You should design an instrumentation amplifier. 1% tolerance resistor are available in the E6 series (1.0, 1.5, 2.2, 3.3, 4.7, 6.8) over the
range 1 to 6.8M, and use OP-97E op-amps from stable DC supplies of 15V.OP-97E(Vos=60uV, Ios=250pA, Ibias=250pA)
The output is to go to an ADC with an input range of 5V and must NOT clip or saturate with peak loads as then data is lost.
The amplifier is to work with 350 full bridges with a bridge energization voltage of 10V. Grounding arrangements may vary so the common mode
voltage may be 0V, +5V or -5V.
The amplifier must allow measurement of peak strains of up to 5 millistrain with a gauge factor (dR/R)/(dS/S) of 2.1 exploiting as much of the
available ADC input range as possible. The effect of offset errors due to common mode voltage or op-amp effects must be less than 5% of the
peak load signal without trimming or adjustment in any of the grounding configuration.
Last Updated on February 12, 2018 by Essay Pro