Sine Output Amplitude Accuracy and Flatness

Performance Tests

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 [←] key pressed)

2)Press the keys in the following sequence:

[DISPLAY/SCALE] <Type and Trace>

Highlight the trace number.

Use the knob to select trace 3 (R) for the top display.

3)Amplitude accuracy is verified at 1 kHz using various sensitivities. For each sine amplitude and sensi- tivity setting in the table below, perform steps 3a through 3b.

Sensitivity	Sine Output Amplitude
1 V	1.000 Vrms
200 mV	0.200 Vrms
50 mV	0.050 Vrms
10 mV	0.010 Vrms

a)Press [REF/PHASE]

Enter the sine amplitude from the table.

[GAIN/TC]

Use the knob to select the sensitivity from 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

24kHz

48kHz

72kHz

96kHz

7-19

SR850 specifications

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SRS Labs SR850 manual Sine Output Amplitude Accuracy and Flatness, Gain/Tc

Models: SR850