6.5 Distance range
Generally speaking, the maximum range which can be measured varies considerably depending
on the atmospheric conditions. For this reason, the Specifications illustrate the values for both
Good and Normal weather conditions. It is extremely difficult to judge when weather conditions
are “Good” and when they are “Normal”. With this instrument, the conditions noted below are
used to differentiate between the two situations, (Good weather conditions for surveying are
different from Normal weather conditions, and in surveying situations, cloudy skies are
considered more favorable than sunny skies.)
Weather conditions for measurement ranges are based on the following standard values:
Normal: Visibility of approximately 20 km, with slight shimmer and moderate wind.
Good: Visibility of approximately 40 km, overcast, with no shimmer and moderate wind.
40
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