Page 14 of 31 Pages
3.2. ZERO-Setting / ZERO absolute and ZERO virtual
Remarks:
Using ZERO SETTING two different tasks can be realized:
a) ZERO ABSOLUTE / The instrument shows "0" when the angle of the mounting surface is exactly
positioned in the direction of the center of the earth.
b) ZERO VIRTUAL / The instrument shows "0" at any predefined angle.
3.2.1. ZERO absolute (with reversal measurement)
The ZERO absolute is the basis for all the inclination measurements in the absolute mode. For such a
measurement if high precision is required, it is of utmost importance that the object to be measured and the
respective sensor are both at the same temperature level. The LEVELMETER 2000 should have been turned on
a few minutes before the measurement procedure. For this procedure a suitable surface must be chosen (rigid,
flat and as horizontal as possible). On this surface the inclination sensor must be placed; the exact position of the
sensor is to be marked on the surface.
Remarks:
Defining the absolute ZERO by means of reversal measurement the
sensor must be
properly mounted on a suitable base.
The ZERO absolute will automatically be set by applying the reversal
measurement. (Taking two measurements on the same spot but in the 180°
opposite direction) For this procedure a suitable surface must be chosen (rigid,
flat and as horizontal as possible). On this surface the inclination sensor must
be placed, the exact position of the sensor is to be marked on the surface.
The „ZERO-OFFSET“ is stored in the sensor head.
EXAMPLE:
The selection pointer of the LEVELMETER 2000 must now be placed
below the marking ZERO by pressing the
ON/MODE key several
times. If the required position is reached, it must be confirmed by pressing
ENTER. On the display the last set „Zero-Offset“ (Basic offset) will be
displayed. The direction indicator (+/-) is flashing.
The sensor must now sit at position one and after a few seconds settling
time allowed, by pressing the key
HOLD, the first reading is collected.
This first value is displayed and the selection pointer below ZERO is
flashing which means the second reading is expected.
The sensor must now be rotated horizontally by 180° and placed exactly
on the same spot. After a few seconds settling time the key
HOLD
must be pressed again for collecting the second reading.
The computed „Zero-Offset“ (Basic offset) is now displayed on the
LEVELMETER 2000.
(The displayed „Zero-Offset“ is calculated by adding the two readings and
dividing the result by two.)
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