Sutron Satlink 3 - Page 72

Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 72
Setting the Averaging Time to 00:00:00 (zero) disables averaging -- one sample is to be
collected. This is the default setup. If Averaging Time is zero, Sampling Interval and Subsamples
will not be shown in the setup.
When averaging, Satlink takes several samples and averages them into a final result. Each sample
may also be composed of several subsamples.
 Averaging Time determines how long to collect samples for.
 Sampling Interval dictates how often to collect each sample.
 Subsamples tell how many sensor readings to include in each sample. Do not use
Subsamples unless you need two levels of averaging.
 Result lets you specify what statistical value to log: average, min, max, running average,
running min or running max.
The simplest averaging requires only the use of Averaging Time.
9.2.3.1. Example: Average Temperature Over an Hour
If you want to know the average temperature for an hour, you would set up the Averaging Time
to one hour. Sampling Interval or Subsamples would not need to be changed. Satlink will collect
sensor data all throughout the hour as fast as possible.
However, if the power consumption for measuring the sensor continuously for an hour were
unacceptable, you would use the Sampling Interval.
To take one sample every minute, the Sampling Interval should be set to one minute. That way,
Satlink will take 60 samples every hour, with approximately a one-minute break between each
sample.
If the sensor being used was noisy and needed filtering, Satlink could take several Subsamples
and average them into each sample.
In the setup for temperature above, if the number of Subsamples were set to five, Satlink would
take five readings at the start of every minute and average them. That result would be used as a
sample. Once an hour, 60 samples would be averaged into a final result.
Data collection starts at Measurement Time + Measurement Interval – Averaging Time +
Sampling Interval, and the last sample is taken at Measurement Time + Measurement Interval.
In the example below, temperature is measured every 15 minutes and averaged for an hour:
 Measurement Time 00:00:00
 Measurement Interval 01:00:00
 Averaging Time 01:00:00
 Sampling Interval 900 (900 seconds is 15 minutes)
 Data Collection
o 00:15:00 first sample collected
o 00:30:00 next sample collected
o 00:45:00 next sample collected
o 01:00:00 last sample collected