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http://www.sencore.com

                            

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1.800.736.2673 or 1.605.339.0100 

 

DA795

DigiPro

Digital Audio Analyzer

Operation Manual  

(Firmware version 1.17) 

3200 Sencore Drive, Sioux Falls, SD 57107 

Содержание DigiPro DA795

Страница 1: ...http www sencore com mailto sales sencore com 1 800 736 2673 or 1 605 339 0100 DA795 DigiPro Digital Audio Analyzer Operation Manual Firmware version 1 17 3200 Sencore Drive Sioux Falls SD 57107...

Страница 2: ...nual 2 Always be sure that your equipment is in good working order Broken or frayed test leads or cables can be extremely dangerous and may expose you to high voltages 3 Remove test leads immediately...

Страница 3: ...DA795 DigiPro Digital Audio Analyzer Form7494 Operation Manual iii DA795 DigiPro Digital Audio Analyzer Operation Manual Firmware version 1 17 3200 Sencore Drive Sioux Falls SD 57107...

Страница 4: ...Clock In Video Input 8 DB 9 Connector 8 LCD Contrast 8 Speaker 8 Battery Module Information 9 Battery Module Introduction 9 Charging 9 Automatic Power Switch 9 Battery Life Charging Times 9 Clocks Ro...

Страница 5: ...ock Test 30 Transparency Test 32 Latency Test 34 Jitter Meter 36 SYSTEM TOOLS MENU 38 Level Meter 39 LAeq Dialog Level 41 Signal Generator 42 Sweeps 44 Pass Mode 47 UTILITIES MENU 49 Digital Cable Tes...

Страница 6: ...s Word Clock in Digital outputs include AES EBU SP DIF and Toslink ADAT and Word Clock out Analog stereo headphone and unbalanced mono analog outputs provide for testing of dual domain devices such as...

Страница 7: ...us or asynchronous test Any modification of the digital data stream will be detected Latency Test Checks the amount of signal delay through a device with a digital device input and either a digital or...

Страница 8: ...96 kHz changing signal formats AES SPDIF ADAT adding digital gain or attenuating the signal Digital Cable Tester Tests digital audio cables for functional quality Provides a method of comparing digita...

Страница 9: ...ited Frequency Counter Frequency Accuracy 0 1 ppm or 0 01 Hz in a word clock or sample clock or 4 Hz in a master clock signal 256xFs Signal Generator Sine wave output frequency 1 Hz to 20 kHz Sine wav...

Страница 10: ...R digital output 110 ohms nominal S PDIF digital output 75 ohms nominal Word Clock digital output 75 ohms nominal Stereo Headphone analog output 5 ohms nominal RCA phono unbalanced analog output 110 o...

Страница 11: ...cable straight through connects between the unit s RS232 jack and a computer serial port supplied 17G46 Sealed Lead Acid Battery Module 6 volts supplied Battery not pictured 60G81 AC Power Adapter Cha...

Страница 12: ...nal is used only for timing jitter and lock measurements Power Adapter Input Jack The power input powers the DigiPro and charges the battery when the DigiPro is switched off Using an incorrect power a...

Страница 13: ...k The DigiPro digital output can be locked to this source if desired Also this connector can be selected by the Clock Sample Counter function to measure the frequency of the signal This connector also...

Страница 14: ...the DigiPro with the other charged battery module Automatic Power Switch The battery module uses an automatic relay to switch from AC to battery power and to prevent the SLA battery from being complet...

Страница 15: ...of the ADC derived features of the DA795 are available when the Master Clock is not locked These include the battery level AC indicator Digital Lock Test Video Lock Test Jitter Meter Level Meter and...

Страница 16: ...nterclockwise The moves the control focus highlight around the screen With the focus on a menu item or control field clicking the Control Knob does one of three things 1 Selects the choice as on a men...

Страница 17: ...tive battery level or remaining charge in the battery when operating on the internal battery When operating with the AC power adapter this field shows the AC power symbol x Function Name The name of t...

Страница 18: ...he bottom line on every function screen has control fields that are used to control the analog outputs and the digital generator The Latency Test doesn t need nor display all of the Toolbar controls A...

Страница 19: ...you remove headphones before switching any clocks or changing functions until a stable clock and lock has been established and the DigiPro has had a chance to regain control of the analog outputs Digi...

Страница 20: ...an ADAT sync connector Note that if you select a lock source with no input signal there will be no digital output In this case the Lock Source select field will blink Also since the ADC is driven by...

Страница 21: ...ins functions that are useful in analyzing digital audio signals The standard input source is Digital Input 1 The Analysis Functions menu includes the following functions Bitstream Analyzer Digital Wa...

Страница 22: ...screen and the Detail screen select the Digital Input 1 connector you wish to use and see a low resolution measurement of the sample rate of the selected digital input signal to 0 1 kHz Status Screen...

Страница 23: ...Signal Voltage On the third line to the right is a peak to peak volt meter with indicator marks at the recommended max and min voltage levels for either an AES or S PDIF digital signal Note that if y...

Страница 24: ...e just below the channel status information o Channel Status Bytes All 24 channel status bytes for both channels A and B are displayed starting on the fourth line on the screen These byte values are a...

Страница 25: ...nt and cabling x Monitor digital levels for conformity to level restrictions Digital Watchdog Display Controls o Level Threshold You can select a level that if exceeded triggers a Signal Over error Ov...

Страница 26: ...hat are on the verge of eye pattern problems Eye pattern errors may indicate a cable problem such as poor cable quality high capacitance will lower rise and fall times or excessive cable length which...

Страница 27: ...ols o Input Select Select the input signal you wish to count o Clock Frequency Displays the word clock or super clock frequency o Sample Rate Displays the sample rate of a digital audio signal or the...

Страница 28: ...d oscilloscope type display Changes in the amplitude of the audio signal are plotted along the vertical axis Changes in the audio signal over time are plotted along the horizontal axis To view the pha...

Страница 29: ...n to an oval pointing down Since an oval is symmetrical pointing up and pointing down looks the same Therefore you cannot distinguish between 90 degrees and 270 degrees but nonetheless the absolute ph...

Страница 30: ...the DA795 analog sine wave generator output is near 90 dB so any distortion measured above that level is coming from the ADC x Measure the distortion from a sample rate converter SRC Sample rate conve...

Страница 31: ...he DUT and select an internal crystal lock source at the desired sample rate on the Bottom Toolbar x Select the audio channel Select either the left or right audio channel for testing x Select the tes...

Страница 32: ...are used to test equipment and to isolate potential problems The input source for these tests is Digital Input 1 and or Digital Input 2 The Digital Tests menu includes the following tests Digital Loc...

Страница 33: ...l is locked to a word clock or super clock Digital Lock Test Display Controls Top Toolbar The Top Toolbar provides input select fields o Signal 1 Frequency The frequency of the signal at the Digital I...

Страница 34: ...94 Operation Manual 29 to the input optical connector or an ADAT sync signal to the DB 9 connector Select this input on the Top Toolbar x Read the results Read the absolute frequency drift on the nume...

Страница 35: ...minal Video Rate The ideal frequency ratio is determined and the actual frequency ratio of the two signals is then compared to the ideal ratio to determine the amount of drift using this formula Vf hr...

Страница 36: ...ts to their right 0 2 0 5 1 2 1 5 2 5 etc Video Lock Test Operation x Connect and select a video input signal Connect a video sync signal to the BNC input x Connect and select a digital audio input si...

Страница 37: ...ded using PCM recorders x Test DAT machines digital multi track recorders or CD recorders x Check whether a DAW will pass a transparency test at unity gain it should If ANY gain attenuation EQ compres...

Страница 38: ...t signal for as long as you wish the test to run x Read the results Once lock occurs you will ideally see a 0 in both left and right Errors columns Any non zero result indicates that the DUT is modify...

Страница 39: ...phasing errors in the recorded signal x Test the delay through a DAW or digital recording console Differences in delay through different paths in a console can contribute to phase errors Latency Test...

Страница 40: ...elect the input signal Connect the output of the DUT to one of the Digital Input 1 connectors AES EBU S PDIF Toslink or ADAT Select this input on the Top Toolbar x Run the test Click on the Run icon t...

Страница 41: ...onnected from the Word Clock Input to an internal converter clock test point to find the conversion jitter of ADCs or DACs Jitter Meter Display Controls o High Pass Filter Applies a high pass filter t...

Страница 42: ...og to digital converter ADC which is used to measure the output of the jitter board is clocked by the system master clock For this reason a valid master clock is required for this function to work If...

Страница 43: ...System Tools menu contains general purpose digital audio tools The standard input source is Digital Input 1 The System Tools menu includes the following functions Level Meter LAeq Dialog Level Signal...

Страница 44: ...y The absolute signal level to which the meter s 0 VU point is referenced may be adjusted from 0 to 24 dB FS The PPM Peak Program Meter indicator is shown as a single bar that bounces above the main b...

Страница 45: ...o the reference level set o PPM Meter The PPM Peak Program Meter indicator is a single bar that bounces above the main bar It uses the same reference level as the VU meter o Max Level The maximum peak...

Страница 46: ...mixes to the same perceived loudness level LAeq Dialog Level Applications x Determine the equivalent dialog level for Dolby Digital dialnorm or for any digital audio signal LAeq Dialog Level Display...

Страница 47: ...and view level indicators of the digital and analog signal outputs The Signal Generator can be entered either directly from the Tools menu or by clicking on the sine icon on the Bottom Toolbar of any...

Страница 48: ...ono and balanced TRS Analog Audio Output connectors Signal Generator Operation x Enter the Signal Generator function screen Click the Sine icon on the Bottom Toolbar of any DigiPro function without ex...

Страница 49: ...define the sweep parameters for the amplitude sweep function You can set the beginning and ending frequency and sweep time The level is set by clicking the Gen field to jump to the Signal Generator co...

Страница 50: ...e frequency can be selected in 1 3 octave steps The end frequency must be set higher than the start frequency for the sweep to run o Time Duration Sets the time duration for both the Sine and Amplitud...

Страница 51: ...ny of the DA795 digital or analog outputs to the device input 3 Select the start frequency 4 Select the end frequency 5 Select the sweep duration in seconds 6 Click on the Run icon to run 7 To change...

Страница 52: ...AES or S PDIF format or send the AES or S PDIF input to the ADAT output x Provide jitter correction for any format or sample rate input feeding to any format or sample rate output by locking to a stab...

Страница 53: ...ock Source This is true whether the signal or clock selected as the output lock source is the same or a different sample rate compared to the input signal x Output Lock Source To send the signal out w...

Страница 54: ...Manual 49 UTILITIES The Utilities menu contains two general purpose digital audio functions The Utilities menu includes the following functions Digital Cable Tester Capture Sample Data Save Defaults A...

Страница 55: ...or cable selection Digital Cable Tester Display Controls Digital Cable Tester Operation x Connect and select the input Connect one end of the cable to be tested to one of the Digital Input 2 connector...

Страница 56: ...ay Controls x Capture Buffer To begin capturing data immediately make sure that all five Capture Control fields Start Stop Count Goto Search are 0000 and click the Play icon Data will be captured from...

Страница 57: ...re Status field indicates Running until the specified value is detected After the data capture is done you can inspect the data go to a particular buffer address or search for a particular data value...

Страница 58: ...n all functions o Generator settings including lock source word length frequency and level Save Defaults Operation To store the current settings so that the DA795 starts up next time set this way set...

Страница 59: ...DA795 DigiPro Digital Audio Analyzer Form7494 Operation Manual 54 About Displays the firmware version loaded into the DA795 along with technical support contact information...

Страница 60: ...ital Audio Workstation A system designed to record edit and play back digital audio A key feature of DAWs is the ability to freely manipulate recorded sounds much like a word processor manipulates typ...

Страница 61: ...IEC 958 and AES 3 This unbalanced signal is commonly connected via coaxial BNC or RCA phono connectors This format is actually just another mode defined by AES EBU a direct descendant of the IEC 985 I...

Страница 62: ...ital audio devices so that all digital audio that may be fed between the devices is locked together Word Length Same as bit resolution Number of bits per digital sample CDs are 16 bits which allows fo...

Страница 63: ...ription of problem and reason for return No return authorization is required 2 Completely enclose the unit inside a plastic bag to protect its finish and prevent foreign material from getting inside 3...

Страница 64: ...Pro Digital Audio Analyzer Form7494 Operation Manual 59 3200 Sencore Drive Sioux Falls SD 57107 Call 1 800 SENCORE 736 2673 Innovatively designed www sencore com with your time in mind Form7494 Printe...

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