Circuit Modulation
Parallel resistance application creates a deliberate change in the output voltage of a Wheatstone bridge sensor network to simulate specific strain or pressure loads. This wheatstone bridge shunting alters the impedance balance by connecting a known resistor across one arm of the bridge circuit. Laboratory calibration procedures utilize this method to verify the linearity and gain of signal conditioning electronics.
Bridge Impedance
External resistors installed in parallel with a bridge leg introduce a predictable offset that allows for system verification without physical deformation of the transducer. The shunt process enables technicians to confirm sensor sensitivity at reference conditions before the installation of a device. A calibration certificate relies on these known values to document the deviation from an ideal output curve.
Signal Drift
Sensitivity reduction occurs when the shunt resistor value approaches the bridge resistance, leading to non-linear response characteristics. Temperature fluctuations affect the stability of the added resistance, which potentially introduces errors during the verification sequence. Accuracy depends on the precision of the shunt resistor and the stability of the excitation voltage supplied to the circuit.
Electronic Verification
Monitoring the resultant voltage shift allows for the systematic checking of bridge completion modules and data acquisition channels. Regular application of a defined shunt resistor confirms that the amplification stages perform within the specified tolerance limits. Effective shunting provides a reliable method for validating measurement hardware throughout the functional lifespan of the sensor.
