Amplitude Linearity - Stanford Research Systems SR850 User Manual

5. Amplitude Linearity

This test measures the amplitude linearity. This tests how accurately the lock-in measures a signal smaller
than full scale.
Setup
We will use the frequency synthesizer to provide an accurate frequency and the AC calibrator to provide a
sine wave with an exact amplitude.
Connect the output of the frequency synthesizer to the phase lock input of the calibrator. Connect the output
of the AC calibrator to the A input of the lock-in. Be sure to use the appropriate terminations where required.
Connect the TTL SYNC output of the synthesizer to the Reference Input of the lock-in.
Set the Synthesizer to:
Function
Frequency
Amplitude
Offset
Sweep
Modulation
Procedure
1) {PRESET} (Turn the lock-in off and on with the [ ] key pressed)
2) Press the keys in the following sequence:
[REF/PHASE]
<Ref. Source>
<Ref. Slope>
[DISPLAY/SCALE]
<Type and Trace>
[GAIN/TC]
<Filter db/oct>
[OUTPUT/OFFSET]
<X, Y or R>
Sine
1 kHz
0.5 Vrms
off or 0V
off
none
Use the knob to select External.
Select Rising edge.
Highlight the trace number.
Use the knob to select trace 3 (R) for the top display.
Select 24 dB/oct.
Select R offset and expand.
Performance Tests
Set the AC Calibrator to:
Frequency 1 kHz
Amplitude 1.0000 Vrms
Voltage Off
Phase Lock On
Sense Internal
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