SECTION III PRELIMINARY PROCESS

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

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)

identification number as listed in tables 2 and 3. For the

power cord. The mains plug shall

identification of equipment referenced by item numbers

only be inserted in a socket outlet

prefixed with A, see table 2, and for prefix B, see table 3.

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

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.

(a) SIGNAL FREQUENCY control to 15

(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)