is daq bit resolution applied to the range set in daq assistant or is it to physical voltage limits of daq.

[m.caron]

Hello, So this is my first post here,

I was wondering about this :

When you set up a new daq with daq assist, is the resolution applied to the voltage / number of inputs you set, or is it a fixed value per volt per channel.

For example :

i have a usb-6015 daq, it has 16 analog inputs, 16-bit resolution 250 ks/s -10 to 10 volts.

so is it like (2^16)/(16 *(10 - -10))= my resolution per channel per volt?

or does this have nothing to do with the ammount of channels,

if i want to measure over 0 to 5 volts, does my 16 bit apply from 0 to 5 or is it still over the daq's scale (which is -10 to 10 volts)

Thanks

Marco

[NIquist · Accepted solution]

You will get full 16-bit resolution on every channel regardless of how many channels are configured.  Most DAQs are multi-plexed so your sampling SPEED specification in usually an aggregate meaning that you can only scan channels at a sample rate = MAX RATE / # of CHANNELS.  Also, most NI DAQs have a Programmable Gain Amplifier on the front end so if you specify a smaller voltage range in your task configuration the amplifier will automatically increase the gain to use the most ADC bits possible.  Check you device spec sheet and manual for details...

[m.caron]

This is exactly what i wanted to know, thanks very much!