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4-1
4 DISTANCE MEASUREMENT
4 DISTANCE MEASUREMENT
zPrism mode and Non-prism mode
You can select measurement mode between Prism mode which collimating a prism and Non-prism
mode that is collimating a target object except prism.
zRegardless of whether the laser pointer is used, measurement is possible with both the non-prism
mode and the prism mode. That is, when the GPT-3100N is used in the open air, in an urban area,
etc., the laser pointer can be stopped and distance measurement then conducted, making it
possible to prevent the laser light from hitting a third party.
zWhen using a reflection sheet, measure with the prism mode.
zFor measurement with a prism, be sure to measure with the prism mode. If you measure with the
non-prism mode, accuracy cannot be guaranteed.
zNon-prism mode enables all distance measurements such Distance measurement, Coordinate
measurement, Offset measurement and Layout.
zTo switch over Prism mode to Non-prism mode or contrary, press the [NP/P] soft key in each
measurement display. [NP] of Non-prism mode indicator will be shown at the right corner of the
display in Non-prism mode measurement.
Changing mode shall be done before measurement.
zIt is possible to set Non-prism mode for distance measurement during the power on time. Refer to
16.SELECTING MODE to set the option.
zIf happened collimating the near distance prism in Non-prism mode, measurement will not be done
because of too much light.
4.1 Setting of the Atmospheric Correction
When setting the atmospheric correction, obtain the correction value by measuring the temperature
and pressure. Refer to Section 12.2 “Setting of Atmospheric Correction Value”.
4.2 Setting of the Correction for Prism Constant / Non-prism Constant
Topcon’s prism constant value is 0. Set correction for prism at 0. If the prism is of another manufacture,
the appropriate constant shall be set beforehand. Refer to Chapter 11 “SETTING THE PRISM / NON-
PRISM CONSTANT VALUE”. The setting value is kept in the memory even after power is off.
Note: Those distance shorter than 1m and 500m or more will not be displayed in Non-prism
mode.
Note: Confirm that Non-prism correction value is set at zero before measurement target such
as a wall in Non-prism mode.
Example
HR: 120°30'40"
HD* 65.432 m NP
VD: 12.345 m
MEAS MODE NP/P P1
N: 120.456 m
E: 34.567 m NP
Z: 12.345 m
MEAS MODE NP/P P1
Distance measurement mode Coordinate measurement mode
Non-prism
mode
indicator
To change the mode, press the [NP/P] soft key in each measurement.
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