YSI DIQ/S 182 XT-4-PR - Manual (Page 101)

System 182 XT-4 Relay outputs
6 - 11 ba76027e01 02/2012
Characteristic curves Through the selection of the Start value and End value, the proportional
output can be operated with a positive or negative characteristic curve.
 Positive characteristic curve:
Select the
End value to be greater than the Start value.
The turn-on duration or frequency increases with an increasing
measured value (see page 6-12).
 Negative characteristic curve:
Select the
End value to be smaller than the Start value.
The turn-on duration or frequency decreases with an increasing
measured value (see page 6-13).
The maximum values for the pulse width or switching frequency are
assigned to the End value value and the minimum values for turn-on
duration or frequency are assigned to the Start value value.
Fig. 6-6 Positive characteristic curve
Fig. 6-7 Negative characteristic curve
Measured value
Switching frequency f or
Pulse
v width
End value Start value
Max.
Min.
Measured value
Start value End value
Max.
Min.
Switching frequency f or
Pulse
v width