BRIDGE2: DC-bridge measurement 253
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.1.1 DC- bridge readings (measurement target: Sensor)
The amperage rating of imc CANSAS-BRIDGE2's voltage source allows connection of 120 measurement
bridges in all ranges.
The terminal +Sense serves to compensate voltage drops along long cables, which would otherwise
distort the readings made. It is used to close the control loop which ensures the required bridge voltage
is available exactly where the line SENSE (which bears no current) is connected, namely directly at the
sensor. If this function is not used, (e.g. if fewer lines are available and the resulting temperature-
dependent gain error is compensated in approximation by a scaling factor) then +Sense must be
connected to +VB in the terminal plug.
Bridge measurement is a relative measurement (a ratiometric process) which evaluates the fraction of
the bridge excitation voltage fed in that passes through the bridge (typically 0,1% range, corresponding
to 1 mV/V). System calibration directly refers to this ratio, the bridge input range. This means that the
absolute bridge excitation voltage isn't relevant and need not necessarily conform to the rated overall
accuracy of the measurement.
To obtain the best result with the least noise possible, the bridge and the imc CANSAS module should be
held at a shared reference voltage (ground). The ground terminal in the connection plug is designated
CHASSIS.
When connecting, observe the block diagram shown above and the accompanying notes.
The following bridge types can be operated as sensors by imc CANSAS-BRIDGE2:
Setting the bridge configurations
Channel0x -> Index card “Bridge circuit” -> Combo box “Bridge configuration”
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