Power Line Carrier
GARD 8000 SYS RFL Electronics
April 23, 2015 10-16 973.334.3100
Figure 10-5. PLC Analog Module, Carrier Level Indicator Modes - Jumpers
Install a jumper for the required setting as shown below and in Table 10-6. When a jumper is installed
the other two jumpers must be empty (uninstalled). Note that the CLI output levels are calibrated
during the receiver commissioning procedure and no further adjustments are necessary or possible.
The three jumper settings are as follows:
The “0-5V” jumper position (J32) puts a 5K ohm resistor in the circuit. When connected to a
high impedance volt meter the resistor is insignificant and the output is 2.5 volts at mid scale.
The scale is 0.25 V/dB and the resolution is 1 dB. This means that a signal 6 dB higher than
commissioned level will result in an output of 4.00 volts. Similarly, a drop of 6 dB will result in
an output of 1.00 volts. The maximum scale is +/- 10 dB or 5.00V to 0V.
The “0-1 mA” jumper position (J34) is designed for panel meters with an input load of 5k
Ohms. The full scale output of 5V through 5 Kohms will result in 1 mA. There is a 50 ohm
resistor in the output circuit to protect against short circuits. The scale will effectively be 0.05
mA/dB.
The “0-100 uA” jumper position (J33) is designed for low impedance current sensors. Full
scale will result in 5V/50Kohms or 100 uA. The scale will effectively be 5 uA/dB.
Table 10-9. Carrier Level Indicator loads
0-5V position, high
impedance load
(J32)
0-1mA position,
5K load
(J33)
0-100 uA position, low
impedance load
(J34)
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