SCXI-1120 Gain

[shall]

I have 5 test racks running the same hardware and software.  On one rack, an SCXI-1120 board seems to have a gain of 2 on channel one no matter what I do.  The other 7 channels have unity gain.  The input on channel 1 saturates at 4.12 volts.  The inputs on the other 7 channels saturates at 8.24 volts.  I've tried 3 different boards in the rack and the problem persist.  The boards work fine in other systems with identical software and configuration.  I've reinstalled traditional NI-DAC.  I've set the gain using both MAX and AI config.vi.  I've also tried installing the board in a different slot.  Any ideas?

MS Windows XP

LabVIEW 8.2

Traditional NI-DAQ ver 7.4.1

SCXI-1001 chassis

[MXI Master]

shall,

If I understand properly, the problem is following that particular slot in the chassis, not the board that was in the slot.  So these boards when placed in other slots all have gain of 1? Would it be possible to put the 1120 in a  different slot of the SCXI and place some other board in the malfunctioning slot to work around the problem. I have found no known issues with the 1120 and gain.

Also, it might be worth while to check all the jumpers on the boards againt the user manual to make sure they are in the proper locations.

[shall]

I have moved the SCXI-1120 from slot 1 to slot 8.  The problem remains.   It is not releated to a board or a slot.  I am thinking it might be the chassis.

[shall]

Also, the jumpers have been checked.  I have tried 3 boards and they all do the same thing.  They work fine in other systems but channel 1 always appears to have a gain of 2 in this system.

[MXI Master]

One final question, before we lay the blame on the chassis. Have you tried  different DAQ boards to control the malfunctioning chassis/ con troller slots? Other than that, it does sounds like it probably the chassis malfunctioning.

[parker_irvine]

The MIO board check out.  I've sent the chassis and SCXI-1120 to NI for repair.