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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.
Ammeter, e.g. Galvanometer or Milliammeter (Measures current) Multimeter e.g., VOM (Volt-Ohm-Milliammeter) or DMM (Digital Multimeter) (Measures all of the above) LCR meter - inductance (L), capacitance (C) and resistance (R) meter (measure LCR values) The following are used for stimulus of the circuit under test: Power supplies; Signal generator
The Model EA113 was an excellent electronic multimeter, sold in the UK and abroad, in the same style as the Model 14 to 21 range. Avometer model numbers were first used by the company from 1936 (Avometer Model 7) and were used to distinguish designs with different ranges and functionality. Several "Models" were in production contemporaneously.
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, galvanometer and resistance all connected in series). The scale of the galvanometer was marked in ohms, because the fixed voltage from the battery assured that as resistance is ...
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An early D'Arsonval galvanometer showing magnet and rotating coil. A galvanometer is an electromechanical measuring instrument for electric current.Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.
Analog voltmeters move a pointer across a scale in proportion to the voltage measured and can be built from a galvanometer and series resistor. Meters using amplifiers can measure tiny voltages of microvolts or less. Digital voltmeters give a numerical display of voltage by use of an analog-to-digital converter.
AVOmeter model 9: Essentially similar to model 8 but with international symbols rather than letter markings for the DC and AC switches (Basic ranges to 10 A and 3000 V). 20,000 ohms/volt DC, 1000 ohms/volt AC. [22] (The features of the Models 8 and 9 were combined from the Model 8 Mark V of 1972, when the Model 9 was discontinued).
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