23200 mV

24500 mV

Note that sensitivity settings below 100 nV are allowed only when a pre-amplifier is connected.

H

The H command reads the pre-amplifier status. If a pre-amplifier is connected, a "1" is returned, otherwise, a "0" is returned. The H command is a read only command.

I {n}

If n is included, the I command sets the remote- local status. If n is absent, the remote-local status is returned.

n Status

0Local: all front panel keys are operative

1Remote: front panel keys are not operative. The LOCAL key returns the status to local.

2Lock-out: front panel keys are not operative. No key returns the status to local. Another I command is needed to return to local.

When using the GPIB interface, the REN, LLO, and GTL commands are not implemented. The I command is used by both interfaces to set the remote-local status.

J {n1,n2,n3,n4}

The J command sets the RS232 end-of-recordcharacters sent by the SR530 to those specified by the decimal ASCII codes n1-n4. If no argument is included, the end-of-record sequence returns to the default (a carriage return), otherwise, up to four characters may be specified. The end-of- record required by the SR530 when receiving commands is not affected.

K n

The K command simulates a front panel key press. The effect is exactly the same as pressing the selected key once. The parameter n is required.

n Key

1Post Time Constant Up

2Post Time Constant Down

3Pre Time Constant Up

4Pre Time Constant Down

5Select Display (f/phase)

690° Up

790° Down

8Zero Phase (Simultaneous 90° Up and Down)

9Reference Trigger Mode

10Reference Mode (f/2f)

11Degrees Up

12Degrees Down

13Channel 2 Rel

14Channel 2 Offset (On/Off)

15Channel 2 Offset Up

16Channel 2 Offset Down

17Channel 2 Expand

18Output Display Up

19Output Display Down

20Channel 1 Expand

21Channel 1 Rel

22Channel 1 Offset (On/Off)

23Channel 1 Offset Up

24Channel 1 Offset Down

25Dyn Res Up

26Dyn Res Down

27Sensitivity Up

28Sensitivity Down

29Local

30Line X 2 Notch Filter

31Line Notch Filter

32Bandpass Filter

L m {,n}

The L command sets and reads the status of the line notch filters. If m is "1", then the 1X line notch is selected, if m is "2", the 2X line notch is selected. The parameter m is required. If n is "1", the L command sets the selected filter in. If n is "0", the selected filter is taken out. If n is absent, the status of the selected filter is returned.

M {n}

If n is "1", the M command sets the reference mode to 2f. If n is "0", the reference mode is set to f. If n is absent, the reference mode is returned.

N {m}

If m is "1", the N command sets the ENBW to 10 Hz. If m is "0", the ENBW is set to 1 Hz. If m is absent, the ENBW setting is returned.

OX {n} {,v}

OY {n} {,v}

OR {n} {,v}

The "OX", "OY", and "OR" commands set the offsets for the X, Y, and R outputs respectively. If n is "1", the offset is turned on. If n is "0", the offset is turned off. If n and v are absent, the offset status (on or off) is returned. (The value of the offset is read using the S and Q commands.)

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SRS Labs Lock-In Amplifier, SR530 manual N1,n2,n3,n4

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.