Problems with AD DAQ

Hello!

I wrote a little comedi program some months before. Now i tried to use it and
the test results are totally different from the results i had when i finished
it. Probably my DAQ-device is damaged.
When taking analog samples the program tells me that i'm using signals with 200
and more volts !!! . Without convertion the results are between 0 - 4095 and
something around 62000 (+-2000). Because of using a NI PCI 6023E (12 bits)
DAQ-Device values of more than 4096 must be impossible.
Additional it seems to me that comedi_calibrate has problems to calibrate my
DAQ-device. Can somebody tell me if this output is ok or is there something
going wrong? 


Thanks a lot

Mirko


  CWM:/usr/local/comedi/comedilib-0.7.19/comedi_calibrate # ./comedi_calibrate
Warning: device not fully calibrated due to insufficient information
Please send this output to <ds_at_schleef.org>
Id: comedi_calibrate.c,v 1.36 2002/06/12 23:19:39 ds Exp
Driver name: ni_pcimio
Device name: pci-6023e
Id: ni.c,v 1.30 2002/06/12 23:19:39 ds Exp
Comedi version: 0.7.66
ai, bipolar zero offset, low gain
offset 0.02820(19), target 0
caldac[0] gain=-9.9920(67)e-5 V/bit S_min=53888.1 dof=254
caldac[2] gain=-9.2(14)e-7 V/bit S_min=263.98 dof=254
caldac[4] gain=-7.41666(60)e-4 V/bit S_min=78593 dof=254
caldac[8] gain=-4.18(14)e-6 V/bit S_min=246.566 dof=254
ai, bipolar zero offset, high gain
offset 3.1231(14)e-3, target 0
caldac[0] gain=-1.175501(26)e-4 V/bit S_min=4026.58 dof=254
caldac[2] gain=-3.724(12)e-7 V/bit S_min=438.092 dof=254
caldac[4] gain=-3.7871(12)e-6 V/bit S_min=418.956 dof=254
caldac[8] gain=-2.0457(12)e-6 V/bit S_min=449.492 dof=254
ai, bipolar voltage reference, low gain
offset 5.00546(21), target 5
caldac[0] gain=-1.20707(60)e-4 V/bit S_min=48792.7 dof=254
caldac[1] gain=1.29(17)e-6 V/bit S_min=546.335 dof=254
caldac[2] gain=-5.83229(61)e-4 V/bit S_min=66515.6 dof=254
caldac[4] gain=-7.41519(60)e-4 V/bit S_min=77141.9 dof=254
caldac[5] gain=-1.35(17)e-6 V/bit S_min=484.31 dof=254
caldac[7] gain=8.6(17)e-7 V/bit S_min=466.125 dof=254
caldac[8] gain=-8.04(16)e-6 V/bit S_min=534.756 dof=254
caldac[9] gain=7.5(16)e-7 V/bit S_min=442.437 dof=254
postgain: ai, bipolar zero offset, low gain; ai, bipolar zero offset, high gain
caldac set out of range (216912>255)
caldac[1] set to 216912 (216912)
linear: ai, bipolar voltage reference, low gain
caldac set out of range (-13050<0)
caldac[3] set to -13050 (-13050.3)
ai, bipolar zero offset, low gain
offset 0.03087(17), target 0
caldac[0] gain=-1.00158(67)e-4 V/bit S_min=53737.8 dof=254
caldac[4] gain=-7.41799(60)e-4 V/bit S_min=78654 dof=254
caldac[8] gain=-4.09(14)e-6 V/bit S_min=230.444 dof=254
ai, bipolar zero offset, high gain
offset 3.1212(17)e-3, target 0
caldac[0] gain=-1.175687(26)e-4 V/bit S_min=5186.65 dof=254
caldac[2] gain=-3.717(12)e-7 V/bit S_min=403.308 dof=254
caldac[4] gain=-3.7893(12)e-6 V/bit S_min=474.961 dof=254
caldac[8] gain=-2.0423(12)e-6 V/bit S_min=440.53 dof=254
caldac[9] gain=-5.6(12)e-9 V/bit S_min=414.108 dof=254
ai, bipolar voltage reference, low gain
offset 5.00488(19), target 5
caldac[0] gain=-1.20733(59)e-4 V/bit S_min=53073.5 dof=254
caldac[2] gain=-5.83689(64)e-4 V/bit S_min=58461.9 dof=254
caldac[4] gain=-7.41385(60)e-4 V/bit S_min=80399.1 dof=254
caldac[5] gain=-1.02(17)e-6 V/bit S_min=685.442 dof=254
caldac[8] gain=-8.16(17)e-6 V/bit S_min=603.026 dof=254
caldac[9] gain=-1.35(17)e-6 V/bit S_min=534.68 dof=254
caldac[11] gain=-8.8(17)e-7 V/bit S_min=481.506 dof=254
CWM:/usr/local/comedi/comedilib-0.7.19/comedi_calibrate #

Received on 2003-11-20Z11:17:35