LMG95REF Precision Reference Power Analyzer
The LMG95REF Precision Reference Power Analyzer is a high precision measuring instrument (uncertainty <100ppm) for current, voltage, active power and energy, also at very small power factors.
It is needed for calibration of precision power meters, energy counters etc.
The LMG95REF itself is calibrated by the PTB (Physikalisch Technische Bundesanstalt, the
national metrology institute of Germany) and stands therefore in highest position in the chain of traceability.

• Highest precision at power net frequency
  45..65Hz, measuring accuracy: +/- (33ppm of measuring value + 66ppm of measuring range)

• Measures voltage, current, inrush current,
  power, power factor, energy etc.

• DC to 50 kHz precision bandwidth,
  precise even at low cosphi <0.01

• Absolutely gap-free measuring process

• Harmonics and flicker measurement according to EN61000-3-2 and EN61000-3-3

• Harmonics and interharmonics up to the 99th harmonic resp. up to 99 interharmonics

• External shunt voltage input

• PC interfaces, memory-card slot

• Graphical monochrome display to show 4 to 8 measured values, wave form, diagrams of calculated values and bar charts

• Ergonomic user friendly interface

• Formula editor

• LabVIEW driver

Using the LMG95 with its excellent measuring accuracy as a base, ZES ZIMMER has designed
the LMG95REF with still more stable and precise measuring inputs. The accuracy and
the stability of the LMG95REF is guaranteed by:
• use of ultrastable and selected precision components
• very careful aging
• optimized heatsinks for temperature flow and cooling
• direct calibration at the national metrology institute PTB

This concept – going on in development of the running standard LMG95 while maintaining
the operating shell and interface software – gives a lot of advantages for the user.
By keeping the consistency in operation and software you can write and test all calibration
routines with a standard instrument. When higher calibration accuracy is needed, the standard LMG95 can then be replaced by the LMG95REF.
The improved measuring accuracy of LMG95REF is valid for all current and voltage measuring
ranges.

The LMG95REF is mainly used as standard in calibration systems.
This standard is traceable to PTB standards, so that a calibration system built up in this way provides calibration in compliance with ISO9000 with the measuring uncertainty of the LMG95REF (<100ppm).
In calibration systems stable sources with sinusoidal output signals at negligibly small distortion are needed. When calibrating power the voltage and current sources have to run on same frequency with settable phase angle.
This kind of sources you can get so far only at very high prices and with relatively low accuracy.
When using a LMG95REF, the accuracy of these sources may be specified quite low.
When building up a calibration system with LMG95REF as standard you can use for example
the FLUKE™ multi product calibrator 5500A with a stable output signal.
The 5500A is specified with a measuring uncertainty of maximum 0.25%.
But this is not relevant as the precision and traceability is guaranteed by the LMG95REF.
Without LMG95REF the calibrator 5500A is suitable for power meters of class 1, with LMG95REF the accuracy of the total system is significantly increased and the usable range of power factor remarkably enlarged.
With only two instruments and a PC you can build up a calibration system for power meter and energy counters at a very moderate price. Instruments of all brands can be calibrated.