Ultimately, the shown measurement methods are unsatisfactory compromises. For this reason, ZES ZIMMER has radically redesigned the signal conditioning and developed the DualPath architecture. The analog side corresponds to the conventional instruments, the subsequent digital processing, however, was revolutionized. The power analyzers of the LMG600 Series are the first power meters featuring two A / D converters in each of the two independent signal paths for current and voltage channel. A filter for the contact measurement of the broadband signal, and another for the narrowband signal at the output of anti-aliasing filter. By means of parallel processing of the digitized samples, the user has access to both measurements of the same signal without the risk of aliasing. This unique process eliminates all the disadvantages of previous approaches and guarantees accurate results in the shortest time. 

High sampling rate of up to 1.2 MS/s 

Calculation of RMS values with a minimum cycle time of 10 ms. 

Extremely high measurement accuracy of 0.015 % of the measured value + 0.01 % of the measuring range limit 

Complete data collection

In the wake of stricter monitoring of consumption and efficiency of electrical appliances, new standards and procedures (eg SPECpower_ssj2008, IEC 62301) will continuously be created to enable an objective comparison of the different manufacturers. Whether it is workstations, servers or appliances, is irrelevant to the principle: The long-term evaluation of the power consumption has always to take all relevant operating conditions into account. The differences between minimum load - e.g., Idle mode, - and full load can thereby be of considerable magnitude, which requires a very sophisticated means of measurement (see also Application Note No. 102, "Measurement of standby power and energy efficiency."). The measurements must be carried out over several hours and may not show any gaps. By selecting a sufficiently large measurement range, range changes and the inevitably resulting data losses can be avoided. The fundamental precision LMG600 also ensures an accurate measurement at the lower limit of a range.

Exact measurements thanks to minimal runtime differences

The fast switching semiconductors used to improve the efficiency of  modern frequency converters cause extremely steep voltage edges. The resulting capacitive currents affect the bearings and the motor insulation - this can lead to premature failure.
Motor filter (e.g. du / dt filter) attenuate the voltage gradient, but generate themselves power dissipation due to the settling of the filters' frequencies (typically > 100 kHz). The high bandwidth and the small time difference between the current and voltage of the LMG600 enable highly accurate power loss measurements on the filters at these frequencies, and longitudinal measurements with small cos φ. This also applies to power measurements at high bandwidths up to 10 MHz. This requires that the current and voltage channels must be designed for minimum delay differences; in the LMG600 it is less than 3 ns; this corresponds to 50 Hz at an angle error <1 μrad. The instrument is therefore ideally suited for the power loss measurement at small phase angles for transformers, inductors, capacitors and ultrasonic sensors. No options or adjustments are necessary, as the devices will fully meet this measurement task already in the default setting when shipped. For measurements on circuits of highest performance, typically current and voltage transducers are employed. The phase angle of the converter can be corrected via the runtime menu and thus the measurement accuracy can be improved.

Reliable even in areas with difficult electromagnetic conditions 

Particularly low earth capacitance of < 90 pF avoids interference by leakage currents 

12 months guaranteed calibration for low maintenance cost and optimum equipment availability

Free calibration protocol included at first delivery

All ZES ZIMMER power meters of the LMG series, the current sensors of PCT series and the voltage sensors of the HST series are carefully tested, adjusted and calibrated prior to shipment and are subject to strict quality controls.
ZES ZIMMER guarantees for a period of 24 months from first delivery that these products are free from defects in material or workmanship.

ZES Warranty Terms

Simultaneous measurement of I, V and P-variables and harmonics

Presentation in tabular or graphical form 

Wechselwirkungen zwischen Netz und Verbrauchern nach EN61000-4-15 

Direct access to high-resolution sample values and harmonics via interfaces 

Großflächiges und übersichtliches Farbdisplay, mit 10,1" und 1280x800 Pixeln

Flache Bedienhierarchie, rascher Zugang zu allen wichtigen Funktionen und Einstellungen

DVI-Ausgang für externen Monitor oder Beamer

Internal storage even of long-term measurements with the shortest cycle time, thanks to high-capacity mass-storage device

Optional additional internal SSD for mass storage of sample data over long time periods 

Display only what you really need in a way that helps you most to achieve the task at hand - as easy as 1-2-3:

• Arrange all relevant results on a single screen

• Mix graphical and numerical data to compose meaningful views

• Combine results from different channels and groups

• Enrich measured data with derived values

• Add your individual corporate touch by the use of logos and other graphical elements

LMG671 Prospect