05-12-2009 12:48 PM
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
05-13-2009 02:58 AM - edited 05-13-2009 02:59 AM
9205 has the AI multiplexed through single ADC. So you will get only one weight and offset for that particular ADC.
Post for any queries.
05-13-2009 09:48 AM
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
05-13-2009 10:18 AM
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 😉
05-13-2009 12:11 PM
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
05-13-2009 12:37 PM
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?