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distox [2018/12/10 01:59] – brucemutton | distox [2018/12/19 01:04] – move disto [Troubleshooting Erroneous Measurements] brucemutton | ||
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*Three (successful) shots to the same place means it's a survey leg, and the pda assumes you will now move to that place. | *Three (successful) shots to the same place means it's a survey leg, and the pda assumes you will now move to that place. | ||
+ | ==== Troubleshooting Erroneous Measurements ==== | ||
+ | These are more warnings to be cautious and observant, rather that troubleshooting as such. | ||
+ | ===Battery Changes=== | ||
+ | ALWAYS carry out the accuracy | ||
+ | < | ||
+ | calibrate compass 0.5 # half of largest difference in accuracy test | ||
+ | calibrate clino 0.2 | ||
+ | </ | ||
+ | Think carefully about the sign of the correction! | ||
+ | |||
+ | I have made a spreadsheet to help with this [TO DO post the spreadsheet] | ||
+ | |||
+ | ===Distance=== | ||
+ | We've noticed that spurious distance measurements are more common than we would like, maybe 2% of shots?? | ||
+ | |||
+ | This can manifest a little bit like the sticking of compass or clino (see below) except that the erroneous measurements are usually not identical - so leading you to believe it is a normal measurement discrepancy. | ||
+ | One explanation is that the laser is bouncing off nearby walls. | ||
+ | I suspect this problem is more frequent when the batteries are getting low, down to their last 1000 or so shots (although Beat has assured me that this is unlikely). | ||
+ | |||
+ | ===Compass and Clino=== | ||
+ | Both the compass and clino sensors seem to stick sometimes. | ||
+ | Ferrous objects and magnetic fields will affect the compass of course. |