Principle of pulse stretching
The following figure uses examples to show if and how input pulses are changed.
3DUDPHWHUVIRUSXOVHVWUHWFKLQJ 7
3URFHVVHGLQSXW
VLJQDO
3URFHVVVLJQDO
7
IRUHGJHWR
7
IRUHGJHWR
3URFHVVHGLQSXW
VLJQDO
3XOVHLVVKRUWHUWKDQ7
DQGLV
VWUHWFKHGWR7
7KHVHFRQGSXOVHRFFXUULQJ
ZKLOHSXOVHVWUHWFKLQJLVWDNLQJ
SODFHZLOOEHGHOD\HGXQWLOWKH
DFWLYHSXOVHVWUHWFKLQJLV
FRPSOHWH
6KRUWSXOVHVWKDWRFFXU
GXULQJDQDFWLYHSXOVH
VWUHWFKLQJDUHLJQRUHG
3XOVHLVORQJHUWKDQ7
DQG
LVQRWFKDQJHG
3URFHVVVLJQDO
Figure 12-7
Principle of pulse stretching
Note
If you set a pulse extension for an input channel, this will also affect the flutter monitoring that
you enabled for this channel. The "pulse-extended" signal is the input signal for the flutter
monitoring. You should therefore match the parameter settings for pulse extension, and flutter
monitoring to one another. By selecting the appropriate values for the parameters you can
adjust the functions optimally to your process.
Digital electronic modules
12.6 Description of the parameters of the digital electronic modules
ET 200iSP
264
Operating Instructions, 11/2017, A5E00247483-07