Has anyone any experience with a USB-6008 and reading a thermistor value

[SteveL 704]

Labview 8.0 connected to a USB-6008

I am using 'BC Components' NTC Thermistor. I used the express VI to create a Vex input and entered the A,B,& C values from the datasheet. The thermistor is the 10K version and I placed a 10K resistor in series with it. I wired it as is shown in the connection diagram, and applied 2.5 volts to it.

I get completly the wrong temperature readings out of it! I called the NI help line in the UK and the engineer confirmed that I had done everything correctly but couldn't understand why it didn't work.

Any thoughts?

Steve Lawson

[JamesC]

Hi Steve,

The only things I can come up with is to try using 4-Wire mode for the thermistor, or you could send in one of these thermistors to the UK office for us to look at.

Regards
JamesC
NIUK and Ireland

[RRRRSSSS]

I had a similar problem, had it working at one point then screwed it up.

try this:

[RRRRSSSS]

Here is the LV 8.0 version

[SteveL 704]

Thanks for the 'Temp Pressure EXpress80.vi' but it won't load because LV can't find the 'Convert thermistor reading.vi'. Either it is a VI that you wrote or it is part of LV8 that I haven't loaded.

I'll give it a try once I get it working.

I will also try the 4 wire mode before I send a device to NI.

Steve Lawson.

[RRRRSSSS]

Tryconfiguring it as a 2 wire Iex.

[paulmw]

I know that this thread is old but I ran into the exact same issue as the OP.  I found that the solution is to wire up the NTC Thermister to a differential channel, not SE channel.  Then it worked fine.  Apparently the measurement is a differential measurement and one of your differential inputs is probably floating, at least is was for me.