TB 9-6625-1866-50
14. Final Procedure
a. Deenergize and disconnect all equipment.
b. In accordance with TM 38-750, annotate and affix DA Label 80 (US Army Calibrated
Instrument). When the TI receives limited or special calibration, annotate and affix DA
Label 163 (US Army Limited or Special Calibration). When the TI cannot be adjusted
within tolerance, annotate and affix DA Form 2417 (US Army Calibration System Rejected
Instrument).
SECTION III
CALIBRATION OF DIFFERENTIAL VOLTMETERS AN/USM-98A AND AN/USM-
98B (J-F 801 B, J-F 801BR, AND J-F 801B/AG)
equipment required for calibration performance checks and adjustments. Table 7 lists
required accessories. Tables 6 and 7 are provided to assist in the selection of required
equipment and accessories. For specific item identification, refer to section IV.
Table 6. Minimum Specifications of Equipment Required
Item
number
Common name
Minimum use specifications
A1
AUTOTRANSFORMER
RANGE: 105 to 125 vac
ACCURACY: 1%
A2
DC VOLTAGE STANDARD
RANGE: 0 to 515 v
ACCURACY: 0.016%
Table 7. Accessories Required
Item
number
Common name
Description
B1
CABLE
30-in., RG-58/U; double banana plug terminations
B2
LEAD
12-in., No. 18; single banana plug terminations (black)
16. Preliminary Procedure
NOTE
Personnel should familiarize themselves with the entire
bulletin prior to performing calibration.
a. Remove protective cover from UUT as necessary to perform adjustments and replace
protective cover to check parameter.
d. Mechanically zero UUT meter.
12
