SRS Labs Lock-In Amplifier manual SR530 Command List, Ax Ay Ar Ap, E m ,n

SR530 Command List

The leading letters in each command sequence specify the command. The rest of the sequence consists of parameters. Multiple parameters are separated by a comma. Those parameters shown in {} are optional while those without {} are required. The variables m and n represent integers while v represents a real number. Parameters m and n must be expressed in integer format while v may be in integer, real, or floating point format.

AX

AY

AR

AP

The A command causes the auto offset (rel) function to execute. Auto offset is performed by reading the output and using that value as the appropriate offset. Every time an "AX" command is received, the auto offset function is executed on the X output. The "AY" command auto offsets the Y output. The "AR" command auto offsets the R output. Note that "AX" and "AY" will affect the R output but "AR" will not affect X and Y. The "AP" command will execute the auto-phase routine. This is done by setting the reference phase shift with the present phase difference between the signal and the reference input. The ¯ output then reads zero and the reference display reads the signal phase shift. "AP" maximizes X and minimizes Y but R is unaffected. The A commands may be issued at any time, regardless of the DISPLAY setting.

B {n}

If n is "1", the B command sets the bandpass filter in. If n is "0", the bandpass filter is taken out. If n is absent, then the bandpass filter status is returned.

C {n}

If n is "1", the C command sets the reference LCD display to show the phase setting. If n is "0", the LCD will display the reference frequency. If n is absent, the parameter being displayed (frequency or phase) is returned. Note that the P and F commands are used to read the actual values of the phase and frequency.

D {n}

If n is included, the D command sets the dynamic reserve. If n is absent, the dynamic reserve setting is returned.

nDyn Res

0 LOW

1 NORM

2 HIGH

Note that not all dynamic reserve settings are allowed at every sensitivity.

E m {,n}

The E command sets and reads the status of the output expands. If m is "1", then Channel 1 is selected, if m is "2", Channel 2 is selected. The parameter m is required. If n is "1", the E command expands the selected output channel. If n is "0", the expand is turned off for the selected channel. If n is absent, the expand status of the selected channel is returned. Note that the expands do not affect the X and Y BNC outputs, only the Channel 1 and 2 outputs.

F

The F command reads the reference frequency. For example, if the reference frequency is 100 Hz, the F command returns the string "100.0". If the reference frequency is 100.0 kHz, the string "100.0E+3" is returned. The F command is a read only command.

G {n}

If n is included, the G command sets the gain (sensitivity). If n is absent, the gain setting is returned.

nSensitivity

1 10 nV

2 20 nV

3 50 nV

4 100 nV

5 200 nV

6 500 nV

71 ∝ V

82 ∝ V

95 ∝ V

1010 ∝ V

1120 ∝ V

1250 ∝ V

13100 ∝ V

14200 ∝ V

15500 ∝ V

161 mV

172 mV

185 mV

1910 mV

2020 mV

2150 mV

22100 mV

21