9
Operation
Either the handset receiver or the speaker can be used
to monitor a line. In the Monitor mode, the test set is
typically used to perform one or more of the following
procedures:
•
Verification that a line is idle when looking for a
line to borrow.
•
Listening for noise on the line.
•
Hunting for tracer tones.
•
Testing for dc voltage on the line by using the TEST
key.
Using the Test Set in Talk Mode
In Talk mode, if talk battery is present, the test set will
go off-hook. When off-hook, the test set operates like
a standard telephone; it is typically used to verify the
proper operation of a voice telephone line or to
establish temporary communications on a “borrowed
pair”.
Originating a Call
1
Set the Talk/Monitor switch to M.
2
Clip the test set to Tip and Ring of a subscriber
loop.
3
Monitor (listen to) the line to verify it is idle.
4
If not idle, disconnect the test set from the line.
5
If the line is idle, set the Talk/Monitor switch to T.
6
If talk battery is present, the test set will go off-
hook and draw dial tone.
Note
The test set will not go off-hook if the line
voltage exceeds 140 V.
7
Dial the desired number.
Disconnecting a Call
To disconnect a call, set the Talk/Monitor switch to M or
remove the test leads from the line.
Answering a Call
1
If a ringing signal is received, set the Talk/Monitor
switch to T.
2
If talk battery is present, the test set will go off-
hook and draw dial tone.
Note
The test set will not go off-hook if the line
voltage exceeds 140 Vdc.
Ground Start
Ground start lines are typically found on PBX
installations. To activate an idle ground start telephone
line, do the following:
1
Set the Talk/Monitor switch to M, and connect the
test leads to Tip and Ring of the ground start line.
With a third wire, temporarily short the Tip side of
the line to earth ground. A wire with an alligator
clip at each end is often used for this. Do not allow
clips to short network connections.
2
With the short-to-earth in place, set the Talk/
Monitor switch to T. When dial tone is received,
remove the third wire from earth. The circuit is
now ready for dialing.
