ISO 17123-7:2005 pdf free.Optics and optical instruments – Field procedures for testing geodetic and surveying instruments-Part 7:Optical plumbing instruments.
5 Types of optical plumbing instruments
Types of optical plumbing instruments include: instruments using spirit levels; instruments using a compensator; — instruments using two compensators. The spirit level or a single compensator ensures that the line of sight is in a vertical plane only perpendicular to the direction of pointing. The plumb line is the intersection of two vertical planes perpendicular to each other and needs settings and measurements in two perpendicular directions of pointing.
An instrument with two compensators ensures that the line of sight is coincident with the plumb line in any direction. Although the differences of the designs are obvious, only one test procedure shall be used for the different types of optical plumbing instruments.
Optical plumbing instruments are able to sight upwards or downwards or both. The test procedure is the same in all these cases.
The same test procedure is applicable to laser-emitting plumbing instrument, but with an observation means required separately for observing laser spot on the target.
6 Test principle
The test procedure shall be adopted to determine the measure of precision of a particular optical plumbing instrument and its ancillary equipment under field conditions.
The measure of precision of any type of optical plumbing instruments is dependent on the plumbing height. Thus the achievable measure of precision in use is expressed as the relative experimental standard deviation of one component of the point transferred one time over the corresponding plumbing height:
SISO plumb
Furthermore, this procedure may be used to determine:
the measure of precision in the use of optical plumbing instruments by a single survey team with a single instrument and its ancillary equipment at a given time;
the measure of precision in the use of a single instrument over time and differing environmental conditions;
– the measure of precision in the use of each of several optical plumbing instruments in order to enable a comparison of their respective achievable precisions to be obtained under similar field conditions.
Statistical tests should be applied to determine whether the experimental standard deviation, s, obtained belongs to the population of the instwmentation’s theoretical standard deviation, o, whether two tested samples belong to the same population, whether the standard deviation of the x-component is equal to the standard deviation of the v-component and whether the line of sight is coincident with the plumb line.
These deviations of the line of sight do not affect the standard deviation obtained by the test procedure as described in Clause 7.
The same test procedure is applied to laser-emitting plumbing instrument, but with an observation means required separately for observing laser spot on the target.
7 Test procedure
7.1 Test configuration
A rectangular x-v grid as described in Clause 4, shall be established at the plumbing height, h, similar to that of the intended plumbing operation. Figure 1 shows an example of an i-v grid with an interval of 2 mm and a numbering that avoids exchanges of i-v values. This graduated plate shall be levelled approximately and located vertically above or below the mark over or under which the plumbing instrument is centred.
The orientation of the cross hairs of the telescope shall be parallel to the axes of the target plate within the accuracy of setting.ISO 17123-7 pdf download.