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Wheatstone Bridge Theory and Load Cell Application
A detailed technical reference on bridge balance, strain-gage behavior, millivolt-per-volt output, instrumentation, shielding, calibration, and PLC integration.
Document overview
A bare strain-gage load cell is normally a precision Wheatstone bridge, not a current-loop device. The bridge requires stable excitation and produces a small differential millivolt signal that should normally be handled by a dedicated load-cell transmitter, weigh module, or instrumentation amplifier before connection to a PLC.
Publishing and ownership
Validus Group Inc.
Original technical publication and content owner. Fred Fisher remains President of Validus Group Inc.
North Rivet
Current web presentation and Technical Library. Fred Fisher is Founder & Principal Engineer.