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I use the NI USB-9215 DAQ device...Can I use another amplifier (Device include amplifier also)? I measure signal with piezoelectric sensor and it is neccesary to use sensor own amplifier before I connect that in DAQ device...cause it dissorder or etc.??
It's absolute legitimate to cascade two amplifiers. In fact in your case an external amplifier is mandatory as a piezo is a voltage source with very high impedance that probably couldn't be measured correctly with the 9215 without external signal conditioning.
