Lambda SR1 User manual

SR1 Audio Analyzer
Operation Manual
Stanford Research Systems
Audio
Revision 3.0.0 January, 2014
Distribution in the UK & Ireland
Lambda Photometrics Limited
Lambda House Batford Mill
Harpenden Herts AL5 5BZ
United Kingdom
E: [email protected]
W: www.lambdaphoto.co.uk
T: [phone]
F: [phone]
Characterisation,
Measurement &
Analysis

SR1 Operation Manual2
© 2014 Stanford Research Systems
Table of Contents
Foreword 0
Part I Getting Started 6
................................................................................................................................... 61Unpacking and Safety
................................................................................................................................... 8
2Manual Revision History
................................................................................................................................... 9
3Overview
................................................................................................................................... 13
4User Interface
................................................................................................................................... 19
5A Quick Example...
Part II SR1 Operation 28
................................................................................................................................... 281File Menu
.......................................................................................................................................................... 29Save SR1 Configuration
.......................................................................................................................................................... 30
Save Partial Configuration
.......................................................................................................................................................... 31
Load Configuration
.......................................................................................................................................................... 32
Print SR1 Scre e n
.......................................................................................................................................................... 33
Print Se tup
................................................................................................................................... 342Edit Menu
................................................................................................................................... 35
3Panels Menu
.......................................................................................................................................................... 36Analog Generator Panel
......................................................................................................................................................... 41
Analog Generator Units
......................................................................................................................................................... 43
Analog Generator Waveforms
.......................................................................................................................................................... 57
Digital Generator Panel
......................................................................................................................................................... 60
Digital Generator Units
......................................................................................................................................................... 62
Digital Generator Waveforms
.......................................................................................................................................................... 76
Analog Inputs Panel
.......................................................................................................................................................... 79
Digital I/O Panel
.......................................................................................................................................................... 87
Channel Status Panel
.......................................................................................................................................................... 90
Use r Status Pane l
.......................................................................................................................................................... 91
Sw eep Panel
.......................................................................................................................................................... 98
Settling Panel
.......................................................................................................................................................... 100
Monitors Panel
.......................................................................................................................................................... 102
Multitone Panel
.......................................................................................................................................................... 105
Clock Reference Panel
................................................................................................................................... 1074Analyzers Menu
.......................................................................................................................................................... 108Com m on Analyze r Fe ature s
......................................................................................................................................................... 110
Analyzer Units
.......................................................................................................................................................... 115
Time Domain Detector
.......................................................................................................................................................... 127
FFT (Single Channel)
.......................................................................................................................................................... 141
FFT (Dual Channel)
.......................................................................................................................................................... 157
THD Analyzer
.......................................................................................................................................................... 161
IMD Analyzer
.......................................................................................................................................................... 165
Multitone Analyzer
.......................................................................................................................................................... 171
Histogram Analyze r
.......................................................................................................................................................... 175
Octave Analyzer
.......................................................................................................................................................... 177
Jitter Analyzer
.......................................................................................................................................................... 183
Dig it iz e r

3Contents
© 2014 Stanford Research Systems
................................................................................................................................... 1915Displays Menu
.......................................................................................................................................................... 192Graph
......................................................................................................................................................... 199
Trace Calculator
.......................................................................................................................................................... 202
Bar Ch ar t
.......................................................................................................................................................... 205
Digit iz e r Dis p lay
.......................................................................................................................................................... 212
Other Display Menu Options
................................................................................................................................... 2136Tools Menu
.......................................................................................................................................................... 214Preferences Panel
.......................................................................................................................................................... 220
Events Panel
.......................................................................................................................................................... 226
Switcher Configuration Panel
.......................................................................................................................................................... 230
Hardware Status
.......................................................................................................................................................... 231
Networking
......................................................................................................................................................... 231
Netw ork Setup
......................................................................................................................................................... 232
Netw ork Places
......................................................................................................................................................... 233
Map Netw ork Drive
......................................................................................................................................................... 233
Remov e Netw or k Dr iv e
......................................................................................................................................................... 234
Share SR1
.......................................................................................................................................................... 236
Computer Functions
......................................................................................................................................................... 236
Printers Panel
......................................................................................................................................................... 237
Ejec t Dr iv e
......................................................................................................................................................... 237
Pow er Options
......................................................................................................................................................... 238
Date Time
......................................................................................................................................................... 238
Virtual Keyboard
......................................................................................................................................................... 238
Updating SR1
................................................................................................................................... 2417Automation Menu
.......................................................................................................................................................... 242Rem ote Interface Panel
.......................................................................................................................................................... 243
Scripting Window
.......................................................................................................................................................... 252
Learning Mode
................................................................................................................................... 2538Quick Measurement Menu
.......................................................................................................................................................... 254Setup Panel
.......................................................................................................................................................... 255
SNR Pane l
.......................................................................................................................................................... 257
Reference Panel
.......................................................................................................................................................... 259
Level Panel
.......................................................................................................................................................... 261
THD+N Pan e l
.......................................................................................................................................................... 263
Frequency Response Panel
.......................................................................................................................................................... 265
Distortion Panel
.......................................................................................................................................................... 267
IMD Panel
.......................................................................................................................................................... 269
Crosstalk Panel
.......................................................................................................................................................... 271
Interchannel Phase Panel
.......................................................................................................................................................... 273
In/Out Phase
.......................................................................................................................................................... 275
Automated Measurements and Reports
................................................................................................................................... 2789Setups Menu
.......................................................................................................................................................... 279Analog-Analog
.......................................................................................................................................................... 281
Analog-Digital
.......................................................................................................................................................... 283
Digital-Analog
.......................................................................................................................................................... 285
Digit al- Dig it al
.......................................................................................................................................................... 287
Digital IO
................................................................................................................................... 28810 Help Menu
Part III SR1 Reference 291
................................................................................................................................... 2911Front Panel Description

SR1 Operation Manual4
© 2014 Stanford Research Systems
................................................................................................................................... 2932Rear Panel Descritpion
................................................................................................................................... 296
3Specifications
................................................................................................................................... 305
4Filter Reference
................................................................................................................................... 306
5File Reference
................................................................................................................................... 310
6Hardware Reference
Index 312

Part
I
Getting Started
Audio

SR1 Operation Manual6
© 2014 Stanford Research Systems
1Getting Started
1.1 Unpacking and Safety
Removing the Instrument From Its Shipping Container
Use care in removing the instrument from its shipping container. The SR1 weighs approximately 50 lbs,
and can be awkward to handle while being removed from the box. In particular, please take care that the
front panel LCD screen is not damaged while unpacking. Retain the original packing materials in case
the unit ever needs to be returned for service.
Connecting The Power Cord
Your SR1 was shipped with a power cord appropriate to your location. SR1 operates from a 100V, 120V,
220V or 240V nominal AC power source with a line frequency of 50 or 60 Hz. Before connecting the
power cord to the rear panel power entry module, please ensure the the LINE VOLTAGE SELECTOR
card, located in the rear panel fuse holder, is set so that the correct AC input voltage value is visible.
The fuse rating should also be checked to see if it matches the line voltage setting. For 100V/120V
operation a 4A fuse is used. For 220V/240V a 2A should be installed. The instrument has a 3-wire power
cord. Be sure to connect it to a properly grounded outlet to guard against electrical shock.
After connecting the power cord to an AC power source, the unit can be turned on by pressing the power
button at the lower left of the front panel. The green power LED above the power button illuminates to
indicate the unit is on. After turning the power on the unit will take about 50 seconds to run through its
boot-up sequence before it is ready for use.
Safety
Dangerous voltages, capable of causing injury or death, are present in this instrument.
Use extreme caution whenever the instrument cover is removed. Do not remove the
instrument's cover while the power cord is connected to a live outlet. Do not expose the
instrument to rain or excessive moisture. Do not attempt to disconnect the internal
cooling fans or block the fan vents.
Service
Refer all servicing to qualified, SRS-authorized service personnel. Do not attempt to substitute parts or
perform any unauthorized modification to the instrument. Contact SRS for instructions on how to return
the instrument for authorized service, calibration, or adjustment.
Stanford Research Systems
1290-D Reamwood Ave.
Sunnyvale, CA, 94089
USA
p
hone 408.744.9040
email info
@
thinksrs.com
web www.thinksrs.com

Getting Started 7
© 2014 Stanford Research Systems

SR1 Operation Manual8
© 2014 Stanford Research Systems
1.2 Manual Revision History
Copyright © 2009-2014 Stanford Research Systems, Inc.
All rights reserved
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying, recording, or by any information storage and retrieval system
without permission in writing from Stanford Research Systems, Inc.
Manual Revision History
Version Date Author Comments
1.0 1/06 jahan Original Version
2.0 7/09 ajm Preliminary Version shipped with first SR1s
2.1 10/09 ajm 2nd Preliminary version
2.2 12/09 ajm Complete Through Tools Menu
2.3 1/10 ajm Complete Manual
2.4 3/10 ajm For SR1 v 1.1
2.5 3/10 ajm Minor Printing Corrections
2.6 5/10 ajm Updated for SR1 v1.1.6
2.7 7/10 ajm Updated for SR1 v1.2
2.8 6/11 ajm Updated for SR1 v1.4
3.0 1/14 ajm Updated for SR1 v2.1.13
Copyright and Trademark Acknowledgements
Windows is a trademark of the Microsoft Corporation
Apache Xerces
Copyright 1999-2007 The Apache Software Foundation
This product includes software developed at The Apache Software Foundation (http://www.apache.org/).
Portions of this software were originally based on the following:
- Software copyright (c) 1999, IBM Corporation., http://www.ibm.com.
- Software copyright (c) 1999, Sun Microsystems., http://www.sun.com.
- Voluntary contributions made by Paul Eng on behalf of the Apache Software Foundation that were
originally developed at iClick, Inc., software copyright (c) 1999.
NI-Device
Copyright © 2009 National Instruments Corporation, All Rights Reserved
FastReport
Copyright © 2009 Fast Reports, Inc., All Rights Reserved

Getting Started 9
© 2014 Stanford Research Systems
1.3 Overview
SR1 is versatile and complex instrument capable of making a wide a variety of precision audio
measurements in both the analog and digital domains. The following is a brief introduction to the different
pieces of SR1 and their capabilities.
Measurement Setups
SR1 includes pre-configured setups for many common audio measurements. To get up and running
quickly, see the Setups Menu.
Generators
SR1 contains precise and flexible analog and digital audio generators. Each generator is built around
several core waveforms which can be either generated individually or combined in the generator and
output as a composite signal. For the Analog Generator, the core waveforms include Sine, Low-Disortion
Sine, Phased Sine, Noise, USASI Noise, Squarewave, Ramp (triangle), FFT Chirp, Multitone, Arbitrary,
and Constant (offset). The analog generator can be output either as a balanced or unbalanced signal and
ouputs a maximum peak output voltage of 20 V (unbalanced) or 40 V (balanced).
The Digital Generator offers the same core waveforms as the analog generator and additionally offers a
number of waveforms optimized for digital interface testing including Digital Constant, Digital Counter,
Walking Bits, and a J-test waveform designed to test the jitter susceptibility of devices.
Analog Inputs
SR1 offers both balanced and unbalanced analog inputs with full scale input ranges from 160 Vrms down
to 62 mVrms. SR1's analog inputs are autoranging, meaning that for most input signals, the analyzer
automatically sets the input range without any user interaction.
Digital Audio Inputs and Outputs
SR1 has 2 sets of XLR and BNC connectors and is compatible with both consumer and professional
digital audio signals from 50 mVpp up to 10.2 Vpp. All significant parameters of the digital audio carrier
signal are measured including signal amplitude, digital audio effective sampling frequency, and input/
output delay. Status bits are fully decoded in both the the professional and consumer standards. User
bits are also displayed in raw binary format.
Several impairment signals can be applied to the output digital audio carrier including Common Mode
Sinewave, Normal Mode Noise, and Jitter. Jitter waveforms include Sine, Square, Noise, and Bandpass
Noise with a peak jitter amplitude of ~13UI.
Analyzers
There are 8 different types of Analyzers in SR1, summarized below.
Time Domain Detector Makes wideband amplitude, ratio, and THD+N measurements. The time
domain detector signal chain includes bandpass or notch filters, bandwidth
limiting filters, and a variety of different weighting filters. Peak, RMS and
Quasi-Peak responses are selectable
FFT (1 ch) Provides single-channel FFT functionality.Measurements include power
spectrum, time record, phase. Both zoom (changing the FFT frequency
range) and heterodyne (moving the FFT frequency range) are included.
FFT (2 ch) Provides dual-channel FFT functionality.Measurements include power
spectrum and time record for both channels, plus frequency response

SR1 Operation Manual10
© 2014 Stanford Research Systems
(transfer function), and interchannel phase. Zoom (changing the FFT
frequency range) is supported in the dual-channel analyzer.
THD Analyzer Makes frequency selective Total Harmonic Distortion (THD) measurements,
both ratio and absolute. Includes the ability to measure only selected
harmonics.
IMD Analyzer Makes standard Intermodulation Distortion measurements including
SMPTE/DIN, CCIF (difference frequency), and DIM/TIM.
Multitone Analyzer Makes single-shot multitone measurements allowing fast measurements of
common audio parameters including noise, distortion, and level.
Jitter Analyzer Measures the jitter of the digital audio carrier in both the time and frequency
domain including variable high and low pass filtering.
Histogram Analyzer Creates histograms of the analog and digital audio input signals.
Octave Analyzer Displays 1, 1/3, and 1/12 fractional octave spectra.
Each type of analyzer has a corresponding panel with the appropriate controls for that analyzer and
readouts for the analyzer's measurements. At any instant, there are two active analyzers, designated A0
and A1. The user can select the type of A0 and A1 from any of the allowed analyzer types. Each
analyzer has controls which set the input domain to analog or digital audio and select the appropriate
input channel.
For analog inputs SR1 offers an additional choice between two Analog-to-Digital converters, each
optimized for different measurements. The high-bandwidth (Hi BW) 16-bit ADC operates at a fixed
sampling rate of 512 kHz. The high-resolution (Hi Res) ADC is a 24-bit converter which operates at fixed
sampling rates of 128 kHz and 64 kHz and and variable rates which can be synchronized with the digital
audio output or input signal to perform cross-domain measurements.
Sweeps and Free Run
SR1 operates in two different measurement modes: free-run and sweep. In free-run mode the analyzers
make continuous measurements and continually updates the measurement results on the analyzer
panels.The second mode, sweep mode, requires that several options be set. First, a sweep source must
be configured which determines whether SR1 will be sweeping an internal parameter (e.g. generator
frequency) over a specified range, an externally measured parameter (e.g. input frequency), or at regular
time intervals. Once the sweep source is configured the user must select the measurements (up to 6)
that will be recorded during the sweep. Swept measurements must be settled to be included in the
sweep meaning that the transient variability of the measurement must drop below a user set value before
being included in the sweep result. Sweep sources and data are setup on the Sweep Panel, while
Settling parameters are set in the Settling panel.
Displays
Three different types of displays are available for graphically displaying measurement data. The graph is
the main display type and is capable of displaying many different live and off-line data traces both.
Graphs include cursors for reading out absolute and delta values, the ability to export to bitmap and
Windows Metafiles, movable onscreen annotations, and a variety of data calculations (smoothing,
linearity, maximum and minimum, etc.) for manipulating data. The Bar Chart is a simpler display
optimized for displaying a single measurement value which reports the instantaneous value of the
measurement as well as maximum, minimum, and standard deviation. The Digitizer Display is designed
to work with the optional digitizer and displays various measurements calculated by the digitizer
including full-color eye diagrams.