3
Shield
6
Probe connector wiring
A two-wire probe can also be used with the reference thermometer. It is connected by attach-
ing one wire to both pins 1 and 2 of the plug and the other wire to both pins 4 and 5. If a shield
wire is present, it should be connected to pin 3. Accuracy may be signicantly degraded using a
two-wire connection because of lead resistance.
4-20mA Connectors (2)
The 4-20mA connectors allow current and/or voltage probes to be connected for measurement
of associated devices.
PRT/RTD Connector (3)
The 4-wire PRT/RTD connectors allow the user to connect 3-wire and 2-wire (with jumpers,
see Figure 9 on next page) PRT/RTDs to the readout. The correct wiring for the 4-wire PRT/
RTD is shown on the instrument. Figure 9 shows the correct wiring for a 2 or 3-wire PRT/RTD
(see Section 1.5.2, Immunity Testing, on page 8 for information on using clamp-on ferrites).
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