NOVALUE in TDMS

Hi everybody,
I want to write a TDMS file that includes NOVALUES. Because of different datatypes for different channels these NOVALUES also have different definitions. In the former DAT format it is possible to specify the value that is used as NOVALUE in each channelheader. But for TDMS I only found the property “novaluekey” which tells if the channel contains NOVALUES or not. Unfortunately I don't get anything from the TDMS file format internal structure documentation or DIAdem Help.
So how can I set the NOVALUE definition in the TDMS file format? I want to write this file on my own and read it with DIAdem 2012.
And in addition: is there any documentation on the properties that can be interpreted by DIAdem (e.g. DIAdem can read the scaling properties that are only mentioned in the context of LabVIEW)?
Thanks
Cynthia

Hi Cynthia,
TDMS supports channel values being set to NoValue using the IEEE denormals for SGL (Float32) and DBL (Float64) data types.  In LabVIEW, you can write a NoValue to a data channel by writing a "NaN" real number.  You just plop down a DBL or SGL constant and type in "NaN" instead of 3.14 or any other real number.  Then wire that orange "NaN" constant to an element in an array and send that array to a channel in the TDMS file.
On the property reading front, use any of the IEEE standard integer and real number data type, plus string and date/time.  You'll need to also make sure to name the property with only letters (A-Z), numbers (0-9) and the underscore character ("_"), and you can't start the name with a number.
Brad Turpin
DIAdem Product Support Engineer
National Instruments

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