Advantech iDAQ-871 handleiding
Handleiding
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15 iDAQ-871_873 User Manual
Chapter 3 Function Details
Figure 3.2 Ratiometric measurement
3.1.2 Error Correction in Bridge Input Measurement
Field wiring is used to connect sensors to measurement devices that have a non-
zero resistance, and resistance of each bridge arm also has errors. These undesired
factors create errors in bridge input measurement. The device provides mechanisms
to correct the errors: remote sensing, offset nulling, and shunt calibration.
3.1.2.1 Remote Sensing
Remote sensing corrects for errors due to resistance of excitation voltage leads. It is
useful in applications that employ long or small wires to connect the sensors to the
measuring device, as the wires have high resistance.
As shown in Figure 3.3, current generated by excitation voltage source will flow
through the positive terminal of the source, the bridge, to the negative terminal of the
source (indicated by red lines). The wire resistance (R
LEAD
) that connects both posi-
tive terminal and negative terminal of the source to the bridge causes voltage drops
(V
LEAD
), which results in a smaller voltage across the bridge compared to the actual
excitation voltage generated by the source. This voltage difference leads to gain
reduction in the measured result.
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Productinformatie
| Merk | Advantech |
| Model | iDAQ-871 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5398 MB |
