SRS Labs SR850 - Manual (Page 241)

7-23
Performance Tests
10. Input Noise
This test measures the lock-in input noise.
Setup
Connect a 50
Ω
termination to the A input. This grounds the input so the lock-in's own noise is measured.
Procedure
1) {PRESET} (Turn the lock-in off and on with the [
←
] key pressed)
2) Press the keys in the following sequence:
[GAIN/TC]
Use the knob to select 100 nV.
[TRACE/SCAN]
(second soft key)
Highlight X.
Use the knob to select Xn.
3) Wait until the reading of T1 (top display) stabilizes. Record the value of T1.
8) This completes the noise test. Enter the results of this test in the test record at the end of this section.