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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: In lieu of a Hammond Series 193 choke . . . how to test this safely? posted by Christopher Witmer on April 27, 2007 at 17:28:42:
The Hammond choke has a nominal inductance of 5 henrys. The unit in your photo is rated as 8 millihenrys. This is 0.008 henry. The impedance at 60 Hz is given by the formulaZ = j*omega*L,
where j is the square-root of -1; omega is 2 times Pi times the frequency in Hz, and L is the inductance in henrys. The result for 0.008 henry is 3.0 ohms. The inductor would draw 40 amps of reactive current if plugged in to a 120 volt, 60 Hz AC circuit! Compare this to the 64 milliamperes drawn by a 5 henry choke: that is 0.064 amperes.
The name plate indicates the choke is designed for 8.5 amps DC. I don't know what it was used for, but it is not suitable as a replacement for the Hammond choke.
The AC reactor has even less inductance (0.000049 henry) and is rated for much more current. It would have been used in a large industrial power application. I don't think it is useful for domestic AC filtering.
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Follow Ups
- ***BE VERY CAREFUL*** - Al Sekela 21:48:41 04/27/07 (2)
- Consider the idea scrapped -- I'll use the right tool for the job - Christopher Witmer 23:56:17 04/27/07 (1)
- Re: Akihabara, main drag - grinagog 00:11:57 04/28/07 (0)
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