[Amps] transformers

[Tom W8JI]

> Well, I stated what I have used for measurement, and I 
> realize that the Bird
> and Nye Viking are not a Hewlett Packard.  I can accept 
> that both meters may
> be off by 10%, even though their accuracy is supposed to 
> be about half of
> that.

One thing I have learned doing RF measurements almost every 
day for 30 years or more is RF measurements are tougher to 
do than most imagine.

The accuracy of a Bird 43 meter, when properly calibrated 
and used, is + or - 5% of full scale anywhere on the scale. 
Since they do not manufacture a 1500 watt slug, the best we 
can rely on is + or - 125 watts at any power level with a 
properly calibrated 2500 watt slug. Many people would be 
surprised at how far off a new Bird 43 and slug combo can 
be.

I know of several manufacturers that had great difficulty 
making 1500 watts (measured by accurate means) with pairs of 
3-500Z's when only 100 watts of exciter power was available. 
HV had to be over 3500 volts.

73, Tom