DSA-1 AES/EBU Digital Interface Analyzer Specifications
HARDWARE
| I/O CONNECTORS | |
| DI (digital audio input) formats: | 110 Ohm balanced (AES3, IEC958, 'AES/EBU') 75 Ohm coaxial (IEC958, 'S/PDIF', or AES3-ID) Optical TOSLINK (CP340) |
| DO (digital audio output) formats: | 110 Ohm balanced (AES3, IEC958, 'AES/EBU') (loop-thru, re-clock and generator) 75 Ohm coaxial (IEC958, 'S/PDIF', or AES3-ID) REF SYNC input formats: 110 Ohm balanced (AES3/IEC958/AES11 or 'Wordclock') 75 Ohm coaxial (AES3/IEC958/AES3-ID or 'Wordclock') |
| Balanced connectors: | 3-pin 'XLR', inputs female, outputs male |
| Coaxial connectors: | BNC, with phono (RCA) adapters provided |
| Input & output impedances: | ±4% |
| Regenerated DO amplitude: | XLR: 4.4V P-P ±5% into 110 Ohms |
| Coaxial S/PDIF: | 0.5V P-P ±5% into 75 Ohms |
| Coaxial AES3ID: | 1.0V P-P ±5% into 75 Ohms |
| DI/REF SYNC fs range: | 28kHz - 52kHz |
| DO internally-generated fs: | 44.1kHz, 48.0kHz to TCXO accuracy |
| Oscilloscope (Test Out) outputs: | LINE and SYNC: x10, 75 Ohm, BNC, transformer isolated |
| RS-232 serial port: | PC-AT-type 9-pin male 'D' connector, 1200-9600 baud, no parity, 8 data bits, 1 stop bit, galvanically isolated from measurement circuits |
| DC adapter input: | 9V to 12V @ 1000mA, 2.1mm DC 'barrel' socket, positive on inner |
| ANALOGUE MONITORING D/A CONVERTER | |
| THD+N : | 0.01%, -80dB (@1kHz,-0.5dBFS) |
| Frequency Response: | 20Hz-20kHz |
| Outputs: | Stereo 6.3mm headphone jack, plus internal loudspeaker |
| TCXO (frequency) accuracy: | ±3ppm 0-60C, as standard, ±0.5ppm to special order |
| PLL responses (re-clocking and jitter measurement): | Loop filter -3dB LF corner at 700Hz/1.5kHz |
| Jitter gain at any frequency: | < 1dB |
| Intrinsic jitter: | <700ps (fc=1.5kHz), <1.2ns (fc = 700Hz) |
CARRIER ANALYZER
| FS MEASUREMENT | |
| Range: | 28kHz to 52kHz |
| Accuracy, internal: | set by TCXO as above |
| Accuracy, external (wrt ref): | <1ppm for 1 week |
| JITTER/EYE MEASUREMENT | |
| Type: | Self-calibrating, peak-to-peak measurement |
| Range: | > 100ns P-P |
| Low frequency range (-3dB): normal mode: absolute (ref) mode: | PLL fc (700Hz or 1.5kHz) to <50Hz |
| Accuracy: | < ±10% plus residual jitter |
| Residual jitter: | <800ps at fc=1.5kHz, <1.5ns at fc=700Hz |
| CARRIER AMPLITUDE MEASUREMENT | |
| Type: | Auto-ranging with HF true-peak detector |
| Range: | 0 - greater than 20V P-P |
| Frequency range, -3dB: | wide-band: 300Hz-40MHz low-band: 28Hz-20kHz |
| Accuracy: | < greater of ±5% and ±40mV |
| CARRIER PHASE MEASUREMENT | |
| Range: | ±180( (50%) |
| Accuracy: | better than ±1.4( (0.39%) |
DATA ANALYZER
| AUDIO METER READOUT | |
| Range, dBFS mode: | -138dBFS to 0dBFS |
| Accuracy, dBFS mode: | ±0.01dB above -90dBFS ±0.1dB above -105dBFS ±0.5dB above -120dBFS |
| Accuracy, HEX mode: | absolute |
SIGNAL GENERATOR/EDITOR
| SYNCHRONISATION | |
| Sync sources: | AES11, Wordclock, Int (44.1kHz, 48kHz), AES3/IEC958 DI (in-line editing mode) |
| GENERATOR 1 | |
| Audio function: | Sine, square, triangle, ramp, pulse (with programmable polarity and duration), J-test (cable-jitter stimulator) |
| Frequency: | At fs=48kHz:
DC, 250, 500, 750, 1k, 1k5, 2k, 2k5, 3k, 4k, 5k, 6k,
7k, 8k, 9k, 10k, 11k, 12k, 13k, 14k, 15k, 16k, 17k,
18k, 19k, 20k, 21k, 22k, 23k, 24k; Frequencies scaled for other sampling rates |
| Amplitude: | 0dBFS, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -18, -20, -24, -30, -36, -42, -48, -50, -60, -70, -80, -90, -100, -110, -120dBFS (-14dBFS, = +4dBu for +18dBu=0dBFS) |
| Audio word-length: | 12-bits to 24-bits in 1-bit steps |
| Channel Status: | All fields can be explicitly generated/edited; entire Channel Status pattern can be captured from a reference source |
| Validity: | Can be set to 0 (valid) or 1 (invalid) |
| A and B sub-frames: |
Split mode: Each channel may have different
audio function, frequency, amplitude, wordlength, Channel
Status and Valid bit if required In-line edit mode: Audio, Channel Status and Valid bit may be independently edited or passed through |
| GENERATOR 2 | |
| Audio function: | fs/4 sine, J-test (cable-jitter stimulator), PRS (pseudo-random sequence, white noise); |
| Channel Status: | Professional or Consumer, with correct fs and CRC |
| Jitter generator function: | PRS-H (wide-band noise), PRS-L (audio-band noise), fs/8 sine, long-cable simulation |
| Jitter generation Amplitude P-P: | 0 to 3UI/8 in UI/8 steps, (20.3ns steps at fs=48kHz); UI/12 steps at fs=32kHz |
| Jitter generation - Amplitude accuracy: | ±10% |
| In-line edit mode: | Jitter generation can be added to the incoming signal |
| CHANNEL CHECKER | |
| Description: | Monitors any AES3 transmission medium and logs any bit-errors against time |
| Sub-frames tested: | A, B or both |
| Word-length: | 16, 20 or 24-bit |
| Time-stamp range: | 1000 hours |
| WATCHDOG | |
| Description: | Monitors a selectable range of carrier and data parameters and logs fluctuations |
| Selectable parameters: | Carrier fail/relock, biphase/parity error, eye-width< 50%, incorrect block-length/carrier phase, audio-band detection on carrier, fs (sampling-rate) base-value and accuracy, Audio-bit activity (main, low-main and auxiliary), Valid bit, User bit activity, Channel Status: Professional/Consumer, emphasis, sub-frame match, CRC errors, copy protection, channel mode; |
| Time-stamp range: | 1000 hours |
| MICROSCOPE | |
| Description: | Digital gain for examination of low-level signals, dithering schemes etc. |
| Gain range: | 0 to +90dB in 6dB steps |
| Input word-length mask: | 16, 20 or 24-bit |
| Clipping indicators: | A and B sub-frames independently |
| RESULTS LOG | |
| Non-volatile log capacity: | 4095 bytes |
| Logged functions: | Carrier tests, Data tests, Test Sequences, Generator/editor settings, Channel Check, Watchdog |
| Printing/uploading: | Prints to serial printer during measurements or later from non-volatile log, or uploads to host PC |
| Printer baud rates: | 1200, 2400, 4800, 9600 |
| HOST SUPPORT | |
| Host PC requirement: | 386 CPU or better, spare RS-232 serial port, MS-Windows 3.1 or above |
| Support programs (MS-Windows): | Test-Sequence Compiler/downloader, Results Log uploader/editor; |
| Support programs (MS-DOS): | Firmware loader, Macro processor |
| PHYSICAL | |
The DSA-1 is supplied in a flight
case with the following accessories:
| |
| Weight of complete kit in flight case: | 6.0kg |
| Weight of DSA-1 analyzer (with battery): | 1.8kg |
| DSA-1 dimensions: | 233mm x 130mm x 65mm (H x W x D) |
| Flight case dimensions: |
300mm* x 400mm x 120mm *(325mm with handle, latches etc) |
Specifications subject to amendment.
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