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The hand-driven generator is of the permanent magnet type and it is designed to generate from 500 to 2500 volts. Testing voltage is produced by the rotation of the crank in a hand-operated megger, or by the battery in the case of an electronic-type megger. For testing a range up to 440V, equipment requires 550V DC is sufficient.
The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand. It was affectionately known as the "pepper grinder" or "peppermill" due to its shape and means of operation; its superficial resemblance to a certain type of hand ...
The Mk 18 Mod 0 was a 40x46mm grenade launcher used by the United States Navy during the Vietnam War and also the last known hand crank operated firearm since the Gatling gun. It was replaced by the Mk 19 grenade launcher in service with the United States Armed Forces .
[4] [5] One of them was for a "hand dynamo", [6] which allowed the generation of voltages high enough to measure resistance in the megohm range and facilitated the construction of the first portable insulation tester. The Megaohm Meter was then named the Megger, and the word became a trademark name, registered on 25 May 1903. [7]
Hand-held meters use batteries, while bench meters usually use mains power; either arrangement allows the meter to test devices. Testing often requires that the component under test be isolated from the circuit in which they are mounted, as otherwise stray or leakage current paths may distort measurements.
According to F. Lisheng and T. Qingjun, the hand-crank of the rotary quern was different from a crank, which was the combination of a hand-crank and a push-and-pull connecting rod by a hinge. [ 7 ] The Antikythera mechanism, dated to around 200 BC, [ 25 ] [ 26 ] used a crank as a part of its mechanism. [ 27 ]
Crank powered flashlights often have radios and other features. One popular feature is a 5-volt USB charging port for recharging cell phones when an outlet is not available. The quality and long-term reliability of these devices vary over a wide range, from high-reliability mil-spec emergency equipment down to one-time-use non-repairable ...
An EMF meter is a scientific instrument for measuring electromagnetic fields (abbreviated as EMF). Most meters measure the electromagnetic radiation flux density (DC fields) or the change in an electromagnetic field over time (AC fields), essentially the same as a radio antenna, but with quite different detection characteristics.
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