IMC C SERIES User Manual page 43

Time Measurements
Exclusive measurement of time is performed as:
·
time (of two successive signal edges)
48
·
pulse time
49
Any other pulses occurring within the sampling interval are not evaluated for these measurement
types.
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
50
·
speed
50
·
RPM
50
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.
The frequencies must lie within the bandwidth of the module used. If the maximum frequency is
exceeded during a measurement, the system returns the input range end value instead of the true
measured values.
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(time from the beginning of one sampling interval until the next signal edge)
time
pulse time
imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19
Measurement types 43