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Pump Sample Variance

post #1 of 3
Thread Starter 
Here is another little contribution in "SAMPLE VARIANCE".

Yes it exists and yet another reason you simply shouldn't expect multiple test beds to get the same results. Not only are there equipment differences, but simple things like samples of one pump can make a difference.



Cheers!
Martin
    
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post #2 of 3
18% difference in RPM...That's pretty significant, like really significant. It seems it really starts to show later on more so than earlier on.
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post #3 of 3
Thread Starter 
Yeah, I suspect it's just the readout moreso than the actual RPM. RPM is only approximate. I also found quite a difference in controller interpretation of RPM +-100 is not uncommon at all.

It's all good though, you just have to keep the big picture in mind and understand that test results are only good for relative information, same test bed, same parts.

Not all that different than silicone variance in processors. As much as we'd like it to be, it's not black and white..
    
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