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

113CS-7008-FD, CL-7016-FD

5.8.2.1 Full bridge

A full bridge has four resistors, which can be four

correspondingly configured strain gauges or one

complete sensor which is a full sensor internally. The

full bridge has five terminals to connect. Two leads

+VB and -VB serve supply purposes, two other leads

+IN and -IN capture the differential voltage. The 5th

lead SENSE is the Sense lead for the lower supply

terminal, which is used to determine the single-sided

voltage drop along the supply line. Assuming that

the other supply cable +VB has the same impedance

and thus produces the same voltage drop, no 6th

lead is needed. The Sense lead makes it possible to

infer the measurement bridge's true supply voltage,

in order to obtain a very exact measurement value in

mV/V.

Please note that the maximum allowed voltage drop

along a cable may not exceed approx. 0.5 V. This determines the maximum possible cable length.

If the cable is so short and its cross section so large that the voltage drop along the supply lead is

negligible, the bridge can be connected at four terminals by omitting the Sense line.

Note

For the predecessor model C-70xx pin -SENSE must never be unconnected! In that case, -SENSE and -VB

must be jumpered.

5.8.2.2 Half bridge

A half bridge may consist of two strain gauges in a

circuit or a sensor internally configured as a half

bridge, or a potentiometer sensor. The half bridge

has 4 terminals to connect. For information on the

effect and use of the SENSE lead, see the description

of the full bridge .

The amplifier internally completes the full bridge

itself, so that the differential amplifier is working

with a full bridge.

Note

It is important that the measurement signal of the

half bridge is connected to +IN. The -IN access leads

to implausible measured values and influences the

neighbor channels.

113

IMC C SERIES User Manual

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