Hilti PD-I Mode D'emploi page 33

Trapezoid functions can be used, for example, to de-
termine the length of a roof. The Trapezoid function cal-
culates the target distance with the aid of three measured
distances. The Trapezoid with Inclination function calcu-
lates the target distance with the aid of two measured
distances and an angle of inclination.
7.4.1 Trapezoid function (3 distances)
Each step of the Trapezoid function is indicated graphic-
ally in the display. To make use of the Trapezoid function
you require three distances. For example, to determine
the length of a roof, proceed as follows:
1. Select Trapezoid from the group of special func-
tions.
2. Aim the range meter at the target.
3. Press the "Measure" button.
The first distance is measured and displayed in the
intermediate result line.
The graphic display then automatically prompts you
to measure the second distance.
4. Aim the range meter at the target.
5. Press the "Measure" button.
The second distance is measured and displayed in
the intermediate result line.
6. Aim the range meter at the target.
7. Press the "Measure" button.
The third distance is measured, the target length
then calculated immediately and the result displayed
in the result line.
7.4.2 Trapezoid with Inclination (2 distances, 1
angle)
NOTE
For accurate results, calibrate the inclination sensor be-
fore using this function.
NOTE
When measuring an inclination, do not tilt the tool to
the side. To avoid measuring errors when tilted, the
corresponding warning is shown in the display and the
measurement cannot be taken.
Each step when using the Trapezoid with Inclination
function is indicated graphically in the display. In order
to make use of the Trapezoid with Inclination function
you need two distances and an angle. For example, to
determine the length of a roof, proceed as follows:
1. Select Trapezoid with Inclination from the group of
special functions.
2. Aim the range meter at the target.
3. Press the "Measure" button.
The first distance is measured and displayed in the
intermediate result line.
The graphic display then automatically prompts you
to measure the second distance.
4. Aim the range meter at the target.
5. Press the "Measure" button.
The second distance is measured and displayed in
the intermediate result line. The angle of inclination
is measured at the same time.
The target distance is calculated immediately and
shown in the result line.
7.5 Pythagoras functions
NOTE
A reduced level of accuracy, much lower than the level
of accuracy of the tool itself, must generally be expected
when the indirect measuring method is used. In order to
obtain the best results, care must be taken regarding the
geometry of the situation (i.e. right angles and triangle
relationships). Best results are obtained when the tool
is aimed carefully at the corners of the object, when all
points are within the same plane and when the measure-
ments are taken from a location not too far away from
the object.
NOTE
The system checks whether the geometric relationship
allows a result to be calculated. An invalid result, caused
by inadequate geometric conditions, is indicated by a
warning triangle in the result line. In this case, one or
more of the distances must be remeasured.
NOTE
When taking indirect measurements, make sure that all
measurements are taken in a horizontal or vertical plane.
A distance can be measured indirectly by taking several
measurements and the result then calculated using the
Pythagoras rule. The Single Pythagoras method uses a
triangle with two measured distances. The Double Py-
thagoras method uses two adjoining triangles. The Com-
bined Pythagoras method uses the differential between
two triangles.
7.5.1 Single Pythagoras
Follow the symbols in the display. The blinking side of
the triangle indicates the measurement to be taken. When
the required distances have been measured, the result is
then calculated and shown in the result line.
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