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ITC 450/470
User manual
10.1.3. Square root characteristic
The normalized result is rooted and further conversion is done as for linear characteristic. Conversion is made
accordingly with the expression:
where W means the displayed value.
Showed above expression is not valid when normalized result is negative. It is possible for 4-20 mode
only. In this case (In<0) the displayed result is equal "Lo C" (see graphs below).
0
Figure. 10.3 Normal („Lo C" < "Hi C) and inverted („Lo C" > "Hi C) characteristic
10.1.4. User defined characteristic
User defined characteristic is defined as set of X-Y points. Number of the points is variable and may be set
from 2 to 20 points which make linear segments (see graph and see Menu "inPt"). Due to the normalized
result I
, the device computes specific segment, e.g. for characteristic from figure below, and I
n
segment between points X = "50.0." and X = "70.0." will be chosen.
Let's mark those points as PL (point low) i PH (point high) - in this example PL= "50.0," and PH = "70.0.", and
the normalized result I
calculated accordingly to the expression:
where Y(PH), X(PH), Y(PL), X(PL) mean values of X and Y coordinates of PH i PL points.
If the normalized result exceeds the user defined characteristic values, then specific utmost segment,
defined by two next points, is used for calculations. If characteristic from figure below is used, and if
I
>1 then segment defined by points X(PL) = "90.0.", X(PH) = "100.0." will be used.
n
I
4
8
12
16
20
Input current [mA]
for the point PL as I
n
p
Y
I
n
p
X
0
4
(in this example I
= I
p
n
Y
X
,
8
12
16
20
Input current [mA]
(PL) = 0,5). The displayed result is
Y
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= 0,65 the
n
40
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