Hi, I have calibrated several Fluke 8840A DMM but have never seen one that needed the 100 or the 1000 VDC range calibrated. The instructions I have do not say anything about calibration constants for these ranges. I have changed the 100X voltage devider but that did not help. 10 VDC reads 9.9997 10 VDC on the 100 scale reads 9.985 100 VDC reads 99.915 on 100 scale and 99.81 on the 1000 scale. 1 VDC on the 10 scale reads 0.9999 The 100 to 1 dividers are about 99.995 and 99.997 to one. The 99.997 divider is in the unit now. What did I not do to get this to work. There must be a step someplace to do a math cal on the 100 to 1 divider. Thanks you... . -- John Phillips

John, I do not know what these "instructions" you have are, but the 8840A manual (http://assets.fluke.com/manuals/8840A___imeng0300.pdf), pp. 112 - 114, describes the calibration procedure in some detail. And yes, that includes the 200V and 1000V ranges. - Rob. Op 12-3-2012 23:13, John Phillips schreef: > Hi, > I have calibrated several Fluke 8840A DMM but have never seen one that > needed the 100 or the 1000 VDC range calibrated. The instructions I have do > not say anything about calibration constants for these ranges. > I have changed the 100X voltage devider but that did not help. > 10 VDC reads 9.9997 > 10 VDC on the 100 scale reads 9.985 > 100 VDC reads 99.915 on 100 scale and 99.81 on the 1000 scale. > 1 VDC on the 10 scale reads 0.9999 > The 100 to 1 dividers are about 99.995 and 99.997 to one. The 99.997 > divider is in the unit now. > > What did I not do to get this to work. There must be a step someplace to do > a math cal on the 100 to 1 divider. > Thanks you... > .

Thank you... On Tue, Mar 13, 2012 at 8:27 AM, Rob Klein <rob.klein@smalldesign.nl> wrote: > John, > > I do not know what these "instructions" you have are, but the 8840A manual > (http://assets.fluke.com/**manuals/8840A___imeng0300.pdf<http://assets.fluke.com/manuals/8840A___imeng0300.pdf> > )**, pp. 112 - 114, describes > the calibration procedure in some detail. And yes, that includes the 200V > and 1000V > ranges. > > - Rob. > > Op 12-3-2012 23:13, John Phillips schreef: > > Hi, >> I have calibrated several Fluke 8840A DMM but have never seen one that >> needed the 100 or the 1000 VDC range calibrated. The instructions I have >> do >> not say anything about calibration constants for these ranges. >> I have changed the 100X voltage devider but that did not help. >> 10 VDC reads 9.9997 >> 10 VDC on the 100 scale reads 9.985 >> 100 VDC reads 99.915 on 100 scale and 99.81 on the 1000 scale. >> 1 VDC on the 10 scale reads 0.9999 >> The 100 to 1 dividers are about 99.995 and 99.997 to one. The 99.997 >> divider is in the unit now. >> >> What did I not do to get this to work. There must be a step someplace to >> do >> a math cal on the 100 to 1 divider. >> Thanks you... >> . >> > > > ______________________________**_________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> > and follow the instructions there. > -- John Phillips