TM 11-6625-2398-14-4
CHAPTER 8
GENERAL SUPPORT TESTING PROCEDURES
other conductor in the cable (one conductor at a time).
8-1. General
c. If the meter indicates zero short exists between
a. Testing procedures are prepared for use by
the two conductors being measured.
signal field maintenance shops and signal service
d. If the meter indicates less than infinite but more
organizations
responsible
for
general
support
than zero, the two conductors have a dc leakage path
maintenance of signal equipment to determine the
between them.
acceptability of repaired equipment. These procedures
e. If the meter indicates infinite, the two conductors
set forth specific requirements that repaired equipment
are not shorted.
must meet before it is returned to the using organization.
8-5. Cable Continuity Check
These procedures may also be used as a guide for
testing equipment that has been repaired.
When checking for continuity, the ohmmeter leads may
not be long enough to be connected to both ends of the
b. Comply with the instructions preceding each
cable.
The following procedures are given as a
chart before procedures contained in the chart.
convenient method of determining the condition of a
Perform each step in sequence. Do
not
vary
the
cable.
sequence. For each step, perform all the actions
a. Connect a resistor of known value, 50,000 ohms
required in the test equipment control settings and
or more, between one end of the suspected cable
equipment under test control settings columns; then
conductor and ground.
perform each specific test procedure and verify it against
b. Connect the ohmmeter leads between the
its performance standard.
conductor and ground at the other end of the cable.
8-2. Test Equipment and Materials
c. If the meter indicates approximately 50,000
Multimeter TS-352B/U and those equipment's listed in
ohms, the conductor has continuity.
TB 11-6625-2398-35 are required to perform the testing
d. If the meter indicates infinite resistance, the
procedures in this chapter.
conductor is open.
8-3. Modification Work Order
e. If the meter indicates zero resistance, the
The performance standards listed in the tests (para 8-4,
conductor is shorted to ground.
8-5 and 8-6) are based on having no modification work
f. If the meter indicates much less than 50,000
orders performed on the test facilities set.
ohms, but not necessarily zero, the conductor has a dc
8-4. Cable Short Circuit
leakage path to ground.
Check To check a multiconductor cable for shorts
8-6. Hybrid Attenuator lAlAl, Performance Standards
between conductors, proceed as follows:
Performance standards for the hybrid attenuator are
a. Connect one ohmmeter lead to each cable
achieved when the hybrid attenuator can comply with its
conductor, one at a time, while performing the following
calibration standards.
Hybrid attenuator calibration
steps for each connection.
standards are contained in TB 11-6625-2398-35.
b. Connect the second ohmmeter lead to every
8-1
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