SRS Labs Lock-In Amplifier, SR530 manual J n1,n2,n3,n4, L m ,n, OX n ,v OY n ,v OR n ,v

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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