User Applications and Wiring
31
Remote Metering
Any number of meter pairs can be driven by the meter amplifiers up to 1mA into a total load of 470 to 1400 ohms,
with out effecting scale shape. Long line losses are compensated by adjusting amplifier gain and full scale meter
current after network is balanced and amplifier zero setting. Usually RFI prevention by shielding, using chokes and
by-pass capacitors, is necessary only near the Wattcher unit.
Figure
17
Remote Monitors and Meters
Reflected
M
M
Remote
Off Site
Meters
Remote
Off Site
Meters
M
M
Forward
Shield
Ground
Shield
Ground
Remote
Off Site
Meters
Remote
Off Site
Meters
+
-
+
-
+
-
+
-
DC Power Supply Connections
A DC power supply can be connected to allow for mobile operation of the Wattcher unit.
The positive terminal of the DC power supply must be connected to Terminal 1. The negative terminal must be
connected to terminal 2. The minimum DC voltage required for operation is +12.7Vdc. The maximum DC voltage
allowable is +16Vdc. The maximum current draw for this range is 400mA.
Figure
18
DC Power Supply
External
DC Power
Source
+
-
