TB 11-6625-2747-50
SECTION III
PRELIMINARY PROCESS
the correct fuse is installed, and
6. Preliminary Instructions. a. The instructions
Safety Precautions are taken.
outlined in paragraphs 6 and 7 are preparatory to the
WARNING
calibration process. Personnel should become familiar
BEFORE
SWITCHING
ON
THE
with the entire bulletin before beginning the calibration.
INSTRUMENT, the protective earth
b. Items of equipment used in this procedure are
terminal must be connected to the
referenced within the text by common name and item
protective conductor of the (mains)
power cord. The mains plug shall
identification of equipment referenced by item numbers
only be inserted in a socket outlet
provided with a protective earth
WARNING
contact. The protective action must
HIGH VOLTAGE is used during the
not be negated by the use of an
performance of this calibration.
extension cord (power cable) without
DEATH ON CONTACT may result if
a protective conductor (grounding).
personnel fail to observe safety
Grounding one conductor of a two
precautions.
conductor outlet is not sufficient
NOTE
protection.
Unless otherwise specified, verify the
IF THIS INSTRUMENT is to be
results of each test and, whenever
energized via an autotransformer,
the test requirement is not met, take
make sure the common terminal is
corrective action before continuing
connected to the earth terminal of the
with the calibration.
Additional
power source.
maintenance
information
is
CAPACITORS
INSIDE
THE
contained in the manufacturer's
INSTRUMENT may still be charged
manual.
even if the instrument has been
NOTE
disconnected from its source of
Unless otherwise specified, all
supply.
controls and control settings refer to
a. Turn TI PWR SET and OUTPUT ATTEN DBM
the TI.
7. Equipment Setup.
controls fully counterclockwise.
b. Energize TI and allow approximately 20 minutes
NOTE
BEFORE APPLYING POWER verify
for warmup and stabilization. Do not connect the TI to
that the power transformer primary is
the calibration equipment at this time.
matched to the available line voltage,
SECTION IV
CALIBRATION PROCESS
8. Zero Set. a. Performance Check.
9. Power Monitor. a. Performance Check.
(1) Turn TI MOD SELECTOR switch to OFF.
(1) Connect TI RF OUTPUT connector to power
(2) Adjust TI ZERO SET control for ZERO SET
meter (A3) using waveguide thermister mount P486A
as indicated on TI power monitor meter.
and adaptor (B18)
b. Adjustments.
(2) Position TI controls as indicated in (a)
through (g) below.
(1) Remove TI from case.
(2) Turn ZERO SET control to midrange.
(3) Adjust R98 (figure 1) for ZERO SET as
GHz as indicated on TI frequency dial.
(b) MOD SELECTOR switch to OFF.
indicated on power monitor meter. (R)
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