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Power Reference Level
Table 3. Basic Instrument Accuracy

Calibration Procedure For Radio Frequency Power Test Set, An/Usm-491 (Model 4200 Rf Microwattmeter And Series 4200-6E Sensor) Page Navigation
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TB 9-6625-2185-24
(13) If calculated PO is not between 0.993 and 1.007 mW, perform b below.
b. Adjustments
(1) Remove two screws (A) and remove front panel strip (fig. 1).
Figure 1. Adjustment locations - bottom view.
(2) Adjust AR4 (fig. 1) so that calculated PWR REF output power is
1 mW as calculated in (7) through (12) above. (R)
CHANGE 1 7


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