How to wind a spring. Drawing, description

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How to wind a spring. Tips for the home master

Builder, home master

Using just two pieces of wood, a metal bar, a vise and a resilient steel wire, you can quickly make a spring. Its length depends on the number of revolutions around the bar, performed by a bunch of wooden bars, between which the free end of the wire is passed.

How to wind a spring

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New dedicated capacitance meter 09.01.2003

QuadTech specialists, formerly GenRad (USA), have developed a new capacitance meter Capacitance Meter 1930, which supplemented the 1900 series of professional immittance meters.

This device is optimized for automatic measurement of a wide range of parameters of capacitors of various types, including tantalum. The main advantage of the new device is its ability to measure small values (of the order of microohms) of the equivalent loss resistance in a series equivalent circuit (Equivalent Series Resistance - ESR). The basic error of the instrument is 0,1%. It allows you to measure a total of 20 parameters of capacitance (0,01 pF...10 F), resistance (0,1 μOhm...100 MΩ), inductance (0,001 nH...100 H), dielectric loss tangent, the quality factor of the phase angle, etc.

At the same time, its display can simultaneously display the values of any two measured values, including voltage and test current. The QT1930 meter can be set to any value of the test frequency in the range from 100 Hz to 100 kHz. The instrument can be programmed to take a sequence of six different measurements, each with its own settings.

Instrument functionality includes PASS/FAIL mode, load adjustment, constant voltage mode, voltage offset, source output impedance programming (5,25, 50, or 100 ohms), and setup memory. Up to 30 single and up to 10 group settings can be stored in the instrument's memory, each of which provides six consecutive measurements.

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