Operation Manual

GMC-I Messtechnik GmbH 15
4.4 Internal consumption of the power meter and its influence on
the accuracy
The MAVOWATT 4 power meter needs a certain amount of energy for
the presentation of measured values. Due to the internal meter
consumption, the measured value always includes an error. In most
cases – particularly so when measuring higher power – the influence is
so small that it can be neglected.
When measuring smaller power (<100 W), it is recommended to
consider the internal consumption of the power meter by mathematical
correction of the measured result. Depending upon the connection
circuit, either the internal consumption of the current path or that of the
voltage path enters into the measurement.
See "Inputs" for the internal consumption of the power meter in chapter
5 „Specifications“.
L1
N
(L2)
L1
(2)
L2
(5)
L3
(8)
I
(3)
I*
(1)
The voltage path is connected
ahead of the current path
It follows:
a) the power output by the
energy source 
meter reading  internal
consumption of the voltage path
b) the power drawn by the
consumer 
meter reading internal
consumption of the current path
L1
N
(L2)
L1
(2)
L2
(5)
L3
(8)
I
(3)
I*
(1)
The voltage path is connected
behind the current path
It follows:
a) the power output by the
energy source 
meter reading internal
consumption of the voltage path
b) the power drawn by the
consumer 
meter reading internal
consumption of the voltage path