ST230F TELEPHONE LINE TESTER
7
The LCD will display the line voltage figure automatically if there is DC voltage in the line. In the following graph, it means
that there is minus 64.6V DC voltage in the line; then the line which is connected by the red clamp is positive port and the
black clamp is negative port.
Purpose: This function can be used to test whether the ringing up/off voltage of line is normal or not; it can help lineman to
distinguish the positive port and negative port of the line quickly in order to ensure whether they connect the line correctly
or not when install the relevant equipment.
6.2.2 Insulation test
Press
“Phone/Tester”
in the normal status to judge there is no voltage in the line, and keep pressing
“Test”
about 3
seconds to test the insulation. The LCD will display the insulation resistance figure automatically like the following graph. If
the insulation resistance is less than 20MΩ and there is a fluting sound, it means that the insulation resistance figure of the
line is small; there is bad insulation fault.
Please take off the user phone if you want to test the insulation resistance of the line.
It can be confirmed whether the fault has been canceled or not through the line insulation test after checking the user line.
6.2.3 Open line test
In the normal status, connect the tester to the line which will be tested and press
“Pone/Tester”,
after confirm there is no
voltage in the line, keep pressing
“Test”
for about 3 seconds. It means that the line is break if the LCD only displays MΩ.
6.2.4 Earth insulation
Like the above operation, connect the black clamp to earth line and the red clamp to the line which will be tested. The LCD
will display the earth insulation degree.
6.3 Call user & talk
Disconnect the local side, connect the test line to passive user’s line, press
“Phone/Tester”
(its right
LED on
), press
“Talk”
after judging there is no voltage in the line and then press
“Test”,
and you can call user telephone of the line. (
Call
LED on indicates the signal has been sent out); that
Talk
LED is on indicates user off hook, loose “Test” enable to talk.
This function can be used to check the line condition of repair.
6.4 Phone test
The phone quality can be tested by the ST230F.
Connect the tester line to the user phone through clamps or assistant line and ring the user phone, it means that the user
phone is normal if it rings normally; the phone quality is good if the quality of the communication voice is good, otherwise,
there are faults in the phone.
6.5 Check wire pairs
－
－
－
－
64.6V
16.4 MΩ
~
