I don't like the method that Topcon MAGNET Field uses to check angle sets. Our HA tolerance is set to 5 seconds. According to MAGNET Field my angle set failed. I say it passed.
My method for checking this angle set is:
BSD 44 0?ø00'00"
FSD 47 350?ø16'35"
FSR 47 170?ø16'34"
BSR 44 180?ø00'06"
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BSD 44, 00" - BSR 44, 06" = 06"
FSD 47, 35" - FSR 47, 34" = 01"
06" + 01" = 07" / 2 = 03.5"
03.5" is within my HA tolerance.
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tolerances are specified outer limits of acceptability.
The outer limits of your angle sets are 7 seconds. I wouldn't want the software to treat the specified tolerances any differently. When you average your outer limits you deviate from the meaning of tolerance. The purpose of tolerance is to avoid having outliers influence the average.
tolerances are specified outer limits of acceptability.
I never thought of it that way. I thought I was specifying the maximum deviation from the mean. This way of analyzing an angle set is different from the way we used to do it years ago. Would you say that it's more of a statistical approach? Would you say that it's the best approach?
The difference in the BS is 6" observed and the tolerance is set at 5". I think it may be trying to tell you something.
The difference in the BS is 6" observed and the tolerance is set at 5". I think it may be trying to tell you something.
It may be trying to tell me that I may not have pointed to the center of my target with my instrument in the BSD position. It could also mean that I may not have pointed to the center of my target with my instrument in the BSR position. If my FSD position and FSR position were the same, then a difference in BSD and BSR of greater than five seconds would generate an out of tolerance warning. Keeping that in mind, I could simply check my BSR angle on the instrument and decide whether or not to start the set again. I'm not going to do that.
okee dokee
okee dokee
Thanks for the discussion, Norm. I enjoyed it.
