- From: Jason Z.S. Guo <JasonGuo_at_pcg.wustl.edu>
- Date: Tue, 05 Nov 2002 11:59:59 -0600
I am using National Instruments pci-6071e board on Redhat 7.1. The comedi version is comedi-0.7.65/comedilib-0.7.19. We meet a problem that when output range index is 2, the output range is not [-1, 1] claimed by demo/info and comedi_get_range(). We used demo/outp and a multimeter to measure the outputs, which are 58mV when sample=0, 33.2mv when sample=2048, and 8.3mV when sample=4095. But when output range index=0, the range is correct (comedi_get_range() says the ranges is [-10V, 10V]. Our measurement is: -9.96V when sample=0, 33.2mV when sample=2048, and 10.02V when sample=4095.) When output range index is 1 ([0, 10]), the range is also correct, but when index is 3 ([0,1]), the range is wrong again. We tested 2 boards, both of them have this problem. Any idea? Thanks for help. Jason
Received on 2002-11-05Z17:59:59