Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 152
Val). This gives you a chance to test the measurement of each input to make sure it is
connected and configured properly. You can press SET to make a measurement of the
input or RIGHT to start a calibration if the sensor is already wired. If the value displayed
is not correct, review your setup and correct as needed before going on.
f. When you get to the outputs section of the menu (e.g. M1O1), you’ll want to examine
each output to make sure the data is displayed, logged and communicated as desired.
Not all outputs need to be displayed, logged, or communicated.
g. Repeat to set up all the measurements in the system.
4. Return to the communications menu and make sure that your Satlink (or other
communications device) has the proper settings and outputs assigned. In the case of
Satlink, check the “SelfTimed Settings” and make sure to “Select Outputs” to view all
outputs assigned.
5. Turn Recording ON and use the menus discussed earlier in the Operations section to view
inputs, outputs, communications formats etc.
More Complex Measurement Setups
For some applications, a single measurement cannot be configured to record the data you want,
such as the current accumulation of solar radiation throughout the day or the intermediate
value of an average. In these cases, you can use one measurement to reference another
measurement’s data to achieve the averaging, accumulating, and logging intervals you want.
The Accumulate measurement type has outputs of a) the accumulation at the end of a
measurement interval and b) the accumulation samples (values before the accumulation
calculation is performed), output after every sample. What this does not achieve is the current
value of the accumulation at any time within the measurement interval. To get this current
accumulation, you must set up two measurements- the first is the accumulation itself, and the
second is an instantaneous measurement whose sole purpose is to get data from the
accumulation and log it more frequently. This is done by using Reference as the input type of
the second measurement, and choosing the accumulation when prompted for which output to
reference.
Understanding this concept of referenced measurements is key to building more complex
measurement setups- it lets you access “intermediate” data (data before the measurement
interval is complete) for Averages, Vector Averages, and Accumulations. You can use the same
referencing concept to take an Average of an Average, take an Average of several
Accumulations, or many other combinations. While it may seem difficult at first, this is a very
powerful tool once it is understood.
Below is a visual example of a setup used to record the solar radiant energy accumulated
throughout the day (WHrs/m
2
) and instantaneous radiation (W/m
2
). The Accumulation,
SolEnergyDaily, takes a radiation sample every 10 seconds, and uses these to compute the
accumulation of solar energy over 24 hours (with WeightForTime = Yes to convert units to
WHrs/m
2
). SolarEnergy references or “asks” SolEnergyDaily for the current accumulation every 2
minutes, and it performs the output operations configured- logging and transmitting via Satlink
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