Section 8.
Troubleshooting
Diagnostics in the LI-710 can be imagined as three tiers. First, inside the instrument,
every measured value (1/10th of a second) is tested for spikes or plausibility. Implaus-
ible data points are quietly discarded by the LI-710; you can see how many were dis-
carded in the eighth parameter of group 1 see (Group 1: Results and sample count on
page7-2), and the percent used as the eighth parameter of group 3 (see Group 3: Per-
formance information and diagnostics on page7-3). A measurement has up to 18,000
wind and water vapor samples. This is the number of points used to compute the res-
ults for the 30-minute period. Note, however, that you should rarely be concerned
with the number of discrete points used in a calculation.
The second tier of diagnostic information can reveal more about what was wrong
with a particular measurement, details about environmental conditions for the time
period, and information about the LI-710 performance over that time period. You
can use this to identify an issue that can be addressed by servicing the LI-710. This is
the diagnostic value recorded as the ninth variable in data Group 0 and Group 1.
A third tier of diagnostic information is the number of data points used in a flux cal-
culation. DataQC is the eighth parameter in Group 3: Performance information and dia-
gnostics on page7-3.
Diagnostic codes
Diagnostic information is included as the last parameter in output groups 0 and 1.
The diagnostic value, which ranges from 0 to 65535 (corresponding to bit positions
0 through 15), encodes one or more of the issues indicated.
8-1LI-710 Evapotranspiration Sensor Instruction Manual
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