Assuming the DAQ card can sample at 100 kS/s, the problem is most likely the converter. The PCMCIA bus can transfer data at speeds up to 20 MB/s and the PCI bus, running at 133 MHz, can transfer data at speeds up to 1 GB/s. With this being said the PCI bus is much faster than the PCMCIA bus and will be able to handle the PCMCIA's slower transfer rate. The converter, however; will most likely introduce some latency in the transfer between the PCMCIA and PCI buses. This would result in the error seen when running at near the maximum sampling rate.
