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