I have random reading in an analog input signal

[shabo]

I am using SCB-100 with PCI-6033E. I have 26 differential channels, one of them is for CJC. There is one channel (that I am testing with MAX) gives me random value that eventually goes to zero. I tried to hhok the signal to differnt channes but I still have the same problem.
I checked the signal itself with a multimeter connected to the channel pins (in the connector block)
and it was ok.
I have tested the board online and it was ok.

[aasenjo]

Shabo,

In this cases the first thing you have to make sure of is that the Measurement Mode (MAX -> Board Properties -> AI Tab) matches the wiring of your signals. Depending on whether you are performing differential or Single Ended measurements, the signal connections vary. Please refer to your board's manual for more information on the measurement modes and their respective wiring. (http://www.ni.com/support -> Product Manuals)

Knowing about the measurement mode you are using would help the giving of further suggestions.

I hope this helps,

Alejandro Asenjo
Applications Engineering
National Instruments