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)
Scaling factor
Therefore, Scaling accuracy
Analog recording accuracy
Example 2) When Type K is 0.0～200.0℃ and Scaling is 0.00～200.00.
Range accuracy rating ＝0.15%×200.0＋0.3℃
(Input 200℃)
Scaling factor
Therefore, Scaling accuracy

(2) Square Root Computation

The square root computation is as following formula.
＝ 10
Display value
Display value accuracy rating:
Process variable: x (convert into %).
＝ 10
Display value
Therefore, Display value accuracy
Scaling span (digits)
Measurement range span (digits)
＝ 4 digits
10000－0
＝
1000－（－1000）
＝ ±(4×5＋2)
＝ ±22 digits
＝ ± 4＋｛1000－（－1000）｝×
＝ ±10 digits
＝ ±0.01V
＝0.6℃
＝6 digits
20000－0
＝ ＝10
2000－0
＝±（6×10＋2）
＝±62 digits
＝±0.62℃
Process variable
ε
, Process variable accuracy: e, and
≒ 10
x±e x
5e
ε
＝
x
―114―
＝5
0.3
100
10e
±
2 x
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