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AC Amps measurements

 
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Frank
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PostPosted: Sat Apr 21, 2007 8:52 pm    Post subject: AC Amps measurements Reply with quote

I found this old tranformer from an old tube tv, is 120v input and about 140v output, so i can build myself an Isolation Transformer,and i'm trying to know how many amps does it put out, i already blew a fuse out by measuring the same way we measure volts with the AC A setting in the meter 88V, is there another way to measure amps , i never studed it deeply because never had to use the amps side, do i have to use some resistor in series with it,can some one please explain it to me but not so technicaly speaking. thanks guys
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RODALCO



Joined: 28 Oct 2006
Posts: 30
Location: Auckland - New Zealand

PostPosted: Sun Apr 29, 2007 9:27 am    Post subject: 120 Volts TX Reply with quote

Frank, What is your mains voltage in your country ? ( 110, 220 ?)

If you put 220 Volts on a 120 Volts TX, you are likely to blow a fuse and may damage the TX.

What is the fisical size of the TX core ?

You say the TX is from an old tube TV, what was the nameplate rating ?
That will give you an approx idea.

I would guess that it is something in the range from 100 VA to 300 VA.

You can draw about 1 to 2 Amps from it. Put a 200 Watt lamp in series as a resistor during testing, when not sure if a short is present.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sun Apr 29, 2007 7:39 pm    Post subject: Reply with quote

http://www.kilowattclassroom.com/Archive/AN0006.pdf
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PostPosted: Sun Apr 29, 2007 10:03 pm    Post subject: Reply with quote

Frank, What is your mains voltage in your country ? ( 110, 220 ?)

If you put 220 Volts on a 120 Volts TX, you are likely to blow a fuse and may damage the TX.

What is the fisical size of the TX core ?

You say the TX is from an old tube TV, what was the nameplate rating ?
That will give you an approx idea.



Thanks for your help. I 'm in USA, V 110, the size is the size of a 300w that i have but is a step down TX 220 to 110,
it has no imfo, no plate nothing,
i have built myself a SSPL (Simple Series Power Limiter}and have a 200w bulb , i'll try that. Thanks in advance.
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