ESD C.3030.02, Manual

Page: 28 / 103

Connector Assignments
Manual • Doc.-No.: C.3030.21 / Rev. 1.4
CAN-CBX-AI420 Page 28 of 103
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4.3 Analog Inputs
4.3.1 Analog Input Circuit
Fig. 12: Analog input circuit (example: channel 1)
Attention:
The internal circuit of the
23
-converter (see figure below) and the wiring of the sensor
signal cause a gain-error at the measuring. This fault is the smaller, the lower the
resistance of the sensor is chosen.
Furthermore the resistors of both measuring lines of the differential analog inputs should
be identical.
Fig. 13: Principle of the internal circuit of the
23
-converter
The gain-error increases with increasing resistance R
SOURCE
(see figure above).