Pushing it to the limit! I like it. I hadn’t tried this experiment. But I don’t think you’ll get the behavior you’re looking for…
The logging mode is not really built for high frequency logging. It’s all built around the assumption that the meter will have to wake up, log a sample, then go back to sleep for a while. Waking up and logging a sample can take between 10 and 500ms, so that’s what really dominates the maximum logging frequency. The actual sampling time is only a very small part of it.
So to sum up, I suspect there may be a bug that gets activated when sampling in that extreme of a case because the firmware was written with the implicit assumption that sampling would be pretty slow. I’ll run this experiment next time I’m doing an update. Can you try slowing it down in the meantime, or is that not useful for your purposes?