Why do I have gap in Citadel Database

[Mirash]

Hello,

I have a serious problem w.r.to Citadel Database 5.

I am logging the entire Thermocouple channels to Citadel database using shared variablle.

Recently i figured a strange behaviour from citadel.

I found gaps in Citadel Data!!!

If you look at the below figure..

I was wondering why this is happening. There is a KB on this topic.. But it does not direct towards the solution.

http://digital.ni.com/public.nsf/allkb/6BD788DF28C8156386256F3F0077434F

Help please....

Mirash

[bruno_costa]

The problem is the method that uses the citadel to return the data. When trying to perform a query to extract data with timestamp between A and H the citadel returns data strictly with timestamps greater than "A" and less than "H" and then interpolates the data.

Assuming that the last recorded point between "A" and "H" is "F", then the citadel will return all the data between "A" and "F" and will do the interpolation. Since there are no points between "F" and "H" to interpolate the citadel returns an empty space to between "F" and "H".

This justification is only valid for gaps at the beginning and end of data.

Is there a function in LabVIEW whose name is "Read Trace" and has an option called "Maintain Trend Info", see the manual and there will be some more explanation.