Sensor Bridge Calibration

Sensor Bridge Calibration

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On: 28 Jun, 2019

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Category: Sensors

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Equation (3.31) shows that the sensitivity of a sensor bridge depends on the supply voltage V, on the sensor's resistance under no load condit-:ns Rs,
and on the ratio k between the resistance of the arms. To avoid the need to measure k, whic...

Equation (3.31) shows that the sensitivity of a sensor bridge depends on the supply voltage V, on the sensor's resistance under no load condit-:ns Rs,
and on the ratio k between the resistance of the arms. To avoid the need to measure k, which may require opening all the bridge junctions, we can use
the arrangement shown in Figure 3.24.

sensor bridge calibration 1.png

With the switch opened, for x : 0, the bridge is adjusted until yo : 0. After closing the switch with no load applied to the sensor, the output deflection is similar to that obtained from a change x in R3

sensor bridge calibration 2.png

We need to measure only Rs and the calibration resistor in order to calculate the bridge sensitivit! from the measurement of V". If the bridge has more than one active arm, other calibration resistors can be connected one at a time by closing the respective switch, for example, with a relay in an automatic system.

If the calibration resistor or resistors cannot be placed close to the respective sensors, we must avoid placing lead wires for those resistors in series
with the sensors. That is, we should use separate wires. Measurement conditions may be different from calibration conditions, resulting on a nonzero bridge output at null conditions. This problem can be solved by a modified bridge [I4], which consists of adding two known resistors R in series with each of R3 and Ra. Either the junction between R and R3 or R and Ra is driven by a current 1 so that the bridge is rebalanced at null at the measurement conditions. 1 is derived by a feedback system from the bridge gutput at null conditions, set either manually or under computer control.

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