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| Benchmarking GPIB |
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| dietert1:
I remember testing a DIY GPIB adapter with two of them connected to two PCs and looking at the transfer rate depending on transfer size. The CPLDs in those devices use digital filters for debouncing input signals at a sampling rate of 18 MHz. The implied data rate limit is about 3 MHz. The PC interface is a FT245RL USB chip (at most 1 MByte/second). The maximum transfer rate was as expected. Really the test was more about error rate. In general when using GPIB for T&M automation such a PC adapter won't be the limiting factor. You need a very fast instrument to demonstrate the difference between two different adapters. Of course somebody can make a really bad adapter that slows things down, e.g. using bit-banging drivers. As far as i understood nowadays good USB adapters are available from China for about US$ 85. Does this justify benchmarking? Is this about identifying fakes? Regards, Dieter |
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