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Audio Analyzer
SR1  Dual-domain audio analyzer
SR1 Audio Analyzer
· Analog/digital domain measurements
· −108 dB THD + N (at 1kHz, 20kHz BW)
· 200 kHz frequency range
· −114 dBu analyzer noise (20 kHz BW)
· ±0.008 dB flatness (20 Hz to 20 kHz)
Introducing SR1 Dual-Domain Audio Analyzer — high
performance audio analysis at a very affordable price.
SR1 is a stand-alone instrument that delivers cutting edge
performance in a wide variety of audio measurements. With a
versatile high-performance generator, an array of analyzers
that operate symmetrically in both the analog and digital
domains, and digital audio carrier measurements at sampling
rates up to 192 kHz, SR1 is the right choice for the most
demanding analog and digital audio applications.
· −140 dB input crosstalk
User Interface
· −125 dB output crosstalk
SR1 uses an integrated computer running the Windows XP
embedded operating system, so operation will be immediately
familiar and intuitive. Depending on the application, SR1 can
be operated with an external mouse and keyboard, or by using
the front-panel knob, keypad and touchpad.
· <800 ps jitter (700 Hz to 100 kHz)
· Dual-channel FFT measurements
· SR1 ... $6900 (U.S. list)
Stanford Research Systems
Seven on-screen tabbed pages are available for arranging
panels, graphs, and displays. Screen setups, data, and
instrument configurations can be quickly saved and recalled to
either the internal hard disk or to a flash drive connected to
one of the two front-panel USB connectors. An optional
1024 × 768 XVGA monitor (opt. 02) provides better resolution
and allows more information to be displayed.
While SR1’s configuration panels offer total flexibility in
setting up every detail of the analyzer, at times it is useful to
phone: (408)744-9040
SR1 AudioAnalyzer
get a measurement going quickly, without worrying about
infrequently used parameters. That’s where QuickMeas comes
in. QuickMeas gives SR1 users the ability to get up and
running on many common audio measurements such as Level,
SNR, Frequency Response, and Crosstalk after answering just
a few simple questions about the inputs and outputs of the
DUT. When the measurements are finished, the results are
available in a clear, easy-to-understand report.
Analog Signal Generator
At the heart of SR1 is a uniquely flexible analog signal
generator. All of the standard audio waveforms are available
including sine, synchronous burst sine, noise (white, pink, and
filtered), standard intermodulation test signals (SMPTE,
CCIF, DIM), square waves, arbitrary waveforms (ASCII and
.WAV), ramps and multitone waveforms. Many of these
signals can be combined in the generator allowing you to
create an unlimited number of test waveforms.
But the analog signal generator doesn’t sacrifice performance
for flexibility. With a flatness of ±0.008 dB (20 Hz to 20 kHz)
and a residual THD + N of –108 dB (20 Hz to 20 kHz), SR1’s
Low Distortion Sine rivals the performance of
any analyzer.
Multitone waveforms with up to 50 tones, each adjustable in
frequency, amplitude, and phase are calculated and loaded in
real-time, without having to run a cumbersome off-line
program to generate arbitrary waveform tables. A convenient
FFT Chirp waveform is automatically synchronized to the
FFT analyzer allowing instant FFT measurements of
frequency response (magnitude and phase).
Digital I/O Panels
The digital audio output sampling rate is continuously
adjustable from 24 kHz to 216 kHz (single and dual
connector). Full control over transmitted status bits (in both
professional and consumer formats), user bits, and validity
bits, is provided.
For digital interface testing, a variety of impairment signals
can be imposed on the digital audio carrier. Carrier
impairments include variable rise time (5 ns to 400 ns),
common mode sine waves, normal mode noise, and several
jitter waveforms (sine, square, and noise).
Analog and Digital Signal Generator Panels
All of SR1’s sampling clocks are derived from an internal
timebase with 2 ppm accuracy. For the most demanding
applications, an optional atomic rubidium (FS725) timebase is
available with an accuracy at shipment is ±5 × 10−11, and a
20-year aging specification of less than 5 ppb. Additionally,
the timebase may be synchronized to an external clock, an
AES11 reference signal, or any standard video signal.
Digital Audio Signal Generator
The same flexibility and performance is found in SR1’s digital
audio signal generator. Almost all the same waveforms found
in the analog generator are available in the digital generator
with the addition of several special digital test waveforms
including digital constant, walking bits, and a staircase
waveform (for D/A testing).
The heart of SR1’s measurement abilities is its versatile set of
analyzers which operate symmetrically on both analog and
digital audio signals with no need to purchase additional
options. Up to two analyzers can be run simultaneously on
either the analog or digital inputs.
Stanford Research Systems
phone: (408)744-9040
SR1 AudioAnalyzer
The Time Domain Detector makes all of the standard audio
measurements including Amplitude, Crosstalk, and THD + N.
Continuously variable bandwidth limiting and standard
weighting filters are included. The post notch-filter distortion
signal can be fed to an FFT analyzer for a live spectral display
of distortion, or to the rear-panel monitor output or speaker.
The Single-Channel FFT and Dual-Channel FFT Analyzers
offer live spectral displays with full zoom and heterodyne
capability. The full resolution of the analyzer can be applied to
any frequency range down to 1/512th of the full measurement
bandwidth, leading to an effective resolution of 16M FFT
lines. Several averaging algorithms can be applied to bring out
low level signals.
The two-channel FFT analyzer offers true single-shot
frequency response measurements for the ultimate in
accuracy. A flexible trigger makes a variety of phase
measurements possible.
The THD Analyzer makes frequency selective THD
measurements on two user-selectable sets of up to 13 harmonics
of the input signal.
The IMD Analyzer makes standard audio distortion
measurements including SMPTE, CCIF, and DIM. Frequency
selective analysis ensures high measurement accuracy.
The Histogram Analyzer displays live histograms of input
signal amplitudes and probability distributions. Realtime fits
to Gaussian distributions can be generated.
The Multitone Analyzer, in combination with the Multitone
Generator, can be configured to make fast single-shot
measurements of a variety of audio parameters including
Level, Frequency Response, THD + N, THD Total Distortion,
Noise, Crosstalk, and IMD.
Digital Audio Interface Measurements
Eye Diagram
Full color eye-diagrams can be generated allowing easy
testing against user-configurable eye limits.
Automation and Programming
SR1 offers unprecedented flexibility for user scripting and
remote programming. On-board scripts can be written in
VBScript, Jscript, or Python with full access to all of the
instrument’s capabilities as well as the ability to create simple
user-interfaces for running tests. SR1 has a complete
hierarchical GPIB command set, and GPIB commands can be
sent over the standard IEE-488 interface, RS-232 port, or over
the Ethernet on a TCP/IP network (VXI-11). Finally, SR1 has
a complete COM interface allowing instrument operation to
be automated from any COM capable application such as
Visual Basic, LabView, or Microsoft Office.
SR1 provides a complete set of measurements for digital
interface testing. Carrier level and sampling frequency are
measured directly. Status bits are fully decoded in both
professional and consumer formats, and user bits are
displayed as well. SR1’s Jitter Analyzer measures jitter in both
the time and frequency domain, including continuously
variable bandwidth limiting and weighting in both domains.
For frequency domain measurements, live zoomable and
heterodyned spectral displays of jitter are available. With a
residual jitter of only 800 ps, the performance of SR1’s jitter
analyzer is unbeatable.
An optional 80 MHz transient digitizer (opt. 01) provides
additional digital audio carrier analysis. Operating on a record
of up to 2M samples, the digitizer computes and displays the
time record of the input signal and its jitter, input spectrum,
jitter spectrum, and the probability distributions of the input
and jitter amplitudes as well as the pulse width and pulse rate.
Stanford Research Systems
SR1 Rear Panel
phone: (408)744-9040
SR1 Specifications
Analog signal Generator
General Characteristics
Constant (Offset)
Burst Types
Amplitude Range (rms) 10 µV to 28.8 V (balanced)
10 µV to 14.4 V (unbalanced)
Amplitude Accuracy
±0.7 % (±0.06 dB) at 1 kHz
Frequency Range
10 Hz to 200 kHz
High Res. DAC
10 Hz to 0.45 Fs (Fs: 128 kHz or
64 kHz fixed, 24 kHz to 216 kHz adj.)
Frequency Accuracy
±0.0002 % (2 ppm)
Frequency Resolution 6-digit
Output Configuration Balanced Ground, Balanced Float,
Unbalanced Ground, Unbalanced
Float, Common Mode Test
Source Impedance
50 Ω, 150 Ω , 600 Ω (balanced)
25 Ω, 75 Ω, 600 Ω (unbalanced)
Max. Power (600 Ω load)
30.5 dBm
24.9 dBm
Float Voltage
±40 V
10 Hz to 20 kHz –125 dB
>20 kHz
–100 dB
Low Distortion Sine (Hi BW DAC)
20 Hz to 20 kHz ±0.010 dB
10 Hz to 64 kHz ±0.022 dB
10 Hz to 200 kHz ±0.05 dB
Residual THD + N
1 kHz
–108 dB (22 kHz BW)
20 Hz to 20 kHz –108 dB (22 kHz BW)
–105 dB (80 kHz BW)
–101 dB (200 kHz BW)
10 Hz to 100 kHz –92 dB (200 kHz BW)
Normal Sine (Hi Res DAC, Fs=128 kHz)
20 Hz to 20 kHz ±0.008 dB
10 Hz to 57 kHz ±0.02 dB
Residual THD+N
20 Hz to 20 kHz –104 dB (22 kHz BW)
10 Hz to 57 kHz –93 dB (200 kHz BW)
Phased Sines
0 to 360°, 0.001° resolution
White, Pink, Filtered White/Pink,
1 to 50 tones (individually adjustable
in amplitude, phase, and frequency)
FFT Chirp
Equal power in each FFT bin.
Frequency response can be modified
with an EQ file.
10 Hz to 50 kHz frequency range
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Fs/N frequency range (N≥20),
adjustable rise/fall fraction
256 Samples to 136k Samples
10 Hz to Fs/4 frequency range
DC to 20 Vp (unbal) / 40 Vp (bal)
Timed, ext. triggered, ext. gated
Digital Audio Signal Generator
Digital Audio Carrier Characteristics
Output Amplitude
Output Format
10 mV to 10.24 V (110 Ω load)
±10 % + 80 mV
2 mV to 2.55 V (75 Ω load)
±10 % + 20 mV
Balanced XLR (AES/EBU),
dual-connector XLR, unbalanced
BNC (SPDIF-EIAJ), dual-connector
BNC, Optical (Toslink)
Output Sample Rate
24 kHz to 216 kHz
Sample Rate Accuracy ±2 ppm
Output Impedance
110 Ω (balanced)
75 Ω (unbalanced)
Digital Audio Waveforms
Frequency Range
Frequency Resolution
Phased Sine
10 Hz to Fs/2
±0.001 dB
–160 dB
0 to 360° range, 0.001° resolution
10 Hz to Fs/2 frequency range
White, Pink, Filtered White/Pink,
Fs/N frequency range (N≥20),
adjustable rise/fall fraction
256 Samples to 136k Samples
FFT Chirp
Equal power in each FFT bin.
Frequency response can be modified
with an EQ file.
10 Hz to Fs/4 frequency range
All allowed waveforms
Digital Test Waveforms Digital Constant, Count, Rotating
Bits, Staircase, J-Test
None, triangle and rectangular
probability distribution
phone: (408)744-9040
SR1 Specifications
Digital Audio Carrier Impairments
Frequency Range
Amplitude Range
Normal Mode Noise
Amplitude Range
Common Mode Sine
Amplitude Range
Frequency Range
Cable Simulation
Variable Rise Time
Sine, square, uniform noise,
BP filtered noise
2 Hz to 200 kHz
0 UI to 13 UI
0 to 637 mVpp
0 to 2.55 Vpp
0 to 20 Vpp (balanced only)
10 Hz to 100 kHz
Simulates 100 m of digital audio cable
5 ns, 10 ns, 20 ns, 30 ns or variable
from 40 ns to 400 ns
Signal Measurements
General Analog Input characteristics
Amplitude Range (rms) 62.5 mV to 160 V
Input Configuration
XLR, BNC, Generator Monitor,
Digital Audio Common Mode
Input Impedance
200 kΩ / 95 pF
100 kΩ / 185 pF
Input Termination (bal) 300 Ω, 600 Ω, none
10 Hz to 20 kHz –140 dB
>20 kHz
– 25 dB
16-bit sigma-delta
Sampling Freq.
512 kHz
Frequency Range DC to 200 kHz
Hi Resolution ADC
24-bit sigma-delta
Sampling Freq.
128 kHz or 64 kHz (fixed),
24 kHz to 216 kHz (adj.)
Frequency Range DC to 0.45Fs
General Digital Input Characteristics
Input Format
Input Sample Rate
Input Impedance
Balanced XLR (AES/EBU),
dual-connector XLR, unbalanced
BNC (SPDIF-EIAJ), dual-connector
BNC, Optical (Toslink)
24 kHz to 216 kHz
Hi Z or 110 Ω (balanced)
Hi Z or 75 Ω (unbalanced)
Analog Signal Meters
RMS Level Meter
Accuracy (1 kHz ref)
±0.7 % (±0.06 dB)
Stanford Research Systems
Flatness (1 kHz ref, Hi BW ADC, Fs=512 kHz))
20 Hz to 20 kHz <±0.008 dB
10 Hz to 64 kHz <±0.015 dB
10 Hz to 200 kHz <±0.05 dB
Frequency Meter
8 Hz to 300 kHz
±10 ppm
Phase Meter
±1.0° accuracy (10 Hz to 20 kHz)
Digital Signal Meters
Frequency Meter
Phase Meter
10 Hz to 0.45Fs, ±10 ppm accuracy
±0.05° accuracy (10 Hz to 0.45 Fs)
Analyzers (Analog and Digital Audio)
Time Domain Analyzer
Amplitude, amplitude ratio, THD+N,
THD+N ratio
Analog Inputs:
Amplitude Accuracy
±0.7 % (±0.06 dB)
Flatness (1 kHz ref)
20 Hz to 20 kHz <±0.008 dB
10 Hz to 64 kHz <±0.02 dB
10 Hz to 200 kHz <±0.05 dB
Residual Noise (1 Vrms Input Range)
High Res. ADC (Fs=128 kHz)
22 Hz to 22 kHz –116 dBu
22 kHz to 58 kHz –111 dBu
–118 dBu
22 Hz to 22 kHz –114 dBu
22 kHz to 80 kHz –111 dBu
200 kHz BW
–109 dBu
–116 dBu
Residual THD+N
High Res. ADC (Fs=128 kHz)
1 kHz
–110 dB (22 kHz BW)
20 Hz to 20 kHz –108 dB (22 kHz BW)
–101 dB (57.6 kHz BW)
1 kHz
–108 dB (22 kHz BW)
20 Hz to 20 kHz –107 dB (22 kHz BW)
–102 dB (80 kHz BW)
–97 dB (200 kHz BW)
10 Hz to 100 kHz –96 dB (200 kHz BW)
Digital Inputs:
Amplitude Accuracy
Residual THD+N
Residual Noise
±0.01 dB (at 1 kHz)
±0.01 dB (15 Hz to 22 kHz)
–139 dBFS
–141 dBFS
–147 dBFS
phone: (408)744-9040
SR1 Specifications
Bandwidth Limiting Filters
Low Pass Filter
4th order Butterworth, adj. from
Fs/40 to 0.45Fs, 20 kHz, 40 kHz
and 80 kHz fixed elliptical filters
per AES17.
High Pass Filter
4th order Butterworth, @ 22 Hz,
100 Hz, and 400 Hz. 20 kHz,
40 kHz and 80 kHz fixed elliptical
filters per AES17.
Band Pass Filter
Hi BW ADC 1/3 Octave, Class II (4-pole)
Hi RES ADC 1/3, 1/6, 1/12, 1/24 Octave,
Class III (6-pole)
Digital Audio 1/3, 1/6, 1/12, 1/24 Octave,
Class III (6-pole)
Tuning Range
Hi BW ADC 10 Hz to 200 kHz
Hi RES ADC 10 Hz to 0.44Fs
Digital Audio 10 Hz to 0.44Fs
Tuning Accur. ±2 %
Amplitude Accur.±0.5 %
Weighting Filters
A-wt, C-Msg wt, CCITT, CCIR
(weighted, unweighted, & 2 kHz)
Optional Filters
Up to 4 per channel (Hi BW only)
Detector Type
RMS, Peak, Quasi-Peak (CCIR-468)
Single-Channel and Dual-Channel FFT Analyzers
Frequency Range
DC to 200 kHz
Hi Res ADC
DC to 0.45Fs
Digital Audio
DC to Fs/2
Number of Lines
256, 512, ... 32k
40-bit floating point
Blackman Harris, Hanning,
Hamming, Equiripple, Flattop,
Gaussian, Kaiser, Uniform,
Rife Vincent 4, 5 and 10 term
Span can be narrowed by up to 512×
Narrowed span can be centered
anywhere in the measurement range
Linear and exponential
Dual-Ch. Meas.
Frequency response, coherence
THD Analyzer
Measures two independent sets of
user-selectable harmonics (2× to 14×)
IMD Analyzer
Histogram Analyzer
Time vs. amplitude, Histogram,
PDF, Gaussian fit to PDF
Multitone Analyzer
Level, Frequency Response,
THD+N, noise, THD, IMD,
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Digital Audio Carrier Measurements
Carrier amplitude, sample rate,
jitter amplitude, jitter spectrum
Sample Rate
24 kHz to 216 kHz
Sample Rate Accuracy ±2 ppm
Carrier Amplitude Measurements
Balanced (XLR) ±5 % + 60 mV
Unbalanced (BNC) ±5 % + 15 mV
Displays voltage of Toslink receiver
Output to Input Delay Measures delay from Digital Audio
Output or AES11 reference output
to Digital Audio Input
–12.7 UI to +115.1 UI in seconds
60 ns
Residual Jitter
700 Hz to 100 kHz 800 ps
50 Hz to 100 kHz 1 ns
Optional Digitizer
Sampling Rate
Acquisition Length
80 MHz
4k, 8k, 16k, 128k, 256k, 512k, 1M,
2M samples
Input vs. time, jitter vs. time, input
spectrum, jitter spectrum, pulse
width/rate histograms, jitter
probability histogram, eye diagrams
Computer Interfaces
Ref. Input Sources
Ref. Output Format
Video Out
GPIB, RS-232, Ethernet. All
instrument functions can be controlled.
AES3 (24 Hz to 216 kHz),
sine or TTL (8 kHz to 32 MHz),
AES3 (24 Hz to 216 kHz)
VGA output for driving external
90 to 264 VAC, 47 to 63 Hz, 250 W
17" × 8.5" × 20.25" (WHD)
40 lbs.
One year parts and labor on defects
in materials and workmanship
Ordering Information
Option 01
Option 02
Audio analyzer
80 MHz digitizer
High resolution display
Rubidium frequency standard
phone: (408)744-9040
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