Time lapsed
(seconds)
Temperature Logger
action
10
20.9°C
Reads temperature and then waits 10 seconds
20
19.8°C
Reads temperature and then begins storing all sensor
values every 2 seconds
42
20.1°C
Reads temperature and then waits 10 seconds
52
20.5°C
Reads temperature and then waits 10 seconds
Note
: When you use the thresholding option, averaging cannot be enabled.
Hysteresis
Hysteresis can be enabled only when you also enable thresholding (Properties
view/Setup/Basic Configuration tab). The hysteresis option lets you specify the maximum
time that the logger will continue to store samples while the thresholding condition is no
longer met. After that time lapses, samples are not stored until the next time the logger
checks for the thresholding condition and finds that it is met.
Note that Ruskin enforces an hysteresis period that is a multiple of your sampling period. If
you change the value of your sampling period, the hysteresis value changes to the same
value.
Hysteresis is often used when splashing or wave action is a factor. For example, you
program your logger to take readings only when it is in contact with the water. You use the
thresholding option to check every six seconds whether there is contact. Because the wave
action changes the height of the water surface, the logger fluctuates upon deployment
between being in and out of the water. By enabling an hysteresis value of ten seconds, your
logger continues to store samples while not contacting the water for up to ten seconds at a
time.
November 5, 2010
Rev1.4
12
