dc amplifier with auto-zeroing of thermal drift
- 1 July 1988
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 59 (7) , 1241-1243
- https://doi.org/10.1063/1.1139705
Abstract
A dc strain-gauge bridge amplifier configuration with automatic compensation of thermal drift using common operational amplifiers is presented. The amplifier operation is divided into two steps: one of auto-zeroing and other of amplification of the input signal. The zeroing of the input signal is achieved by switching the bridge excitation to zero periodically at a frequency of about 100 Hz, thus limiting the maximum frequency of the input signal to about 8 Hz. With a gain of 5000, the output voltage drift of the amplifier is measured to be about 1 mV for a temperature change of 40 °C.Keywords
This publication has 1 reference indexed in Scilit:
- Strain-gauge transducer signal conditioning with square-wave ac excitation and thermal error compensationReview of Scientific Instruments, 1985