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Physical Characteristics
Table 1. LED Indicators
TALK Lights green when the test set is in Talk mode.
Lights red when the test set is in Talk mode and
the voltage on the line is too low or too high.
See "Talk Mode" on page 9.
GPS03.eps
POLARITY Lights red when the polarity of the dc voltage
across the line’s Tip and Ring wires is reversed.
If you connect the red clip to a more positive
voltage than the black clip (reverse polarity),
the POLARITY LED lights red. If you connect
the red clip to a more negative voltage than its
black test lead, the LED lights green. The test
set operates correctly if the polarity is reversed.
This LED operates only when the test set is off-
hook.
MUTE Flashes green when the test set is in mute
mode. See the description of the
N key on
page 7.
VDC In Monitor mode, when you press V the VDC led shows the range of voltage that is on the line:
0 V dc to 4 V dc: Off
4 V dc to 42 V dc: Flashes green
42 V dc to 53 V dc: Steady green
53 V dc to 140 V dc: Flashes red quickly
>140 V dc: Red for 3 seconds, then off. Also there is an audible alarm.
Warning
Voltage above 140 V dc is possibly dangerous to you and the test set. If the test set
shows voltage above 140 V dc, carefully remove the test leads from the line. Be
sure to hold the clips by their insulated boots and do not touch the metal parts of
the clips. Do not touch the clips together while they are connected to a line that
has high voltage.
mA In Talk mode, when you press
V the mA led shows the range of current that is on the line:
< 23 mA: Flashes red
23 mA: Flashes green
BATTERY When the BATTERY LED flashes red, replace the battery immediately. See "Replacing the
Battery" on page 13.
9


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