NI434X and TBX 68T Data Acqusition

Hi Guys
i am using NI 435X and TBX 68T to read in voltage using excitation current of 1 mA passing thru resistors
i use the NI435X vi as given in the examples for NI4355X
however there is some strange readings obtained...........
(1) When i used NI 435X check. Vi and wire it to " no of scans" to NI 435X read.vi, i obtained correct voltage reading for first few readings, thereafter readings(voltage) becomes zero until after certain time, reading return to correct values again then it returns back to zero again .........why is this happening, the connections are correct ,
based on readings, its seems like at certain times, the circuit is open which physically should not be the cases
(2) for 1 attempt, i did not use NI 435X check.vi but instead wire a constant value, 5 to the "no of scans" input to NI 435X read.vi , the data obtained is correct but the no of data read is very much lesser than if i use 1
so i not sure why
search the internet but not helping.........
Anyone, please help
trying to figure out 4 a few days
but no answers
thks

Hello yongster. Please refer to the forum at http://forums.ni.com/ni/board/message?board.id=170&message.id=222104 which you created first about this question. All of your questions will be addressed here. I understand that due to the Holiday and the weekend, your question went unanswered for a couple days and I am sorry for that. However, in the future, please refrain from posting the same question in numerous places as it causes confusion and clutter in the discussion forums.
Brian F
Applications Engineer
National Instruments

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