DT800 timing and synchronization

The DT800 is a high speed logger capable of bust mode sampling to 100 kHz.

DT800 timing and synchronization

Postby anton » Wed Apr 19, 2017 6:37 am

I am repurposing several DT800's and my trials sofar indicate that they will be able to do a great job. But not everything is making sense to me.

To put things in context, I would like each logger to measure between 10 and 20 voltage signals, once per second, within the first 50 ms, and the loggers synchronized to within 10 ms of each other.

1) I figured out that the timestamp on the data records is the time before the measurements. I also figured out that I can get additional time stamps by adding "T" columns to see how long the measurements are taking. At one point these T columns were displaying millisecond resolution, but now I can't get anything better than one second. How can I control this? I must have changed something, but I can't figure out what!

2) I managed to tweak P46 and P60 to get more or less channels read in a short period of time, but when I try to use these values witht he FAST mode modifier, I do not get the same result at all. The schedule runs a fraction of the previous speed. Is there any other difference with FAST mode, other than the values of those three parameters? If I put in the values corresponding to Normal mode, should Fast mode run just like normal mode?

3) The default ADC rate is half of the maximum rate. What is the downside of going faster than the default rate? Is there an advantage to going slower than the default rate?
anton
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