Table of Contents

Condensed Information

 

SAFETY and Preparation for use

1

Symbols

2

Specifications

3

Front Panel Summary

5

Abridged Command List

7

Status Byte Definition

8

Configuration Switches

8

Guide to Operation

 

Front Panel

9

Signal Inputs

9

Signal Filters

9

Sensitivity

9

Dynamic Reserve

10

Status Indicators

10

Display Select

10

Channel 1 Display

10

R Output

11

Output Channel 1

11

Rel Channel 1

11

Offset Channel 1

11

Expand Channel 1

12

X (RCOSØ) Output

12

Channel 2 Display

12

Ø Output

12

Output Channel 2

13

Rel Channel 2

13

Auto Phase

13

Offset Channel 2

13

Expand Channel 2

14

Y (RSINØ) Output

14

Reference Input

14

Trigger Level

14

Reference Mode

15

Reference Display

15

Phase Controls

15

Time Constants

15

Noise Measurements

15

Power Switch

16

Local/Remote Operation

16

Default Settings

16

Rear Panel

17

AC Power

17

GPIB (IEEE-488) Connector

17

RS232 Connector

17

Signal Monitor Output

17

Pre-Amp Connector

17

A/D Inputs and D/A Outputs

17

Ratio Feature

17

Internal Oscillator

17

Guide to Programming

 

Communications

19

Command Syntax

19

Status LED's

19

RS232 Echo Feature

20

Try-out with an ASCII Terminal

20

Command List

21

Status Byte

24

Errors

24

Reset Command

25

Trouble-Shooting Interface Problems

25

Common Hardware Problems

25

Common Software Problems

25

RS232 Interface

 

Introduction to the RS232

26

Data Communications Equipment

26

Wait Command

26

Termination Sequence

26

GPIB (IEEE-488) Interface

 

Introduction to the GPIB

26

GPIB Capabilities

26

Response to Special GPIB commands

26

Serial Polls and SRQ's

27

Echo Mode using the RS232

27

Using Both the RS232 & GPIB

27

Lock-in Technique

 

Introduction to Lock-in Amplifiers

28

Measurement Example

28

Understanding the Specifications

29

Shielding and Ground Loops

29

Dynamic Reserve

30

Current Inputs

30

Bandpass Filter

30

Notch Filters

31

Frequency Range

31

Output Time Constants

31

Noise Measurements

31

Ratio Capability

31

Computer Interfaces

31

Internal Oscillator

31

SR530 Block Diagram

 

Block Diagram

32

Signal Channel

33

Reference Channel

33

Phase-Sensitive Detector

33

DC Amplifier and System Gain

33

Microprocessor System

33

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SRS Labs SR530, Lock-In Amplifier manual Table of Contents

SR530, Lock-In Amplifier specifications

The SRS Labs Lock-In Amplifier, model SR530, is a powerful tool designed for high-precision measurements in the realm of scientific research and industrial applications. This state-of-the-art instrument excels in extracting small signals from noisy environments, making it an invaluable asset for experiments in fields such as physics, engineering, and materials science.

One of the main features of the SR530 is its ability to perform synchronous detection, which is key to improving signal-to-noise ratios. By utilizing a reference signal, the device correlates the incoming signal with the reference to effectively filter out noise, allowing for the accurate measurement of weak signals that might otherwise be obscured. This process of phase-sensitive detection is fundamental to the operation of the Lock-In Amplifier.

The SR530 offers a wide frequency range, covering from 0.1 Hz to 100 kHz. This broad frequency response allows it to handle a diverse array of signals, making it suitable for various applications including optical detection, capacitance measurements, and in many cases, voltammetry. The device is also equipped with multiple inputs and outputs, facilitating the integration with other laboratory equipment and enabling complex experimental setups.

Precision is further enhanced with its adjustable time constant, which allows users to optimize the response time based on experimental needs. The user can choose time constants from 10 microseconds to 10 seconds, accommodating fast dynamic measurements as well as those requiring stability over longer durations.

Another remarkable characteristic of the SR530 is its digital processing capabilities. The device features a highly accurate digital voltage measurement system, minimizing drift and ensuring long-term stability. Additionally, the use of microprocessors enhances data handling and allows for features such as programmable settings, facilitating automated measurements.

Moreover, the SR530 includes a range of output options, including analog outputs, which can be used for direct signal processing, as well as digital interfaces for integration with computers. This ensures that users can not only capture high-fidelity data but also analyze and display it efficiently.

In conclusion, the SRS Labs SR530 Lock-In Amplifier stands out due to its sophisticated technology, versatile features, and robust performance. Its precision, flexibility, and ease of use make it an ideal choice for researchers and engineers looking to unlock the potential of weak signal measurement in complex environments.