Sine Output Amplitude - Stanford Research Systems SR810 Manual

8. Sine Output Amplitude Accuracy and Flatness
This test measures the amplitude accuracy and frequency response of the internal oscillator Sine Out.
Setup
We will use the lock-in to measure the Sine Out. Connect the Sine Out to the A input of the lock-in.
Procedure
1) {PRESET} (Turn the lock-in off and on with the [Setup] key pressed)
2) Press the keys in the following sequence:
[Channel 1 Display]
Set the Channel 1 display to R.
3) Amplitude accuracy is verified at 1 kHz using various sensitivities. For each sine amplitude and
sensitivity setting in the table below, perform steps 3a through 3b.
Sensitivity
1 V
200 mV
50 mV
10 mV
a) Press
[Ampl]
Use the knob to set the sine amplitude to the value in the table.
[Sensitivity Up/Dn]
Set the sensitivity to the value in the table.
b) Wait for the R reading to stabilize. Record the value of R.
c) Repeat 3a and 3b for each amplitude in the table.
4) Frequency response is checked at frequencies above 1 kHz. The sine amplitude is set to 1 Vrms for
all frequencies. The test frequencies are listed below.
Test Frequencies
24 kHz
48 kHz
72 kHz
96 kHz
c) Press
[Sensitivity Up]
Set the sensitivity to 1 V.
[Ampl]
Use the knob to set the sine amplitude to 1.00 V.
d) Press

Sine Output Amplitude

1.000 Vrms
0.200 Vrms
0.050 Vrms
0.010 Vrms
6-11
Performance Tests