TM 9-4910-700-14 & P
MAINTENANCE
4-1. GENERAL. This chapter covers all
4-2. PERFORMANCE VERIFICATION. The
phases of maintenance of the test set.
performance verification test is used
Performance verification will deter-
to determine if a given test set is
mine if a given test set is performing
operating within specifications. Slight
within specifications. The cleaning
variations from the tolerances given
and lubrication section provides
indicate probable need for recalibration,
Gross variations indicate the need for
instructions for cleaning the test set.
No lubrication is required. The adjust-
troubleshooting and repair.
ments instructions are for calibrating
the test set to remove minor drifts
a.
Required Test Equipment. Table
due to aging or replacements of compon-
test equipment required for
ents. The repair section contains
instructions for parts and component
replacements.
NAME
Mfr./MODEL
NSN
Hewlett-Packard
4931-00-490-0776
214A
Electronic Counter
Hewlett-Packard
52-45L
Power Supply
General Purpose
20 Volts
b.
Accessory Equipment Required.
NAME
DESCRIPTION
Cable, Test
BNC-type connectors on one end and
alligator clips for connecting test
equipment to unit under test.(2 req.)
c.
Dwell Meter Test,
1. Set up equipment as in figure
to an engine RPM of 1500 and a dwell
4-1. Set to
test set on 8
of 22.5. The meter under best should
lobe position.
read between 20.7 and 24.3 .
2.
4.
Switch the unit under test to the
20 volt pulse at 200Hz rep-
4 lobe position. The meter should
etition rate and 2.5 milli-
now read between 42.3 and 47.7.
second width.
5.
Switch the unit under test to the
Adjust repetition rate to
6 lobe position. The meter under
3.
exactly 200Hz and 2.5 milli-
test should read between 28.2 and
second width using electronic
31.8.
counter. This corresponds