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Stanford Research Systems SR865 User Manual

Stanford Research Systems SR865
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Revision 1.25
Operation Manual
SR865
2 MHz DSP Lock-in Amplifier

Table of Contents

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Stanford Research Systems SR865 Specifications

General IconGeneral
TypeLock-in Amplifier
Dynamic Reserve100 dB
Frequency Range1 mHz to 100 kHz
Input Impedance10 MΩ
Time Constants10 μs to 10 s
Harmonic Distortion< 0.1%
Output Filters12 dB/octave, 24 dB/octave
Reference InputTTL, Sine
Reference Phase Shift0 to 360 degrees
Reference Frequency1 mHz to 100 kHz
OutputsX, Y, R, θ
DisplayLCD
InterfaceUSB, GPIB
Power Supply100-240 VAC

Summary

Safety and Preparation

SR865 Specifications

Chapter 1 Getting Started

Chapter 2 Lock-in Amplifier Basics

Chapter 3 Operation

Front Panel Output Control

Explains how to configure front panel outputs with offset, ratio, and expand functions.

Front Panel Functions

Explains Auto Phase, Auto Range, Auto Scale, and Save/Recall functions.

Chapter 4 Programming

Command Syntax and Conventions

Defines the structure of commands, arguments, variables, and query formats.

Reference Control Commands

Lists commands for controlling reference source, frequency, phase, and harmonic detection.

Signal Input Commands

Covers commands for setting input mode, coupling, range, sensitivity, and filters.

Scan Commands

Details commands for configuring and executing parameter scans.

Data Transfer and Capture Commands

Explains commands for transferring, capturing, and streaming data.

System and Interface Commands

Covers commands for time/date, timebase, file settings, and communication interfaces.

Status Reporting Commands

Lists commands for querying device status, errors, and event registers.

Appendix A Advanced Filters

Appendix B The FFT Display

Appendix D Data Streaming and Capture

Data Capture Functionality

Explains internal capture buffer, data format, capture rate, and capture modes.

Appendix E Dual Reference Detection

Appendix F Fuse Installation and ac Line Select

Appendix G Performance Tests

Sine Output Amplitude and Flatness

Verifies amplitude accuracy and frequency response of the internal sine output.

Frequency Accuracy Test

Tests the accuracy of the lock-in's internal frequency counter.

Phase Accuracy Test

Measures the phase accuracy of the internal oscillator Sine Out.

Input Noise Measurement

Measures the lock-in's input noise characteristics.

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