The rate is how often a sample is taken by the a/d. The sample count is how many of those samples you return to the program. For example, if you had a rate of 1000 samples per second you could request 500 samples which would take 500 ms to acquire. At a rate of 2000 samples/sec, requesting 500 samples would take half as long. Keeping the same 2000 samples/sec and requesting 2000 samples, we are back to to 500 ms to acquire.
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