Eaton IQ 150S, User & Installation Manual

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IM02601006E www.eaton.com 7-17
IQ 150S/250S 7: Using the Submeter
7.4: Performing Watt-Hour Accuracy Testing (Verification)
To be certified for revenue metering, power providers and utility companies must
verify that the billing energy meter performs to the stated accuracy. To confirm the meter’s perfor-
mance and calibration, power providers use field test standards to ensure that the unit’s energy
measurements are correct. Since the IQ 150S/250S submeter is a traceable revenue meter, it
contains a utility grade test pulse that can be used to gate an accuracy standard. This is an essen-
tial feature required of all billing grade meters.
• Refer to Figure 7.5 for an example of how this process works.
• Refer to Table 7.1 for the Wh/Pulse constants for accuracy testing.
Figure 7.4: Watt-hour Test Pulse
0000
-
-
-
A
B
C
MENU ENTER
MAX
MIN
LM1
LM2
PRG
VOLTS L-N
VOLTS L-L
AMPS
WNARP
VA/Hz
Wh
VARh
VAh
120%-
90%-
60%-
30%-
%LOAD
MEGA
KILO
Wh Pulse
Watt-hour
Test Pulse