XLINK 500/100 Operations & Maintenance Manual page # 75
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.
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. The station 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,
60 samples will be taken every hour, with approximately a one-minute break between each
sample.
If the sensor being used was noisy and needed filtering, several Subsamples could be collected
and averaged into one sample.
In the setup for temperature above, if the number of Subsamples were set to five, five readings
would be collected at the start of every minute and averaged. 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
00:15:00 first sample collected
00:30:00 next sample collected
00:45:00 next sample collected
01:00:00 last sample collected
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. The running
average is recomputed 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 .
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