Yo Driver Board A6; Frequency Accuracy - HP 83522A Service Notes

Model 83522A
ADJUSTMENTS
Adjustments
5-16. YO DRIVER BOARD A6 DAC CALIBRATION (Cont'd)
21. Adjust A6R11 "G" (gain) for DVM indication of -19.5000 Vdc kO.l mVdc.
22. Repeat steps 4 through 21 to check for the 12.9968 volt difference between steps 12 and
16 with no further adjustment.
5-1 7. FREQUENCY ACCURACY
REFERENCE:
Performance Test: 8350A Paragraph 4-1 3
Service Sheet: A6 and A8
DESCRIPTION:
The frequency accuracy of the marker reference oscillator is first set to 50 MHz using a
frequency counter. The frequency accuracy of the RF plug-in band is then set by selecting
special calibration modes (shift 90 for the low end of band and shift 91 for the high end). In
these calibration modes, the RPG acts as the calibration adjustment and a resulting
frequency error code is displayed on the front panel FREQUENCY display as the RF output
frequency is monitored with a frequency counter. This error code is then entered into the A6
calibration switches (A6S1 for the low end and A6S2 for the high end). After the frequency
accuracy is set, the 50 MHz markers are roughly checked for accuracy at the center of the
band within the range of the the FREQ CAL control.
EQUIPMENT:
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Sweep Oscillator HP 8350A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Voltmeter. HP 3455A
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Frequency Counter. HP 5343A
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10 dB Attenuator
HP 8491A Option 010
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1
:
1 Probe. HP10007B
PROCEDURE:
50 MHz Oscillator Calibration
NOTE
This procedure assumes that A3S1 is set to the factory-set position (Table
5-6).
1. Press 8350A frequency to 2 GHz, and press 83522A
nter to A8TPl through the 1 : 1 probe
(Figures 5-8 -and 5-9) and check that output frequency is 50.000 MHz k250 Hz. If not,
adjust A8C4 50 MHz Oscillator for correct frequency. If necessary, select A8C3 for
correct adjustment range. Refer to Adjustment paragrapgh 5-27.