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B4 ANGULAR MEASUREMENTS
a) Small angles
The measuring instruments BlueLEVEL and BlueLEVEL BASIC are especially well suited for measuring small
angles. It is however to be considered that the larger the angle is getting, the larger the linearity error of the
instrument is. It is therefore important to level the object to be measured (e.g. surface plate) as good as possible in
both axes.
b) 90°-angle (squareness)
For measuring 90° angles (square angles) instruments with an angular base can best be used. Before starting a
precision measurement the angular error of the instrument must be determined by a reversal measurement on a
suitable object.
After the reversal measurement precision measurement with measuring uncertainty of 3 to 5 µm/m is possible.
The determination of the instrument's angular error is done as follows:
Index of correction = {(C + D)/2} - {(A + B)/2}
In the WYLER LEVELSOFT PRO a new set-up allows the easy measurement of squareness of rectangular
objects.
Principal procedure of a 90° measurement with WYLER LEVEL SOFT PRO
The angular error of the instrument must be determined (optional)
The measurement follows the required set-up (Step length, number of measurements etc.)
After the measurement the respective lines may be adjusted according to different methods. For the following three
methods the angular errors are computed and displayed:
• Method Endpoints
• Method ISO1101
• Method Linear regression (least square)
Ask your local WYLER representative for further information on the software LEVEL SOFT PRO
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