XLINK 500/100 Operations & Maintenance Manual page # 76
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.
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;
12:05 Sample sensor (reading = 5.0). Compute and log 5-minute average. Result = 3.0,
computed as (1.0+2.0+3.0+4.0+5.0)/5;
12:06 Sample sensor (reading = 6.0). Compute and log 5-minute average. Result = 4.0,
computed as (2.0+3.0+4.0+5.0+6.0)/5;
12:07 Sample sensor (reading = 7.0). Compute and log 5-minute average. Result = 5.0,
computed as (3.0+4.0+5.0+6.0+7.0)/5;
Compare this to a simple average. A simple average over five minutes would produce a reading
every five minutes. It would be setup with Measurement Interval of five minutes, an Averaging
Time of five minutes, and a Sampling Interval of 60 seconds.
12:01 Sample sensor (reading = 1.0). No reading is logged.
12:02 Sample sensor (reading = 2.0). No reading is logged.
12:03 Sample sensor (reading = 3.0). No reading is logged.
12:04 Sample sensor (reading = 4.0). No reading is logged.
12:05 Sample sensor (reading = 5.0). Compute and log 5-minute average. Result = 3.0,
computed as (1.0+2.0+3.0+4.0+5.0)/5;
12:06 Sample sensor (reading = 6.0). No reading is logged.
12:07 Sample sensor (reading = 7.0). No reading is logged.
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