Here is a screen shot from the "Classes" page in Magnet:
This is probably the most complete list I've found that defines each (if there's a good source to learn more about these, please link away:-/ ).
But I have a few questions:
1. What's the difference between "DR" and "1DR"? Compare "Magnet Default" with "Class 1" for example.
2. Why would "Boundary" have only a single direct shot, but yet specify .005 distance precision?
3. What is "Hz (r+l)" and Hz (r-l)? In Class 1, for example, it calls out a 10" Vertical and 10" Horizontal tolerance for a pointing, but 15" for r+l and 8 for r-l.
4. What the heck is H1V0.5? A web search brings up a popular gaming company, lol.
5. And, finally, given a total station with known standard errors of 5" pointing and 7.5" angles, which of these classes would be the best to use to take advantage of the instrument's precision? The general assumption should be that time to take measurements is not a factor (Not like real life, I know).
Classes
The dialog displays the list of the classes for Total Station measurements. Each class has a specified number of measurements of horizontal angle / vertical angle / distance and tolerances of angle and distance measurements:
Num Sets - defines the set number of horizontal angle (HA) measurements. You can select either direct, or single direct and reverse, or multiple direct and reverse measurements of HA from the list.
VA- defines when the vertical angle (VA) will be measured. You can select either vertical angle measurement for direct measurements only, or for first direct and reverse measurements, or for all direct and reverse measurements of HA.
Dist - defines when the distance will be measured. You can select either do not measure the distance, or perform the distance measurement for first direct measurements only, or for first direct and reverse measurements, or for all direct or all direct and reverse measurements.
Num Dist - defines the number of measurements for distance determination. You can select either one, or multiple measurements. Only the first distance measurement is used to calculate the position. The remainder is just recorded.
Hz - defines the tolerance value in the horizontal plane. The field is available for one or more (than one) direct and reverse measurements of the HA.
Hz (r+l) - defines the tolerance value of the of the collimation error in the vertical plane (vertical index error). The field is available for one or more direct and reverse measurements of the HA.
Hz (r-l) - defines the tolerance value of the oscillation of the collimation error in the horizontal plane. The field is available for one or more direct and reverse measurements of the HA.
VA - defines the tolerance value in the vertical plane. This field is available when VA is measured either for one direct and reverse measurements or for all direct and reverse measurements of HA.
Distance - defines the tolerance value for the repeated distance measurements during one set. The field is available when the value of the Num Dist parameter is more than 1.
Dist Sets Dev - defines the tolerance value for the repeated distance measurements during several sets. The field is available when the value in the filed Dist is either 1DR, or D, or RD.
