Display Illumination; Basic Principle; Measuring Principle; Control Panel - Hilti PD 40 Mode D'emploi

2.3 Display illumination

In low light conditions, the display is illuminated automatically as soon as a button is pressed. The display illumination
intensity is reduced to 50% after 10 seconds. If no button is pressed over a period of 20 seconds, the display
illumination switches off automatically.
NOTE
Illumination of the display consumes battery power. Shorter battery life is therefore to be expected when this feature
is used frequently.

2.4 Basic principle

The distance is measured along a laser beam emitted by the tool to the point at which the beam strikes a reflective
surface. The target from which the measurement is taken is clearly identified by the red laser measuring spot. The
range of the tool depends on the reflectance and structure of the target surface from which measurements are taken.

2.5 Measuring principle

The tool emits a visible laser beam carrying signal pulses which are reflected by the target. The time between reflected
pulses is used as a basis for determining the distance.
This measuring principle permits highly accurate and reliable measurement of distances to objects without need for
special reflectors.
2.6 Standard measuring display mode
Standard measuring display mode is always activated when the "On/off" or "Measure" button is pressed to switch the
tool on.
2.7 Symbols in the display
Temperature
Unfavorable conditions, poor signal
General hardware error

2.8 Control panel

On/off button
Measure button
Plus button
Minus button
Area button
Temperature too high
(>+50°C) / too low (<-10°C).
Insufficient reflected laser
light.
Switch the tool off and on again. If the fault persists, please contact Hilti
Service.
When the tool is switched off, press the button briefly to switch it on.
When the tool is switched off, press and hold the button to activate the
menu.
When the tool is switched on, press the button briefly to switch it off.
Activates the laser beam.
Begins distance measurement.
Activates continuous measuring mode (long press, approx. 2 sec.).
Stops continuous measuring mode.
Activates distance and area addition.
Adds distances shown in the standard measuring display.
Adds areas when in area measuring mode.
Activates distance and area subtraction.
Subtracts distances shown in the standard measuring display.
Subtracts areas when in area measuring mode.
Activates area measuring mode.
Allow the tool to cool down or warm up.
Observe the minimum measuring dis-
tance (50 mm from the front edge of the
tool); clean the lenses; take measure-
ments from a different surface or use a
target plate.
en
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