In-Situ Level TROLL 300/500/700/BaroTROLL Operators Manual - Manual (Page 53)

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5. Select the parameters you intend to measure, choose the measurement units, and
specify the order in which the selected parameters will be logged.
6. Select the logging method you intend to use. See page 53.
7. Select the log interval. A log interval is how often a measurement will be taken and
stored.
8. Select the start condition, stop condition, and specify how to handle full device
memory.
9. If you selected Level or Depth as a parameter to measure, specify how you intend
to log this parameter. See page 54.
10. The final screen summarizes the log setup. Click the check mark to write this
information to the instrument.
Logging Method Descriptions
The following is a list of log types and their descriptions. The log types that are
available on an instrument vary depending upon the capabilities of the instrument
model.
Logging Methods for Long-Term Monitoring
Linear
Linear log type measures and records at a user-defined fixed interval of one minute or
more. This method is used for long-term studies, landfill monitoring, stream gauging,
tidal studies, and background monitoring prior to aquifer testing. Intervals are measured
in days, hours, or minutes.
Linear Average
Linear Average log type can smooth out anomalous highs and lows that may occur in a
data set, for example, when a water wave passes over the instrument. Each stored
measurement is the average of several rapid measurements. This method is used for
long-term studies, stream gauging, tidal and open-water studies where trends are more
important than accuracy. Intervals are measured in days, hours, minutes, or seconds.
Event
Linear Event log type combines basic fixed-interval logging of specified parameters
with the ability to log data at a faster interval when a single-parameter event condition is
present.
Logging Methods for Aquifer Testing
True Logarithmic
True Logarithmic log type captures early-time water-level data during aquifer testing.
Measurements are very closely spaced at the start of the test (4 measurements per
second) and move further apart on a logarithmically decaying schedule as the test