Stanford Research Systems SR865A Operation Manual page 212

194 Performance Tests
dc Outputs and Inputs
This test measures the dc accuracy of the dc outputs and inputs of the lock-in.
Setup
We will use the digital voltmeter (DVM) to measure the dc outputs of the lock-in. Then we will use one
of the outputs to generate a voltage to measure on the dc inputs.
Connect a 50Ω termination to the A input.
Procedure
1) {PRESET} (press [Save Recall], then touch {Recall default}. Touch {Confirm})
Press [Screen Layout] multiple times if needed
Set the screen to show 8 big numerical/bar graphs.
2) For the CH1 and CH2 outputs, repeat steps 2a through 2e.
a) Connect the CH1 (or CH2) output to the DVM. Set the DVM to a 20 V range.
b) Use the front panel to make the following adjustments
Press the CH1 (or CH2) Output <Offset> knob
Turn the offset on. Make sure the
Press and hold the CH1 (or CH2) Output <Offset> knob
Display the X (or Y) offset keypad.
c) For each of the offsets in the table below, repeat steps 2d and 2e.
Offsets (%)
−100.00
−50.00
0.00
50.00
100.00
d) Use the front panel to make the following adjustments
Turn the CH1 (or CH2) Output <Offset> knob to set the offset to the value in the table.
e) Record the DVM reading.
3) For each Aux Output (1, 2, 3 and 4), repeat steps 3a through 3e.
a) Connect the Aux Output (on the rear panel) to the DVM.
b) Use the front panel to make the following adjustments
SR865A DSP Lock-in Amplifier
OFFSET LED is on.
Appendix G