Limit the range

[Marco Trapanese]

Hi to all,.

I apologize if my English is no so good, I hope it's good enough to explain my problem.

I'm quite new to both NI boards and Measurements Studio: I searched in past threads without find a complete answer to my questions.

I have a PCI-6229 DAQ board configured by MAX. Then, I acquire data with Visual Basic .NET. We're speaking about analog input tasks.

My question is: how to actually limit the input range of measured data (possilby in MAX)?

I know I can define the input data range but the actual values may change a little either over or under these limits. I need a sort of "clamping" so if I set say 5V as maximum allowable value and the board read 5,01V I want to read 5V.

Currently I achieve this in my software with several if..then statements for each analog input:

[pseudocode]

if readvalue > MAX then outputvalue = MAX

elseif readvalue < MIN then outputvalue = MIN

else outputvalue = readvalue

However, I'm wondering if I can setup MAX to do this automatically.

Thanks for any answer.

Marco Trapanese

--

Femtotech

[Filippo_Persia]

Dear Marco,

Actually what are you seeing is expected behavior. DAQ driver allows a little "over measure",  usually this feature is great for troubleshooting purposes.
Looks like you found a viable solution in Visual Studio.

Altough I'm not a Visual Studio Guru, I'm quite confident you can find some kind of array threshold funtion to get an easier solution.

have a good day.

[Marco Trapanese]

I read the 'input range' setting actually doesn't limit in anyway the output values. It just set the closest ADC range. Am I wrong?

However, I need to exactly limit the output range so I will look at a convenient solution in .NET, as you suggested.
Thanks

Marco