Changing The Atmospheric Pressure - Pentax R-2501NS Instruction Manual

• Temperature correction is based on 15° C.
If this instrument is used without correcting the temperature, a distance error per 100m is
about -0.1mm per +1° C as a temperature difference from 15° C.
A distance error per 100m is about 0.1mm per -1° C as a temperature difference from 15° C.
(For more accurate values, See "12.4 Error when no atmospheric correction is made".)

7.3 Changing the atmospheric pressure

The atmospheric pressure setting can be changed only when "ATM CORR" has been set to
"ATM INPUT" in "initial setting 1".
Example: Setting the pressure to 900hPa
Press [F4][CORR] in MODE B.
(If the instrument is in MODE A,
press [F5][MODE] to enter MODE B.)
] to move the cursor to "4.PRESS"
Press [F4][
and press the [F5][SELECT] to enable
the temperature to be changed.
Clear the exiting values by pressing [F5][CLEAR].
Input 900 by pressing the numeric keys.
Press the [ENT] key to accept the
PRESS to 900hPa.
Pressing the [ENT] key returns
the instrument to MODE A.
• The valid range of Pressure input is from 600 to 1120hPa (420 - 840mmHg) .
• When "Atmospheric Correction" in "initial setting 1" has been set to "4. NIL", "*" is
displayed to the left of the pressure value on the correction menu screen.
When "*" is on the screen, the pressure cannot be changed.
If "ATM CORR" in "initial setting 1" has been set to "3.ppm INPUT", no pressure is
displayed on the correction menu screen.
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