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b) Set <Sensitivity>.
c) Wait 10 seconds, then record <R>, then test next group of Sensitivity-Sine Output.
4. Repeat from 3)-a) to 3)-c) until all the Sensitivity-Sine Output are tested over. Frequency response is checked at
frequencies above 1 kHz. Set <Ref. Frequency> in the following sequence:
Test Frequencies
24 kHz
48 kHz
72 kHz
96 kHz
a) Set <Sensitivity> to <1 V>.
b) Set the amplitude of the SINE OUT to <1Vrms>.
c) Set <Ref. Frequency> in the upper sequence.
d) Wait 10 seconds, then record <R>, then test next frequency.
e) Repeat from 4)-c) to 4)-d) until all the frequencies are tested over.
5. End the test and fill results in the performance test form.
6.8 DC Outputs and Inputs
This test measures the DC accuracy of the DC outputs and inputs of the lock-in.
Device
Use a linear DC regulator to generate a DC input.
Use a DVM to measure the DC output of the lock-in.
Connect a 50
Ω
BNC termination to the A/I input of the lock-in.
Steps
1. Turn the lock-in off and on to restart it.
2. Set <Ref.Source> to <Internal>.
3. Follow the steps below:
a) Use a cable to connect CH1 or CH2 of the lock-in to the DVM. Set the DVM to 19.999 V range.
b) Set <Offset> of <Channel Output> in the following sequence:
Offset (%)
100.00
50.00
0.00
