TB 9-6130-285-24
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
Ridge, Model 9020A (9020A)
AUTOTRANSFORMER
Range: 05 to 125 V ac
Accuracy: 1%
Guildline, Model 9711 (7912323)
DC CURRENT SHUNT
Range: 0 to 20 A dc
Accuracy: 0.1% of setting
Agilent, Model 3458A (3458A)
MULTIMETER #1
Range: 30 mV to 902.25 V dc
Accuracy: 0.01%
Fluke, Model 8846A (8846A)
MULTIMETER #2
Range: 30 mV to 902.25 V dc
Accuracy: 0.01%
Agilent, OS-303/G (OS-303/G)
Range: 20 Hz -20 MHz
Accuracy: 3% of ind
Rohde-Schwarz, Model URE3
TRUE RMS VOLTMETER
Range: 0 to 1 V ac
(URE3)
Accuracy: 3% of ind
CALIBRATION PROCESS USING DECADE RESISTOR
6. Preliminary Instructions
a. The instruction 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. Connect TI to autotransformer. Connect autotransformer to 115 V ac source and set
to minimum.
Shunt range.
c. Determine decade resistance for maximum current at maximum voltage from
ratings in table 1.