33. CHANGING THE SETTINGS
262
If it is not possible to measure the temperature and pressure at the midpoint,
take the temperature and pressure at the instrument station (A) and the
target station (B), then calculate the average value.
Average air temperature :(t1 + t2)/2
Average air pressure :(p1 + p2)/2
• If the weather correction is not required, set the ppm value to 0.
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