Stanford Research Systems SR865A, Operation Manual

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182 Performance Tests Appendix G
SR865A DSP Lock-in Amplifier
[Key] Front panel keys are referred to in [square] brackets. Some keys have a
second italicized label. Press and hold these keys for 2 seconds to invoke
the italicized function.
<Knob> Knobs are referred to in <angle> brackets. Knobs are used to adjust
parameters which have a wide range of values. Some knobs have a push
button function. Some also have a second italicized label. Press and hold
these knobs for 2 seconds to invoke the italicized function.
{Touch} Touchscreen buttons and icons are referred to in {curly} brackets.
Touchscreen buttons are used to adjust the data display as well as change
certain lock-in parameters.
Warm Up
The lock-in should be turned on and allowed to warm up for at least an hour before any
tests are performed. It is necessary to turn the unit off and on to preset it. As long as the
unit is powered on immediately, this will not affect the test results.
Necessary Equipment
The following equipment is necessary to complete the performance tests. The suggested
equipment or its equivalent should be used.
1.
Frequency Synthesizer
Freq Range 1 Hz to 4 MHz
Freq Accuracy better than 5 ppm
Harmonic Distortion
≤ −
65 dBc
Spurious ≤ − 55 dBc
TTL SYNC available
2.
AC Voltmeter
Freq Range 10 Hz to 4 MHz
Input Ranges 10 mV, 100 mV, 1 V
Accuracy 0.5% below 200 kHz, 2% below 2 MHz
Suggested instrument Keysight model 3458A
3.
DC Voltmeter
Range 19.999 V, 4 1/2 digits
Accuracy 0.005%
4.
Feedthrough Terminations
Impedance 50 Ω , precision to ± 0.1%
Test Record
Make a copy of the SR865A Performance Test Record at the end of this section. Fill in
the results of the tests on this record. This record will allow you to determine whether the
tests pass or fail and also to preserve a record of the tests.