Grant Coady wrote: > Hi Khali, > On Tue, 10 May 2005 14:35:31 +0200 (CEST), "Jean Delvare" <khali at linux-fr.org> wrote: > > >>Hi Grant, >> > > Future resistor values come in E96 series which is a noisy calculation, > the other option is resnet's where you might get 10/20 ratio or 10/30 > ratio which is also covered in E24 series. > > I've already demonstrated that E24 resistor ratios are below the basic > error of the sensor chip. E24 series over two decades gives ratios to > much better than 1/2%, point 2: is that mobo makers are likely to use > cheap 5% resistors, > Maybe, maybe not... IIRC 1% 0603 resistors are about $20.00 for a reel of 5000, where I used to work we used only 1% to minimize inventory, of course we weren't in Taiwan. But using 5% resistors in front of a sensor is just bad design. The Winbond datasheets I've looked at have 1% resistors in the schematics. What's the basis for your 5% assumption? > Sort of, datasheets can be poorly expressed, poorly understood when > one doesn't have the hardware, sure. The errors I'm finding are way > beyond that. You're trying to tell a former electronics design > engineer who was working with 50000 count A/D converters 20 years > ago how to read datasheets and where error terms come from? > You aren't the only EE around here, please don't give us a bad name by being snippy. mds
