Abstract
A four channel scaler for counting applications has been designed and built using a standard high transfer rate parallel computer interface bus parallel data card. The counter section is based on standard complex programmable logic device integrated circuits. With a 200 MHz Pentium based host PC a sustained counting and data transfer with channel widths as short as 200 ns for a single channel is realized. The use of the multichannel scaler is demonstrated in dynamic light scattering experiments. The recorded traces are analyzed with wavelet and other statistical techniques to obtain transient changes in the properties of the scattered light.
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