Three current transformers on this assembly monitor the output current, one current
transformer per output phase. Each current transformer has two burden resistors for the two
different current measurement ranges. The burden resistors are selected via small relays
controlled by the AMP 4 control line.
Potentiometers are used to adjust each high current range burden resistor:
1. Phase A, adjust via R6
2. Phase B, adjust via R10
3. Phase C, adjust via R14
5.8 Output Board
The Output board, module assembly A12, takes the amplifier outputs from the Range/Relay
board, routes them through output relays and then to the output terminal strip mounted to the
rear panel. The output relays are controlled via the CNF signal.
This board also has remote sense amplifiers to monitor output voltage. The voltage is
monitored at the output terminal strip sense points if the output relay is closed (output active).
The voltage is monitored internally if the output relay is open.
5.9 IEEE 488/RS232 Interface [Option]
The 2003RP can optionally be fitted with a combined RS232C and IEEE 488 interface board,
A3. This board assembly has optocouplers for isolation of the programming interface and
the Remote Inhibit and Function Strobe connections.
The GPIB address for the AC source is selected by a DIP switch on the rear panel. Only one
interface can be active at any given time and must be selected using DIP switch position 6.
(Refer to Figure 8-2).
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