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Page 43 of 97
Issue: 1.04
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4 Connecting Thermometer Sensors
4.1 The “Cable-Pod” Connectors
The Eichmann “Cable-Pod”™ connectors used on the microK have gold-plated
tellurium-copper contacts. These generate exceptionally low thermal EMFs when
connected to the copper terminations used on standards grade thermocouples.
The connectors accept 4mm plugs, bare wires or spade terminations.
Additionally, they are spaced on 19mm (¾”) pitch so that they can be used with
standard 4mm-to-BNC adaptors (not supplied) for connecting to BNC terminated
SPRTs. The mechanism is designed so that the clamping surface does not rotate
as it clamps the wire in order to avoid damaging it.
The “Cable-Pod”™ mechanism is made from a high strength polymer but
nonetheless may be subject to mechanical damage if the connectors are over
tightened. Please tighten the terminals to a light “finger-tight” level in order to
ensure that they are not subject to undue wear or premature failure. This is all
that is required electrically – do not try to use the connector to provide strain
relief or tension a cable.
4.2 Connecting PRTs (4-wire)
The microK’s resistance measurement system is optimised for high accuracy, 4-
wire resistance measurement. The PRT should be connected to the chosen input
channel in accordance with the schematic shown on the microK’s front panel, as
follows:
SPRT
V
I
