[Amps] Time for New Power Meter

[Roger (K8RI)]

On 5/3/2015 8:16 PM, Al Kozakiewicz wrote:
> >From Bird's website: http://askbird.birdrf.com/afmmain.aspx?faqid=110
>
> Al
> AN2ZY
>
>
> To suggest +/- 125 Watts anywhere on the scale, for a 2500 Watt range, simply does not make sense and it would make a total mockery of the using the instrument as a power measuring device.

That it does.  IOW, when on the lower end of the display, you are looking at ridiculous accuracies of +/- 50%, or even more.  With the Bird the wide range of slug selection should let you measure near the top end of the scale for accuracy.


73

Roger (K8RI)

> 73, Alek.
> VK6APK
>
> On 4/05/2015 7:19 AM, Joe Subich, W4TV 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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