TB 9-6625-1014-24
Table 2. Minimum Specifications of Equipment Required - Continued
Manufacturer and model
Common name
Minimum use specifications
(part number)
Range: 0 to 20 V ac
Fluke, Model 8840A/AF05
Frequency: 1kHz
(AN/GSM-64D)
Accuracy: 3%
Range:
Dc detector
ESI, Model 801 (7912151-2)
MEASUREMENT
0 to 10 V
w/ESI, Model 230B (7912150-2)
12
SYSTEM
Bridge:
0 to 1.2 MΩ
Accuracy: 0.025%
Biddle-Gray, Model 71-631
Range:
0 to 1.2 MΩ
STANDARD
(7910328)
Accuracy; 0.03%
1Dc
detector sensitivity 5V.
2Limited deployed.
CALIBRATION PROCESS FOR AN/URM-90 (ZM-30/U)
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Remove protective covers from TI.
b. Connect TI to autotransformer.
c. Connect autotransformer to a 115 V ac source and adjust for a 115 V output.
d. Loosen locking screw one full turn (located on right hand side of TI galvanometer
zero - adjustment knob).
