Reading PCI-6071E off by ~.15 volts

I'm developing a DOS real mode driver for a PCI-6071E card. I've followed the examples in the PCI E Series RLPM and the DAQ-STC TRM, and I can read all 64 AI channels OK. I noticed, however, the readings are off by ~.15 volts (both negative and positive). I ran the NI DAQ software (under Windows 95) to see if it read the same values, but it read the voltage correctly. Surprisingly, after running NI-DAQ and restarting the Win95 machine in the DOS mode, my driver reads the values correctly as well! I assume this means the NI-DAQ did something to the PCI-6071E that I'm not doing in my driver. After power cycling the PC and running my driver again (without running NI-DAQ), the readings are off by ~.15 volts again. I looked through all yo
ur documentation, but can't find a missing programming step. Do you have any ideas?

Ray,
It sounds as though the board is not being initialized properly. More than likely, the calibration constants are not being loaded. You can refer to Chapter 5 of the RLPM to learn more about the Calibration DACs on your device.
Regards,
Erin

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