zainka
Full Member level 2
I am building a pH probe interface. Cant decide whether I should go for HW calibration or SW calibration.
What would give the most accurate result? I guess SW based is more versatile.
Have been looking at a few solutions out there like analog devices https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0326.pdf which uses SW calibration.
and this one which also is an SW calibrated example https://hex.ro/wp/blog/calibrating-the-ph-probe-using-the-mv-output-of-the-ph-circuit/
or the HW approach found here https://damien.douxchamps.net/elec/ph_meter/
and here https://www.sparkyswidgets.com/portfolio-item/ph-probe-interface/
Heres another one if your interested in these kind of stuff.
https://66pacific.com/ph/ph_8.htm
Some compensation like temperature compensating I guess is easier done by SW, but how about offset errors etc.
somethings tells me that HW calibration might be more accurate... but maybe it is the feeling of turning a knob until I am getting the wanted result that fools an old HW hearth...
What is your experience?
What would give the most accurate result? I guess SW based is more versatile.
Have been looking at a few solutions out there like analog devices https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0326.pdf which uses SW calibration.
and this one which also is an SW calibrated example https://hex.ro/wp/blog/calibrating-the-ph-probe-using-the-mv-output-of-the-ph-circuit/
or the HW approach found here https://damien.douxchamps.net/elec/ph_meter/
and here https://www.sparkyswidgets.com/portfolio-item/ph-probe-interface/
Heres another one if your interested in these kind of stuff.
https://66pacific.com/ph/ph_8.htm
Some compensation like temperature compensating I guess is easier done by SW, but how about offset errors etc.
somethings tells me that HW calibration might be more accurate... but maybe it is the feeling of turning a knob until I am getting the wanted result that fools an old HW hearth...
What is your experience?
