Siemens 9700 kW Measurement Accuracy

kW Measurement Accuracy
The graphs below indicate the accuracy of the 9700 Power Meter’s kW
measurements at 25°C at Power Factor values of 1.0, 0.5 lead and 0.5 lag.
The graphs also compare 9700 Power Meter accuracy with the IEC 687 Class
0.5 specification.
% Reading
% Full Scale of Rated Load
Accuracy of kW Readings @ Unity PF @ 25°C
15
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
25 50 75 100 125
IncreasedAccuracy
7700ION Accuracy
IEC687 Class 0.5
10
% Reading
% Full Scale of Rated Load
Accuracy of kW Readings @ ± 0.5 PF @ 25°C
1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
25 50 75 100 125
IncreasedAccuracy
7700ION Accuracy
IEC687 Class 0.5
'%98-32
If the voltage on Phase A
drops to 20% or lower of
the rated nominal value,
frequency detection will not
function and measurement
accuracy will be impaired.