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The OAT Analog Tacho Process VI locates tachometer pulses in analog tachometer signals. You can set the threshold, hysteresis, pulse width, and slope of a signal with this VI to identify the time instances of tachometer pulses. For digital tachometer signals, the OAT Digital Tacho Process VI calculates time instances of the tachometer pulse by comparing the counter timebase value with the tachometer count reading from the counter.