abem WalkTEM 2, Краткое руководство пользователя

Страница: 8 / 20

P a g e | 8
ABEM WALKTEM 2 ABRIGDED USER MANUAL
4. CENTRE LOOP LAYOUT (TL-400, 20X20m Transmitter Loop)
A. Similar layout to using the TL-1k6:
-
pull out the TL-400 transmitter loop first, leaving
the free end of the loop next to the instrument
and walking around with the cable drum.
-
The loop has corner markers every 20m;
-
next lay the RC-5 at the centre of the TL-400;
-
the RC-200 cannot be used with the 20x20m
loop as there is not enough space between the
two loops and interference will occur;
-
now connect the RC-5 to the instrument,
typically via Input A;
-
the TL-400 is connected to the
instrument via the 3m lead-in
cable again but also
through a
1.5 Ohm “ choke ” resistor on
one side of the cable (in
series with the loop, not in
parallel). This counteracts
the low resistance
associated with this very short
transmitter loop and limits the
maximum current to safe levels;
-
see Section 3 “ Damping Resistor Decisions ”
for instructions on manually choosing a
damping resistor.
B. Powering the TX:
- a 20x20m transmitter loop should only be
powered with 12V (i.e. 1 battery).
CHARGING THE INTERNAL BATTERIES
The WalkTEM 2 RX has two internal batteries and these can be charged in the instrument
or the separate charging cradle.
The TX-60 battery is non-removeable and can only be charged using the Office Power Supply; the
TX-60 must be switched on to charge (but it does not need to be attached to the WalkTEM 2 RX).
The TX-8 and TX-20 do not have internal batteries.