YSI IQ SensorNet DIQ/CR3 - Manual (Page 23)

MIQ/CR3; DIQ/CR3 Settings
4 - 9 ba76032e01 01/2012
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 4-10).
 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 4-11).
The maximum values for the pulse width or switching frequency are
assigned to the End value and the minimum values for turn-on duration
or frequency are assigned to the Start value.
Fig. 4-6 Positive characteristic curve
Fig. 4-7 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