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PXI 5105 - min record length varies with number of initialized channels

Hello everyone,

 

I'm having a hard time with this issue. Why the record length I acquire with "niScope Multi Fetch Cluster" varies, depending on how many channels I initialize? I.E., I want to fetch 20k data points per channel. If I configure and acquire from 1, 2, 4 or 8 channels, the record length of all signals is 20k points. However, If I configure 3, 5, 6 or 7 channels, the record length is 19934 points. Always 66 points less than the desired value, doesn't metter the configured record length, its always 66 points less. Doesn't metters which channels I initialize, only the amount of channels (it seems to be 2^n). And this is the record length immediately after the data acquisition block. To make things worse, the block "niScope Actual Record Length" returns the desired amount of points, and not the amount I'm actually reading.

Why is this happening?

 

If this rule is correct, I can figure out a solution.

 

Best Regards,

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Hello Giovanno,

 

Please, to this question,contact the technical support in your country so that engineers will help you.

 

Thank You.

 

Rita Souza
Engenharia de Aplicações
National Instruments Brazil

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