ZES ZIMMER LMG450, User Manual

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Z E S ZIMMER Electronic Systems GmbH Chapter 2
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2 General
The 4 Channel Power Meter LMG450 extends the ZES multimeter product range for power
measurement. It benefits from experience and know-how gained from the successful ZES
LMG90, LMG95 and LMG310 series.
Due to the high sampling rate which is used in this instrument, it is now possible to make
accurate power and efficiency measurements in 1 to 4 phase system configurations with a
variety of load and signal components containing frequencies in the precision range from DC to
20kHz.
Monitoring and storing transients, harmonic analysis as well as time domain views of signals’
waveform on the graphical display (oscilloscope mode) are all available with this instrument.
A special feature of the instrument is the simple, direct and intuitive topology of the operating
buttons. The display of different quantities and menus for setting up the instrument is normally
achieved with only a single touch of one button.
2.1 Features and application areas
Voltages and currents can be measured over a wide dynamic range. This makes the LMG450
instrument suitable for almost all professional measurement applications such as converter-fed
alternating current machines and power- and energy electronic applications. Various wire- and
phase configurations can be pre-selected to suit any required user application.
Another feature of the instrument is to suppress high frequency harmonics by means of
selectable filters. This makes it possible to take only the fundamental harmonics into account,
which build the torque and the mechanical power at the motor output.
Due to the exceptionally good common mode rejection of each current/voltage input channel it
is possible to measure currents and voltages which float up to 600V and at high frequencies
with respect to earth. This is particularly important for measurements in inverter- and rectifier
circuitry and in switched mode power supply applications.
The harmonics measuring mode (standard in the base instrument) permits the precompliance
measurement of high frequency harmonic reflections in networks according to IEC61000-3-2
standard.
The extended harmonic mode up to the 99
th
available as option provides to obtain the energy
distribution over different frequency ranges and can thus investigate their relative contribution
to the total consumption of energy.