Gain And Time Constant - Stanford Research Systems SR810 Manual

Remote Programming
GAIN and TIME CONSTANT COMMANDS
SENS (?) {i}
RMOD (?) {i}
OFLT (?) {i}
OFSL (?) {i}
The SENS command sets or queries the sensitivity. The parameter i
selects a sensitivity below.
i sensitivity
0 2 nV/fA
1 5 nV/fA
2 10 nV/fA
3 20 nV/fA
4 50 nV/fA
5 100 nV/fA
6 200 nV/fA
7 500 nV/fA
8 1 µV/pA
9 2 µV/pA
10 5 µV/pA
11 10 µV/pA
12 20 µV/pA
The RMOD command sets or queries the reserve mode. The parameter i
selects High Reserve (i=0), Normal (i=1) or Low Noise (minimum) (i=2).
See the description of the [Reserve] key for the actual reserves for each
sensitivity.
The OFLT command sets or queries the time constant. The parameter i
selects a time constant below.
i time constant
0 10 µs
1 30 µs
2 100 µs
3 300 µs
4 1 ms
5 3 ms
6 10 ms
7 30 ms
8 100 ms
9 300 ms
Time constants greater
harmonic x ref. frequency (detection frequency) exceeds 200 Hz. Time
constants shorter than the minimum time constant (based upon the filter
slope and dynamic reserve) will set the time constant to the minimum
allowed time constant. See the Gain and TIme Constant operation
section.
The OFSL command sets or queries the low pass filter slope. The
parameter i selects 6 dB/oct (i=0), 12 dB/oct (i=1), 18 dB/oct (i=2) or
24 dB/oct (i=3).
5-6
i sensitivity
13 50 µV/pA
14 100 µV/pA
15 200 µV/pA
16 500 µV/pA
17 1 mV/nA
18 2 mV/nA
19 5 mV/nA
20 10 mV/nA
21 20 mV/nA
22 50 mV/nA
23 100 mV/nA
24 200 mV/nA
25 500 mV/nA
26 1 V/µA
i time constant
10 1 s
11 3 s
12 10 s
13 30 s
14 100 s
15 300 s
16 1 ks
17 3 ks
18 10 ks
19 30 ks
than 30s may NOT be set if the