Face left and face right and large delta Horizontal angles
All right guys
I was told that there is no such thing as a stupid question so here goes!
I use a Trimble S7 3 second Total Station with the large Leica round prisms for control. I usually do 3 rounds of angles on each set up with autolock on.
I’ve noticed recently (maybe its just starting happening or I just started noticing it) that sometimes the delta angles are large. Please see below – stn98 was a short backsight (no choice I’m afraid) of 15 ft and stn4 was a long foresight of about 150ft. So the delta horizontal angles on the short back sight station were nothing and the delta horizontal angles to the long foresight are large. I’ve noticed that sometimes the delta HAs to a long backsight are small and the delta HAs to a short foresight are large. It seems to happen when one of the stations is a short distance away.
Is this normal or do I need to consider re-calibration. When both stations are a long distance away everything seems fine.
Cheers, Andrew
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