Bridge Amplifier Linearity Investigation with a Cascaded Inductive Voltage Divider Setup

Abstract

We present the linearity investigation of high precision bridge amplifiers as used in static force and torque measurements. The setup with cascaded inductive voltage dividers allows a much more detailed bridge amplifier linearity analysis than it is possible with the BN100 bridge standard or a recently proposed resistor-based strain gauge bridge transducer simulator. The bridge amplifier linearity deviation can be determined with an expanded (k=2) uncertainty of 2 nV/V and only with the presented setup it is possible to potentially reduce the relative uncertainty for nominal ratios below 1 mV/V.