Amplitude Accuracy And Flatness - Stanford Research Systems SR830 Manual

4. Amplitude Accuracy and Flatness

This test measures the amplitude accuracy and frequency response.
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 [Setup] key pressed)
2) Press the keys in the following sequence:
[Source]
Select External reference mode (INTERNAL led off).
[Trig]
Select POS EDGE.
[Channel 1 Display]
Set the Channel 1 display to R.
[Slope/Oct]
Select 24 dB/oct.
3) Amplitude accuracy is verified at 1 kHz and various sensitivities. For each sensitivity setting in the
table below, perform steps 3a through 3c.
Sensitivity
200 mV
100 mV
20 mV
10 mV
a) Set the AC calibrator to the amplitude shown in the table.
Sine
1 kHz
0.5 Vrms
off or 0V
off
none
AC Calibrator Amplitude
1 V 1.0000 Vrms
200.00 mVrms
100.000 mVrms
20.000 mVrms
10.000 mVrms
Performance Tests
Set the AC Calibrator to:
Frequency 1 kHz
Amplitude 1.000 Vrms
Voltage Off
Phase Lock On
Sense Internal
6-9