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200A portable digital micro-ohmmeter
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The MPK-204 high-current micro-ohmmeter is a truly portable, microprocessor-controlled instrument, used to accurately measure very low contact resistances of breakers and switches, busbars, transformer and motors winding and motors, etc, with test current from 1 mA to 200 A. It employs the Kelvin-type measurement to avoid measurement errors caused by test leads and their contact resistances. Readings are shown in the alphanumeric display with up to 4 ½ digits resolution. It allows to measure resistances up to 200 Ω, with a resolution down to 0,1 µΩ. Using its internal rechargeable battery, measurements with up to 10 A test current may be carried out without connecting the equipment to the main supply. Powered by the mains supply, it allows to measure with any test current up to 200 A.
Measurement accuracy is guaranteed by an state-of-the-arts signal amplification system, offset-free and of high long-term stability. For each test current the micro-ohmmeter has two scales, automatically eligible by the microprocessor in order to increase ten times reading resolution. Test current may be continuously adjusted by the operator in every one of the scales and their values are measured using an analogue indicator, making it easy to measure resistances with a significant inductive component, as in the case of big transformers windings.
It has a Serial output (RS-232) that may be connected to a printer, computer, or any data-logger to register measured values. The Hold function keeps in the display the measured value at a certain time-point, when the corresponding key is pressed.
The high-current generation system is based on modern technology that allows to significantly decrease both its weight (16 kg) and size. The cabinet is made of plastic material highly resistant to impacts and to environmental challenges. Internal thermal sensors in all sensitive components avoid any damaged caused to the instrument due to overheating.
This is a strong but lightweight equipment, and may be easily carried by one person. It is water-resistant and can be used under severe weather conditions offering an excellent performance working both in the laboratory and out in the field.