We are equipped and certified to handle most models of all kinds of instruments, such as Topcon, Sokkia, Trimble, Spectra, Nikon, Leica, Northwest, CST Berger, Geomax and many more..

Visit our online store at:

PRISM Surveying & Construction Systems, Inc.

5959 Mission Gorge Rd. Ste.104  Map

San Diego, CA 92120.

Phone 619-283-3137

Mon.-Fri. 8 a.m to 5 p.m.

Beyond Expectations

Robotic Total Stations Calibration and Repair Services

Total Station Instruments are manufactured, assembled and adjusted to the best possible quality. Quick temperature changes, shock or stress can cause deviations and decrease the instrument accuracy. It is therefore recommended to check and adjust the instrument from time to time. This can be done by running through specific measurement procedures. Calibration procedures are guided and

have to be followed carefully and precisely to get the maximum accuracy.


Q: What Model and Make of instruments can you service/Calibrate?


We are equipped and certified to handle most models of all kinds of instruments, such as Topcon, Sokkia, Trimble, Spectra, Nikon, Leica, Northwest, CST Berger, Geomax and many more..




When Should the Calibration Performed?



During the manufacturing process, the instrument errors are carefully determined

and set to zero. As mentioned, these errors can change and it is highly recommended

to redetermine them in the following situations:

• Before the instrument is used for the first time.

• Before every high precision survey.

• After rough or long periods of transport.

• After long periods of work or storage.

• If the temperature difference between current environment and the temperature at the last calibration is more than 10°C (18°F).




What Can of adjustments does Prism S.C. Systems, Inc. Perform on my Instrument?



Electronic Adjustments:

The following instrument errors can be checked and adjusted electronically:

• Horizontal collimation error, also called line-of-sight error.

• Vertical index error, and simultaneously the electronic level.

• Tilting axis error.


Mechanical Adjustments:

The following instrument parts can be adjusted mechanically:

• Circular level on the instrument and tribrach.

• Laser plummet.

• Screws on the tripod.


Line-of-Site error Adjustment

The line-of-sight error, or horizontal collimation error is the deviation from the perpendicular between the tilting axis and the line of sight. The effect of the line-of sight error to the horizontal direction increases with the vertical angle.

a Tilting axis

b Line perpendicular to tilting axis

c Horizontal collimation, or line-of-sight, error

d Line-of-sight






Vertical index error

The vertical circle should read exactly 90° (100 gon) when the line of sight is horizontal. Any deviation from this figure is termed vertical index error. This is a constant error that affects all vertical angle readings.

a Mechanical vertical axis of the instrument, also called

standing axis

b Axis perpendicular to the vertical axis. True 90°

c Vertical angle is reading 90°

d Vertical index error






Tilting Axis error

The tilting axis error is caused by the deviation between the mechanical tilting axis and the

line perpendicular to the vertical axis. This error affects horizontal angles. To determine this

error, it is necessary to point to a target located significantly below or above the horizontal











Laser or Optical Plummet Error

The laser/Optical plummet is integrated into the vertical axis of the instrument. Under normal conditions of use, the laser/Optical plummet does not need adjusting. If an adjustment is necessary due to external influences, the instrument has to be adjusted by an authorized service center



CCD or Automatic Target Recognition (ATR) Error

The determination of the ATR Hz and V adjustment errors.