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offset and LSB weight for NI 9205 module

I have to adquire a DC value in Compact Rio and i am using a NI 9205 module (32-channel,16-bit analog input), so to convert the digital value from FPGA, i need to know the LSB weight and offset values to each channel of NI 9205. I have tried to use a I/O property node to get the values but i am not getting, however when i try do the samething whit the NI 9263 (Analog Output module) i dont have problems and can get the values.

 

thanks

Filipe

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9205 has the AI multiplexed through single ADC.  So you will get only one weight and offset for that particular ADC.

 

 


I have tried to use a I/O property node to get the values but i am not getting,

 

 


what is exact problem. you are getting zeroes while executing the LSB/offset nodes or you need procedure for getting those.

 

 

Post for any queries.

 

Message Edited by JK1 on 05-13-2009 02:59 AM
With regards,
JK
(Certified LabVIEW Developer)
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I guess i need the procedures to do that, because i not finding the tools to get the LSB and WEIGHT, so if you could help me...

Thanks

Filipe

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The bit weight for all common ADCs is calculated by dividing range by 2^n. n is the number of bits. So if you are using -10 to 10 volt as input range. The bit weight will be (upper range-lower range)/(2^16)=20/(2^16)

It is not any more to it 😉



Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)
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Thanks Coq, but i need to get the offset value as well, and i know that i can get from fpga using a tool in labview (property node i think) if you could help me with the procedures...

 

thanks

filipe

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SaCi wrote:

Thanks Coq, but i need to get the offset value as well, and i know that i can get from fpga using a tool in labview (property node i think) if you could help me with the procedures...

 

thanks

filipe


Could you please elaborate what you mean by offset?



Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)
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