TB 9-6625-177-24
Table 2. Minimum Specifications of Equipment Required Continued.
Manufacturer and model
Common name
Minimum use specifications
(part number)
Frequency range: 200 kHz to 2000 MHz
RF POWER METER
Bird, Model 4421 (4421) w/
Power range: 7.5 to 100 W
Directional power sensors,
Accuracy: (3%)
model 4021, 4022 and 4025
(4021, 4022, 4023A2G, and
4025)
Frequency range: 200 kHz to 2000 MHz
Aeroflex, Model 2023B
SIGNAL GENERATOR
Power output range: 100 mW
(2023B)
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. Set power switches of audio analyzer, RF power amplifier, RF power meter, signal
generator, and multimeter to ON position and allow equipment 30 minutes to warm-up.
b. Set TI range switch to the OFF position and mechanically zero TI meter in vertical
position.
c. Insert calibration element into TI and rotate in any direction until it stops.
d. Connect multimeter (ohms mode) between center conductor and outer shield of TI
50 Ω termination (part of TI). Multimeter will indicate between 48 Ω and 52 Ω.
e. Set TI range switch to 100 and allow TI to warm-up for 5 minutes.
