tip, the other on ring. Moving away
from the C.O., the fault is located at
the point the CLICK disappears.
3. Continuity of each side of the
loop may be verified by placing one of
the test leads on a local ground and
the other on the conductor in ques-
tion. On a good
RING conductor, a
CLICK will be heard; on a good TIP
conductor, an inductive HUM will be
heard (due to the difference in ground
potential between the C.O. ground
and the local ground).
For a full discussion on these
troubleshooting procedures, you are
referred to your company's practices
or to "Lee's ABC of the Telephone",
Vol. 2, Chapters 13, 14, and 15.
CAUTION: When testing circuits
which are relatively close to the bat-
tery source, the CLICKS in the receiver
may be loud enough to cause acous-
tical shock if the receiver is held
tightly against the ear. The TS21 is
designed to rest comfortably on the
shoulder with the receiver away from
the ear. It should be used in this posi-
tion when listening for CLICKS.
TCI Library: www.telephonecollectors.info
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