This is my first post on here and of course it starts with a question. Sorry about that. I did a resection today from two known good points that I have used before and came up with an 8 tenths bust, which I came up with after trying numerous attempts with the same setup. The distance was no more than 300ft. I was using a Trimble S6 with a TSC3 controller and the backsight was a SECO -40 nodal prism and the other a Trimble MT100 multitrack prism. I brought out a level and found thousandths between the two points which I was resecting from. Unfortunately I made two changes at one time and the problem corrected itself. The only changes I made was rebooting the TSC3 controller and using the MT100 multitrack prism for both points for the resection. One of these fixed the problem. After completing the resection I restarted the survey using the nodal prism for my backsight and it checked ok. This points me towards the TSC3 controller but that sounds "iffy". Of course the boss does not want to spend the money to have it properly checked.
Anyone run into this before? The only other problem I have had with the Trimble S6 is it for sure being locked onto "prism 2" and showing that but the audio saying "prism 1 locked". She lies.
Thanks in advance and great to be on the site.
Brian
Chevy Chase comes aboard???
Nice choice for a pseudonym.
You cannot trust two point resections in access if you are much closer to one of the points than the other. This is also detailed in the resections portion of the user manual for access.
Was this the case? I usually try to use a minimum of three.
Also, you probably had to key in a custom prism for the -40mm setup so this may not be a problem, but make sure the measure-up wasn't set to bottom notch or vice-versa.
Not the best triangle I have used but I still resected from the same spot after making the other changes and it worked just fine and I checked into another point after finishing the resection and it looked ok too. Thanks for the quick replies.
Yeah, the bottom notch vs other measure up location was my first thought too but that was not the case.
I have the same equipment and do resections frequently. The mistake I have made is not checking “Bottom of Notch” verses other choices for the height of instrument.
I like to measure to the + on the S6, another guy who uses my gun likes to measure to the bottom of the notch, which is lower, he changes that setting on me and I have forgotten to look at it. Off the top of my head, I think this causes a 0.50’ error in elevations.
With Trimble robotics (even with activetrack) you have to be VERY careful about other holographic or prism-like objects near line-of-sight to the prism. A common problem for me was construction workers' safety vests. If they come close to line, sometimes even momentarily, they can pull the robotics off-center to the prism and corrupt the observation.
Also have to watch: stop signs (especially flaggers), brake lights, some logo stickers, etc.
You probably already know that, but sometimes when doing something like resecting you can get "sucked in" to the data collector and forget to look up.
Yup
Had me some trouble today with Access lieing about which prism the S6 was locked onto while measuring rounds where the foresight and backsight were only a couple of degrees apart from the guns perspective. One, the backsight, a passive Seco prism and the other the multitrack. Having the two prisms fairly close to the same line from the guns perspective played a part I suspect. Thankfully I checked the shot and discovered it to be bogus. Access apparently lied as to which prism it was locked onto.
Just because I'm paranoid doesn't mean they aren't out to get me.
Just because I'm paranoid, doesn't mean they aren't out to get me.
> You cannot trust two point resections in access if you are much closer to one of the points than the other. This is also detailed in the resections portion of the user manual for access.
>
> Was this the case? I usually try to use a minimum of three.
Hi, I'm not aware of the reason for this and I can't find any reference to it in the manual?
Access/S6 doesn't do well with prisms close together from the instrument's perspective.
I have had to turn sets to one, turn it, aim the second one and turn angles to the second one.
It also will pick up my vest sometimes but it never gets a distance (in track mode). Sometimes something will confuse it and it will suddenly look up off at some odd angle.
99% of the time it works fine, though. The Leica 1203 I used was just aggravating all the time, long pauses, it hated traffic, couldn't do an automatic set with traffic because it would pause for minutes then when it finally was ready again a truck would get it in it's way. I would have to do it manually so I could fire when the target was open. The S6 doesn't do that, it just tries again.
finelock is a trimble feature that enables shots on prisms closer to other prisms. gives it tunnel vision.
it's available on the S8 but not on the S6. I am seriously considering an upgrade to an S8 for this feature.