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Gossen Metrawatt MAVOWATT 4 Manual

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14 GMC-I Messtechnik GmbH
Example 1: Direct connection of the meter for single-phase AC systems
Selected nominal current range 5 A
Selected nominal voltage range 100 V
a) Function switch in position „ ”
Reading scale according to table 0 ... 500
Value read off the scale e.g. 350
Measured result: P = · c = 350 · 1= 350 W
b) Function switch in position „U ”
Reading scale according to table 0 ... 100
Value read off the scale e.g. 100
Measured result: U = · c
U
= 100 · 1
=100 V
c) Function switch in position „I ”
Reading scale according to table 0 ... 500
Value read off the scale e.g. 500
Measured result: I = · c
I
= 500 · 0.01
= 5 A
d) Function switch in position „cos 
ind”
Reading scale according to table cos
Value read off the scale e.g. 0.7
Measured result: cos = 0.7
Example 2: Meter connection for single-phase AC systems via current trans-
former
Switch positions, reading scale and read value same as in
example 1. But the current path is connected via a current trans-
former having a ratio of üI = 100 A / 5 A = 20.
Measured result: P = a · c · üI = 350 · 1· 20 = 7000 W
Example 3: Meter connection for single-phase AC systems via current and
voltage transformers
Switch positions, reading scale, read value and current transformer
same as in example 2. But the voltage path is connected via a volt-
age transformer having a ratio of üU = 1000 V / 100 V = 10.
Measured result: P = a · c · üI · üU = 350 · 1· 20 · 10 = 70000 W
… 14 …


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