Re: [TCML] Calculating transformer output at lower voltages

[BrianB <brianb@xxxxxxxxxx>]

Jim/all,

I've seen the same thing as David when using a DVM but all worked as expected when I used an old analog meter...

Bottom line with transformer type NST's is the turns ratios are straight forward (ie. a 120vac 15kv unit will have ratio of 1:125). Figuring out the actual number of turns is much harder....

BrianB



On Jun 8, 2012, at 9:53 PM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:

> On 6/8/12 2:07 PM, David Speck wrote:
>> I'll second the motion --
>> 
>> A few years ago, I spent an afternoon trying to figure out the windings
>> of a transformer for a bandsaw blade welder. I was using a good Fluke
>> DVM, and getting inconsistent results that were just all over the place.
>> 
>> When I put a 1000 ohm power resistor across the meter probes, all the
>> readings fell into place and sanity was restored. I've found now that
>> Fluke even makes a low impedance meter with an input impedance of only
>> 3K ohms specifically for this purpose.
>> 
> 
> OH.. that might be it.. the huge inductance screws up the metering somehow (perhaps the autoranging?)
> 
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