Atec Zimmer-Electronic-Systems-LMG95 - Manual (Page 2)

The LMG95 single-phase precision power meter is an
outstanding product in the LMG Series of proven
ZES ZIMMER precision power measuring devices.
Highly accurate continuous and gap-free signal
measurement and processing, ergonomic operation and
presentation of the results, interfaces with high data
rates for efficient system applications – these are the
performance features which distinguish the LMG95.
LMG95. Precise. Direct. All Waveforms. Transparency Throug
The high precision power measurements on components
and devices wanted in development, quality
assurance and manufacturing can be performed
with ease – independent of whether or not the current
and voltage are sinusoidal or distorted, whether the
load is linear or not, or whether the circuit works in a
chopped, pulsed mode or in a modulation mode.
Extended possibilities of synchronisation on the
periodicity of the signal measured always produce
distinct and stable measurement displays and results.
All Waveforms
Direct Up to 600V and 20A
Isolated measurement inputs with direct measurements
ranges up to 600V (1600V
peak ) and 20A (960A peak for
the measurement of inrush currents) and the input for
current measurements using a shunt or other transducer
measure the incoming measurement signals exactly and
without any aberrations.
0.03% Accuracy
With a basic accuracy of 0.03%, this is the most
precise instrument in its class and it is therefore used
as a reference device for power meters, power
measurement transformers and trms-meters for
current and voltage.
Harmonics and Flicker in Full
Compliance With EN61000-3-2/-3
The harmonic analysis in full compliance with the
EN61000-3-2 standard is already available in the basic
unit. The flicker meter in compliance with EN61000-4-15
for the measurement of flicker (voltage variations) is
available as an option. These two functions consider-
ably extend the possible applications of the LMG95 in
the laboratory area as well. If suitable stable voltage
sources are available, tests for CE compliance can be
performed in accordance with EN61000-3-2/-3.
Analysers in CE Test Systems
The LMG95 is used
as an analyser in
CE test systems to
test electrical de-
vices on harmonics
and flicker and
their effect on
mains – for example
it is used in the ZES
ZIMMER SYS61K
test system shown
in the adjacent
illustration.
In 3-phase applica-
tions three LMG95
units are used.
Charging current of a switching power
supply
Phase-angle control
PWM frequency inverter
Waveform of
charging current
Amplitude spectrum of the current
harmonics with CE evaluation in
accordance with Class A
Waveform of
current
Table of the current harmonics with
limits in accordance with Class A
Line voltage
against artificial
midpoint
Measurement of the amplitude spec-
trum of the voltage harmonics in the
HRM100 mode. An increase in the 47
th
and 49 th , the frequency of the funda-
mental amounts to fn/47=26.25Hz