Datcon DT9000, Operating Instructions Manual

Page: 78 / 96

DT9000
78
20171205-V2
If you want the output to switch ON only once in the case
of the signal presented by the previous example, then set
the value of the hysteresis

higher than 0.
In practice the hysteresis value could be depend from two
aspects:
•
amplitude of the ripple or the measure of the drift on the
input signal
•
or when the user needs two different values to switch ON
and switch OFF not in relation the ripple or the drift. (This
is demonstrated by the example at the end of this chapter.)
In this example the value of the hysteresis (

)= 10.
How does it affect the switching of the output?
Example:
Hysteresis > 0
When the displayed value increases, the output does not
switch ON at 1000, only at the value 1000+10=1010.
After it has switched ON, and the signal begin to decrease,
it does not switch OFF as long as the value reaches the
value of 990 (1000-10).
It can be seen, that the difference between the switching
ON and OFF, that is the actual hysteresis, is equal with
twice the

parameter, that is 20.
It is also demonstrated that the hysteresis value of 10, that
is used in the example, has actually improved the situation:
the former number of switches, 4, has reduced to 2. If we
had selected a value twice as much, the result would have
been only one switching on.