Sencore DigiPro DA795 User manual

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DA795
DigiPro
Digital Audio Analyzer
Operation Manual
(Firmware version 1.17)
3200 Sencore Drive, Sioux Falls, SD 57107

DA795 DigiPro Digital Audio Analyzer Form7494 Operation Manual
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WARNING
PLEASE OBSERVE THESE SAFETY PRECAUTIONS
There is always a danger present when using electronic test equipment.
Unexpected voltages can be present at unusual locations in defective
equipment and distribution systems. Become familiar with the equipment
with which you are working, and observe the following safety precautions.
Every precaution has been taken in the design of the DigiPro DA795 Digital
Audio Analyzer to insure that it is as safe as possible. However, safe operation
depends on you, the operator.
1. Never exceed the limits of the DigiPro DA795 as given in the specifications
section or other special warnings provided in this manual.
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 following measurements to reduce the
possibility of shock.
4. Do not work alone when working under hazardous conditions. Always have
another person available in case of an accident.
5. Never assume that a cable shield is at earth ground potential. Both static
and electrical voltages can be present on a cable’s sheath.
6. Always follow standard safety procedures.
Sencore reserves the right to make changes in specifications and other information contained in this publication
without prior notice, and the reader should in all cases consult Sencore to determine whether any such changes have
been made. This manual may not be reproduced, and is intended for the exclusive use of Sencore users.
When in doubt, be careful.

DA795 DigiPro Digital Audio Analyzer Form7494 Operation Manual
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DA795
DigiPro
Digital Audio Analyzer
Operation Manual
(Firmware version 1.17)
3200 Sencore Drive, Sioux Falls, SD 57107

DA795 DigiPro Digital Audio Analyzer Form7494 Operation Manual
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TABLE OF CONTENTS
SAFETY PRECAUTIONS ...................................................................... inside front cover
DESCRIPTION................................................................................................................ 1
Introduction ............................................................................................................................1
Features.................................................................................................................................2
Specifications .........................................................................................................................4
Accessories............................................................................................................................6
I/O CONNECTIONS ........................................................................................................ 7
Input Panel (Bottom when viewing display) .......................................................................7
Digital Input 1.....................................................................................................................7
Digital Input 2.....................................................................................................................7
Power Adapter Input Jack..................................................................................................7
Power Switch.....................................................................................................................7
Battery Compartment.........................................................................................................7
Output Panel (Top when viewing display) ..........................................................................8
Digital Audio Outputs .........................................................................................................8
Analog Audio Outputs........................................................................................................8
Word 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 & Routing ...............................................................................................................10
Master Clock....................................................................................................................10
Output Clocking ...............................................................................................................10
USER INTERFACE....................................................................................................... 11
User Interface Features......................................................................................................11
Control Knob Operation ...................................................................................................11
Menus..............................................................................................................................11
Saving Preferred Settings ................................................................................................12
Top Toolbar ........................................................................................................................12
Function Control and Information.....................................................................................12
Input Control and Information...........................................................................................12
Bottom Toolbar...................................................................................................................13
Analog Output Control .....................................................................................................13
Digital Output and Generator Control...............................................................................14
ANALYSIS FUNCTIONS MENU................................................................................... 16
Bitstream Analyzer ...............................................................................................................17
Digital Watchdog ..................................................................................................................20
Clock/Sample Counter..........................................................................................................22
Bitscope ...............................................................................................................................23
Distortion Meter....................................................................................................................25

DA795 DigiPro Digital Audio Analyzer Form7494 Operation Manual
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DIGITAL TESTS MENU................................................................................................ 27
Digital Lock Test...................................................................................................................28
Video Lock 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 Tester..............................................................................................................50
Capture Sample Data...........................................................................................................51
Save Defaults.......................................................................................................................53
About....................................................................................................................................54
GLOSSARY .................................................................................................................. 55
WARRANTY & SERVICE INFORMATION............................................inside back cover

DA795 DigiPro Digital Audio Analyzer Form7494 Operation Manual
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DESCRIPTION
Introduction
The DigiPro Digital Audio Analyzer is a multi-function, dual-domain precision digital audio test
instrument.
The DigiPro provides a powerful, complete set of test, troubleshooting and utility functions for
digital audio analysis, in a hand-held DSP-powered device.
The DigiPro allows you to analyze any professional or consumer format stereo digital audio
signal, and generate low-noise digital test signals, all at up to 24-bit/96k-sample rate resolution.
Digital audio analysis features and functionality, normally found only on expensive bench test
equipment, are now available in a portable, easy-to-use and cost-effective package.
The DigiPro features a Transparency Test, Bit-Stream Analyzer, Lock Test, Bit-Scope, Latency
Test, Digital Watchdog, Jitter Meter, Clock/Sample Counter, Distortion Meter, and more!
The DigiPro provides all the connections you’ll need; two sets of AES/EBU and SP/DIF inputs,
including Toslink and ADAT, plus 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 analog to digital converters
(ADCs) or digital mixing consoles. Also included are ADAT sync and RS-232 serial for
computer interfacing.
Multi-Tasking
The DigiPro has independent input, output, and monitor sections. This allows simultaneous
analysis, signal generation, and analog headphone monitor.
Multi-Function
The DigiPro Digital Audio Analyzer employs a powerful DSP engine. All functions, filters, and
processing are implemented in DSP firmware algorithms. As each function is loaded into internal
memory and executed, the DigiPro takes on a completely new personality.
Precision Test & Measurement
The DA795 DigiPro digital analyzing and generator functions, with digital inputs, digital
outputs, and analog outputs, provide an integrated level of dual-domain test and troubleshooting
efficiency that smple digital monitoring devices can’t begin to offer. This allows you to easily
test digital signal integrity, check for digital equipment compatibility, and check for status
information that doesn’t match the audio data.

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Features
Bitstream Analyzer- Totally analyzes digital audio stream characteristics, checking header
status bytes, plus actual word length and sample rate, bit activity, and low voltage.
Digital Watchdog - Captures signal errors for a test period and graphs the errors.
Clock / Sample Counter - Measures the actual digital sample rate, word clock, and superclock
frequencies for a digital audio signal.
Bitscope - Shows distortion, noise or jitter on an S/D or X-Y scope, and also applies the results
to the internal speaker, headphones, and line output.
Distortion Meter - Measures THD+N (Total Harmonic Distortion & Noise)
Digital Lock Test - Tests whether a digital audio input (AES/EBU or S/PDIF format) is locked
to another digital audio input, word clock, superclock, ADAT input, or ADAT sync
(to <1ppm).
Video Lock Test – Tests whether a digital audio signal in AES/EBU, S/PDIF, or ADAT format
is locked (to <1ppm) with a video sync signal (black burst).
Transparency Test - Verifies that a device passes digital test waveforms without errors, using
either synchronous 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 analog device output.
Jitter Meter - Tests RMS interface jitter on a digital signal (to 150ps) or clock (to 35ps), as
referenced to an internal crystal or external master clock.
Level Meter - Monitors the level of a digital source signal. Numeric, VU (volume units), and
PPM (peak program meter) meters are available.
LAeq Dialog Level - LAeq refers to the "equivalent" average sound level, measured using A-
weighting which is most sensitive to speech intelligibility frequencies of the human
ear. LAeq is prescribed in the AC-3 DTV audio standard as the proper means to set
the "dialnorm" value, which sets the volume of dialog in every consumer DTV
receiver.
Signal Generator - Creates standard digital audio test signals with sine, square, white, and pink
waveforms.
Sweeps – Provides both amplitude and sine sweep modes.
Amplitude sweep generates a swept sine wave, outputs it to both the analog and digital outputs,
and measures the incoming digital audio signal level. Results are plotted on the
screen.
Sine sweep generates a swept sine wave, between two selected end frequencies, and repeats the
sweep until turned off.

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Pass Mode – Passes a digital input signal through to the output with any selected modifications.
Possible signal modifications include changing header information, performing
sample-rate conversion (from 44.1 kHz to 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 digital audio cables.
Capture Sample Data - Captures a buffer of data from the AES or SP/DIF input, and then
allows you to step through the buffer to examine the data, or search for particular
values.
Digital Monitor - Allows you to hear a digital signal with headphones or built-in speaker.

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Specifications
Digital Input/Output
Digital Signal Formats
AES-3
S/PDIF coaxial
S/PDIF optical (Toslink)
ADAT
BNC
Lock Detect
Lock detect: <1 ppm.
Digital Watchdog
Minimum Test Period: 1 minute
Maximum Test Period: 24 hours
Minimum length of detected error, all test times: 1 sample
Transparency Test
Maximum number of errors per channel: 65,536.
Maximum length of test: unlimited.
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 wave distortion: Better than –130 dB THD+N
Latency Test
Accuracy: ±2 samples
Jitter Meter
Jitter Range
AES/EBU or S/PDIF Input: 150 ps to 100 ns
Clock/Super clock Input: 35 ps to 100 ns
Jitter Accuracy: greater of ±5% of reading or ±10ps
Analog Output
Output voltage range:
Unbalanced: 0 dBu to –66 dBu
Balanced: +6 dBu to –60 dBu
Output voltage accuracy: ±1 dB
Sine wave distortion: Better than –85 dB THD+N
Standards
AES-3
VU/PPM: DIN 45406 (IEC 60268)

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General/Environmental
Input Impedances
XLR digital inputs: 110 kohms, nominal
S/PDIF digital inputs: 75 kohms, nominal
BNC Word Clock/Video input: 75 kohms, nominal
Output Impedances
XLR digital output: 110 ohms, nominal
S/PDIF digital output: 75 ohms, nominal
Word Clock digital output: 75 ohms, nominal
¼” Stereo Headphone analog output: 5 ohms, nominal
RCA phono unbalanced analog output: 110 ohms, nominal
Display: 64x128 pixel blue LCD with backlight
Size: 5 1/2" x 12 1/2" x 2 1/4" (HWD)
Weight: 4.5 lbs.
Temperature Range
5°C to 45°C, non-condensing
Power
Battery: Sealed Lead Acid 6 Vdc module.
AC adapter/charger: 100-240 Vac, 47-63 Hz, 7.5 Vdc, 4 A