Trimble SPS930 Leveling Issues
In need of some help
I am very new to surveying (Been interning at a heavy civil construction company for 4 months now) and am having issues with the Trimble total station (Company purchased it 10 months ago). As the weather has gotten colder (-15 to 0 celsius), the total station drifts out of level very quickly and at a consistent rate. I assumed it was station/tripod expansion or just needed a compensator calibration and have been making sure to give at least two minutes of cool down time per degree difference outside, and a calibration every time with no luck so far. I have also tried ensuring fresh batteries, multiple tripod locations, multiple new tripods (tri-max), and finally disabled the level compensator and setup but still noted substantial drift.
Has anyone dealt with issues like this or have any advice? I want to cross off all potential issues before having it serviced.
Is this possibly a freeze/thaw ground conditions issue? I have had similar trouble in the past with cold weather setups. After a time the sun melts the ground ever so slightly around one or two of the tripod feet. There have been many excellent discussions here with very good tips. I hope some search efforts will help.
Ground thaw is my first guess.
I avoid storing and transporting tripods in a heated area. Immediately after setting up I'll kick snow around the legs if it's available.
Pile snow around each leg before you finish leveling or put each leg on a flat rock or small board