Stanford Research Systems SR844 User Manual page 27

Use the knob to adjust the offset until the
15
CH1 display is 0.0 V.
16 Press CH1 Offset On/Off again.
17 Press Display four times to return to X
display.
18 Press Expand twice to turn Expand off.
Press CH1 Offset On/Off once.
19
Outputs, Offsets and Expands 1-17
The offset should be about -10%. (R was 0.1 V or
10% of full scale).
Pressing Expand will increase the resolution of the
R measurement. The R offset and expand do not
affect either X or Y. Note that the DVM still reads
10 V for the X output.
This turns off the R offset. The CH1 ROffs
indicator turns off and the displayed R returns to
0.1 V. The XYOffs indicator remains on because
XY offsets are still on.
The CH1 display returns to showing X with Xoffset
and Expand on.
Turn off X expand. The Expand key cycles through
none, x10 and x100.
Turn off X offset. This also turns off Y offset. The
XYOffs indicators turn off and the displays show
the original measurement of the REF OUT signal.
This completes this exercise. For more information
see Chapter 3, CH1 Display and Output.
SR844 RF Lock-In Amplifier