TB 9-6695-273-35
calibrating activity. The items selected must be verified to perform satisfactorily prior to
use and must bear evidence of current calibration. The equipment must meet or exceed the
minimum use specifications listed in table 2. The accuracies listed in table 2 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.
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. The following peculiar accessories are also required for this
calibration: Power Module, Tektronix, Type TM5006A or equivalent.
Table 2. Minimum Specifications of
Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
ATTENUATOR (FIXED)
Weinschel Model 9918-30dB
Range: 30 dB
(9918-30dB)
Accuracy: Certified before
use within +0.2 dB
FREQUENCY COUNTER
Range: 499.95 to 500.05 MHz Fluke, Model PM6681/656
(PM6681/656)
Accuracy: +0.0025%
POWER METER
Range: 0 to +5 dB
Hewlett-Packard, Model
437B (13440045) w/power
Accuracy: +6%
sensor Hewlett-Packard,
Model 8482A (13440043)
SPECTRUM ANALYZER
Range: 500 MHz to 18 GHz
(AN/USM-489A)
Accuracy: +2.5 dB
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
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.