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99
6.9 Input Noise
This test measures the input noise of the lock-in.
Device
Connect a 50
Ω
BNC termination to the A/I input of the lock-in. This grounds the input so the lock-in
’
s own noise
is measured.
Steps
1. Turn the lock-in off and on to restart it.
2. Set the parameters in the following sequence:
<Ref. Source>
Set to <Internal>
<Ref. Frequency>
Set to 997 Hz
<Sensitivity>
Set to <100 nV> through the spinning knob
<Reserve>
Set to <Low>
<Filter>
Set to <24 dB/oct>
<Trace>
Set <Trace> in <Display> to <Noise>.
3. Wait until the reading is steady, and then record the maximum value of noise.
4. End the test and fill the result in the performance test form.
6.10
SE2031 Performance Test Record
SE2031 Performance Test Record
Serial Number
Tested By
_
Firmware Revision
Date
_
Equipment Used
_
_
1. Starting Tests
Pass
Fail
2. DC Offset
Input Coupling
Reading
Upper Limit
AC
0.500mV
DC
0.500mV