SRS Labs Lock-In Amplifier User Manual download pdf (Page 10)

Phase Controls Adjust phase in smoothly accelerating 0.025° steps, or by

90° steps. Press both 90° buttons to zero the phase.

Reference LCD Display reference phase setting or reference frequency

Time Constants Pre-filter has time constants from 1 mS to 100 S (6 dB/Octave)

Post-filter has time constants of 0, 0.1 or 1.0 S (6 dB/Octave)

ENBW Equivalent Noise Bandwidth. Specifies the bandwidth when making

Noise measurements. (1Hz or 10 Hz ENBW)

Power Switch Instrument settings from the last use are recalled on power-up

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 81 82

MODEL SR530 1
Table of Contents 3
SR530 Specification Summary 7
Front Panel Summary 9
Abridged Command List 11
Status Byte Definition 12
SR510 Guide to Operation 13
Front Panel 13
Dynamic Reserve 14
Display Select 14
Channel 1 Display 14
Output Channel 1 15
Rel Channel 1 15
Offset Channel 1 15
R Output 15
Expand Channel 1 16
X (RCOSØ) Output 16
Channel 2 Display 16
Ø Output 16
Output Channel 2 17
Rel Channel 2 17
Auto Phase 17
Offset Channel 2 17
Expand Channel 2 18
Y (RSINØ) Output 18
Reference Input 18
Trigger Level 18
Reference Mode 19
Reference Display 19
Phase Controls 19
Time Constant 19
Noise Measurements 19
Local and Remote 20
Defaults 20
SR530 Guide to Operation 21
Rear Panel 21
SR530 Guide to 23
Programming 23
RS232 Echo and No Echo 24
Operation 24
SR530 Command List 25
Status Byte 28
Trouble-Shooting Interface 29
Problems 29
The SR530 with the RS232 30
Interface 30
The SR530 with the GPIB 30
GPIB with RS232 Echo Mode 31
The Lock-in Technique 32
A Measurement Example 32
Shielding and Ground Loops 33
SR530 Block Diagram 36
The Signal Channel 37
Reference Channel 37
Phase Sensitive Detectors 37
DC Amplifiers and System Gain 37
A Microprocessor Based Design 37
Circuit Description 38
Reference Oscillator 39
Demodulator and Low Pass 39
Amplifier 39
RS232 Interface 41
GPIB Interface 41
Power Supplies 41
Internal Oscillator 41
Calibration and Repair 42
Notch Filters 43
Appendix A: 44
Noise Sources and Cures 44
Appendix B: 47
Introduction to the RS232 47
Stop Bits 48
Voltage Levels 48
Final Tip 48
Appendix C: 49
Introduction to the GPIB 49
Appendix D: 50
Program Examples 50
Program Example 1: 50
IBM PC, Basic, via RS232 50
Program Example 2: 51
IBM PC, Microsoft Fortran 51
Program Example 3: 53
IBM PC, Microsoft C v3.0 53
Program Example 4: 55
IBM PC,Microsoft Basic 55
Program Example 5: 57
HP85 via GPIB 57
Documentation 58
SR530 COMPONENT PARTS LIST 59

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SRS Labs Lock-In Amplifier User Manual Page 10

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