TB 9-6625-2216-24
standard and TI. Where the four-to-one ratio cannot be met, the actual accuracy of the
equipment is shown in parenthesis.
5. Accessories Required. The accessories required for this calibration are common
usage accessories issued as indicated in paragraph 4 above, and are not listed in this
calibration procedure.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
AUTOTRANSFORMER
Range: 105 to 125 V ac
Ridge, Model 9020A (9020A)
Accuracy: 1%
Resolution: 1 part in 1010
FREQUENCY DIFFERENCE METER
Tracor, Model 527E (527E)
FUNCTION/ARBITRARY
Range: 10 Hz to 10 MHz
Agilent, Model 33250A (33250A)
Amplitude: 0 to 100 mV
SIGNAL GENERATOR
Range: 10 to 500 MHz
(SG-1207/U)
Amplitude: 0 to 100 mV
TIME/FREQUENCY WORKSTATION
Range: 1 MHz
Datum, Model ET6000-75
Accuracy: 1 part in 1010
(13589305)
CALIBRATION PROCESS
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
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 cover from TI only when necessary to make adjustments. Replace
cover after completing the adjustments.
b. Connect TI to autotransformer.