Hp34970a read vi doesnot wait for scan to finish

Question

hi all.... i am facing problem ..im tryin to read DC current values from two channels.. i modified the advanced scan vi example..
the read
vi is not waiting for the scan to finish.... i used trigger vi outside
a for loop and i want the readings to be taken for a number of times
which is equal to the trigger count.... i even placed a time delay
between the standard event vi and the read vi....the standard event
register vi has been set for operation complete bit. Yet the read vi is
not waiting.
so can anyone let me knw if the delay helps in waiting the read vi to finish the scan??
will the read vi give out the readings for each scan or will it just display random values??
im
posting the vi here... i kept the scan count to be 15 and scan-scan
interval as 1sec. ( so it implies that im using a timer source for
triggering) I used a time delay of 0.9secs in between standard event
register vi and the read vi. 
i used a for loop insted of
a while loop coz i need the number of readings = scan count. i placed
the trigger vi outside the for loop.
can anyone have a look over this vi and help me out?
Attachments:
final2.vi ‏59 KB

Answer 1

Now I placed a while loop around the standard event register vi and i am running it till i get a true in the bits set output. this time i checked the parameter'operation complete bit' instead of setting it. Only then i can see true value on the bit set output or else false.
The bit 1 is true after some time (after scanning is done), but the instrument is showing -410 error. This error actually says ' a command was received which sends data to the output buffer, but the ouput buffer contained data from previous command(previous data is not overwritten).The output buffer is cleared when power has been off or after a bus Device Clear.'
What should i do? Can you tell whether what i did is right? I atached the vi which has while loop around the standard event register vi.
Attachments:
final3.vi ‏49 KB