The National Instruments PCI-6601 (Part Number: 777918-01) is a versatile Counter/Timer device designed for high-performance timing and input/output tasks within PC-compatible systems, PXI frames, or CompactPCI enclosures. This model features four 32-bit counters with a resolution of 12.5 ns, capable of handling frequency measurements of up to 20 MHz, making it suitable for applications involving encoder position estimation, event counting, and pulse generation. The PCI-6601 offers 32 bidirectional digital I/O channels that are compatible with TTL/CMOS levels, providing flexibility for various digital signal requirements.

A key feature of the PCI-6601 is its pre-scaling capability, which allows it to accurately process signals that exceed the maximum time-base of the counters by employing 2X and 8X pre-scalar functions. This function is particularly useful for counting edges in high-speed repetitive signals, where users can tolerate a minimal counting error. The device includes a 68-pin male SCSI-II type I/O connector for easy integration into existing setups.

With dimensions of 6.9 x 3.9 inches, the PCI-6601 is compact yet powerful, operating within a temperature range of 0 °C to 55 °C. This device is calibrated via the NI-DAQ 7.4.4 and is compatible with various software development environments, including LabVIEW and Microsoft Visual Studio. Although National Instruments has announced the mature status of the PCI-6601, it remains available for purchase and repair through Apex Waves. The product is backed by a three-year warranty, and user and maintenance manuals are available for download. For pricing information, please contact a sales representative.