How is it that Hall sensors and/or wiring can fail (by various reports) within a relatively narrow RPM band, yet switch well (or at least well enough) at other parts of the RPM band?
Presumably the scope waveform would be abnormal at the problem RPM zone
- either a drop in current supply, noisey ground, or roundness or incorrect voltage in the on/off switching
Would the waveform possibly look "square" (relative to its duty cycle) at RPMs where the sensor apparently performs well (or well enough to slip inside the operating range specs for whatever application it's being used on)
Thank you, Lance