samples Correlation Meter Algorithm The correlation meter reading is calculated 60 times each second ...

Страница 62: ...Á ÁÁÁ 1 ÁÁÁÁ ÁÁÁÁ 0 0167 ÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁ 11 ÁÁ ÁÁ 180 ÁÁÁÁÁ ÁÁÁÁÁ 3 0 ÁÁÁÁ ÁÁÁÁ 2 ÁÁÁ ÁÁÁ 2 ÁÁÁÁ ÁÁÁÁ 0 0333 ÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁ 12 ÁÁ ÁÁ 210 ÁÁÁÁÁ ÁÁÁÁÁ 3 5 ÁÁÁÁ ÁÁÁÁ 3 ÁÁÁ ÁÁÁ 4 ÁÁÁÁ ÁÁÁÁ 0 0667 ÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁ 13 ÁÁ ÁÁ 240 ÁÁÁÁÁ ÁÁÁÁÁ 4 0 ÁÁÁÁ ÁÁÁÁ 4 ÁÁÁ ÁÁÁ 8 ÁÁÁÁ ÁÁÁÁ 0 1333 ÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁ 14 ÁÁ ÁÁ 270 ÁÁÁÁÁ ÁÁÁÁÁ 4 5 ÁÁÁÁ ÁÁÁÁ 5 ÁÁÁ ÁÁÁ 16 ÁÁÁÁ ÁÁÁÁ 0 2667 ÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁ 15 ÁÁ ÁÁ 300...

Страница 63: ...hannels you wish independent of the phase display selections Follow these steps to make manual headphone selections 1 Enter the top menu either by pressing MENU or the TOP MENU soft button if already in a submenu 2 With the multi function knob move the menu item highlight to Headphones Then press a soft button to enter the submenu 3 Set the Audio Source to MANUAL 4 Select the appropriate Manual Le...

Страница 65: ...o see a more accurate representation of the levels in the reconstructed analog audio program A display message immediately below the level meters reminds you when Interpolation is set to OFF see Figure 33 Figure 33 The interpolation OFF message Ballistics Use the Ballistics item to configure the dynamic response of the level meters to conform to one of three standards H PPM peak program meter whic...

Страница 66: ... Level dBFS Test level is the level relative to digital full scale that you choose as the test or line up level for your system The meter bars change to medium brightness on the 764 display or yellow on an external VGA monitor between the Test and Peak Program levels Set 0 dB Mark to Use this item to number the meter scale relative to Digital Full scale or to one of the two user adjustable levels ...

Страница 67: ...ning on page 44 Ignore Validity Bit Ignore Validity Bit determines how the instrument will react to a high value 1 validity bit in the input data In AES3 1992 digital audio a high validity bit indicates that the sample word is not suitable for conversion to audio When this item is set to the factory default of No the 764 will ignore any sample accompanied by a high validity bit display a V BIT fla...

Страница 68: ...UTO is selected the 764 will apply the appropriate de emphasis if either CCITT J 17 or 50 15 emphasis is indicated in the channel status data of the digital input signal If you choose de emphasis please be aware that although the 764 will continue to use raw input data when reporting MUTEs and CLIPs the level meters and session statistics will measure and report levels in the de emphasized signal ...

Страница 70: ...efault channels 1 and 2 are phase pair A and channels 3 and 4 are pair B You can however designate channels 1 and 3 or 1 and 4 or channels 2 and 3 or 2 and 4 as either pair A or pair B Change the channels of the phase pairs using the following steps 1 Press the MENU button 2 Turn the multifunction knob until PHASE DISPLAY is highlighted 3 Push any of the inner group white soft key buttons to the r...

Страница 73: ...ontrol Scroll to the Flow Control menu choice by turning the multi function know and then press the soft button that corresponds to the appropriate type of flow control If you do not know which flow control is correct for your application first try HARDWARE when outputting a report to a printer and SOFTWARE when downloading a report to a personal computer Baud Rate Scroll to the Baud Rate menu cho...

Страница 74: ...tics depends on this setting and the number of error events that occur Assuming few clips mutes or other errors the 764 has enough memory for at least 30 minutes of records when the interval is set to 1 second and over 30 hours when the factory setting 60 seconds is used Choose an interval that is appropriate to your situation be aware that the 764 can store enough peak data to fill over 70 pages ...

Страница 75: ...Selection ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ SETUP 1 SETUP 2 SETUP 3 FACTORY SETUP ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ not applicable Screen Saver Submenu Select a suitable delay in the Screen Saver submenu Table 13 to help prevent display burn in Choose an interval long enough to prevent activation during program monitoring When the screen saver is active press any button to restore the normal display T...

Страница 76: ...ÁÁÁÁÁ MONITOR CROSS HATCH ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ not applicable ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ Information ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ SOFTWARE VERSION IDENTIFICATION NUM ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ not applicable ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ Numeric Level Readout ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ OFF ON ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ OFF Adjustment Once you choose this item you can cycle through the four available test patterns by repeatedly press...

Страница 77: ...mmands section which begins on page 66 Cable Requirements The 764 is an RS 232 DCE device Table 15 lists the pin assignments of the connector 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 lin...

Страница 78: ...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 Be sure that the same Baud rate is selected at the 764 and the connected device Figure 35 Connecting to a DTE devic...

Страница 79: ...and 3 and 7and 8 at the cable end that is connected to the 764 Communication Examples The following hardware software and 764 settings have been verified effective for either printing a session report to a printer or download ing the report to a 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 constitu...

Страница 80: ...any other communications or terminal applications also work H Hyperterminal application File menu Properties command Connect To tab settings Connect Using COMX depends on computer configuration often COM2 when a serial mouse is installed Configure Baud Rate 19200 or 38400 Bits 8 Stop Bits 1 Parity none Flow Control Xon Xoff H 764 Serial Port settings Flow Control SOFTWARE Baud Rate 19200 or 38400 ...

Страница 81: ... Commands Once you have established communications between the 764 and a personal computer or ASCII terminal you may use the remote control commands to operate the audio monitor from the computer or terminal Command Syntax Use the colon as the command argument separator as in the following examples PRESS SKEY4 the command to press soft key number 4 MENU DISMODE 1 the command to display the sum and...

Страница 82: ...age is displayed showing the incorrect command If you are in doubt about an abbreviation use the entire argument General Commands Table 16 lists and explains the general or miscellaneous 764 remote control commands Table 16 General remote control commands Command Effect HELP Displays the list of remote commands KNOB UP 1 10 Scrolls up a menu or data list by the specified number of positions or tur...

Страница 83: ... and explains the GET commands SYNTAX GET mnemonic number no number or invalid number returns all selections for the mnemonic Table 17 Remote control GET commands Command Value selection Retrieves GET none Lists all the GET commands GET mnemonic none All the values for the command mnemonic GET TIME none Current Session LTC or VITC time GET FRAME 0 1 0 Ch 1 2 input 1 Ch 3 4 input Frame Sync Errors ...

Страница 84: ...er bar 1 1 Meter bar 2 2 Meter bar 3 3 Meter bar 4 Session true peak GET RAWTP 0 3 0 Meter bar 1 1 Meter bar 2 2 Meter bar 3 3 Meter bar 4 Raw true peak GET CURHP 0 3 0 Meter bar 1 1 Meter bar 2 2 Meter bar 3 3 Meter bar 4 Current high peak GET SHIGH 0 3 0 Meter bar 1 1 Meter bar 2 2 Meter bar 3 3 Meter bar 4 Session high peak GET RAWHP 0 3 0 Meter bar 1 1 Meter bar 2 2 Meter bar 3 3 Meter bar 4 R...

Страница 85: ...ESS commands PRESS APH PHASE DISPLAY A PRESS AUDIO VIEW AUDIO PRESS BPH PHASE DISPLAY B PRESS CHSTAT VIEW CH STATUS PRESS CLEAR CLEAR MENU PRESS CUSTOM METER SCALE CUSTOM PRESS EXPAND METER SCALE EXPAND PRESS NORMAL METER SCALE NORMAL PRESS MENU MENU PRESS OFFSET METER SCALE OFFSET PRESS OTHER VIEW OTHER PRESS SESSION PHASE DISPLAY SESSION PRESS SKEY1 Soft Button 1 top PRESS SKEY2 Soft Button 2 PR...

Страница 91: ... SMPTE Time Code inputs ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ Characteristic ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Information ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ VITC Vertical Interval Time Code ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Reads NTSC and PAL VITC conforming to IEC publication 461 indicates time as Hours Minutes Seconds ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ Input connector ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ BNC 75Ω termination no loop through ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ...

Страница 92: ...ÁÁÁÁ ÁÁÁÁÁÁÁÁÁ Frame Sync Err session view ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Table 24 Headphone output ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ Characteristic ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ Performance require ments ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ Supplemental information ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ Output voltage ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ u10 Vp p ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ into 150 Ω load 0 dBFS input ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ Freque...

Страница 94: ...ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ NOTE Safety certification compliance to 40 C 0 C to 50 C 32 to 122 F 55 C to 75 C 67 to 167 F ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ Humidity ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Will operate at 93 relative humidity for up to five days Meets requirements of the five day humidity cycling test described in Tektronix standard 062 2847 00 ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ...

Страница 95: ...y ÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁ Emissions ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 47 CFR Part 15 Subpart B Class A Table 29 Certifications and compliances EC Declaration of Conformity EMC Meets intent of Directive 89 336 EEC for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the Official Journal of the European Communities EN 50081 1 Emissions EN 55022Class B Ra...

Страница 96: ...for electrical equipment for measurement control and laboratory use Approvals UL3111 1 Standard for electrical measuring and test equipment CAN CSA C22 2 No 1010 1 Safety requirements for electrical equipment for measurement control and laboratory use Installation Category Descriptions Terminals on this product may have different installation category designations The installation categories are C...

Страница 97: ...Appendix A Specifications 82 764 Digital Audio Monitor User Manual ...

Страница 98: ...ired with channel 4 CLIP Location Audio View above the meter bar of the affected channel The CLIP indicator flashes when the digital audio data on the input channel remains at full scale for n or more consecutive samples The factory default value of n is one 1 it may be changed through the Level Meters submenu Full scale means maximum coding level either positive or negative Maximum coding level i...

Страница 99: ...ay CRC Error Location Channel Status View lower left corner The Cyclic Redundancy Code calculated by the 764 does not agree with that calculated by the originating equipment and transmitted in Channel Status byte 23 of the digital input signal This discrepancy usually results from errors in digital signal transmission De emp Location Audio View above meter bar of affected channel De emphasis is in...

Страница 100: ...bmenu Interpolation OFF Location Audio View below meter bars may be obscured by other error messages Interpolation has been turned OFF through the Level Meters submenu This message will persist until Interpolation is returned to the factory default setting of ON LOW CONF Location In bar Low Confidence This warning message Indicates a marginal signal on the serial digital interface Problems that ca...

Страница 101: ...w below the Session or Phase display The 764 is not locked to an incoming signal on the REFERENCE input Likely causes of this message include missing reference signal incorrect Reference Input setting in the Inputs submenu or an inadequate or defective DAR signal The flag will persist until a valid reference signal is detected or until Suppress Sync Loss Flags is selected through the Level Meters ...

Страница 102: ... the Level Meters submenu When a Session is running the instrument counts parity errors and displays the current total on the Session display SYNC ERR Location Audio View below the affected meter pair 1 2 or 3 4 Either the input is out of synchronization with the REFERENCE input signal by at least 25 of the digital audio sample frame or the input to reference timing is constantly changing due to m...

Страница 103: ...d 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 current total on the Session display You can suppress the V BIT message by setting the Ignore Validity Bit item in the Level Meters submenu to YE...

Страница 104: ...nstrument with serial number B020000 and above It consists of an active digital video loop through and the circuitry required to extract digital audio from 625 and 525 line Component and NTSC Composite serial digital video Option 01 instruments retain all features of the standard 764 Digital Audio Monitor Table 30 lists and describes important Option 01 characteristics Table 30 Option 01 character...

Страница 105: ...ect the Instrument Connect the 764 to the digital video signal path with appropriate 75 W coaxial cable such as Belden 8281 Notice that the SER VIDEO IN and SER VIDEO OUT connectors make up an active loop through in which the output is an equalized and regenerated copy of the input A termination is not required on the serial video output when the instrument is installed at the end of the signal pa...

Страница 106: ... audio Phase or Session display Notice that sixteen diamonds arranged in four groups of four now occupy the top of the display as shown in Figure 37 The diamonds represent the four groups of four audio channels defined in SMPTE 272M Bright diamonds indicate active channels a white underline indicates the channel group that you have selected through the Input submenu The numbers of the selected cha...

Страница 107: ...annel 6 right and phase pair B is channel 7 left and channel 8 right You can specify any pairing of the four channels through the Phase Display submenu Refer to The Phase Display Submenu beginning on page 54 for information about specifying phase pairings setting the phase display orientation and setting the correlation meter speed Changes to the Session Statistics Display Because Parity errors co...

Страница 108: ...g instruments Option 02 has the following features and characteristics H The option provides two channels typically left and right of balanced analog output H The audio channels present on the left and right analog line outputs are those selected by the user for headphone monitoring Figure 38 Option 02 connectors H The analog output can be configured one of three ways fixed at 24 dBm into a balanc...

Страница 109: ... 02 instruments set to 110 W for proper XLR input termination Table 31 lists and describes important Option 02 characteristics Table 31 Option 02 characteristics Characteristic Description Output Level With 0 dBFS 1 kHz sine wave applied to the input Fixed gain 24 dBm 1 6 0 0 dBm into 600 W balanced Variable gain high output 24 dBm volume control fully clockwise into 600 W balanced Variable gain l...

Страница 110: ...ectors at the rear of the chassis The configuration jumper pins are readily accessible on the top surface of the board 2 Identify the jumper configuration in Table 32 that corresponds to the desired output add and remove jumpers to from the jumper pin pairs to achieve that configuration Pin pairs J20 J21 J22 and J23 are provided as a convenient place to park unused jumpers If you need additional j...

Страница 111: ...ne on J913 or J914 Pin one is indicated by a triangular symbol on the circuit board and a triangular symbol and white dot on the cable connector 4 Reinstall the 764 in its enclosure and reconnect it to your system The appropriate analog audio cable connections depend on the analog output configuration Refer to Connecting the Instrument on page 97 for analog audio cable requirements 5 The audio inp...

Страница 112: ...for variable high level output If you are using fixed output and output phase must match input phase reverse the connections to pins 2 and 3 Pin 3 Pin 2 Pin 1 shield Male XLR Figure 39 Standard balanced output pin assignments Low level Unbalanced Output When using low level output to drive an unbalanced load such as a consumer amplifier you must use cables that short either pin 2 or pin 3 to pin 1...

Страница 113: ...in 1 shield Gnd OR 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 Do not use unbalanced mode when you have configured the instrument for either fixed high level output or variable high level output ...

Страница 114: ...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 Normal usage Option number North America 125V 15A Plug NEMA 5 15P Standard Europe 230 V A1 United Kingdom 230 V A2 Australia 230 V A3 North America 230 V A4 Switzerland 230 V A5 ...

Страница 115: ...Appendix C Options 100 764 Digital Audio Monitor User Manual ...

Страница 116: ...gital audio frame MUTE One or more consecutive zero samples The actual number of consecutive samples that constitute a MUTE may be adjusted through the Level Meters submenu the factory setting is ten 10 nil The measured signal level is lower than 90 dBFS Session A mode of instrument operation during which the digital audio input signals are monitored and signal data are collected Session Time The ...

Страница 117: ...nitor User Manual 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 ...

Страница 118: ...tion 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 OFFSET 17 multi function knob 17 PHASE DISPLAY buttons 16 SESSION button 16 TERM switches 3 VIEW buttons 16 VOLUME knob 7 18 Copy soft button 30 correlation meter 27 speed 55 D De emphasis submenu 53 defaults restoring 40 digital audio inputs 3 configuri...

Страница 119: ...ubmenu 48 level meters 18 0 dB mark 51 ballistics 19 50 CLIP flag 22 display mode 49 interpolation oversampling 50 peak hold time 51 scale 19 20 22 true peak indicator 21 Lissajous pattern 27 M MENU button 10 18 Menu commands 70 Menu HELP messages 10 Menus general techniques 10 METER SCALE buttons 17 MUTE indicator 21 MUTEs message persistence 52 samples required 51 N No Reference Signal message i...

Страница 120: ...ervice Support xii session Copy soft button 30 display 29 maximum duration 59 reports 34 RESET soft button 30 statistics 30 time 29 SESSION button 16 session display running stopped indicator 30 session time 29 Setups saving and restoring 40 SMPTE RP 155 90 44 soft buttons 11 Specifications 75 Standby mode 8 submenus De emphasis 53 Headphones 48 56 Inputs 56 Level Meters 48 phase display 54 Restor...

Страница 121: ...e 52 VGA video output 5 VIEW buttons 16 Views Audio 13 Channel Status 15 User Data 15 VOLUME knob 18 VU meter ballistics 44 W 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 ...

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