DIY-WB accuracy of A/R readings

[Bruce]

The output isn't linear in nature.  Just a characteristic of the beast.
Within just the last few days Mark posted it matched his Horiba (I think
that's what his other WB is).
It not a lab grade devise, so it's not perfect, and was never meant to be.
It was mean to be affordable, and it's output repeatable.
Bruce


From: Hugh Keir
Subject: DIY-WB accuracy of A/R readings
I have also been looking at formulas that will allow the A/R to be
calculated, but I have a question over the accuracy of the readings
presented at ftp://diy-efi.org/pub/diy_efi/project_files/diy_wb1/v_out.txt
As a start, I looked at how regular the increases in A/R were and I noticed
a bit of a wobble at A/R 14.4. but the readings are generally meandering
about.
I hope the output from my spreadsheet makes sense.
Can we re-confirm these readings as my gut feeling is there should be a
steady progression in the numbers.
No point in presenting formulas for inaccurate readings
Hugh
Difference betweenDifferences between
VoltsA/RA/R readingsthe differences
1.40 10.08 0.15 0.00
1.45 10.23 0.15 -0.00
1.50 10.38 0.15 0.01
1.55 10.53 0.16 0.01
1.60 10.69 0.17 0.00
1.65 10.86 0.17 0.00
1.70 11.03 0.17 0.01
1.75 11.20 0.18 0.01
1.80 11.38 0.19 0.00
1.85 11.57 0.19 0.01
1.90 11.76 0.20 0.01
1.95 11.96 0.21 0.00
2.00 12.17 0.21 0.01
2.05 12.38 0.22 0.01
2.10 12.60 0.23 0.01
2.15 12.83 0.24 0.00
2.20 13.07 0.24 0.02
2.25 13.31 0.26 0.01
2.30 13.57 0.27 0.00
2.35 13.84 0.27 0.02
2.40 14.11 0.29 0.01
2.45 14.40 0.30 0.25
2.50 14.70 0.55 0.04
2.55 15.25 0.59 0.05
2.60 15.84 0.64 0.06
2.65 16.48 0.70 0.05
2.70 17.18 0.75 0.08
2.75 17.93 0.83 0.07
2.80 18.76 0.90 0.10
2.85 19.66 1.00
2.90 20.66

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