Stanford Research Systems SR850 User Manual page 184

Remote Programming
OFSL (?) {i}
SYNC (?) {i}
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/TC menu 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).
The SYNC command sets or queries the synchronous filter status. The
parameter i selects Off (i=0) or synchronous filtering below 200 Hz (i=1).
Synchronous filtering is turned on only if the detection frequency (refer-
ence x harmonic number) is less than 200 Hz.
6-8
than 30s may NOT be set if the