Necessary Equipment; If A Test Fails; Performance Tests - Stanford Research Systems SR850 User Manual

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
Freq Accuracy
Amplitude Accuracy 0.2 dB from 1 Hz to
Harmonic Distortion
Spurious
TTL SYNC
Recommended
2. AC Calibrator
Freq Range
Amplitude
Accuracy
External phase locking capability
Recommended
3. DC Voltmeter
Range
Accuracy
Recommended
4. Feedthrough Terminations
Impedance
1 Hz to 1 MHz
better than 5 ppm
100 kHz
-65 dBc
-55 dBc
available
SRS DS345
10 Hz to 100 kHz
1 mV to 10 V
0.1%
Fluke 5200A
19.999 V, 4 1/2 digits
0.005%
Fluke 8840A
50

Performance Tests

Warm Up
The lock-in should be turned on and allowed to
warm up for at least an hour before any tests are
performed. The self test does not require any
warm up period.
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.
The Test Record
Make a copy of the SR850 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.

If A Test Fails

If a test fails, you should check the settings and
connections of any external equipment and, if pos-
sible, verify its operation using a DVM, scope or
some other piece of test equipment.
After checking the setup, repeat the test from the
beginning to make sure that the test was per-
formed correctly.
If the test continues to fail, contact Stanford
Research Systems for further instructions. Make
sure that you have the unit's serial number and
firmware revision code handy. Have the test
record on hand as well.
7-3