The Accuracy At The Computation; Scaling; Square Root Computation - Toho Electronics TRM-10C Instruction Manual

11.2.2 The Accuracy at the Computation

(1) Scaling

The accuracy rating at the scaling is as following formula.
Scaling accuracy (digits) ＝ Range accuracy rating (digits) × Scaling factor ＋2 digits
But, Scaling factor＝
Example 1）When VOLT range is －1.000～1.000V and Scaling range is 0.00～100.00.
Range accuracy rating ＝0.1%×1.000V＋3 digits
(Input +1.000V) ＝4 digits
Scaling factor
Therefore, Scaling accuracy
Analog recording accuracy ＝± 4＋｛1000－（－1000）｝×
Example 2）When Type K is 0.0～200.0℃ and Scaling is 0.00～200.00.
Range accuracy rating
（Input 200℃）
Scaling factor＝
Therefore, Scaling accuracy

(2) Square root computation

The square root computation is as following formula.
Display value＝10
Display value accuracy rating:ε, Process variable accuracy: e, and
Process variable: x (convert into %).
＝10
Display value
Therefore, Display value accuracyεε＝
Scaling span (digits)
Measurement range span (digits)
10000－0
＝
1000－（－1000）
＝±（4×5＋2）
＝±22 digits
＝±10 digits
＝±0.01V
＝0.15%×200.0＋0.3℃
＝0.6℃
＝6 digits
20000－0
＝10
2000－0
＝±（6×10＋2）
＝±62 digits
＝±0.62℃
Process variable
≒ x ±
x±e 10
5e
―124―
＝5
0.3
100
10e
2 x
x
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