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CURRENT TRANSFORMERS
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To: tesla-at-grendel.objinc-dot-com
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Subject: CURRENT TRANSFORMERS
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From: jim.oliver-at-welcom.gen.nz (Jim Oliver)
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Date: Tue, 11 Apr 1995 07:43:00 GMT
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>Received: from st-james-dot-comp.vuw.ac.nz by ns-1.csn-dot-net with SMTP id AA06458 (5.65c/IDA-1.4.4 for <tesla-at-grendel.objinc-dot-com>); Tue, 11 Apr 1995 15:25:54 -0600
TE>From: Esondrmn-at-aol-dot-com
TE>To: mark.graalman-at-mediccom.norden1-dot-com
TE>Subject: Current transformers
TE>Mark Graalman
TE>You are correct, air wound pick up coils do not work. Last night I tried
TE>using a coil out of a large solenoid. It is wound with small wire, like #30
TE>awg, thousands of turns on a plastic form. I passed the main RF ground wire
TE>from the secondary through the center. Running the coil at half power, I
TE>could not measure any AC voltage on my meter. I built a full wave diode
TE>bridge and put a .005 mfd capacitor across the outputs. I could see the vol
TE>meter just barley move on the lowest DC voltage scale. I switched the meter
TE>to the 25 microamp current scale and could measure a couple of microamps
TE>which did change as I varied the power input to the coil, but not much.
TE>I hauled all my old televisions to the dump years ago. I guess I will have
TE>to call some TV repair shops and see if I can find an old flyback
TE>transformer.
TE>Ed Sonderman
Ok. I have done this with air wound coils as I said before. BUT I
reckon I must have had an amount of 50 Hz component in the RF. In
those days I wasn't using any proper grounding system. so I was
tuning to 50 Hz rather tha true RF.
As I said before: some strange things happened and the exercise
wasn't all that useful for tuning, but it might be a good
indicator of mains component. (In New Zealand we use 50 Hz)
Jim Oliver <jim.oliver-at-welcom.gen.nz> (3:771/370)
* SLMR 2.1a * "I am Homer of Borg! Prepare to be ..OOoooo ! Donuts !!!"