Amprobe TT-300 Mini-Butt-Set - Manual (Page 6)

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OPERATION INSTRUCTIONS (CON’T)
INSULATION RESISTANCE & CAPACITY MEASUREMENT
1. Connect the alligator clips to L1 and L2 of subscriber side.
2. Push the PUSH/INSUL (7) button.
3. The insulation resistance will be displayed on the 'Mega Ohm meter,
when the METER CALL button is pressed.
Generally, there are two conditions:
Normal condition (good insulation between L1 and L2)
The meter scale goes to 0.2
Ω
generally and then back. This is caused
by the capacity of the connected subscriber's telephone or the line and
terminal.
Abnormal condition (bad insulation between L1 and L2)
The meter scale goes up to a low value (below 1M
Ω
) and stays there.
This indicates a faulty circuit on L1 and L2.
Note - The meter will not move if the line is an open circuit.
CABLE LINE CONTINUITY TEST
With another T T-300 or other handset tester, you can test cable continuity.
1. By using the "Test Line Cord", make a hot-line with the other T T- 3 0 0.
2. Push the CALL (PUSH) switch on both T T- 3 0 0’s and the LED's turns
on. Both T T- 3 0 0’s are able to communicate now.
3. By using the "Line Cord for Continuity" at the CONT jack, you can hear
a tone when the hot-line and "Line Cord for Continuity" are in a loop.
Refer to the figure below.
Figure 2
BATTERY CHECK
Indicates if 9-volt battery requires replacement.
1. Connect the two alligator leads together.
2. Press the PUSH / INSUL (7) button. A good battery is indicated if the
needle is in the BT section of the meter. If the needle is below, the bat-
tery should be replaced.
Document2 2/12/01 4:26 PM Page 6