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Figure 2. Calibrator A1 circuit board - component location.

Calibration Procedure For Calibrator Model 8477A Page Navigation
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TB 9-6625-1956-24
(8) Turn TI POWER (mW) switch to 10. The multimeter will indicate between
3.097 and 3.103 V dc.
(9) Turn TI POWER (mW) switch to .01.
(10) Set the power meter MOUNT RESISTANCE switch to 100 .
(11) Turn TI FUNCTION switch to 100 . The multimeter will indicate between
2.197 and 2.203 V dc.
(12) Turn TI POWER (mW) switch to .03, .1, .3, 1, 2, and 3. In each position, the
multimeter will indicate between 2.197 and 2.203 V dc.
b. Adjustments. No adjustments can be made.
10. Final Procedure
a. Deenergize and disconnect all equipment and replace TI protective cover.
CAUTION
o
Return power meter MOUNT RESISTANCE switch to 200
r damage may result to meter if accidentally operated in the
100  position with a 200  thermistor mount.
b. Return power meter OPERATE/CALIBRATE switch A2S1 to OPERATE and
replace protective cover.
c. Annotate and affix DA label/form in accordance with TB 750-25.
8


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