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imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19

120 Device description

5.8.4.1.1 Thermocouple mounted with ground reference

The thermocouple is mounted in such a way that it already is in electrical contact with the device

ground / chassis.

This is ensured by attaching the thermocouple to a grounded metal body, for instance. The thermocouple

is connected for differential measurement. Since the unit is grounded itself, the necessary ground

reference exists.

In the operating software, don't activate the option "Isolated thermo couple" at the amplifier tab.

Thermocouple measurement with ground

reference

It is not a problem if the ground potential at the thermocouple differs from that of the device units by a

few volts. However, the maximum allowed common mode voltage may not be exceeded.

Important Note

The negative signal input -IN may not be connected to amplifier ground point -VB. Connecting them

would cause a ground loop through which interference could be coupled in.

If you accidentally activate the option "Isolated thermo couple" on the Amplifier page, there is a

danger that a large compensation current will flow through the thermocouple's (thin) line and the

connector plug. Compensation currents are a danger with every single end measurement. For that

reason, single end measurement is really only allowed -and only then really necessary- if the

thermocouple has no ground reference of its own.

IMC C SERIES User Manual

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