Performance Tests

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:

Set the AC Calibrator to:

Function

Sine

Frequency

1 kHz

Frequency

1 kHz

Amplitude

1.0000 Vrms

Amplitude

0.5 Vrms

Voltage

Off

Offset

off or 0V

Phase Lock

On

Sweep

off

Sense

Internal

Modulation

none

 

 

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>

Use the knob to select External. <Ref. Slope>

Select Rising edge.

[DISPLAY/SCALE] <Type and Trace>

Highlight the trace number.

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

[GAIN/TC] <Filter db/oct>

Select 24 dB/oct.

[OUTPUT/OFFSET]

<X, Y or R>

Select R offset and expand.

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SRS Labs SR850 manual Amplitude Linearity, Output/Offset

SR850 specifications

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