Is DAQ an amplifier and signal conditioner too by itself?

[SilasIII]

I hope I am in a right forum section. I know this is a very basic qeustion but my knowledge in electronics is limited. 

If for example I have a stack of Piezo electrics and I simply take two wires as output from it and connect it to NI DAQ, is it going to be acceptable? What I mean is do I need signal conditioning first and then send it to labview or DAQ system has its own amplifier and signal conditioning and filtering environment noise system within itself? 
What is the smallest voltage (or current) that a DAQ system can detect? I know there are data sheets for each DAQ system but I do not know which parameter I should look for!
Can a DAQ system detect voltages in orders of microvolt or even nanovolt or currents in ordres of picoampere?

Thank you

[crossrulz]

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@SilasIII wrote:

Can a DAQ system detect voltages in orders of microvolt or even nanovolt or currents in ordres of picoampere?

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Not likely.  Most DAQs I have seen have an accuracy in the mV down to maybe 100s of uV.  Currents are typically measured with a series resistor and then you measure the drop across it.

For these small of signals, you will want some signal conditioning and amplification before sending them into a DAQ.

[SilasIII]

Thank you  crossrulz , in that case do you have any recomendation on signal conditioning modules for that range that I can buy? Does national instrument manufacture any? 

[crossrulz]

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@SilasIII wrote:

do you have any recomendation on signal conditioning modules for that range that I can buy?

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I recommend you just find a good Electrical Engineer who knows circuits like this.  @johnsold instantly comes to mind for me.