I checked an resoldered everything that looked questionable, and it made no difference! I don't know would a fixed divider be sufficiently precise for mass production? Could it be that a calibration value is stored in the controller, and it got lost maybe? Then again I see no contacts for in circuit programming... On Fri, Dec 12, 2008 at 8:23 AM, Martin wrote: > Tobias Gogolin wrote: > > I have a P3 Kill-A-Watt, and i use it to see how much of my generator I > am > > using... > > I may have gone over the limit for a few times, but never for long, since > > the automatic fuses on my generator and the capacity of the Kill-A-Watt > are > > very compatible... > > I didn't see the loss of calibration till way after those times, and it > > appears it has some build in self calibration, in which the Voltage > displays > > first, but Amps and Wattage take longer to be available. > > > > Now The voltage comes out high (says 180 V when my DMM says 120V AC) , > and > > when current info becomes available it starts out at 1.4 Amps even if no > > load is connected... > > > > So how might this work, i checked an there appears to be nothing burned, > > everything looks new and clean! > > > > Could the Op Amp have taken a hit without showing signs? > > > > > > It could have, but sounds unlikely. It's a bit more likely that part of > the sensing circuit was damaged, like the divider it uses to measure the > voltage (which I assume is how it performs.) > > You can check for cracked solder joints and check resistor values if you > know they shouldn't be too high or too low. > > - > Martin > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- Tobias Gogolin Tel. Movistar (646) 124 32 82 Tel. Telcel (646) 160 58 99 skype: moontogo messenger: usertogo@hotmail.com You develop Sustainable Ranch Technology at http://tech.groups.yahoo.com/group/SURA-TECH an Open Source Electric Motor/Alternator at http://groups.yahoo.com/group/Performance_Axial_Flux and an Open Source Motor Controller at http://groups.yahoo.com/group/GoBox -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist