Personal computer flexible multichannel interface for data acquisition of low-frequency signals

The design and hardware/software implementation of a flexible, multichannel interface card is described. This interface can be used for data acquisition on any IBM PC or compatible with an empty slot. It allows data acquisition from up to eight input signals with independent sampling rates. The user has the option of selecting any combination of channels. The interface is based on programmable integrated circuits which makes it flexible in its operation. A crystal clock was built on the card to make it independent of the master clock of the CPU used. By using this interface, several measurement methods which would normally require dedicated equipment can be implemented on PCs