Surveying Note - Kolida KL-15 User Manual

A precise focusing can shorten the measuring time and improve the accuracy.
Measurement of high accuracy requests precise focusing as well as continuous
measures.
(2) Obstacles
Measurement can be implemented if the staff is blocked less than 30%. Even if the
crosshair center is blocked, as long as the field of view is blocked less than 30%,
measurement still can be implemented. However, in this case, the accuracy might
be affected.
(3) Shadow
The surveying accuracy may be influenced if the staff is covered by shadow. In
some cases, it is not possible to measure.
(4) Backlight
If the background of the staff is too bright, which affects the contrast of the staff,
the digital level might not be able to measure. You can cover something ahead of
the objective lens in order to reduce the background light invading to the lens.
When a strong light comes into the eyepiece, it might not be able to measure
either. You can also cover the eyepiece in order to block the strong light from
coming into the eyepiece.
When the sun is in a low position (for example, in the morning or at night fall), or if
the sun light comes into the objective lens directly, it is suggested to block the
sunlight with hands.

2.7 Surveying Note

In order to make full use of the functions of instrument, please pay attention to the
following:
(1) Set up the staff in bright place. If possible, prolong the staff completely. If
illumination is employed, it is suggested to illuminate the whole staff, otherwise the
accuracy might be affected.
(2) The shortest distance between instrument and staff is 1.5m.
(3) It won't affect the digital level to measure if the staff is blocked. But if the
bar code on the staff is blocked by tree branches or leaves, the digital level might
display error, or the accuracy is influenced.
(4) If an error occurs because the place where the staff is put is darker than
that of the eyepiece, you are suggested to block the light for the eyepiece.
(5) Deflection and pitching of the staff may affect the accuracy. During the
measurement, make sure the staff is paralleled to the vertical hair of the reticle.
The staff should be unfolded completely and fixed well. Make sure the joints of the
staff are well and precise. Avoid to measure through the glass window.
(6) After a long storage or transportation, check and calibrate the digital
and optical sight errors. Then adjust the circular vial and keep the optical parts
clean.