DDM/1000V/10A/RES/HOLD/TRANSISTOR TEST/DIGITAL METER

SKU: MY60 Category: Tags: ,

DDM/1000V/10A/RES/HOLD/TRANSISTOR TEST/DIGITAL METER

DDM 1000V DIGITAL METER

Description

• Large LCD display
• Data hold
• Transistor tester
• Auto power off
• Low batt. indication
• °C / °F
(-20℃ - 1000℃)

AC Voltage:200mV - 750V
DC Voltage:200mV - 1000V
Diode Test:Yes
AC Current:20μA - 10A
DC Current:20μA - 10A
Resistance:200Ω - 20MΩ
Capacitance:2nF - 100μF
Frequency: -
Continuity Test:Yes

multimeter or a multitester, also known as a VOM (volt-ohm-milliammeter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter can measure voltagecurrent, and resistanceAnalog multimeters use a microammeter with a moving pointer to display readings. Digital multimeters (DMMDVOM) have a numeric display, and may also show a graphical bar representing the measured value. Digital multimeters are now far more common due to their lower cost and greater precision having obsoleted analog multimeters.

A multimeter can be a hand-held device useful for basic fault finding and field service work, or a bench instrument which can measure to a very high degree of accuracy. Multimeters are available in a wide range of features and prices. Cheap multimeters can cost less than US$10, while laboratory-grade models with certified calibration can cost more than US$5,000.

The first moving-pointer current-detecting device was the galvanometer in 1820. These were used to measure resistance and voltage by using a Wheatstone bridge, and comparing the unknown quantity to a reference voltage or resistance. While useful in the lab, the devices were very slow and impractical in the field. These galvanometers were bulky and delicate.

The D'Arsonval–Weston meter movement uses a moving coil which carries a pointer and rotates on pivots or a taut band ligament. The coil rotates in a permanent magnetic field and is restrained by fine spiral springs which also serve to carry current into the moving coil. It gives proportional measurement rather than just detection, and deflection is independent of the orientation of the meter. Instead of balancing a bridge, values could be directly read off the instrument's scale, which made measurement quick and easy.

The basic moving coil meter is suitable only for direct current measurements, usually in the range of 10 μA to 100 mA. It is easily adapted to read heavier currents by using shunts (resistances in parallel with the basic movement) or to read voltage using series resistances known as multipliers. To read alternating currents or voltages, a rectifier is needed. One of the earliest suitable rectifiers was the copper oxide rectifier developed and manufactured by Union Switch & Signal Company, Swissvale, Pennsylvania, later part of Westinghouse Brake and Signal Company, from 1927

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