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MCC USB-205 Sampling


kseidl3

Question

The MCC USB-205 is able to sample 4 AIN channels at 125 kS/sec, is there sample-and-hold circuitry so sampling is near simultaneous across channels? Or is there a consistent delay between samples on different channels?

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There is no sample-hold circuit before the analog inputs. The time skew from channel to channel is the inverse of the aggregate rate, 500k or 2us. It's more noticeable at lower rates. For instance, sampling four channels at 1000 S/s is 1 / 4000 or 250us. However, this can be good because it allows the channel more time to settle down before the measurement. 

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