From Alliance Sensors Group
S1A used to solve multi-channel LVDT measurement system susceptibly to heterodyning, "beating" between channels (cross talk).
When LVDT signal cables are bundled together or laid close to each other in a wire trough, even for short distances, the result can be a mutual interference phenomenon called heterodyning or "beating". This effect is created when the frequencies of the oscillator in the individual signal conditioner driving the excitation signal to each LVDT vary slightly. Since the signal cables are close together, they can capacitively couple among each other, resulting in a very low frequency signal that is the difference between the frequencies of the individual oscillators. This difference frequency signal can ride on the DC output of the LVDT signal conditioners, appearing as low frequency ripple or noise with a period measured in fractions of a second, or as a repetive slow drift with a period of many seconds
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Topics of Interest
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