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b) Set the frequency of the function signal generator to 1 kHz and the amplitude to 200.00mVrms.
c) Set the frequency of the function signal generator in the upper sequence.
d) Wait 10 seconds, then record <R>, then test the next frequency.
e) Repeat from 4)-c) to 4)-d) until all the frequencies are tested over.
5. End the test and fill the results in the performance test form.
6.5 Amplitude Linearity
This test measures the amplitude linearity. It tests how accurately the lock-in measures a signal smaller than full
scale.
Device
Use a function signal generator to provide an accurate frequency and a sine wave.
Use a cable with BNC connector to connect the output of the function signal generator to the A/I input of the
lock-in. Use another cable with BNC connector to connect the reference output of the function signal generator to
the REF IN of the lock-in.
Set the function signal generator to:
Function
Sine
Frequency
1 kHz
Amplitude
1 Vrms
Offset
0 V
Output
High Z
Sweep
off
Modulation none
Steps
1. Turn the lock-in off and on to restart it.
2. Set <Filter> to <24 dB/oct> and <Sensitivity> to <1 V>.
3. The Amplitude of the function signal generator should be 1kHz at various amplitudes. Set the amplitude in the
following sequence:
Amplitude
1.0000 Vrms
100.00 mVrms
10.000 mVrms
a) Set the output amplitude of the function signal generator.
b) Wait 10 seconds, then record <R>, then test next amplitude.
c) Repeat from 3)-a) to 3)-b) until all amplitudes are tested over.
