SRS Labs SR850 - Manual (Page 239)

7-21
Performance Tests
9. 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 50
Ω
termination to the A input.
Procedure
1) {PRESET} (Turn the lock-in off and on with the [
←
] key pressed)
2) Press
[OUTPUT/OFFSET]
3) For the CH1 and CH2 outputs, repeat steps 3a through 3e.
a) Connect the CH1 (or CH2) output to the DVM. Set the DVM to 19.999 V range.
b) Press
<Offset & Expand X, Y, or R>
Select X for CH1 and Y for CH2.
c) For each of the offsets in the table below, repeat steps 3d and 3e.
Offsets (%)
-100.00
-50.00
0.00
50.00
100.00
d) Press
<Offset>
Enter the offset from the table.
e) Record the DVM reading.
4) Press
[AUX OUTPUTS]
5) For each output (1, 2, 3 and 4), repeat steps 5a through 5e.
a) Press
<1,2,3,4>
Select the output.
b) Connect the selected Aux Output to the DVM.