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1736/1738
Users Manual
2
1 PF
–
Formula 1:
0.5
+
------------------------ -
% +0.005 %
×
PF
3
2
1 PF
–
Formula 2:
1.2
+
------------------------ -
% +0.005 %
×
PF
2
2
1 PF
–
Formula 3:
1.2
+
------------------------ -
% +0.0075 %
×
PF
2
2
1 PF
–
Formula 4:
1.7
+
------------------------ -
% +0.0075 %
×
PF
2
2
1 PF
–
Formula 5:
×
------------------------ -
1.2
+
1.7
% +0.005 %
PF
Example:
Measurement at 120 V/16 A using an iFlex1500-12 in low range. Power Factor is 0.8
σ
Active power uncertainty
P
σ
2
–
1 0.8
±
=
1.2 %
+
------------------------ -
+
0.005 %
P
×
2
0.8
The uncertainty in W is
±
(
1.575 %
σ
Apparent power uncertainty
σ
±
(
×
)
=
1.2 %
+
0.005 %
S
=
S
Range
The uncertainty in VA is
±
(
1.2 %
Reactive/non-active power uncertainty
σ
×
×
±
(
)
±
(
Q
=
2.5 %
S
=
2.5 %
120 V
In case of a measured voltage that is >250 V, the additional error is calculated with:
×
Adder
=
0.015 %
S
=
0.015 %
High Range
74
1.800.561.8187
1.800.561.8187
:
×
×
±
(
P Range
=
1.575 %
+
0.005 %
1000 V
×
×
×
)
±
120 V
16 A
0.8
+
7.5 W
=
31.7
W
:
S
±
(
×
×
)
±
(
1.2 %
+
0.005 % 1000 V
150 A
=
1.2 %
×
×
120 V
16 A
+
7.5VA
)
=
±
30.54 VA
σ
:
Q
×
)
±
16 A
=
48 var
×
×
1000 V
1500 A
=
225 W/VA/var
www.
www.
×
)
±
(
)
150 A
=
1.575 %
+
7.5 W
)
+
7.5 VA
.com
.com
information@itm.com
information@itm.com
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