Why do TC inputs on my SCB give a 0.0000 output?

I have an SCB-68 connected to a PCI-604E (PCI-MIO-16E-4)DAQ board in my computer with Windows XP. When I open a Test Panel, I can see a reasonable output on channel 0 (CJC) and I can see noise on empty channels, but if I connect a thermocouple to a channel, the output goes to 0.000000. Why?

I'm glad you were able to see a signal in the board's test panel. The way to change the scale on the virtual channel test panel is to change the physical scale in the properties for the virtual channel.
As far as the actual readings go, I've got a couple of thoughts as to why you're not seeing what you expect. First off, the polynomial constants you're getting from the Omega catalog seem to be for a °F scale, but you're specifying the range for the virtual channel in °C. You may have meant to do this, but it's just something to double-check.
Second, I'm a bit confused by the way you're creating the custom scale. The omega equation is a 5th-order polynomial, but when you calculate the reverse coefficients, you specify
a 6th-order equation. This shouldn't be a problem as long as you enter all of the coefficients correctly, but you may want to stick with a 5th-order since that is the original format.
There's one thing you may want to try that (in my opinion) simplifies custom scaling. You can create a table of points using the original 5-th order equation from Omega and input these values directly as a Table Scale in MAX. This avoids some of the hassle of having to reverse-calculate coefficients since the original equation goes from temp. to volts and not vice-versa. This can be done easily in Excel and the calculated points can be saved as a text file. You can then create a Table Scale in MAX that reads directly from that text file. I think it helps to see some representative table values rather than an ambiguous polynomial equation.
These are just some things to consider when you get back to your office. Please let me know if you still can't get the readings you expect.
David
David H.
Systems Engineer
National Instruments

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