4351cold junction compensation using MAX and cb68

[Peasoup]

Hi

we have a pci 4351 card which we are installing into one of our existing rolling road dynos to add some temperature measurement (type K t/couples) capability as part ofa facility update.

most hardware is existing in the rig which includes a remote isothermal block with mV/deg output cold junction.  this is located in the rig with cabling into the control room where the PC and card are based.

we are using a standard cb68 (rather than specific 4351 accessories) to connect to the cabling for the thermal block.

i have defined ch0 as our cjc (defined as voltage input scaled to degC).

ch2 is defined as type k thermocouple input.  when i try and select cold junction source "user supplied" in MAX traditional (why is there no daqmx driver for this card? - pretty much everything is mx now so it is not the easiest to got back to legacy stuff) it allows me to select my cjc channel.  good so far.

if i then test the channel I get an error "Error -10241 occured at AI group config"

nothing I have tried can resolve this, other than doing the compensation in my labview code.  whilst this works it isn't a neat solution when I think it should be possible to compensate in MAX (hey, but what do I know?).

for info:

MAX v4.3,  ni-daq v7.4.4,  labview 8.5

anyone any ideas/help/solutions?

cheers

A

[Ian Colman]

Hi Andy,

To shed a bit more light on this for you, the error you are seeing means:

" One of the driver files or the configuration utility is out of date, or a particular feature of the Channel Wizard is not supported in this version of the driver."

The version of Traditional DAQ that you have seems to be up to date so I'm not sure why you are recieving this error. Were the current versions of your software clean installed or were they installed ontop of previous versions of software?

Best Regards,

Ian
Applications Engineer,
National Instruments UK & Ireland

[Peasoup]

wow, sorry about the delay in replying - other fish to fry etc etc.

I now have the 4351 card in a different (new) PC, which has just had a clean fresh new installation of instrument drivers (trad daq, daqmx, max etc.) only.

the behaviour is identical to the first machine ie get the10241 error when I select user supplied CJC and try to test the channel

Also in the properies screen I can select "DC coupled" (the only named option in the dropdown) but if i then switch to a different channel and back the "DC" setting is not held (or at least displayed). any ideas?

daqmx 8.7.1f2

trad daq 7.4.4f7

max 4.4.1.49152

All running under XP 2002 service pack 2

as mentioned i have written code to do the cold junction compensation within my logging program, but it doesn't seem an elegant solution...

cheers

a