NiRFSG_CheckGenerationStatus fails periodically

Question

Hello:
I keep observing this strange effect once in a while with my 3 channel PXI-5673 system. Just to make it clear - I have yet to find a way to reproduce this problem.
NI-RFSG 1.6.3.
There are three generators, daisy chained. I set them to generate the same file continuously for 1000 repetitions. Then after some delay I check the completion status with niRFSG_CheckGenerationStatus on all channels. In a normal case I would get 1,1,1 - i.e. all generators finished generation. However, sometimes the instrument returns 1,0,1 - i.e. the second generator didn't finish generating even though the other two did. The status of the generation flag returned by niRFSG_CheckGenerationStatus never changes. Also, niRFSG_CheckGenerationStatus never returns an error.
Any suggestions on what might be causing this error?
Thank you,
-Ilya.
Attachments:
Capture_RFGEN_2chan_complete_tmo.spy ‏946 KB

Answer 1

Hi Dan:
It happents perhaps every 50 times. Sometimes several times in the row.
In my code I have a loop that repeatedly generates the same waveforms on all three generator boards at different power levels. I have the same delay after which the code will start checking the completetion status.
As a result, I have a reason to believe that the actual generation is done and that the driver doesn't return the completion status for all cards. The completion status is '1' for two of the three instruments. It is '0' for just one of them.
Let me know if you need more information.
-Ilya.