117
11.2.2 Accuracy at the Computation
(1) Scaling
The accuracy rating at the scaling is shown as the following formula.
Scaling accuracy (digits) =
[Range accuracy rating (digits) x Scaling 2 digits]
But, Scaling factor =
(Example 1) When VOLT range is 1.000 to 1.000V and Scaling range is 0.00 to 100.00.
Range accuracy rating =0.1 % x 1.000 V + 3 digits
(Input +1.000 V) =4 digits
Scaling factor
=
=5
Therefore, Scaling accuracy =
（
4 x 5 + 2
）
= 22 digits
Analog recording accuracy =
4+{1000 ( 1000)} x
= 10 digits
= 0.01 V
(Example 2) When Type K is 0.0 to 200.0
and Scaling is 0.00 to 200.00.
Range accuracy rating
=0.15 % x 200.0+0.3
(Input 200
)
=0.6
=6 digits
Scaling factor
=
=10
Therefore, Scaling accuracy = (6 x 10 + 2)
= 62 digits
= 0.62
(2) Square Root Computation
The square root computation is shown as the following formula.
Display value= 10 Process variable
Display value accuracy rating:
Process variable accuracy: e
Process variable: x (converting into %).
Display value
=10
x e
10 x
Therefore, Display value accuracy
=
10000 0
1000
（
1000
）
0.3
100
20000 0
2000 0
10e
2 x
5e
x
Scaling span (digits)
Measurement range span (digits)
Содержание HR-700
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