6.1.5 Mute function
Loose all keys, connect clamps to the telephone line, press Hook and then press “MUTE”,
the other side can not hear our voice, and press “MUTE” again, it becomes normal.
6.1.6 P/T transfer function
Loose all keys, under hook-off status and no ringing signal, this tester can do P/T transfer
operation. Pressing “*” more than 3 seconds can realize pulse dialing and tone dialing
transformation, after successful transformation, the LCD will display “pulse” or “tone”.
6.1.7 High DC voltage indication
Connect this tester to the telephone line, if there is high DC voltage, the H-DCV light will be
bright all the time. Please do not off-hook in order to damage the tester.
Notice:
1. If the line has high AC/DC voltage, please do not use telephone function.
2. Only the line which has opened caller ID service can has caller telephone number function.
3. Line high voltage indicator can only apply to lines with low current and the range can not
exceed 250V.
6.2 Tester test
Press “Phone/Tester” and connect test line of tester to user line, which will be tested, you
can have the tests like followings:
6.2.1 AC V & DC V test
In the normal status, press “Phone/Tester” (“Phone/Tester” LED on) to have the voltage test.
It means that there is high AC voltage in the line if the LCD display like following and there is
fluting sound. Please take the clamp quickly.
The LCD will display the line voltage value 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; the line, which
is connected by the red clamp, is negative port and the black clamp is positive 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
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