MATLAB: WHICH INPUT CHANNEL HAS TO BE INITIALIZED , analog input CH or digital input CH for DC VOLTAGE

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HELLO,

i have DC voltage(2.5V) which i want to plot using NI USB 6255, whether i should use the analog input or digital HW channel has to be initialized.

even if i acquire data from digital i/o channel i will get logic 1 or logic0 so how to obtain the same voltage which i give as input

plz anyone help me

Manjunath

Best Answer

If you want to plot the exact voltage in matlab, use an analog input channel. The digital channels are in TTL range voltage (0-5 volts), and if you adquire a signal of 2.5V, you will get a noisy digital signal [0 1].

Try to configure the analog channel in Differential Mode. In this mode, you gonna use 2 channels, one for posistive pole, and the other for negative pole.

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