Stanford Research Systems SR810 Manual page 21

rear panel.
7. Connect the DVM to the CH1 OUTPUT on
the front panel again.
Press [Channel 1 Output] to select Display.
Press [Channel 1 Display] to select R.
Outputs, Offsets and Expands
voltages proportional to X and Y (with offset and
expand). The X output voltage should be 10 V, just like
the CH1 output.
The front panel outputs can be configured to output
different quantities while the rear panel outputs always
output X and Y.
NOTE:
Outputs proportional to X and Y (rear panel or CH1)
have 100 kHz of bandwidth. The CH1 output, when
configured to be proportional to the displays (even if
the display is X) is updated at 512 Hz and has a 200
Hz bandwidth. It is important to keep this in mind if you
use very short time constants.
CH1 OUTPUT can be proportional to X or the display.
Choose Display. The display is X so the CH1 output
should remain 10.0 V (but its bandwidth is only 200 Hz
instead of 100 kHz).
Let's change CH1 to output R.
The X and Y offset and expand functions are output
functions, they do NOT affect the calculation of R or q.
Thus, Channel 1 (R) should be 0.5V and the CH1
output voltage should be 5V (½ of full scale).
The Channel 1 offset and expand keys now set the R
offset and expand. The X offset and expand are still set
at 40 % and x10 as reflected at the rear panel X output.
See the DC Outputs and Scaling discussion in the
Lock-In Basics section for more detailed information on
output scaling.
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