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# Re: [TCML] Determining a transformer's voltage and current

```On 4/20/16 4:27 PM, Ed wrote:
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```I strongly suggest a modification to this test, and that is to feed line
voltage into the secondary and measure the resulting primary voltage.
Safer and no chance of damaging the  voltmeter.
```
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I agree.. put your test voltage into the HV side and measure the LV side.

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It all kind of depends on what measuring equipment you have and what the transformer is.
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Usually, you'll put a test voltage that is *lower* than the rated voltage in (on either side).
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Unless you're looking to characterize saturation behavior, then you pretty much need to put your test voltage on the source winding, and figure out how to measure the output winding.
```

```
```
Ed

On 4/16/2016 2:52 PM, Kurt Schraner wrote:
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```There are just 2 fundamental tests, which allow the determination of
most importent transformer parameters: The open circuit test, and the
short circuit test. In Jim Lux' HV-book you find a nice description of

Regards, Kurt

-----Ursprüngliche Nachricht----- From: Brian Hall
Sent: Friday, April 15, 2016 8:44 PM
To: Tesla Coil Mailing List
Subject: [TCML] Determining a transformer's voltage and current

I posted a question similar to this a couple weeks ago, but it was a
bit cluttered or may have just gotten lost in the shuffle - there were
no replies.

To simplify:
Given a 120v 60Hz primary high voltage transformer (looks like it
could have come from a bug zapper or similar device), but there is no
plate or markings indicating the HV output voltage, current, or
manufacturer:

1) How could I determine the output voltage?
I got a cord and wire nuts, and hooked it up to 120v 60Hz AC to get a
max spark of 1.8mm between the sharp ends of two bolts. What is the
scale in mm for room temperature (20 degrees C) and still air on that
max spark gap?

2) How could I determine the output current?

I have a variac and some decent power resistors, if putting in say 10
or 20 volts on the primary side, then a resistive load on the hv side
would help along with Ohms Law for finding the current on the HV output.
Just wondering if anyone else has encountered this and already knows
how to find such answers, and has advice on how to determine with some
degree of accuracy the HV side voltage and current values of an
unmarked transformer.

----------------------------------
Brian Hall

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