SRS Labs SR530, Lock-In Amplifier manual Front Panel Summary

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Front Panel Summary

Signal Inputs

Single Ended (A), True Differential (A-B), or Current (I)

Signal Filters

Bandpass:

Q-of-5 Auto-tracking filter (In or Out)

 

Line Notch:

Q-of-10 Notch Filter at line frequency (In or Out)

 

2XLine Notch: Q-of-10 Notch Filter at twice line frequency (In or Out)

Sensitivity

Full scale sensitivity from 100 nV to 500 mV RMS for voltage inputs

 

or from 100 fA to 500 nA RMS for current inputs.

Dynamic Reserve

Select

Dynamic Reserve

Stability

Sensitivity Ranges

 

LOW

 

20 dB

5 ppm

1 µ V to 500 mV

 

NORM

 

40 dB

50 ppm

100 nV to 50 mV

 

HIGH

 

60 dB

500 ppm

100 nV to 5 mV

Status Indicators

OVLD

Signal Overload

 

 

 

UNLK

PLL is not locked to the reference input

 

ERR

Illegal or Unrecognized command

 

ACT

RS232 or GPIB interface Activity

 

REM

Remote mode: front panel has been locked-out

Display Select

Channel 1

Channel 2

 

 

 

X (RcosØ)

Y (RsinØ)

 

 

 

X Offset

 

Y Offset

 

 

 

R (Magnitude) Ø (Phase)

 

 

 

R Offset

Ø (no offset)

 

 

X Noise

 

Y Noise

 

 

 

X5 (D/A)

X6 (D/A)

 

 

Analog Meters

Displays Channel 1 and 2 Outputs as a fraction of full scale

Output LCD's

Displays the Channel 1 and 2 Outputs in absolute units

Output BNC's

Channel 1 and 2 Outputs follow Analog Meters, ± 10 V for ± full scale

Expand

Multiplies the Channel 1 or 2 Analog Meter and Output voltage by a factor X1 or X10.

REL

Set the Channel 1 or 2 Offset to null the output: subsequent readings are relative

 

readings. REL with phase display performs auto-phasing. REL with X5, X6 display

 

zeroes the D/A outputs.

 

 

Offset

Enables or Disables Offset, and allows any offset (up to full scale) to be entered. X, Y,

 

and R may be offset and X5, X6 may be adjusted. Phase is offset using the reference

 

phase shift.

 

 

 

X BNC

X (RcosØ) output, ± 10V full scale

 

Y BNC

Y (RsinØ) output, ± 10V full scale

 

Reference Input

1 MΩ Input, 0.5 Hz to 100 KHz, 100 mV minimum

Reference Trigger

Trigger on rising edge, zero crossing, or falling edge

f/2f Mode

PLL can lock to either X1 or X2 of the reference input frequency

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Contents Model SR530 Page Table of Contents Appendix C Gpib NON-OPERATING OperatingPage SR530 Specification Summary Gpib DemodulatorFront Panel Summary Enbw Abridged Command List Status Byte Definition Configuration SwitchesSignal Filters Signal InputsSR510 Guide to Operation Front Panel SensitivityStatus Dynamic ReserveDisplay Select Channel 1 DisplayOutput Channel OutputRel Channel Offset ChannelExpand Channel Rcosø OutputChannel 2 Display Auto Phase Rsinø Output Reference InputTrigger Level Phase Controls Reference ModeReference Display Time ConstantPower DefaultsLocal and Remote SR530 Guide to Operation Rear Panel Page SR530 Guide to Programming Command SyntaxCommunicating with the SR530 Front Panel Status LEDsTry-Out with an Ascii Terminal RS232 Echo and No Echo OperationLOW Norm High SR530 Command ListN1,n2,n3,n4 Page Errors Status ByteBit Trouble-Shooting Interface Problems ResetCommon Hardware Problems include Common Software Problems includeSR530 with the Gpib Interface SR530 with the RS232 InterfaceSerial Polls and Service Requests Gpib with RS232 Echo ModeSR530 with Both Interfaces Measurement Example Lock-in TechniqueShielding and Ground Loops Understanding the SpecificationsPage Page SR530 Block Diagram Phase Sensitive Detectors Signal ChannelReference Channel DC Amplifiers and System GainCircuit Description Demodulator and Low Pass Amplifier Reference OscillatorExpand Analog Output and ControlFront Panel Microprocessor ControlPower Supplies RS232 InterfaceGpib Interface Multiplier Adjustments Amplifier and Filter AdjustmentsCalibration and Repair Replacing the Front-End Transistors Notch FiltersNon-Essential Noise Sources Appendix a Noise Sources and CuresPage Page Appendix B Introduction to the RS232 Case 1 The Simplest ConfigurationBaud Rate Case 2 RS232 with Control LinesParity Stop BitsVoltage Levels Final TipBus Description Appendix C Introduction to the GpibProgram Example IBM PC, Basic, via RS232 Appendix D Program ExamplesProgram Example IBM PC, Microsoft Fortran v3.3, via RS232 Page #include stdio.h Program Example IBM PC, Microsoft C v3.0, via RS232Page Program Example 4 IBM PC,Microsoft Basic, via Gpib ′INCREMENT X6 Output by 2.5 MV Program Example HP85 via Gpib Documentation PC1 Oscillator Board Parts ListSW1 DpdtBR1 Main Board Parts ListBR2 BT1SR530 Component Parts List SR530 Component Parts List PIN D 22U MINGpib Shielded CX1CY1 FU1MPSA18 SR530 Component Parts List SR530 Component Parts List SR530 Component Parts List SR530 Component Parts List SR530 Component Parts List SPSTX8 4PDTSR513 Assy SR530 Component Parts List Static RAM, I.C Z80A-CPUTranscover TIE AnchorMica #4 FlatFront Panel Board Parts List RED LD1 LD2LD3 Quad Board Parts List SR530 Component Parts List PC1 SR530 Component Parts List Miscellaneous Parts List SR530 Component Parts List

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.
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