IMC CANSAS - Page 191

Measurement modes 191
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
5.1.3.1.1.2 Time Measurements
Exclusive measurement of time is performed as:
time (of two successive signal edges)
pulse time (time from the beginning of one sampling interval until the next signal edge)
PWM
Any other pulses occurring within the sampling interval are not evaluated for these measurement
types.
time
pulse time
5.1.3.1.1.3 Combination Mode
Determining a frequency and the derivative quantities RPM and velocity is based on the combination of
event counting and time measurement. In other words, during a sampling interval, the number of events
occurring as well as the time interval between the first and last event are measured:
frequency
speed
RPM
The frequency is determined as the number of events counted divided by the time between the first and
the last "complete" event in the interval. An event is complete when a positive edge is succeeded by a
subsequent positive edge.
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