Calibrateur multifonctions CX 1651
Manuel de l'utilisateur 177
ACI uncertainty
range % value + % range
max. voltage [V]
2 mA – 20 mA 0.05 + 0.010
3
20 mA – 200 mA 0.05 + 0.005
3
200 mA - 2 A 0.05 + 0.005
3
2 A – 10 A 0.05 + 0.010
1.5
PHASE uncertainty
frequency range [Hz]
phase uncertainty d
ϕ
ϕϕ
ϕ
[
°
°°
°
]
40 – 200 0.15
200 – 400 0.25
AC POWER uncertainty
Uncertainty of AC power can be calculated from the following formula:
for active power d P = √ ( dU
2
+ dI
2
+ dPF
2
+ 0.03
2
) [%]
for reactive power d P = √ ( dU
2
+ dI
2
+ dPF*
2
+ 0.03
2
) [%]
for apparent power d P = √ ( dU
2
+ dI
2
+ 0.03
2
) [%]
where dP is uncertainty of power [%]
dU is uncertainty of set voltage [%]
dI is uncertainty of set current [%]
dPF is uncertainty of power factor (cosϕ) [%]
For calculation of dPF is valid following formula:
dPF = (1 – cos (ϕ+dϕ)/cos ϕ) * 100 [%]
where ϕ is set phase shift between voltage and current outputs
dϕ is uncertainty of set phase shift in table above
dPF* is uncertainty of of sinϕ [%]
For dPF* is valid following formula:
dPF* = (1 – sin (ϕ+dϕ)/sin ϕ) * 100 [%]
Example:
Set parameters: U = 100 V, I = 10 A, cos ϕ = 0.5, f = 50 Hz, displayed value of active power in W
Output voltage uncertainty: dU = 0.025 % value + 0.010 % range = 0.045 %
Output current uncertainty: dI = 0.10 % value + 0.03 % range = 0.7 %
Uncertainty due the set phase shift: PF 0.5 corresponds phase shift 60 °
dPF = (1 – cos (60+0.15)/cos 60) * 100 = (1 – 0.4977/0.5) * 100 = 0.45 %
Output power uncertainty: dP = √ ( 0.045
2
+ 0.7
2
+ 0.45
2
+ 0.03
2
) = 0.95 %
POWER FACTOR (PF)
range: -1.0 to +1.0
PF uncertainty can be calculated for any set value of output voltage, current and PF from following formula:
dPF = (1 – cos (ϕ+dϕ)/cos ϕ) * 100 [%]
where ϕ is set phase shift between voltage and current
dϕ is uncertainty of set phase shift form the above table
AC ENERGY uncertainty
It depends on set value of voltage, current, time and PF. The best uncertainty is 0.07% for apparent energy.
北京海洋兴业科技股份有限公司（证券代码：839145）
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