Distance Measurement; Target Setting - Pentax R-422VN Instruction Manual

6. DISTANCE MEASUREMENT

6.1 Target setting

The target mode and its Constant of current setting
are shown at the left of the battery mark. For
example in case of each Constant 0, Reflectorless
(Non-Prism); N 0, Prism; P 0
Pressing [F2] [TARGET] changes the target mode.
• The target mode is changed sequentially as follows.
Reflector sheet - Prism - Reflectorless
• The selected target mode is stored in the memory even if the power is turned off.
So, next time you can use the same mode after turning on.
• The target Constant differs according to the selected target mode. So, confirm the target
mode and its Constant shown at the top screen after changing the target.
[Distance measurement by reflectorless (Non-Prism) mode]
• The measurement range and accuracy of Reflectorless are based on the condition that laser
beam is emitted perpendicular to the white side of the Kodak Gray Card. The measurement
range may be influenced by the shape of the target and its environment. There is a
possibility that the range may vary when the target does not satisfy the conditions above at
survey work.
• Pay attention to the following in case of distance measurement by Reflectorless.
In case of resulting in low accuracy, perform the distance measurement by Prism.
• The CODE number 521 [LONG RANGE MES.] shows ON/OFF.
• The WARNING (Laser Power) screen is displayed when Message ON is selected, and then
[F1] [MEAS] key is pressed.
• Pressing [F1] [MEAS] one time selects "Second MEAS setting" and twice selects "QUIT".
① There is a possibility that correct distance measurement may be impossible by dispersion
or reduction of laser beam when the laser beam comes into the target from diagonal angle.
② There is a possibility that the instrument cannot calculate correctly when receiving
reflected laser beam from forth and back directions in case of measuring the target on the
road.
③ There is a possibility that synthesized values are calculated and the distance may become
longer or shorter than the actual one when the operator measures the target of slope or
sphere or rugged shape.
④ There is a possibility that the instrument cannot calculate correctly collecting the reflected
laser beam from a man or a car that comes and goes in front of the target.
[Distance measurement by reflector sheet mode]
Position the Reflector sheet whose reflecting surface faces the aiming line to be approx.
right angle when the distance is measured by it. If it is positioned not to be approx.
34