[ Measurement Range and Zero-Point ]
The instrument can be set to display a reference point of "0" at any angle using the 0-
Cal and 1/2-Cal buttons.
However, the measuring range of the instrument is limited by the range of the
internal variable measured by the device. (This value can be seen when power is first
turned ON, before changing the reference point.)
Instrument does not have an internal reference to true horizontal.
The zero reference when power is first turned on does not necessarily show true
horizontal.
When an absolute reference to horizontal is needed, the zero-point must be set each
time power is turned on.
In this way, the zero-point is accurate with each use with the advantage that any error
due to drift in the zero-point is eliminated.
Refer to the section "Zero-Point Setting" below and follow the 0-Cal and 1/2-Cal
procedures to set the zero-point.
The measurement range of the instrument is limited by two factors. The sensor
operating range for what angles can be detected is ±8mm/m around it's internal zero-
point. The range of the display is ±5mm/m. The instrument measurement range of
±5mm/m is limited by both these constraints.
The following diagrams represent these two measurement ranges for various
conditions. The internal measurement range is shown on the number line at the top
of each diagram, and the displayed range shown below.
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