Sutron 8310 - Page 68

Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 68
YES/NO. When YES, allows user to enter threshold value for comparison against
incoming sample (AccumEvent determines what happens as a result of the comparison).
When NO, no threshold test is performed on incoming sample.
Threshold
When UseThreshold is YES, the input is compared to threshold as a part of the
accumulation process. If AccumEvent is yes, the input is changed to a 0 or 1. This is
useful for counting the number of times an input exceeds a value as is needed for
sunshine duration accumulations. If accumevent is no, the input is added to the prior
accumulation only when it exceeds threshold. This is useful for totalizing measurements
where you want to ignore values below threshold.
AccumEvents
YES/NO -- only applicable/shown when UseThreshold is YES. When YES, add 1 to
accumulation if sample >= threshold, else add 0. When NO, accumulate sample only if
sample >= threshold.
SampleInterval
Defines how often to take a sample. The input processing step (Mx.Ix Processing) is first
applied, and then the threshold test is applied to each sample. The result is then added
to the current accumulation. Processing steps defined for an output are executed after
all threshold and time-weighting computations have taken place. These values are
available as an output and can be referenced by other measurements.
Interval, Time
The accumulation is reset to 0 according to Interval and Time, as described above for
Instantaneous measurements.
WeightForTime
When WeightForTime is YES, the system multiplies the input by the deltatime in minutes
for a time weighted accumulation. Use a processing step on the output to convert the
time base from minutes to hours (multiply by 1/60) or seconds (multiply by 60)
Here’s the overall logic for the accumulation calculation.
UseThreshold
AccumEvent
WeightForTime
Calculation
N
D
N
Sum(x)
N
D
Y
sum(x * interval)
Y
N
N
sum(x, x>t)
Y
Y
N
sum(0|1, 1: x>t)
Y
Y
Y
sum(0|1 * interval, 1:
x>t)
Y
N
Y
sum(x * interval, x>t)
Y=YES, N=NO, D=Don’t care
Example: