[ ZERO-POINT SETTING ]
The Sensor does not have a preset absolute zero-point.
When the Display is first turned on, a reading of zero will not necessarily indicate that
the gauge is at true horizontal position. If a zero-point is required, it must be set each
time the Display is switched on.
In this way, calibration error is eliminated and the zero-point is set accurately each
time.
Setting the zero-point to true horizontal is accomplished using the 0-Cal and 1/2-Cal
Operations.
Zero-point can also be set using the 0-Cal, 1/2-Cal adjustment procedure on
the Gauge. A zero-point can not be set if the reference plane is beyond the
adjustment range. In that case, please adjust the surface to reduce the slope
to within the adjustment range for setting the zero-point.
A
）
For comparing relative slope of different surfaces.
（１）
Place the Sensor on the surface to be used as the reference.
（２）
When the display has settled, press the 0-Cal Switch to set the display to zero.
A relative zero-point has now been set for use in comparative angle measurements
B
）
If there is a true horizontal reference surface available.
（１）
Place the Sensor on the surface to be used as the reference.
（２）
When the display has settled, press the 0-Cal Switch to set the display to zero.
Zero-point has now been set for absolute measurements.
C
）
If surface is not known to be level.
（１）
Place the Sensor on the surface to be used as the reference.
（２）
When the display has settled, press the 0-Cal Switch to set the display to zero.
（３）
Rotate the Sensor 180° in the same spot on the surface.
（４）
When the display has settled, press the 1/2-Cal Switch to divide the display
reading by 1/2.
Zero-point is now set at true horizontal.
The display will show the absolute tilt of the surface the instrument is on.
The zero-point is now set. However, if the reference surface is not level in the roll
direction (perpendicular to the measurement axis,) there is a possibility of
introducing some error to the measurement so make sure the surface is first leveled
to reduce roll.
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