Looking for TDMS NI_MinimumBufferSize Documentation

[LVB]

I have found some threads on the internet reagarding setting the "NI_MinimumBufferSize" property on a channel to reduce the index file size and write interval.  However, I cannot find any official documentation on this topic.  Is this property documented somewhere?  And if so, where can I obtain this and other properties for TDMS files?

Thank You

[Kevin_H]

Hey LVB,

Thank you for contacting National Instruments.  I also struggled to find documentation on this property.  I did find the following discussion forum, and hopefully it provides enough information to get you on your way.

Why are my TDMS files so large?

Take a look at that link, and let me know if you have any questions.

Good luck!

Kevin H

[LVB]

Kevin,

  Thank you for the response.  I was aware of that thread.  In fact, that is how I found out this property existed.  I am looking for official documentation.  Also, how was this property discovered with no documentation?

[Herbert Engels]

This property was introduced in LabVIEW 8.2.1, but had not been documented yet. Official documentation is on the way. CAR 4ID74PWJ.
Herbert

[ivelson]

Hello LV 'experts,

3years from now, has this issue been documented? coz now, i'm starting to study and plan to adopt this TDMS in our project, since we cannot afford DIAdem, and i believed that this "NI_MinimumBufferSize" will be very useful for my application. i'm using LV 8.5.1 and planning to upgrade to LV2010.

if still not documented, can anyone provide a snippet (BD snapshot) as example on how this is done? just for the reference for others (like me) whom do not know how to use this function.

thank you very much!

[YongqingYe]

Yes, we have the documentation for this property, you can refer to the documentation for the node "TDMS Set Properties" for detail information.

[ivelson]

Yes i saw that already in help window. but where in particular can i build this "NI_MinimumBufferSize" function? like the picture below. is this available in LV 8.5.1?

[YongqingYe]

I'm not sure what you mean by "build", but you can use this property like this:

[ivelson]

thanks!

coz i'm studying the TDMS function (just started this week), im pretty ignorant on this for now and i have no concrete reference about its possible properties to be set. so i'm expecting that the properties will be like the usual drop-down selectable (property node) like i post in my last msg.

is there a helpwindow that lists all the possible property names and property values we can set (such as serial#, NIMinumumBufferSize, etc)? or rules?

[YongqingYe]

There are not too many special internal used TDMS properties, we always treat almost all properties as common user defined properties except for some very small amout of properties. You can try TDMS File Viewer to view some TDMS files and you'll find there are 2 properties "NI_ChannelLength" and "NI_DataType" for TDMS channels in the file viewer, both of them are read-only properites, you cannot set the values for them.