User manual for meter with U/I input PD72S
a)
I
in
=10 mA and I
n
= 0.375
Accordingly to expression on page 35 for linear characteristic:
0.375 × [1200 - (- 300)]
≅
562 and next, the
“Lo C”
value is added to the result , so the
displayed value:
W
≅
562 + (-300) = 262
b)
I
in
= 2.5 mA and I
n
= -0.0938.
W
≅
-441.
c)
I
in
= 20.5 mA and I
n
= 1.0313.
W
≅
1247.
Example 4: The square characteristic
Let the input mode = 4-20 mA, and parameters
“Lo C”
and
“Hi C”
equal to -300 and 1200
respectively. The calculations will be done for there different input currents from example 2.
a)
I
in
=10 mA and I
n
= 0.375
Accordingly to expression on page 35 for linear characteristic:
(0.375)
2
× [1200 - (- 300)]
≅
211. and next, the
“Lo C”
value is added to the result , so
the displayed value:
W
≅
211 + (-300) = -89
b)
I
in
= 2.5 mA and I
n
= -0.0938.
W
≅
-287.
c)
I
in
= 20.5 mA and I
n
= 1.0313.
W
≅
1295.
Example 5: The square root characteristic
Let the input mode = 4-20 mA, and parameters
“Lo C”
and
“Hi C”
equal to -300 and 1200
respectively. The calculations will be done for there different input currents from example 2.
a)
I
in
=10 mA and I
n
= 0.375
Accordingly to expression on page 36 for linear characteristic:
sqrt (0.375) × [1200 - (- 300)]
≅
919.
and next, the
“Lo C”
value is added to the result , so the displayed value:
W
≅
919 + (-300) = 619
b)
I
in
= 2.5 mA and I
n
= -0.0938, normalized result is negative, so the displayed value is equal
to
“Lo C”
parameter: W
≅
“Lo C”
= -300.
c)
I
in
= 20.5 mA and I
n
= 1.0313.
W
≅
1223.
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