Setting the display

Devices with interface or digital display

Force sensors and torque sensors are equipped with strain gauges in a bridge circuit. When a force or torque is applied, the output signal of the bridge circuit changes.

The output signal of the bridge circuit is usually specified as the voltage ratio U_d/U_s: "differential signal Ud" relative to the "supply voltage U_s"

CV characteristic

During sensor calibration, the slope of the sensor characteristic curve is determined. This slope is indicated on the test reports or calibration certificates as the so-called "characteristic value" (CV).

The characteristic value is the output signal U_d/U_s of the bridge circuit at the sensor's nominal force (or torque), minus the sensor's zero signal. The output signal of the bridge circuit is specified as the voltage ratio U_d/U_s.

Nominal force divided by characteristic value is a straight line through the origin (0,0) of the coordinate system. The unit of the characteristic value is mV/V, and in a 2-point calibration, the characteristic value is determined at the nominal force.

Nominal force F_N

The sensor is designed for the nominal force FN (or nominal torque MN). Calibration is usually performed at nominal force or at partial loads, e.g., from 20%.

Input measuring range MR

The measuring amplifier converts the differential signal U_d of the Wheatstone bridge into a digital signal. It provides the required supply voltage Us for the sensor's Wheatstone bridge. The input measuring range MR for the voltage ratio U_d/U_s is usually fixed to, for example, 2.0000 mV/V or 3.5000 mV/V, or can be adjusted in specific steps using a jumper or configuration software. The input measuring range MR is usually specified on the measuring amplifier's nameplate.