My device will simulates all of the 'harshness' of the loads. You can program in a 'current sequence' and have it run the sequence for a long time. So say you want to compare different batteries for a digital camera. You can record what the camera does to a battery while taking one picture. You can then have my tester run that sequence say once every 5 minutes until the battery is dead. So anyways... The resistor types really won't be *that* big of a deal. But... I figure I may as well pick the best ones possible and try to avoid any problems right from the beginning. Eric On Wed, 7 Apr 2004 07:17:15 -0400 "Rick C." wrote: > Since batteries are subject to all kinds of harsh loads, inductive and > capacitive too, I don't see why putting them under a textbook load would be > desirable as long as the load was consistent with all tests. Wirewound > nichrome wire resistors will stand up to harsh treatment. > Rick > > Eric Christensen wrote: > > > I am building a battery testing device that will run long-term (1-2 year) > > tests on different types of batteries. This device has a few resistors in > > the battery discharge part of the circuit that I would like to be as > > 'ideal' as possible. The resistors will see currents from 5 amps (the low > > ohm ones) to a single uA (the high ohm ones). > > > > Does anybody have any info about the various types of resistors. I need > > to know things such as the capacitance, inductance, etc... as well as the > > stability over time. > > > > I have heard that carbon resistors absorb moisture and will change value > > over time. I have heard that wirewound resistors have a high inductance. > > By the name, I would guess that thick-film resistors have a high > > capacitance. But... I don't know the facts or have any data to back up > > these general notions that I have. > > > > I have read a few resistor datasheets, but have yet to see one that lists > > these parameters. > > > > Thanks in advance, > > Eric > > > > -- > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics