Power Quality Logger
Electrical Specifications
59
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 %
1 0.8
2
–
2 0.8
×
-------------------------
+
0.005 % PRange
×
+
±
=
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 % SRange
×
+
(
)
±
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 %
SHigh Range
×
0.015 %
1000 V
×
1500 A
×
225 W/VA/var
=
=
=
