Section 6 - Reference Probe
An electrically isolated 100Ω Class A RTD probe has been embedded into the
target plate heater assembly to be used as a reference. This feature is commonly
used in conjunction with a precision thermometer, ohmmeter or temperature
recording device. The maximum current being passed through the RTD should
never exceed 0.3 mA (constant DC). A connector has been provided with your
calibrator for connection to this reference probe. Notice that at each temperature,
a given resistance will be measured at the reference port. The resistance is
measured across PIN1-PIN2 or across PIN1-PIN3. PIN2 and PIN3 are connected
to the same side of the RTD.
Figure 9. Internal Reference Probe Connections
6-1
BB702 Reference Probe
6
TARGET PLATE ASSEMBLY
RTD REFERENCE PROBE
REFERENCE
PROBE
CONNECTOR
BLACK WIRE
1
2
3
RED WIRE
BLACK WIRE
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