Voltage come back incorrectly Agilent 34970 advanced scan.vi

Question

Hello,
I am using an Agilent 34970 wich is connected with serial port to computer and performing voltage measurements  for 16 channel using an Agilent 34902A  16-Channel Multiplexer (2/4-wire) Module
When using Datalogger voltage reading of the 16 signal are correct
When using Agilent 34970 advanced scan.vi we can take a voltage reading with the instrument's front panel but it always come back incorrect for the three first channel despite the number of channels tested : (exemple  for 260 V we acquire 272V even the signal is accurate the 13 other signal are correct) 
we checked the signal manually and they are accurate
when performing auto delay for Agilent 34970 the measurements  are correct but it take too much time , when putting manual delay the problem is still appearing even a delay of 1s for each channel .
Is there any solution to reuduce the delay ( about 0.2s for each channel ) and to have correcte Voltage
Thanks

Answer 1

Hi Vin_sagem,
Good afternoon and I hope your well today.
Is this VI/LabVIEW code your using provide by Agilent or have you writen it yourself using a programmers guide to the instrument?
If Agilent have written it for you/provide it for their customers I would advise you contact them through your support. Otherwise, I would ask if you could post the trouble example code (Not your whole application) that clearly shows the issue your having. Thus, the community can try to identify any problem areas. 
I hope this post finds you well, 
Kind Regards
James Hillman
Applications Engineer 2008 to 2009 National Instruments UK & Ireland
Loughborough University UK - 2006 to 2011
Remember Kudos those who help!