Stanford Research Systems SR830, Manual

Page: 115 / 177

5-32
Remote Programming
H The SR830 does not sense the pre-amplifier. This command is emulat-
ed and always returns 0.
I {n} Change the remote/local status. The SR830 Override Remote mode
can override the I2 command. Use the OVRM command to change
this.
J Not implemented. Do not use.
K Not implemented. Do not use.
L m {,n} Change the line notch filter status.
M {n} Change the reference mode to 2f. This command actually sets the
harmonic detect number to n+1 in order to access harmonics
higher than 2f.
N {m} Change the noise bandwidth. This command has no effect on the time
constants. If the S4 command is used to change the display to
Xnoise,Ynoise, then the N m command changes the effective ENBW
with which the output noise will be reported when queried using the
Q1 or Q2 commands. The N command only affects the response to
Q1 or Q2 and only if the S4 command is used first.
OX {n} {,v}
OY {n} {,v}
OR {n} {,v}
Change the X, Y or R offsets. Remember, v is an input voltage (not a
percentage) for the SR530. Unlike the SR530, the X and Y offsets
have no effect on R.
P {v} Change the reference phase shift. The value of v is limited to
-360.0
≤
v
≤
729.99. The phase shift is also defined differently for the
SR830. Check the sense of phase rotation if your application is
phase sensitive.
Q1
Q2
QX
QY
Read the output values in Volts or degrees. When the current input is
selected, the outputs are returned in Amps.
R {n} Change the reference input mode.
S {n} Change the Output displays. The SR830 only responds if n=0 (X,Y),
n=2 (R,
θ
) or n=4 (Xnoise,Ynoise).
T m {,n} Change the time constant.
If m=1, then T1,n sets the time constant from 1 ms (n=1) to 30 ks
(n=16). Time constants greater than 30 s are available only if the
detection frequency is below 200 Hz. The time constant slope is not
changed. The T1 query returns a maximum value of 11, even if the
time constant is greater than 100 s.