Measuring instrument base calibration method:
1, first of all, on the ground also a cross (drawing line is not too thick), stand up the tripod, so that the cross on the ground roughly in the tripod seat directly above.
2, the use of the foot screw in a direction of accurate alignment, the point of rotation 180 degrees, to see whether there is a deviation from the center, if there is a deviation but not beyond the small black circle, in general measurements can still be used, if you do precision measurements still need to be corrected.
3, when adjusting, first screw down the spiral cover, with the pointing device to adjust the needle for adjustment, only half of the deviation adjustment, the other half of the foot screw adjustment.
4. Repeat operation 2 and 3 until the base of the measuring instrument is fully centered.
Expanded Information:
Engineering surveying instrument is a kind of surveying instrument, is the Engineering construction planning and design, construction and management phase of the measurement work required for a variety of directional, ranging, angular, altimetry, mapping and photogrammetry and other aspects of the instrument.
1, product use:?
GDF-26 type forced centering base is a dam safety monitoring horizontal deformation base point equipment.
With the line of sight surveyor, all kinds of latitude and longitude, total station or illuminate the surveyor plate with the use of, complete the dam crest line of sight, horizontal displacement measurement or other engineering measurements.
Applicable work scope: deformation observation, landslide monitoring, precision control network and other work base point, displacement point and calibration point installation.?
Complementary instruments: domestic and foreign types of latitude and longitude rangefinder and various types of illumination surveyor, full surveyor.
2, the main technical indicators:?
Model: GDF-26?
Instrument size: 190×190mm?
Instrument width: 190mm?
Basic material: made of high-quality stainless steel; protective cover high-strength plastic plate .
Accuracy: ±0.1mm?
Connection: three grooves, center insertion, metric and imperial bolts, Kern factory series of instruments connection.?
Features: GDF-26 type forced alignment base adopts integral design, made of stainless steel casting, simple appearance, good integrity.
3, measuring instrument base calibration tools required: a pencil, a tripod, a centering device adjusting needle, bubble adjusting needle.
4, appearance and general performance checks:
(1), first of all, remove the counterpoint, observe the appearance of the base and counterpoint and whether there is loose, or even small screws lost.
(2), then put the counterpoint device back, check whether the foot screw is operating normally.
References
Baidu Encyclopedia-Engineering Measuring Instruments
Baidu Encyclopedia-GDF-26 Compulsory Alignment Base