TM 11-6625-3053-14
SECTION IV. ELECTRICAL ALINEMENT PROCEDURE
6-15.
GENERAL
This section contains information to enable you to aline the AN/USM-213B so that it will always be emitting an accurate
RF signal of selected frequency and output level.
The alinement procedure is presented in tabular form of the same type as in Section III, Electrical Check Procedures.
There are 10 steps in a complete alinement.
As in the case of the Electrical Checks, the sig gen should be allowed to warm up for 90 mins before per-forming
electrical alinements. If the instrument has been operating immediately before you run the electrical alinement or
alinements, that time counts toward the warmup period.
The entire 10 alinement procedures should be performed every 6 months immediately prior to the running of the electrical
check procedures of Section III.
Alinement steps 1 through 9 should be performed after the replacement of an oscillator assembly or the replacement of a
klystron tube.
Individual alinement steps are to be performed as called for in Section III, Electrical Check Procedures, or after the
replacement of certain parts as indicated in Section Vl.
WARNING
When performing the alinement procedures, you will be working
inside the signal generator in its energized state. You must
exercise extreme care when adjusting electrical elements such
as potentiometers, and when positioning mechanical parts such
as the frequency cam tabs. Observe all safety rules. Refer to
para 1-14a, Safety, Care Handling and Warning pages at the
front of this manual.
When adjusting potentiometers inside the instrument, always
use insulated adjustment rods of sufficient length to avoid direct
bodily contact.
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