HI,
1. You are acquiring an external signal first of all. That is a pressure signal. That must come into a system that acquires physical signal. It can a SCB-68. But for serious applications when you need to remove noise, or in other words, you need to condition the acquired signals, you need Signal Conditioning System. The devices are called SCXI (Signal Conditioning Extensions for Instrumentation). There are different types of SCXI devices such as SCXI-1100, SCXI-1102, SCXI-1140, SCXI-1141, SCXI-1520 etc. You use one or the other depending on your application such a current measurement, voltage measurement, frequency measurement, filter block etc. I am providing some nice links that I would suggest you to take a look at for better understanding.
2. Once you acquire the physical signals and process them using SCXI, you send the processed signals into computer. Here, in the computer, there is something called Data Acquisition card (DAQ). DAQ cards acquire the signals, converts the analog signal into digital and stores into computer memory. Some DAQ cards are PCI-MIO cards.
Please feel free to give National Instruments Support for more information on products for your system set up.
Regards.
