PCM
+
Operation Manual 3
Section 2 – Transmitter Functions
The PCM
+
TX is a powerful transmitter, capable of
sending detectable signals up to 30km (20 miles) from
the connection point.
The PCM
+
Transmitter is housed in a rugged waterproof
case. To open the transmitter, unsnap the clips located
either side of the handle. In certain situations, the air
pressure within the case may need to be equalized by
unscrewing the small knob located by the handle.
The case must remain open during operation; this allows
the transmitter to remain at optimal temperature.
Before closing the case, disconnect all cables and keep
them away from the heat sink and the support strut.
2.1 Transmitter Control Panel
On/Off switch
LCD and LED indicators. Indicates the current
output in amps and provides critical feedback
on the TX’s operation
AC Input socket
DC Input socket
Output lead socket
Output Level Selector: Select the output level
in amps
Frequency Selector: Selects the frequency
Serial Port: For service personnel only
Heat sink: Vents heat from the transmitter
during operation
Figure 2.1: Tx Facia
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6.
7.
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9.
2.2 Frequency Select
The LCD displays the selected 4Hz output current in
amps.
The three-position rotary
switch selects the applied
mapping frequencies as
follows:
ELF Transmission Lines
ELF maximum range.
35% 4Hz
65% ELF (128Hz or
98Hz)
Figure 2.2: Frequency Selector
ELCD Transmission and Distribution Lines
ELF current direction, medium range.
35% 4Hz
30% 8Hz (current direction)
35% ELF (128Hz or 98Hz)
LFCD Distribution Lines
LF current direction, alternative frequency.
35% 4Hz
30% 8Hz (current direction)
35% LF (640Hz or 512Hz)
The 4Hz mapping frequency is always present.
The operator has a choice of selecting the locate
frequency and current direction indication if required for
identification in congested areas or for faultfinding.
2.3 Output Current Select
This rotary switch allows users to select six different 4Hz
current settings. These are 100mA, 300mA, 600mA, 1A,
2A and 3A.
When the PCM
+
transmitter is in operation, the selected
current will remain at a constant level, unless input power
supply limit is reached.
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