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 50Ω 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.

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SRS Labs SR850 manual DC Outputs and Inputs, Output/Offset

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