TB 9-6625-2021-35
11
SECTION IV
CALIBRATION PROCESS FOR
MICROWAVE FREQUENCY COUNTER
TD-1225A(V)1/U (HEWLETT-PACKARD, MODEL 5342A/H14),
TD-1225A(V)2/U (HEWLETT-PACKARD, MODEL 5342A/H16), AND
HEWLETT-PACKARD, MODELS 5342A AND 5343A
14. Preliminary Instructions
a. The instructions outlined in paragraphs 14 and 15 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. When indications specified in paragraphs 16 through 19 are not within tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 16 through 19.
e. Unless otherwise specified, all controls and control settings refer to the TI.
15. 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. Remove protective cover from TI only for access to adjustments or test points.
NOTE
When FREQ STD OUT on rear of TI is not being used, the
connector must be terminated with 50Ω feedthrough
termination supplied with TI.
b. Assure that LINE VOLTAGE SELECTOR switch (rear panel) is set for 115 V ac
and verify that correct fuse (as labeled on rear panel) is installed.
c. Connect TI to autotransformer and connect autotransformer to a 115 V ac source
and adjust for 115 V ac output.
d. Position controls as listed in (1) through (7) below.
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