Results in the time interval in seconds between two pseudo-boolean trigger pulses.

Interval Detector

Overview

This operator is used to measure the time between pulses in seconds. A pulse is represented by a positive trigger from ResetValue (False) to DetectionLevel (True), or the other way around.

The Interval Detector has two modes: Normal, which measures time between detects, or Dwell, which measures time between detect and reset.

Operator ports

Input S: Floating point values

Output T: Floating point values

Properties

Find more information about changing properties here: "Properties Viewer"

ResetLevel

type: Real value
The input level that resets the interval timer.

TriggerLevel

type: Real value
The input level that triggers the timer and sets the previous timer value to the output.

Dwell

type: True or False
Choose True to measure time between Detect and Reset, or False to measure time between Detects.

Select one of those presets:
True or False
True may also be read like 'yes' and false like 'no'

Caption

type: Word or phrase
The name of the object in the project. This name must not contain '.', '$' nor '@' characters.

For more information about the rules and usage of the Caption property, please refer to "Caption property - background and usage".

Documentation

type: See description
Optional documentation of this object. If this object is an operator, the Documentation text is displayed below the operator symbol.

Details

The difference in Normal and Dwell mode is best illustrated with following figures:
(In both cases the DetectionLevel is set to 1, and the ResetLevel is set to 0)

Normal mode: each time the Pulse signal changes from 0 to 1, a Detect is generated. The Interval Detector puts out the time in seconds between each detect.
Note that the first pulse leaves the Interval Detector 0, because the detector waits for the second pulse in order to calculate the time between them.

Dwell mode: the Interval Detector measures the time between the moment the Pulse signal goes from 0 to 1 and the moment it goes from 1 to 0 again. So, in effect the duration of the high value is calculated.

After a RESET action, the output of the Interval Detector will be reset to 0.

Note that for very slow rizing signals in a signal with a high sample frequency, the timing of the Detect and Reset pulses may be less precize, because the detect/reset signal level can deviate +/-0.0001%.