Land Surveyor Forum

Replies

• Seeking Employment

  Emmanuel Onwubuya June 26, 2014 at 2:29pm

  Hello surveyor.. Sarfraz Ahmed is very correct. You need to do some adjustment computation to adjust temperature error in each measurement if temperature varies rapidly or set the temperature constant in the instrument if the temperature varies slightly within a mean temeparature..
  • Seeking Employment

    Emmanuel Onwubuya > Emmanuel Onwubuya June 26, 2014 at 2:30pm

    if temperature outside was 42 degrees  & you need to layout a distance of 50 & you didn't consider the temperature then the error can be calculated by following formula
    0.042*1000m*50=1.5mm
    (diff)/constant*dis=Ans
    • Not a Surveyor

      Al > Emmanuel Onwubuya December 25, 2021 at 9:31am

      i come up with 1.2 what am i doing wrong?

       
• 

  Paul Quagge June 24, 2014 at 9:15am

  Morning, on the same subject, can someone please explain the effects of pressure on a total station? Paul
• Government Professional

  Anuar Aliz March 22, 2013 at 12:15pm

  Unless you are working in an ultra precise network, you can use always the default settings in your TS.

  I would pay more attention to the TS centering and prism level more than pressure and temperature.
  • 

    jazu > Anuar Aliz March 22, 2013 at 3:49pm

    thanks a lot for all
    • 

      jazu > jazu March 22, 2013 at 3:54pm

      dear sarfraz ahmed sir,

      please explain the formula once again. i did not under stand.

      please tell me that how i can check versatility of structure with total station.
• 

  Sarfraz Ahmed March 21, 2013 at 6:29pm

  by default temperature in leica is 12 degree Celsius.

  the influence is 1 degree Celsius = 1ppm (ppm means parts per million)

  1ppm=1mm per kilometer 

  if you didn't consider the out side temperature it may hurt your measurements...

  e.g: if temperature outside was 42 degrees  & you need to layout a distance of 50 & you didn't consider the temperature then the error can be calculated by following formula

  0.042*1000m*50=1.5mm

  (diff)/constant*dis=Ans

  HOPE THIS WILL HELP
• GEO Ambassador

  Jaybird March 21, 2013 at 6:14pm

  In new total stations and levels, the compensator has most often been adjusted at room temperature, so that the line of sight is horizontal even if the instrument is tilted slightly. This situation changes if the temperature fluctuates by
  more than ten or fifteen degrees, after a long journey, or if the instrument is subjected to strong vibration. It is then advisable to inspect the line of sight, particularly if more than one target distance is being used.

   

  The instrument errors change with temperature, as a result of vibration, and after long periods of transport. If you want to measure in just one face, then immediately before the measurements you must determine the instrument errors and store them.

  perhaps some other members might like to elaborate on this..