174 Virtual Channels
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
Data types:
4.10.55 Schmitt-Trigger
Upper signal value which releases trigger
Lower signal value which releases trigger
Description: A Schmitt-trigger with an upper and a lower threshold. The function generates ideal, square
pulses. The only two possible return values are 0 and 1. The function can be used to reconstruct noisy
signals for the purpose of subsequent processing, eliminating the noise. However, the shape of the
original signal is also lost. The greater the distance between the two threshold values, the less
susceptible the Schmitt-trigger is to noise.
The function uses the following algorithm:
For a non-negative scaling factor, the first return value is 1, otherwise 0.
If the last return value was 0, the new return value is 1 if the signal's sample value exceeds the upper
threshold; otherwise, it is 0.
If the last return value was 1, the new return value is 0 if the signal's sample value drops below the lower
threshold; otherwise, it is 1.
Both of these steps are performed on each sample value in the input channel.
Notes: The upper and lower limit must both be specified in terms of the input signal's physical units.
The upper limit's value must be greater than that of the lower limit.
A Schmitt-trigger is useful in cases where the important aspects of a sequence of pulses are the amount
of pulses and their relative positions, but not their exact shape.
Data types:
4.10.56 Short circuit status (only for BRIDGE2 and UNI8 modules)
Data rate of result channel
Channel containing short-circuit status
Description: Outputs short-circuit status of module at specified sampling rate. Result is 1 in case of short
circuit, else 0.
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