Bob
Guest
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 Posted:
Sat Nov 12, 2005 5:42 am Post subject:
Re: Hey Phil, about transformers... |
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On Fri, 11 Nov 2005 16:45:10 +1100, "Phil Allison" <philallison@tpg.com.au>
wrote:
| Quote: |
"Bob"
When you say current waveform - do you have a current probe on your scope?
** All you need is a low value resistor ( 1 ohm or 0.1 ohm ) in series with
AC supply - preferably in the neutral.
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I was thinking of something like that... but we do have a clamp-on milliamp
probe I could try also.
| Quote: | Then a small isolation transformer with a 1:1 ratio (or close to that) to
feed the scope with the voltage across the resistor.
I actually use a more elaborate set up with a Hall effect sensor and 3.5
digit true rms amp meter, but started out with just a moving iron amp meter
and a transformer isolated current sense resistor.
BTW
You must have a Variac to get anywhere with transformer testing.
........ Phil
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I have a Variac, sometimes I use an old Heathkit multi tap power transformer to
get test voltages as well.
Thanks for all your help - you're a peach!
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