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Drift Compensation in Data Acquisition Using the KPCI-3108 AutoZero Technique
Keithley Instruments, Inc.
Measurement drift is one inherent attribute that all test and design engineers must address. Gradual zero drift, as well as
reference and gain drifts, are essentially caused by the effect of ambient temperature on electronics. Other factors such as
aging of electronic components, humidity, and pressure could also play a role in long term drift.
An intelligent analog design is very important for predicting and balancing potential drifts introduced by different components
in the circuit. A typical example is thermocouple measurement, which requires microvolts of sensitivity and high gain
amplification. Any small drift within the measurement device would lead to |