Testing for Optimal Results
ATS-1
Audio Precision Quality in a
Low-Cost, Stand-Alone Test Set
Unmatched Value
System replacement for
obsolete equipment:
HP8903B emulation mode
over HPIB (GPIB)
Unparalleled Precision
ATS-1: Audio Precision Quality in a Stand-Alone Package
The ATS-1 family of audio test instruments—at home on the
bench, or in a test rack under GPIB control.
With thousands of units sold, you’ll find the ATS-1 family of audio analyzers in operation
around the world in maintenance, engineering and production facilities. Whether in broad
cast, communications, bench or production use, ATS-1 offers a complete easy-to-use audio
test set ready for almost any environment. With twelve different measurement functions
selectable at the push of a button, ATS-1 is comprehensive while remaining user-friendly. Its
popularity is no less due to its outstanding performance specifications; yet ATS-1 is as af
fordable as lower-performing test sets.
Analog Only or full Dual Domain—Analog and Digital
The ATS-1
ATS-1 Access includes comprehensive analog generation and measurement, with two outputs
and two inputs. Easy-to-set-up sweep capability produces graphs of frequency response, distortion vs. frequency and even amplitude sweeps. Non-volatile storage of up to 30 tests
allows easy one-button recall of your favorite test setup. Connect ATS-1 to a compatible
printer and produce reports incorporating high-resolution graphs. If you work with digital
audio, the ATS-1 Dual Domain® model adds AES3/SPDIF audio and interface measurement capabilities to the comprehensive analog capabilities of the ATS-1 family.
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Low Distortion
Analog System THD+N 80 kHz BW –92 dB
Digital Distortion THD+N £–140 dB
High Analog Bandwidth
Signal Generation to 120 kHz
Low Noise
22 Hz–22 kHz < –114 dBu
A-weighted < –118 dBu
Wide Input Voltage Range
Input Range 80 mV–250 V in 10 dB steps
Flat Response
20 Hz–20 kHz ±0.05 dB
Low Crosstalk
Input < –120 dB
Output < –110 dB
Low Jitter
Generator < 0.8 ns
Analyzer < 1.6 ns
Analog+Digital+AES3/SPDIF: the ATS-1 Dual Domain
ATS-1 Dual Domain® is a comprehensive audio test set for both analog and digital audio, as
well as for generation and measurement of AES3/SPDIF digital interface characteristics such
as jitter. Like our 2700 Series family of instruments, ATS-1 Dual Domain features true dual
domain architecture. Digital signals are generated and measured purely in the digital do
main, resulting in the extremely low distortion and noise residuals necessary for making
useful digital audio measurements.
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Performance, Measurement Power, and Ease-of-Use
Easy to Use
Measurement functions are simply selected
from the front panel. Just press a button
and make the
measurement. Se
lection of analog
and digital inputs
is clearly indi
cated on the front
panel with LED
legends. ATS-1
makes graphs of
swept measure
ments in real time
on the high contrast back-lit LCD display,
including both frequency and amplitude
sweeps. Hard copy high-resolution graphs,
compact screen-sized graphs or tabular data
listings can be made from your ATS-1 to la
ser or ink jet printers at the touch of a
button. Bargraphs can display measure
ments ranging from AC mains power line
distortion to digital interface error rate
…and nearly everything in between. Sepa
rate buttons and knobs provide independent
control of frequency and amplitude. The
buttons provide large and medium steps
(decade and 1/3 octave steps for frequency,
10 dB and 1 dB for amplitude), with knobs
for finer resolution. When not otherwise
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used, the setting knobs and
buttons also provide a con
venient human interface for
scrolling display cursors
and for entry of other set
tings and data.
Stereo:
ATS-1 Dual Domain is a true two channel instrument. Both analog and digital level
functions measure both inputs simultaneously. Phase and level ratio
measurements are also available.
Full Range of Analog & Digital Testing
Facilities:
ATS-1 Dual Domain provides complete and
parallel measurement capabilities for both
analog and digital audio signals. Measure
ments common to both domains include:
Amplitude, Noise, Level (2 channels simul
taneously), Frequency, Phase, THD+N,
SMPTE/DIN, IMD, Crosstalk and Level Ratio.
Standard A-weighting, CCIR 468, and LP/HP
filters are included in both domains. RMS
and quasi-peak (CCIR 468) detectors are
available in both domains.
Analog Performance:
The low distortion transformer-coupled ana
log generator supplies a full +30.17 dBu
(+29.5 dBm into 600 W) at selectable
(50 W, 150 W or 600 W) source imped
ances. Extremely low analyzer noise and
residual distortion support measurement of
high performance digital devices.
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Analog Convenience Functions:
In addition to the above measurements, the
analog GEN LOAD function measures the in
put resistance of your device at any
frequency you choose and makes swept impedance measurements (including
loudspeakers).
AC MAINS CHECK measures the voltage, frequency and distortion of the power line
without hazardous direct connections.
BARGRAPH display in AC MAINS CHECK function provides a visible history of maximum
and minimum mains voltage excursions.
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The dBg unit (dB referred to the present an
alog generator amplitude) is useful for
compression threshold measurements or
rapid response sweeps at several different
absolute levels, as well as for input to out
put gain/loss measurements.
600 W Analog Input Terminations are indi
vidually switchable for each channel of the
analog analyzer.
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Comprehensive Analog and
Digital Functions
Turn on ATS-1: Audio Testing to Meet Your Challenges
Digital Performance:
ATS-1 Dual Domain uses a true DSP-imple
mented analyzer for digital measurements,
which results in –130 dB residual THD+N,
0.01 dB flatness, and –140 dBFS residual
noise. Other mixed-signal test sets in the
same price range have no digital analyzer,
but use a D/A converter and an analog analyzer. These architectures “bottom out” at
–70 dB to –84 dB residual THD+N (12–14
bit effective performance), and 0.1 dB flatness. With today’s best A/D converters
measuring –108 to
–112 dB THD+N,
their real perfor
mance is invisible
to these mixed sig
nal analyzers
…buried under the
analyzer’s noise and
distortion floor.
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A competitive instrument lacking a
DSP analyzer produces false THD+N
readings (red trace) from a popu
lar A/D converter; but both the
ATS-1 Dual Domain and the Audio
Precision 2700 Series graph the
true performance of the converter
(from 5 dB to 28 dB lower), as
shown by the blue trace.
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Separate & Independent Analog & Digital
Generators:
Often necessary for dual domain testing.
You may, for example, drive the inputs of an
A/D converter with the low-distortion ana
log sine while simultaneously driving the
converter’s digital reference (house sync)
input with the digital generator. Then, add
jitter or vary the sample rate to see the ef
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fect on THD+N, IMD, or noise. Competitive
units can drive only one domain at a time
or use their analog generator to create the
digital jitter, and thus can’t make this mea
surement at all.
Separate Digital Inputs & Outputs:
Three I/O formats: XLR, BNC, and optical
(Toslink®). All are completely separate from
the analog audio XLR connectors, permitting both digital and analog generators to
operate simultaneously. No cable changes
required to go from A/D to D/A to D/D to
A/A testing of a digital tape machine, for
example.
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Digital & Analog Monitors:
Listen to all measurements in the digital
and analog do
mains over the
internal loud
speaker or a
pair of head
phones. In the analog domain, monitor
signals or distortion. In the digital domain,
the incoming signal, distortion, or jitter
can all be monitored.
Jitter Meter:
ATS-1 Dual Domain includes jitter measure
ment in nanoseconds or in Unit Intervals.
Two filter selections are provided for the
jitter meter: a 700 Hz high-pass filter used
for residual jitter measurements according
to AES standards, and a 50 Hz high-pass fil
ter for jitter response measurements.
Other Interface Signal Measurements:
ATS-1 Dual Domain measures key digital I/O
interface parameters in addition to jitter,
including sample rate, AES signal voltage,
frame delay through the device under test,
and delay of the input signal relative to a
house sync reference (frame or block).
Flexible Interface Impairment Simulation:
Flexible digital interface testing is vital for
troubleshooting and verifying performance
of digital audio at the systems level. ATS-1
Dual Domain allows simulation of real world
transmission and interface problems.
Vary the digital output signal to test the ac
ceptance range of your digital devices. Set
sample rate anywhere from 28.8 kHz to
99.9999 kHz, not just at the three standard
frequencies. Inject jitter amplitude from
0 UI to 2.5 UI (415 ns at 48 kHz) in
0.01 UI (1.6 ns) steps, or 0 UI to 25.5 UI
(4150 ns) in 0.1 UI (16 ns) steps.
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Injected jitter frequency can be set from
10 Hz to 38.8 kHz, not just to a fixed fre
quency. Adjust output signal amplitude
continuously from zero to 5.12 Volts in
5 mV increments, not just at a few steps.
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Independent Interface I/O Word Lengths:
Word length (resolution) of digital input
and output are independently set from 16
to 24 bits. Output resolution is set to match
the device under test to assure proper
dither. Input resolution must be set to ex
clude signal in the AUX bits or other lowlevel bit activity meaningless to the desired
measurement.
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Independent Input & Output Sample Rates:
Lets you test sample rate converters. Measurement of the incoming embedded audio
signal can be referred to the incoming sample rate, status byte indication of rate, or
the outgoing generator rate.
Dataü Error Testing Capability
for Digital Audio Signals:
Stimulate the test device with random data
and display current or totaled error mea
surements on both channels. The signal and
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analysis techniques are compatible with the
BITTEST feature of our System products, so
you can test a transmission link end-to-end
with an ATS-1 Dual Domain at one end and a
System Two, Cascade or 2700 Series dual
domain instrument at the other.
Other Digital Convenience Functions:
Digital Status bytes are displayed and set in
high-level English.
Error flag displays for confidence, lock, cod
ing, parity errors and the validity bit are
included.
Additional active bit and actual bit displays
on the panel help determine the word
length of the incoming signal and detect
stuck bits.
Dither amplitude is automatically set to the
proper value for the output word length
and the selected probability function.
Sample & Frame Sync:
Synchronize ATS-1 Dual Domain sample and
frame sync to the digital reference (house
sync) input.
Digital Pass Mode:
Sends the input digital audio content to
the output while modifying status bytes,
validity bit, etc. ATS-1 Dual Domain can
thus be used as a problem-solver between
incompatible equipment.
Signal Monitoring Outputs:
A digital signal appropriate for syncing an
external oscilloscope may be derived from
the input sample rate, output sample rate,
input block rate, output block rate, digital
audio waveform, jitter signal, or the de
tected interface errors. A buffered version
of the balanced AES3 signal from the XLR
input is also available, which coupled with
the high input impedance of the XLR in
bridging mode allows non-intrusive digital
line measurements with conventional
ground-referenced oscilloscopes.
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Digital Dither:
ATS-1 Dual Domain includes a full comple
ment of dither selections—triangular and
rectangular probability distribution func
tions; white or shaped spectrum.
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Versatile Connectivity
Choose among three different analog con
nector panels for your ATS-1. The connector
panel can be mounted on the front of your
instrument for convenience, or on the rear
of the instrument if you’d prefer your ATS-1
hard-wired in a rack. All the panels come
with extra dual banana and ground lugs. The
XLR panel allows for either balanced or unbalanced measurements by using a simple
dual banana-to-BNC (or to RCA phono)
adapter.
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Save & Recall Tests:
Save 30 instrument set
ups, including sweep re
sults data, time-stamped
from the internal clock
calendar. Use for
repeatable, easy bench and production test
ing or when in the field, for storing test
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Connectivity, Test Results and GPIB or HPIB Automation
tings and on-line help to speed up code
development. Measurement sweep data is
stored in the instrument for quick batch
transfers without holding up GPIB bus
traffic.
Settled GPIB Readings:
Reliable measurements are assured by algo
rithms inside the instrument which
automatically compensate for varying de
vice settling speeds. Settling can be
disabled for measurements of jitter or other
ATS-1 prints graphs, panel setups and mea
sured data either to laser (PCL compatible)
or inkjet printers. Front panel keys select
two sizes of graph output (including cursor
data), tabular sweep data, bargraphs and
front panels for printing.
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instantaneous values.
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GPIB Software Drivers
Audio Precision supports the ATS-1 with a
National Instruments LabView and
LabWindows CVI driver for C and Basic pro-
grammers. The LabWindows driver runs with
National Instruments GPIB interface cards
for personal computers. The driver speeds
development of test routines by eliminating
the need to learn the ATS-1 programming
mnemonics.
HP8903B GPIB Emulation Mode
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data to be printed or analyzed later. Each
saved test includes all settings for the en
tire instrument, a default description or
your own title for the test, the date and
time, and the last test sweep result data.
ATS-1 also emulates the HP8903B audio an
alyzer HP command set for a simple
IEEE-488.2 GPIB Port:
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An IEEE-488.2 GPIB interface port is in
cluded on the ATS-1. The commands closely
model the front panel interface to make
software development more productive. ATS1 provides full query back of all manual set
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replacement of slow and outdated equip
ment in existing systems. A front panel
button selects between the Audio Precision
488.2 (GPIB) command mode and the HPIB
command mode.
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ANALOG SIGNAL OUTPUTS
Low Distortion Sine Wave
Frequency Range 10 Hz to 120 kHz
Frequency Accuracy ±0.5 %
Amplitude Range (20 Hz to 30 kHz)
Balanced <0.25 mV to 26.25 Vrms [–70 dBu to
Unbalanced <0.25 mV to 13.12 Vrms [–70 dBu to
Amplitude Accuracy ±0.2 dB [±2.3 %] at 1 kHz
Amplitude Resolution 0.01 dB
Flatness (1 kHz ref)
10 Hz–20 kHz ±0.05 dB
Residual THD+N
25 Hz–20 kHz £(0.0025% + 3 µV), 80 kHz BW [–92 dB]
Square Wave
Frequency Range 20 Hz–30 kHz
Amplitude Range
Balanced 0.71 mVpp to 34.73 Vpp
Unbalanced 0.71 mVpp to 17.36 Vpp
Amplitude Accuracy ±0.3 dB [±3.5 %] at 400 Hz
Rise/fall time Typically 2.5–3.0 µs
SMPTE (or DIN) Test Signals with option “ATS-IMD”
LF Tone 50, 60, 70, or 250; all ±1.0 %
HF Tone Range 7 kHz or 8 kHz (±1 %)
Mix Ratio 4:1 (LF:HF)
Residual IMD 0.0015 % [–96.5 dB], 60 Hz + 7 kHz
OUTPUT CHARACTERISTICS
Source Configuration Selectable balanced or unbalanced
Source Impedances
Balanced 50 W (±2 W), 150 W (±2 W), or
Unbalanced 50 W (±2 W)
Output Current Limit 75 mA peak
Max Output Power
Balanced +29.9 dBm into 600 W (Rs = 50 W)
Unbalanced +23.8 dBm into 600 W (Rs = 50 W)
Output Related Crosstalk
(10 Hz–20 kHz)
+30.6 dBu]
+24.6 dBu]
or 250 Hz + 8 kHz
600 W (±6 W)
£–110 dB or 10 µV, whichever is
greater
ANALOG ANALYZER
ANALOG INPUT CHARACTERISTICS
Input Ranges 80 mV to 250 V in 10 dB steps
Maximum Rated Input 350 Vpk, 140 Vrms (dc to 20 kHz);
Input Impedance
Balanced (each side) Nominally 100 kW // 150–200 pF
Unbalanced Nominally 100 kW // 150–200 pF
Terminations Selectable 600 W ±1 %
CMRR 80 mV–2.5 V range ³70 dB, 50 Hz–20 kHz
Input Related Crosstalk
10 Hz–20 kHz
Wideband Amplitude/Noise Function
Measurement Range <1 µVrms to 140 Vrms [–118 dBu to
Accuracy (1 kHz) ±0.2 dB [±2.37 %] unweighted
Flatness (1 kHz ref) ±0.05 dB (20 Hz–20 kHz)
Bandwidth Limiting Filters
LF –3 dB <10 Hz; 400 Hz ±5 % (3-pole)
HF –3 dB 22 kHz; 30 kHz; 80 kHz (3-pole), or
Weighting Filters ANSI-IEC “A”; CCIR-QPK; CCIR-ARM;
Optional Filters Up to 2 (Aux 1 and Aux 2)
Detection RMS (i=60 ms); AVG; QPK (CCIR
Residual Noise
22 Hz–22 kHz BW £1.5 µV [–114 dBu]
A-weighted £1.0 µV [–118 dBu]
CCIR-QPK £5.0 µV [–104 dBu]
Frequency Meter Related (both channels)
Measurement Range 10 Hz–200 kHz
Accuracy ±0.01 % [±100 PPM]
Resolution 5 digits
Phase Measurement Related
Measurement Ranges ±180, +90/–270, or –90/+270 deg
Accuracy 20 Hz–20 kHz ±2.0 deg
Resolution 0.1 deg
Level Meter Related (both channels)
Measurement Range 10 mV to 140 V for specified
Accuracy (1 kHz) ±0.1 dB + 100 µV
Flatness (1 kHz ref) (Vin >10 mV) ±0.05 dB
Bandpass Amplitude Function
Tuning Range (f
Bandpass Response Q=5 (2-pole)
Accuracy (at fo) ±0.3 dB, 20 Hz–120 kHz
THD+N / SINAD Function
Fundamental Range 10 Hz to 100 kHz, THD+N mode
Measurement Range .001 %–100 %
SINAD Range 400 Hz–1 kHz
Accuracy ±1 dB, 20 Hz–120 kHz harmonics
Measurement Bandwidth
LF –3 dB <10 or 400 Hz
HF –3 dB 22k, 30k, 80k, or 300 kHz
Residual THD+N
25 Hz–20 kHz £(0.0025% + 3.0 µV), 80 kHz BW
Crosstalk Function
Frequency Range 10 Hz to 120 kHz
Measurement Range –140 dB to 0 dB
Accuracy ±0.5 dB
) 20 Hz to 120 kHz
O
overload protected
£–120 dB or 1 µV, whichever is
greater
+45 dBu]
300 kHz
CCIR-RMS
Rec 468)
accuracy and flatness, useable to
<100 µV [–38 dBu to + 45 dBu]
(20 Hz–20 kHz)
[–92 dB]
SMPTE (DIN) IMD Function with option “ATS-IMD”
Test Signal Compatibility 40–250 Hz and 3 kHz–20 kHz in
IMD Measured Amplitude modulation products of
Measurement Range <0.0025 %–20 %
Accuracy ±1 dB per SMPTE RP-120-1983,
Residual IMD £0.0025% [–92 dB], 60 + 7 kHz or
Wow & Flutter Function
Test Signal Compatibility 2.80 kHz–3.35 kHz
Accuracy (4 Hz) ±(5 % of reading + 0.002 %)
Detection Modes IEC/DIN; NAB; JIS
Residual W+F £0.005% Weighted; £0.01%
0:1 to 8:1 ratio
the HF tone.
DIN 45403
250 + 8 kHz
Unweighted
DIGITAL SIGNAL GENERATOR
DIGITAL OUTPUT CHARACTERISTICS
Output Formats AES/EBU (per AES3-1992); SPDIF-
Sample Rates 28.8 kHz–99.9999 kHz
Sample Rate Accuracy ±0.002% [±20 PPM] lockable to
Word Length 16 to 24 bits (even values)
Sine Wave
Frequency Range 10 Hz to 47 % of sample rate
Frequency Resolution Sample Rate ¸ 2
Flatness ±0.001 dB
Residual Distortion ±0.00001 % [–140 dB]
Square Wave
Frequency Range 10 Hz to 1/6 sample rate
Frequencies available fs¸ 4096 to fs¸ 6, in even integer
SMPTE/DIN IMD Waveform with option “ATS-IMD”
Upper Tone Range Choice of 7 kHz or 8 kHz
Lower Tone Range Choiceof 50 Hz, 60 Hz, 70 Hz, or 250 Hz
Amplitude Ratio 4:1 (LF:HF)
Residual Distortion £0.00001 % [–140 dB] at 4:1 ratio
Random Generator Waveform
Waveform Compatible with Audio Precision
Dither (all waveforms)
Probability Distribution Triangular or rectangular;
Spectral Distribution Flat (white) or Shaped (+6 dB/oct,
Amplitude Automatically tracks word length or off
EIAJ; Optical
external reference
(22.56 kHz at 48 ks/s)
(typically 0.006 Hz at 48 ks/sec)
divisors
BITTEST
independent for each channel
triangular only)
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AES/EBU INTERFACE GENERATION
Interface Signal
Amplitude Range
Balanced (XLR) 0–5.11 Vpp, into 110 W in 5 mV steps
Unbalanced (BNC) 0–1.62 Vpp, into 75 W in 1.6 mV steps
Channel Status Bits English language decoded,
Validity Flag Selectable, set or cleared
AES/EBU Impairments
Induced Jitter Sine wave
Jitter Freq Range 10 Hz to 38.8 kHz
Jitter Amplitude 0–1.28 UI (pk), in steps of 0.005 UI
Residual Jitter (totalgenerator/analyzer)peak calibrated
RMS response £0.005 UI (700 Hz–30 kHz BW)
Peak response £0.015 UI (700 Hz–30 kHz BW)
Spurious Jitter Products
Jitter & Ref Delay Off £0.0005 UI
Jitter On £–30 dB below jitter signal
REFERENCE INPUT CHARACTERISTICS
Input Formats AES/EBU (per AES3-1992)
Input Sample Rates 28.8 kHz–99.9999 kHz
Lock Range ±0.0025% [±25 PPM]
Professional/Consumer
or better
1.3–12.75 UI, in steps of 0.05 UI or
better
DIGITAL ANALYZER
DIGITAL INPUT CHARACTERISTICS
Input Formats AES/EBU (per AES3-1992); SPDIF-
Sample Rates 28.8 kHz–99.9999 kHz
Word Length 16 to 24 bits
EMBEDDED AUDIO MEASUREMENTS
Wideband Level/Amplitude
Range 0 dBFS to –140 dBFS
Frequency Range <10 Hz–22.0 kHz at 48 ks/sec
Accuracy ±0.01 dB, ³–90 dBFS
Flatness ±0.01 dB, 15 Hz–22 kHz
High pass Filters 22 Hz, 400 Hz, 2-pole Butterworth
Low pass Filters 15 kHz, 20 kHz 6-pole elliptic low-
Weighting Filters ANSI-IEC “A” weighting; CCIR QPK;
Residual Noise –140 dBFS unweighted; –142 dBFS
EIAJ; Optical
pass
CCIR RMS
A-weighted
Narrow Band Amplitude
Frequency Range 0.04% to 40% of sample rate
Filter Shape 10-pole, Q=19 (BW = 5.3% of f0)
THD+N Measurements
Fundamental Range 0.02% to 45% of sample rate
Residual THD+N £–138 dBFS
High pass Filters 22 Hz, 400 Hz 2-pole Butterworth
Low pass Filters 15 kHz, 20 kHz 6-pole elliptic low-
Weighting Filters ANSI-IEC “A” weighting; CCIR QPK;
SMPTE (DIN) IMD Function with option “ATS-IMD”
Test Signal Compatibility 40–250 Hz and 3 kHz–20 kHz in 1:1
IMD Measured Amplitude modulation products of
Measurement Range <0.0001%–10%
Accuracy ±1 dB per SMPTE RP-120-1983,
Residual IMD (0 dBFS) £0.0001% [–120 dB], 60 + 7 kHz or
Frequency Measurements
Range 5 Hz to 47% of sample rate
Phase Measurement Related
Measurement Ranges ±180, +90/–270, or –90/+270 deg
Accuracy ±2.0 deg (20 Hz–20 kHz)
Resolution 0.1 deg
BITTEST Measurement
Measurement Compatible with random mode of
(10 Hz–19.2 kHz at 48.0 ks/sec)
(10 Hz–22.0 kHz at 48.0 ks/sec
pass
CCIR RMS
to 4:1 ratio
the HF tone.
DIN 45403
250 + 8 kHz
Audio Precision BITTEST
DIGITAL INTERFACE MEASUREMENTS
AES/EBU Impairments, Real Time Displays
Input Sample Rate ±0.002% [±20 PPM] internal ref,
Output to Input or Reference
Input to Input Delay
AES/EBU Input Voltage
Balanced 400 mV to 10.24 Vpp,
Unbalanced 100 mV to 2.56 Vpp,
Jitter Amplitude (500 Hz) (peak-peak sine wave calibrated)
Jitter Flatness ±1.5 dB, 100 Hz–22 kHz (50 Hz HP
Residual Jitter, peak calibrated (analyzer only) (700 Hz–30 kHz
Spurious Jitter Products £0.002 UI (1.2 kHz) or 0 dB below
Channel Status Bits English language decoded
Validity Flag Displayed for selected channel
Parity; Signal Confidence;
Receiver Lock; Coding Error
±0.0001% [*1 PPM] external ref
Measures status propagation from
the AES/EBU output to the input.
Range is 0–192 (frames), resolution
±60 ns.
±(10% + 50 mV)
±(10% + 30 mV)
0–10 UI,
selection, RMS detection, 48 kHz
sample rate)
BW)£0.01 UI RMS; £0.03 UI Peak
jitter signal
(Professional/Consumer)
Displayed for total signal (both
channels combined)
AUXILIARY SIGNALS
Generator Analog Sync Output; Digital Sync Output; Analyzer Input
Monitor; Analyzer Reading
AUDIO MONITOR
Power Output Typically 1 watt
GENERAL / ENVIRONMENTAL
Power Requirements 100/120/230/240 Vac (–10%/+6%),
Temperature Range 0° C to +50° C Operating; –20° C to
Humidity 90% RH to at least +40° C (non-
EMC Complies with 89/336/EEC, CISPR 22
Dimensions 16.5 x 6.0 x 13.6 inches [41.9 x 15.2
Weight Approximately 20 lbs [9.1 kg]
Safety Complies with 73/23/EEC,
50–60 Hz, 50 VA max
+60° C Storage
condensing)
(class B), and FCC 15 subpart J (class B)
x 34.5 cm]
93/68/EEC, EN61010, and IEC 1010
(including Amendments 1 and 2)
Complete ATS-1 specifications are downloadable
from the Products area of the Audio Precision
Web site at audioprecision.com.
CHANNEL
A
ANALOG
INPUT
CHANNEL
B
INPUT
TERMINATION
INPUT
TERMINATION
INPUT
PREAMP
and
ATTENUATOR
INTERMOD
DEMODULATOR
WOW &
FLUTTER
DISCRIMINATOR
BAND PASS
BAND REJECT
FILTER
PHASE/FREQ
COMPARATORS
ATS-1 Dual Domain Block Diagram
MEASUREMENT
AMPLIFIER
WEIGHTING
FILTERS
INTERMODULATION DISTORTION OPTION
PRIMARY
READING
DETECTOR
SECONDARY
READING
DETECTOR
MICROPROCESSOR
SQUARE
WAVE
GENERATOR
MAIN
OSCILLATOR
SIGNAL
SUMMATION
IMD HF TONE
GENERATOR
LCD DISPLAY
OUTPUT
AMPLIFIER
BALANCING
TRANSFORMER
SOURCE
IMPEDANCE
OUTPUT
ATTENUATOR
CHANNEL
A
ANALOG
OUTPUT
CHANNEL
B
ANALOG
TRIGGER
OUTPUT
FUNCTION
MONITOR
INPUT
MONITOR
SPEAKER/
HEADPHONE
MONITOR
IEC60958
INPUT
AES3
INPUT
OPTICAL
INPUT
AES3
REFERENCE
INPUT
OPTICAL
RECEIVER
M
U
X
SYNC
AC/DC
AES3
RECEIVER
JITTER
DETECTOR
DELAY
LOGIC
A-to-D
Ordering Information
ATS-1A ATS-1 Access Audio Test System with GPIB interface
ATS-1DD ATS-1 Dual Domain (digital and analog) Audio Test System with
GPIB interface
Select panel type and front or rear connections at time of order:
ATS-BNC: BNC and banana jack connector panel
ATS-XLR: XLR and banana jack connector panel
ATS-PHJ: ¼-inch phone and banana jack connector panel
ATS-R: Rear mount (front mount connector panel is default)
Options and Accessories for ATS-1 Instruments
ATS-IMD SMPTE/DIN intermodulation distortion measurement and generation
RAK-ATS Rack mount shelf for ATS-1 Access or ATS-1 Dual Domain
MAN-ATSA Additional ATS-1 Access operator’s manual (one included with
MAN-ATSDD Additional ATS-1 Dual Domain operator’s manual (one included with
MAN-ATS488 Additional GPIB manual for ATS-1 Access or ATS-1 Dual Domain (one
SVC-ATS Service manual for ATS-1 Access or ATS-1 Dual Domain
CAB-XMF Set of four XLR male to XLR female cables
CAB-XBR Set of four XLR male/female to RCA/BNC cables
CAB-AES Set of two AES3 digital cables, 1 meter
CAB-AES2 Set of two AES3 digital cables, 2 meters
CAB-AES4 Set of two AES3 digital cables, 4 meters
(analog and digital)
instrument)
instrument)
included with instrument)
DSP
JITTER
GENERATOR
BUYING AN ATS-1 ANALYZER FOR
ANALOG AND DIGITAL AUDIO:
What to look for when evaluating competitive instruments
Digital Architecture and Features:
Not all analyzers that accept a digital
input signal are actually digital ana
lyzers. Does the instrument have a
real (DSP-implemented) digital do
main analyzer, or just a D/A converter
from the digital input connector to an
analog hardware analyzer? This latter
approach in a competitive unit yields
distortion performance in the 12–14
bit range (–70 to –85 dB THD+N, for
example). There’s just not that much
12-bit digital audio around to mea
sure anymore. ATS-1 Dual Domain’s
digital analyzer guarantees –130 dB
residual distortion (nearly 22 bit per
formance), far in excess of the
–108 to –112 dB actual linearity of
today’s best A/D converters.
Analog Performance: Does the in
strument have an analog hardware
generator and an analog hardware an
alyzer? Some competitive units (at
twice the price of ATS-1 Dual Domain)
use DSP techniques for all generation
and analysis, so analog signals pass
MODULATOR
JITTER
GENERATOR
TRANSMITTER
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CLOCK
AES3
MONITOR
D-to-A
Generator Waveform Trigger
Input Clock
Jitter Signal
Output Clock
DRIVER
M
U
X
OPTICAL
DRIVER
DIGITAL
TRIGGER
OUTPUT
IEC60958
OUTPUT
AES3
OUTPUT
OPTICAL
OUTPUT
through converters inside the instrument. The result is THD+N as high as
–79 dB, flatness as poor as –0.2 dB
—inadequate for most modern audio
devices.
Interface Testing: Does the instrument have independent analog, digi
tal, and jitter generators? If it can
only provide analog or digital output
at any one time, you can’t test a
house-synchronized A/D converter for
jitter rejection. Without independent,
flexible digital audio and jitter gener
ators, you can’t measure jitter sensi
tivity of a D/A converter at various
audio and jitter frequency combina
tions.
True Dual Domain: True Dual Domain
hardware by definition guarantees a
full range of analysis capabilities in
both analog and digital domains. Ev
eryone measures level and some mea
sure THD+N (although implemented
with extremely limited performance,
as noted above). Be sure that other
useful measurements such as IMD
(Intermodulation Distortion), Phase,
and Crosstalk are available for both
analog and digital signals, not just
analog.
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pn 0057.0002 rev 0
removable carrying handle.
ATS-1 includes a
Portable and self-contained, take your
ATS-1 with you on the road.
Testing for Optimal Results
5750 SW Arctic Drive
Beaverton, Oregon 97005
Tel 503-627-0832 Fax 503-641-8906
US Toll Free 1-800-231-7350
email: sales@audioprecision.com
web: audioprecision.com
IV0930135135
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