Problem with GPIB read on a Real Time device

[LVD]

Hello,

I have a Real Time PXI (PXI8101) with a GPIB module. This module connects the RT device to a keithley picoampmeter. You can find the VI I use to read the measured data in the attachment.

The problem I have is when I use this VI in a timed loop (with f.e. a loopperiod of 500ms), I get an error code 6 from the GPIB read VI. If I use the VI in a regular loop with the same loopperiod, I get the correct measured value.
Can anyone explane why this only works with a regular loop? 

Best regards,

Dries

[ThiCop]

Hello Dries,

My guess is that it's in how your timed loop is configured.

Can you share the VI with the timed loop and the VI with the normal while loop?

This will allow me to confirm my guesses.