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Analog multimeter Digital multimeter. A multimeter (also known as a volt-ohm-milliammeter, volt-ohmmeter or VOM) [1] is a measuring instrument that can measure multiple electrical properties. [2] [3] A typical multimeter can measure voltage, resistance, and current, [4] in which case can be used as a voltmeter, ohmmeter, and ammeter.
Portable digital multimeter 1979 Digital line earth loop impedance tester 1985 Microprocessor-based high current test set 1989 Battery impedance test equipment (BITE) 1990 Automatic 10kV insulation power factor test set 1990 Microprocessor-based protective relay test set 1994 DSP-driven watthour meter test set 1996
A digital clamp meter A multimeter with built-in clamp. Pushing the large button at the bottom opens the lower jaw of the clamp, allowing the clamp to be placed around a conductor. An electrical meter with integral AC current clamp is known as a clamp meter, clamp-on ammeter, tong tester, or colloquially as an amp clamp.
Pomona Electronics is a company specializing in electronic test equipment and accessories. It was founded in 1951 by Joseph J. and Carl W. Musarra, who were brothers. [7] [8] Founded to manufacture test cable harnesses for examining television cathode-ray tubes. [9] the company started in a factory location around the size of a living room. [9]
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If emission is at 70%, transconductance can be at 90% still, and gain at 100%. The best and most popular version used by the German army was the Funke W19 [citation needed]. The disadvantage of an emission tester is that it can test a good tube as bad, and a bad tube as good, because it ignores other properties of the tube. A tube with low ...
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Insulation testers that relied on a hand cranked generator operated on the same principle. This ensured that the indication was wholly independent of the voltage actually produced. Subsequent designs of ohmmeter provided a small battery to apply a voltage to a resistance via a galvanometer to measure the current through the resistance (battery ...
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