1 battery holder
4 probes connector
2 display
5 measure mode select
3 measure switch
DESCRIPTION
The A694 is a short circuit locator for
electric and telephone cables wind on
the reel; it gives the position of the
fault from the inside or outside end of
the cable, in percentage to the total
cable length.
HOW TO USE IT
Ground the cable to be tested from
any electrical charges.
If wire “A” is short with “B”, connect
the crocodile clips to the cable:
1)
the crocodile clip “I” to “A”
from the inside end.
2)
the crocodile clip “E” to
“A”
from the outside end.
3)
the crocodile clip “COM” to
“B” from the outside end.
Perform a calibration test:
turn the measure mode knob to “Ref”
and push the measure switch, the
display will show 100.0 ± 0.1 %,
otherwise:
a)
the cable has a total
resistance below 0.1 Ω
b)
the cable has some
electrostatic charges within
c)
the test leads are broken.
Connect
wire
with
test lead
A
E
B
COM
B
COM
A
I
Lead connections
Turn the measure mode knob to “E”
and push the measure switch, read on
the display the value LE, length of the
cable (in percentage to the total cable
length) from clip “E” to the short.
Switch the crocodile clip “COM”
to wire “B” from the inside end
push the measure switch, read on the
display the value LB.
If LE = LB ± 0.1 %, then the cable has
just one short at distance:
(Value LE) x (total length of cable)
100
from the outside end of the cable.
If LE ≠ LB ± 0.1 %, the cable has
more than one short and the distance
to fault is calculated making use of the
program a694503e.exe downloaded
from the website www.agmel.com .
WARNINGS AND SAFETY RULES
The locator is protected against
electrical charges, but in some
conditions these charges on the wire
can
accumulate
and
can
be
dangerous
for
the
technician,
therefore
always ground the cable
before any measurement
Do not short the clips “I” with “E” for a
long time, otherwise the battery life
will be reduced.
The calibration test is possible only
after a cable is connected.
The crocodile clips “I” and “E” are
special Kelvin clips,
do not force the
opening.
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