TB 9-6625-2184-35
provide a four-to-one ratio between the standard and TI. Where the four-to-one ratio
cannot be met, the actual accuracy of the equipment selected is shown in parenthesis.
usage accessories, issued as indicated in paragraph 4 above, and are not listed in the
calibration procedure. The following peculiar accessory is also required for this calibration:
Voltage Divider, 600 Ω, double banana plug to triple banana jack, Hewlett-Packard, Model
11047A (7911560)
Manufacturer and model
Common name
Minimum use specifications
(part number)
AUDIO ANALYZER
Range: 50 Hz to 100 kHz
Boonton, Model 1121 (1121)
Accuracy: < 1%
AUTOTRANSFORMER
Range: 105 to 125 V ac
Ridge, Model 9020A (9020A)
Accuracy: 1%
FREQUENCY COUNTER
Range: 50 Hz to 500 kHz
Fluke, Model PM6681/656
Accuracy: 0.5%
(PM6681/656)
Range: 230 to 250 V dc
Fluke, Model 8840A/AF05
Accuracy: 1.04%
(AN/GSM-64D)
TRUE RMS VOLTMETER
Range: 6 to 42.5 V ac
Fluke, Model 8922A/AA
Accuracy: 1.25%
(8922A/AA)
6. Preliminary Instructions
process. Personnel should become familiar with the applicable sections 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.
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 8 through 11. Do not perform power supply check if all other
parameters are within tolerance.
e. Unless otherwise specified, all controls and control settings refer to the TI.
