Data Safe Practices; High Voltage Lockout Operation; Configuring Your Test Set; Last Number Redial - Fluke TS 42DLX User Manual

TS42DLX Deluxe Test Set
Users Guide

Data Safe Practices

Always monitor the line for an audible signal before
attempting to go off-hook to draw dial tone. To detect
data signals within the human audio range, such as
produced by voiceband modems and subrate DDS
transceivers, you must listen to the line using the test
set's audio monitoring capability. If you hear the
telltale hiss of a voice band modem or low frequency
data transceiver, do not move the TALK/MONITOR
switch to T. It will go off hook and it will interfere with
the voice band modem or data transceiver. To avoid
this, try another line or wait until the line is idle.
When going from pair to pair searching for tracer tone
or dial tone it is best to connect the test set to Tip and
Ring of the pairs. Avoid the practice, either in Talk or
Monitor mode, of clipping one lead of the test set to
ground, and using the other lead to search for tracer
tone or dial tone on a block. This may create an
electrical imbalance on a data line that will disrupt
service. Once you find the voice line you are searching
for then it is OK to test Tip to ground or Ring to ground
on that line.
Be careful not to short the test leads together if you are
connecting to a data line (or any line for that matter),
as this could bring down the service.
It is best to put the test set in Monitor mode when
troubleshooting a line, searching for capacitance kicks,
RF signals, craft provided tones, etc.

High Voltage Lockout Operation

The TS42DLX Deluxe is designed for use by Outside
Plant and Central Office technicians in environments
where analog voice lines co-exist with lines that carry
high DC voltage.
Accidentally going off-hook on a line carrying a high
DC voltage can damage the power supply feeding the
line. To prevent this from occurring, the TS42DLX
Deluxe provides an automatic high voltage lockout
function. When a TS42DLX Deluxe is connected to a Tip
and Ring pair with its TALK/MONITOR switch in the
TALK position, it will measure the voltage on the line
prior to going off-hook. If the measured voltage
exceeds 140 Vdc, the test set will lockout, preventing
itself from going off-hook.
10
The high voltage lockout condition is indicated by a
solidly lit HI Vdc LED. In the event of a high voltage
lockout, the TALK/MONITOR switch should be set to M
and the test set leads should be carefully removed from
the line.
W
Do not short the test leads to each other
while it is connected to a line carrying high
voltage.
There is no way for the operator to override a high
voltage lockout. Lines with voltages exceeding 140 Vdc
do not carry analog voice services.

Configuring Your Test Set

Last Number Redial

In the Tone or Pulse dialing mode, the last number
dialed can be automatically redialed by pressing the
LNR key after going on-hook and then back off-hook.
To redial a number, the LNR key should be the first key
pressed after going back off-hook.
If, after going off-hook, any dialing key is pressed, the
LNR memory will be cleared and the value of the
pressed key will be the first number stored in the
cleared memory.
The PAUSE key is considered a dialing key. If pressed, it
is stored in the redial memory, taking up one of the 23
digit slots.
In tone dialing mode, the dialing keys that are
permitted to be stored in LNR memory include
1,2,3,4,5,6,7,8,9,0,*,# and PAUSE. If the star (
pound (#) keys are pressed in pulse mode they will be
∗
ignored. The star ( ) and pound (#) keys will not be
redialed when the test set is in pulse mode even if the
redial memory includes star (
Caution
∗
) and
∗
) and pound (#).