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4. End the test and fill the results in the performance test form.
6.6 Frequency Accuracy
This test measures the frequency accuracy of the lock-in.
Device
Use the function signal generator to provide the reference signal.
Use one cable with BNC connector to connect the reference signal of the function signal generator to the REF IN of
the lock-in.
Steps
1. Turn the lock-in off and on to restart it.
2. Set the frequency of the function signal generator to 10 kHz.
3. Wait until <PLL: UNLOCK> changes to <PLL: LOCKED>, then record <Freq>.
4. End the test and fill in the performance test form.
6.7 Sine Output Amplitude Accuracy and Flatness
This test measures the amplitude accuracy and frequency response of the internal oscillator SINE OUT.
Device
Use a 1 meter length cable with BNC connector to connect the SINE OUT to the A/I of the lock-in.
Steps
1. Turn the lock-in off and on to restart it.
2. Set <Sensitivity> to <1 V> and <Ref. Source> to <Internal>.
3. The frequency of the internal oscillator should be 1kHz steadily. Set <Sensitivity> and the amplitude of the
SINE OUT in the following sequence:
Sensitivity
Sine Output
1 V
0.800 Vrms
500 mV
0.400 Vrms
200 mV
0.160 Vrms
a) Set the amplitude of <SINE OUT>.
b) Set <Sensitivity>.
c) Wait 10 seconds, then record <R>, then test next group of Sensitivity-Sine Output.
