accuracy of circular level on tribrach

[sako]

Does anybody know what is the range of the circular level in order to affect the measurement accuracy?
I have a Trimble 5603, I took it in for checking of the circular level accuracy versus the internal graphic level. When the bulb is perfectly centered, the graphic level on data collector is off around 1 minute on both directions. I was told by the repair tech that the base unit has been damaged which causes the difference in both levels. He told me deviation of more than 2 minutes will cause significant difference in measurement. I wanted to make sure this is true.

[Stan_K]

Not sure I fully understand your questions.
Most tribrachs have a 10 minute bubble.
The internal leveling on the 5603 is more accurate than the circular bubble.
Easy to check by rotating instrument 180 - level reading shouldn't change more than a few seconds.
The circular bubble on the tribrach is easy to adjust.
Yes, 2 minutes of mis-level does cause significant errors in horizontal & vertical angles.
Not sure what is meant by, "told by the repair tech that the base unit has been damaged which causes the difference in both levels".
Good luck.

Stan

[Jim Frame]

Yes, 2 minutes of mis-level does cause significant errors in horizontal & vertical angles.

Don't the H&V compensators take care of that?

[sako]

Stan, The repair guys said that both levels are OK, I think he checked the tribrach's level separately. He said the only reason why the 2 levels don't match is that the instrument is dropped and the base unit is bent (I don't know how). I know that the instrument is not dropped. He says he tested the gun and everything is OK, just the 2 levels don't match. i have tried the 180 rotation, the readings change is, sometimes near a minute.