Next: 4.2 Additional Requirements for
Up: 4 Signal Conditioning
Previous: 4 Signal Conditioning
The primary purpose for the analog signal conditioning circuitry is to modify the sensor
output into a form that can be optimally converted to a discrete time digital data stream by
the data acquisition system. Some important input requirements of most data acquisition
- The input signal must be a voltage waveform. The process of converting the sensor
output to a voltage can also be used to reduce unwanted signals, i.e., noise.
- The dynamic range of the input signal should be at or near the dynamic range of the
data acquisition system (usually equal to the voltage reference level, Vref, or 2*Vref).
This is important in maximizing the resolution of the analog to digital converter
- The source impedance, , of the input signal should be low enough so that
changes in the input impedance, , of the data acquisition system do not affect
the input signal.
- The bandwidth of the input signal must be limited to less than half of the sampling rate
of the analog to digital conversion.
Thu Oct 17 16:32:33 PDT 1996