Page 42 - Lehrbuch Neigungsmessung deutsch 2018.indd

COMPENDIUM INCLINATION MEASUREMENT
WYLER AG, WINTERTHUR / SWITZERLAND

6.2 MEASURING INSTRUMENTS WITH CAPACITIVE MEASURING SYSTEM

6.2.1 MEASURING PRINCIPLE:
The electronic levels with a capacitive measuring system are based on the measuring values on the
pendulum properties of a friction-free supported disc
weighing less than 1 gram. A two-phase frequency
(4.8 kHz) is supplied to two electrodes which, together 1: KERAMIK-ELEKTRODEN
with the pendulum disc supported in the shielded and 2: PENDEL
dustproof gap between them, build a differential capa-
citor. The inclination signal is created at the pendulum.
Due to the perfect rotational symmetry of the sensor,
inclinations perpendicular to the measuring axis are of
insignificant influence to the measurement, and even
overhead measurements are possible. The shielded Die rotations-
sensor and the capacitive measuring principle make symmetrische
the system impervious to magnetic and electric fields. Massescheibe, das
eigentliche Pendel.
With this pendulum system, extremely accurate re-
sults regarding repetition and hysteresis, combined
with very short reaction times, have been achieved.
Advantages of capacitive measuring systems:
• Shield against magnetic and electrical influences
• Very resistant to heavy acceleration and shock since the deflection of the pendulum is limited to a
maximum of 0.3 mm
• Excellent rotational symmetry, due to the shape of the membrane

The concept of the measuring cell is used for handheld instruments as well as for the inclination measu-
ring sensors. The different measurement systems differ only in the interpretation of the measured signals.
We distinguish between analog and digital interpretation.

6.2.1.1 THE ANALOG MEASURING PRINCIPLE

The measuring principle is used in handheld instruments such
as the BlueLEVEL.
Advantages of the analog measuring principle:
• The analog measuring principle is optimized for the
measurement of straightness, flatness, etc. with handheld
instruments because this measurement principle provides
a stable value very quickly, which is very important for
precise measurements and an efficient measurement pro-
cess.
• Very insensitive to low-frequency interference, as can
sometimes occur in machine tools.

Page 42