Pst/plt Timings on
Out-of-Range Recording Periods

The power recorders use an "observation period" for flicker that is 10 minutes for monitoring intervals of that are at least 24 hours, and not more than 1 month. In intervals of that length, you would see the 10 minute Pst readings you expect. But in the shortest and longest monitoring intervals, it is adjusted for better accuracy. Here is a chart that tells what the Pst readings will cover..

Recording Period	-	PST points
15 Min	-	n/a
30 Min	-	n/a
1 Hr	-	30 Sec
3 Hr	-	30 Sec
6 Hr	-	1 Min
12 Hr	-	5 Min
24 Hr	-	10 Min
.	-	.
1 Month	-	10 Min
90 Day	-	15 Min
1 Year	-	4 Hr

PLT is calculated over 12 datapoints in all cases, so in the case of a one hour monitoring period, 12 points (each 30 seconds) gives a PLT reading every six minutes, or 10 in an hour.

If there are any questions please ask.