Set the format digital u32 when writing of TDMS files

We use two meters of a PCI-6251, with two counters in the mode of angular position, to measure the angular positions of the two optical encoders 1000 per second for intervals of 10 to 20 hours.  We are writing to write files using PDM.  The files are very large, about 800 MB, but it is acceptable.  Convert us the TDMS files in .txt files, and then the data from .txt files are analyzed in Mathematica.

My question is: How does one control the digital format of the data that is written in TDMS write?  At this moment we have two counters of the value of the product N = 10000 numbers U32 samples are then transmitted continuously to a TDMS file every 10 seconds.  The counters are using units of ticks (integers) and we would like to see whole in our data files.  We are convinced that the counters are producing U32 to the format number, since we see the correct U32 integers in the indicators on the front panel and we see labels on the value axis on our waveform graphs are integers, not real numbers.

But it is also clear that Scripture TDMS puts double-precision (64-bit) numbers floating point in the PDM file, not numbers of U32.  The double-precision floating-point numbers cause our .txt files to be twice as big as they should be - these .txt files are half full with useless zeros and decimal points.  In addition, when you convert the U32 to double-precision real numbers, it seems to be a loss of precision as a result of writing of PDM, which is not acceptable.

Our experience produces pairs of integers: U32 (or I32) format.  We could even get away with numbers I16.  Is it possible to get our data to stay in U32 (or same I16) format when they are written to the TDMS file?  What controls the digital numbers written to tdms?  Do all the numbers written in a PDM file end up being written as floating-point numbers double-precision?

We use LabVIEW 8.2 on a PC running windows XP.

If associate you TDMS write U32 data, data in the file will be U32. Floating-point conversion probably occurs when you read data from the file back. You can change this by plugging in a U32 empty table at the entrance of 'data type' reading PDM.

You can check the data type in the file by examining the channel properties in the viewer of TDMS files. If NI_DataType is 7, given in the file are U32. If it is 10, data are floating point.

Hope that helps,

Herbert

Tags: NI Software

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