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1736/1738
Users Manual
74
Formula 1: % +0.005 %
Formula 2: % +0.005 %
Formula 3: % +0.0075 %
Formula 4: % +0.0075 %
Formula 5: % +0.005 %
Example:
Measurement at 120 V/16 A using an iFlex1500-12 in low range. Power Factor is 0.8
Active power uncertainty :
The uncertainty in W is
Apparent power uncertainty :
The uncertainty in VA is
Reactive/non-active power uncertainty :
In case of a measured voltage that is >250 V, the additional error is calculated with:
0.5
1 PF
2
–
3 PF×
-------------------------+
1.2
1 PF
2
–
2 PF×
-------------------------+
1.2
1 PF
2
–
2 PF×
-------------------------+
1.7
1 PF
2
–
2 PF×
-------------------------+
1.2 1.7
1 PF
2
–
PF
-------------------------
×+
σ
P
σ
P
1.2 %
10.8
2
–
20.8×
-------------------------+
0.005 % P
Range
×+
±= 1.575 % 0.005 % 1000 V× 150 A×+()± 1.575 % 7.5 W+()±==
1.575 % 120 V× 16 A× 0.8 7.5 W+×()± 31.7± W=
σ
S
σ
S
1.2 % 0.005 % S
Range
×+()± 1.2 % 0.005 % 1000 V× 150 A×+()± 1.2 % 7.5 VA+()±== =
1.2 % 120 V× 16 A 7.5VA+×()± 30.54 VA±=
σ
Q
σ
Q
2.5 % S×()± 2.5 % 120 V× 16 A×()± 48 var±== =
Adder 0.015 % S
High Range
× 0.015 % 1000 V× 1500 A× 225 W/VA/var== =
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