Advantech iDAQ-871 handleiding
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iDAQ-871_873 User Manual 18
Strain value can be calculated by the following equation:
where GF is the gauge factor of the strain gauge sensor provided by the sensor man-
ufacturer, Vr is the ratiometric bridge output value measured by the ADC
Shunt calibration can be used to compensate for errors due to lead resistance.
3.2.2 Half Bridge Type I Configuration
This section provides information for the half-bridge type I strain gauge sensor con-
figuration. This configuration measures either axial or bending strain. Figure 3.6
shows how to position the strain gauge sensors in both axial and bending configura-
tions. Refer to 2.3.2 Half-Bridge Input Signal Connection for detailed signal wiring of
this configuration.
Figure 3.6 Half-bridge type I configuration measuring axial and bending strain
The half-bridge type I configuration has the following characteristics:
One active strain gauge sensor R
B1
measuring the strain and one dummy strain
gauge sensor R
B2
for temperature compensation. R
B1
is mounted in the princi-
pal direction of axial or bending strain. R
B2
is mounted in close thermal contact
with the strain specimen but bonded to the specimen, and is usually mounted
perpendicular to the principal axis of strain.
Sensitive to both axial and bending strain.
Two half-bridge completion resistor R
HB
are required. They are provided by the
device.
Both a shunt calibration resistor R
SC
and a switch are provided by the device.
Sensitivity ≈ 0.5 μV/V per με, for GF = 2.0.
Strain value can be calculated by the following equation:
where GF is the gauge factor of the strain gauge sensor provided by the sensor man-
ufacturer, Vr is the ratiometric bridge output value measured by the ADC
Shunt calibration can be used to compensate for errors due to lead resistance.
strain
4
V
r
–
GF
1 2
V
r
+
--------------------------------=
V
r
VAI strained
VAI unstrained
–
VEX
---------------------------------------------------------------------------------------=
strain
4
V
r
–
GF
1 2
V
r
+
--------------------------------=
V
r
VAI strained
VAI unstrained
–
VEX
---------------------------------------------------------------------------------------=
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Productinformatie
| Merk | Advantech |
| Model | iDAQ-871 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5398 MB |
