I may be late to this dance but isn't that why they sell more than one slug at
different power ratings? A 2500W slug could be off by +/- 125W, a 100W slug
would be off by +/-5W anywhere on the meter.
On Sun, 03 May 2015 19:19:41 -0400
"Joe Subich, W4TV" <lists@subich.com> wrote:
>
> > By Joe and Roger's interpretation, the reading anywhere on the scale
> > could be off by +/- 125 watts, even at very low readings. Do you
> > really think that is what Bird meant?
>
> Yes, that is *exactly* what Bird meant. The specifications in my
> Bird Model 43 Instruction Book say: "Accuracy - +/- 5% of Full Scale
> Power". If *your* interpretation were correct it would say "+/- 5%
> of indicated power" but it doesn't.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 2015-05-03 6:35 PM, Bill Turner wrote:
> > ------------ ORIGINAL MESSAGE ------------(may be snipped)
> >
> > On Sun, 03 May 2015 08:44:10 -0400, W4TV wrote:
> >
> >> No, Roger is correct. Bird's specification is 5% *of full scale*.
> >> That means the Bird's accuracy is +/- 125 Watts *anywhere* using a
> >> 2500 Watt element.
> >
> > REPLY:
> >
> > Total nonsense. Manufacture re specify "full scale accuracy" only
> > because they do not guarantee linearity and accuracy below full scale.
> > In other words, the accuracy is guaranteed only at full scale and
> > nowhere else.
> >
> > By Joe and Roger's interpretation, the reading anywhere on the scale
> > could be off by +/- 125 watts, even at very low readings. Do you
> > really think that is what Bird meant? A reading of 10 watts could be
> > off by +/- 125 watts? Or a reading of 125 watts could actually be
> > zero?
> >
> > 73, Bill W6WRT
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> >
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--
R. Kevin Stover
AC0H
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