4
3
Probe (CON’T)
• One amplifier and one LED for signal detection
• One rotary volume level control
Operation
A. Identifying the polarity of a telephone line
1. Load the 9V battery
2. Slide the toggle switch to the “Off”
position
3. Connect the black test lead to ground
4. Connect the red test lead to the line
you wish to test
5. LED indicator results:
a. GREEN light: indicates normal polarity
b. RED light: indicates reversed polarity
c. YELLOW light: indicates presence of AC power
on the telephone line
Note: If a ground is not available, you may try to switch
the test leads around to different wires within the
pair. The LED indicator will light GREEN when the
red test lead is connected to the ringside of the line
and the black lead is connected to the ground.
B. Indicating telephone Line Condition
Operation (CON’T)
1. Load the 9V battery
2. Slide the toggle switch to the “Off” position
3. Plug the standard 4-pin modular cable into
modular wall jack
4. LED indicator results:
a. BRIGHT GREEN light: indicates a clear line
b. DIM GREEN light: indicates a busy line
c. BRIGHT FLASHING RED and GREEN light:
indicates a ringing line
Note: A DIMLY FLASHING GREEN light will result under
ringing line conditions if the line’s polarity is
reversed. If the test is begun prior to an incoming
call, the call will be blocked.
C. Verifying telephone Lines
1. Slide the toggle switch to the “CONT” position
2. Dial the number of the line you wish to verify
3. While the line is ringing, connect the red lead to
the ring side of the line, and connect the black
lead to ground.
4. Slide the toggle switch to the “Off” position. The
LED indicator will flicker RED and GREEN when
the test leads are connected to the subject pair
5. To verify identification, monitor the line and
switch the test set to “CONT”. This will termi-
nate the call on the subject line
