Sutron Satlink 3 - Page 73

Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 73
o 01:00:00 all four samples are averaged and the result is logged with the
01:00:00 timestamp
The Results field will be shown only if averaging is enabled. If it is enabled, you can select
average, minimum, maximum, running average, running minimum, running maximum to be
the logged result value. The difference between average and running average is as follows:
Average – Starts a new average each measurement interval. Computes average only at the end
of all the samples. Tracks min/max of each sample as it is measured.
Running Average – Running averages continue across measurement intervals. Satlink
recomputes the running average with each sample. It tracks min/max of the running average
(not individual samples) throughout the interval. As a result, the running minimum and running
maximum will be less extreme than the simple minimum and maximum .
If you want to transmit average, minimum, and maximum results, you need to set up three
identical measurements except for the Results field: one measurement would choose results
average, one minimum and one maximum. Note: even though you setup 3 separate
measurements, as long as the schedule is identical, the system will only be reading the sensor
once.
9.2.3.2. More on the Running Average
A Running Average is used when readings need to be averaged over a time period that is longer
than the logging interval.
For example, if you would like to produce an hourly average every 15 minutes, you would use a
Running Average. In that case, the Averaging Time should be 01:00:00 and the Measurement
Interval should be 00:15:00.
For Running Average, Averaging Time may be longer than Measurement Interval. In fact, unless it
is longer, there is no point in using a Running Average as the result will be the same as a Simple
Average.
 The Measurement Interval and Measurement Time will determine how often a reading
is produced.
 Averaging Time dictates the time span over which samples will be averaged.
 Sampling Interval tells the system how often to sample the sensor.
If you are interested in logging a five minute average every minute, set Averaging Time to five
minutes, Measurement Time to one minute and Sampling Interval to 60 seconds. Here is the
timeline of the data produced:
 12:01 Sample sensor (reading = 1.0). There are not enough samples to produce an
average. System will still compute and log a result producing a value of 1.0;
 12:02 Sample sensor (reading = 2.0). There are not enough samples to produce an
average. System will still compute and log a result producing a value of 1.5;
 12:03 Sample sensor (reading = 3.0). There are not enough samples to produce an
average. System will still compute and log a result producing a value of 2.0;
 12:04 Sample sensor (reading = 4.0). There are not enough samples to produce an
average. System will still compute and log a result producing a value of 2.5;