Operation
Probe Preparation 2
2-29
Probe Preparation
Clamp-On Ferrites
Ferrites clamped around the PRT/RTD input and the thermocouple (TC) probe reduce the
risk of electro-magnetic interference (EMI) that can cause inaccurate measurements. If
the Calibrator is used in an area that is susceptible to known EMI (such as industrial
equipment or motors), attach a supplied Ferrite to the probe cable as follows:
To attach a ferrite to a probe cable (see Figure 2-5):
1. Make a loop in the cable near the connector.
2. Clamp the ferrite around half of the loop as shown.
3. As necessary, the Ferrite can be snapped open and moved to a new probe.
Connector
Clamp-on Ferrite
Probe
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Figure 2-5. Clamp-On Ferrite Installation
Reference PRT Connection Preparation
The REF PRT connection on the front panel attaches a reference probe to be used as a
reference thermometer. Prepare the reference probe as follows:
4-Wire Reference Probe Wiring Instructions
Connect a 4-wire reference probe as follows (see Figure 2-6):
1. Connect one pair of wires to pins 1 and 2.
2. Connect the other pair of wires to pins 4 and 5 (pins 1 and 5 source current and pins 2
and 4 sense the potential).
3. If a shield wire is present, connect it to 3, which is also used for the memory circuit.
Pin 6 is only used for the memory circuit.
2-Wire Reference Probe Wiring Instructions
Connect a 2-wire reference probe as follows (see Figure 2-6):
Note
Accuracy can be significantly degraded using a 2-wire connection because
of lead resistance.
1. Connect one wire to both pins 1 and 2.
2. Connect the other wire to pins 4 and 5.
3. If a shield wire is present, connect it to pin 3, which is also used for the memory
circuit. Pin 6 is only used for the memory circuit.
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