I used a digital voltmeter attached to the batteries to calibrate my LR3Cs.  I called Concorde and got the voltage, don't remember now exactly what they told me.  My JPI EDM 900 was off by a few tenths of a volt.  The JPI takes its reading off the main buss and my batteries are 15 feet away.  So the moral of the story, use an accurate voltmeter attached to the battery to set the charging voltage.

 

Mike Easley

Colorado Springs