HP 8642A Operation And Calibration Manual page 279

Model 8642A/B Performance Tests
PERFORMANCE TESTS
4. Distortion
Change the a udio analyzer mode to distortion. Set the
HP
8642
modulation frequency and modulation output level to the values
given in the table below. Verify that the readings are within the
specified limits.
MOD
MOD
Results
FREQ
OUT
Level
Actual Max.
0.020 kHz O.SOV
0.02%
15.80 kHz
O.SOV
- - -
0.02%
100.0 kHz O.SOV 0.15%
0.020 kHz 3.00V
0.02%
15.80 kHz
3.00V 0.02%
100.D kHz 3.DDV 0.15%
5. Output Impedance
Set the HP 8642 MOD FREQ to 1 kHz. Set the audio analyzer to
AC level and ratio. Termmatt: the
HP
8642 MOD OUTPUT with the
600 ohm, F 16 4-7, feedthrough and re-connect the cable. Verify
that the audio analyzer reading is within the specifled limits.
Results
Min. Actual Max.
47.78% 52.77%
NOTE
To compute the actual output impedance
(Z8):
6*(1 OO-Actual%)
=
Zs
4-29