g) Calculate|
（
a1-a2
）
- (b1-b2) |= e
；
f) If e>1.5mm, the instrument accuracy is out of tolerance, and it needs repair.
5.3. Self-calibration adjustment
See as following figure, there are two self-calibration apertures on the instrument, the self-calibration aperture A is
corresponding with the adjustment of fore and aft direction (the checked error in item 2 accuracy self calibration), the
self-calibration aperture B is corresponding with the adjustment of left-right direction (the checked error in item 1
accuracy self calibration).
1) When adjusting, use the
subtense 3mm hexagon spanner.
2) The adjustment of both directions will influence each other. When making fine adjustment in the left-right direction,
there may be changes in fore and aft direction. Also, when making fine adjustment in fore and aft direction, there may be
changes in left-right direction. Accordingly, please repeat the adjustment of both directions when making fine
adjustment.
3) The adjusting screw of self-calibration should not exceed 4 circles (clockwise or anti-clockwise direction).
4) If it can not calibrate the instrument accuracy through the self-calibration aperture adjustment, please contact the
dealer for servicing.
6. Demonstration
Self-calibration aperture A
Self-calibration aperture B
