error 200279, when trying to save waveform

[sbomy]

Dear Sir,

When trying to save voltage waveform(by clicking record button, to save into ASCII file),

the waveform is distorted and soon it comes "error 200279" with the following message:

==================================================================

Possible reason(s):
Measurements: Attempted to read samples that are no longer available. The requested sample was previously available, but has since been overwritten.
Increasing the buffer size, reading the data more frequently, or specifying a fixed number of samples to read instead of reading all available samples might correct the problem.
Property: RelativeTo
Corresponding Value: Current Read Position
Property: Offset
Corresponding Value:

Task Name: _unnamedTask<105>

==================================================================

Is it because of memory in PC? or do I have to adjust sampling rate?
Please give me some tips to resolve this problem. Thank you.

[Sappster]

Hi Sbomy,

There error you are receiving is a buffer overflow error and can be easily corrected by decreasing the sampling rate or increasing the buffer size and the samples to read. Here is some information about it:

http://digital.ni.com/public.nsf/allkb/BB4E0A58688EB812862562C2004DF9A5?OpenDocument

Let me know if you have any other questions.

[sbomy]

THank you for the reply. It works by decreasing sampline rate. 

But, how can I increase buffer size?

Thank you.

[Sappster]

Hi Sbomy,

By Default LabVIEW will handle the buffer size and make it twice the size of your samples to read. So you can increase your samples to read and labVIEW will increase the buffer size.

If you need to alter the buffer size manually, you can use the advanced DAQmx VIs for the buffer you are using.

Let me know if you have any other questions.