[Amps] Time for New Power Meter

[Joe Subich, W4TV]

 > 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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