A digital multimeter, or DMM, measures and verifies multiple electrical quantities, including voltage, current and resistance. It’s a daily diagnostic tool used by technicians and electrical engineers and combines the features of a voltmeter, ammeter and ohmmeter. A digital multimeter typically includes probes, clamps or leads, which are inserted into inputs on the instrument and then connected to the device under test to make a measurement.


A clamp meter is an electrical test tool that combines a basic digital multimeter with a current sensor.

Clamps measure current. Probes measure voltage. Having a hinged jaw integrated into an electrical meter allows technicians to clamp the jaws around a wire, cable or other conductor at any point in an electrical system, then measure current in that circuit without disconnecting/deenergizing it.

Beneath their plastic moldings, hard jaws consist of ferrite iron and are engineered to detect, concentrate and measure the magnetic field being generated by current as it flows through a conductor.

Originally created as a single-purpose test tool, modern clamp meters offer more measurement functions, greater accuracy and in some cases specialized measurement features. Today’s clamp meters include most of the basic functions of a digital multimeter (DMM), such as the ability to measure voltage, continuity and resistance.


AC power supplies are used in supplying alternating current to an electronic device. They transform AC power from the mains power supply or power storage device to an AC power acquiring the right voltage, frequency, current, and form needed by the load. The input of the AC power supply may be AC or DC power.


A DC power supply provides direct current (DC) voltage to power a device under test such as a circuit board or electronic product. A DC power supply typically sits on an engineer’s work area or bench and is often referred to as a bench power supply.


An ohmmeter is an electrical instrument that measures electrical resistance (the opposition offered by a circuit or component to the flow of electric current). Multimeters also function as ohmmeters when in resistance-measuring mode. An ohmmeter applies current to the circuit or component whose resistance is to be measured. It then measures the resulting voltage and calculates the resistance using Ohm’s law.


A megohmmeter, or megger as it is more commonly known, is an electrical test instrument designed to test extremely high resistances by producing a DC (direct current) voltage of between 300 and 15,000 volts. A megohmmeter produces a high voltage, low current DC charge which allows for testing resistances commonly encountered in electric motor winding or cable insulation tests. Megohmmeters produce this high voltage via battery powered internal circuitry or a manually operated generator.


Testing electrical equipment, machinery, or installations for winding, ground, or insulation resistance with a regular ohmmeter may not be accurately achieved due to the extremely high resistances common in these applications. Resistances in these cases may range from several megohms to several million megohms and require a test voltage far higher than that utilized by smaller ohmmeters. A megohmmeter uses DC voltages ranging from 300 to 15,000 volts to accurately measure these very high resistance values. These voltages are supplied at very low current ratings and are typically not dangerous to the megohmmeter user.


An insulation tester performs the basic measuring function a megohmmeter does—measuring very high resistance values by sending a high voltage signal into the object being tested—and it often does much more; it usually performs more functions, including more complex testing and recording of measurements.


Phase Rotation Indicator is a portable handheld instrument designed to detect the rotary field of three-phase systems. With three test leads, this rugged tester easily determines a clockwise or counterclockwise direction.


A power analyzer is an instrument that measures and quantifies the rate of power flow in electrical systems. Power flow is expressed in Joules/second (J/s) or kilowatt-per-hour (kW/h). Electrical power is the rate per unit of time that electrical energy is transferred in an electrical system between two points.


Multifunction calibrators are designed to source and measure electrical signals such as voltage, current, resistance, and frequency, and pulses so as to verify the accuracy of sensors and measuring instruments. With options they can also measure/source pressure.
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Multi-product calibrators are all-in-one solutions for calibration of all different types of electric meters. Benchtop calibrators provide very high accuracy for use in laboratory, portable ones versatility for use on site.


An LCR meter (Inductance (l), Capacitance (C), and Resistance (R)) is an instrument used to measure the inductance, capacitance, and resistance of a component, sensor or another device that’s operation depends upon capacitance, inductance or resistance.
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An oscilloscope, formerly known as an oscillograph (informally scope, oscope, or o-scope), is an instrument that graphically displays electrical signals and shows how those signals change over time. It measures these signals by connecting with a sensor, which is a device that creates an electrical signal in response to physical stimuli like sound, light and heat.
Oscopes are often used when designing, manufacturing or repairing electronic equipment. Engineers use an oscilloscope to measure electrical phenomena and solve measurement challenges quickly and accurately to verify their designs or confirm that a sensor is working properly.

MECAL JSC. is proud to assure you of the services with our facilities and highly experienced personnel who are qualified and have done more than 1000 calibration projects. Our on-site services can also help avoid the risks when moving measurement instruments out of factories.

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