| record number: | 86 |
| instrument type: | precise electronic distance meter |
| manufacturer: | Kern |
| serial number: | 218004 |
| model: | ME 3000 |
| weight: | 17.10 kg |
| dimensions (l/w/h): | 46/25/36 cm |
| year of manufacture: | 1979 |
| type of distance meter: | phase-shift principle, middle range |
| precision: | 0.2 mm; 1 ppm |
| range: | 1.5 km with single prism, 2.5 km with three prisms |
| time of one measurement: | 2 to 3 minutes |
| distance reading: | digital, on the display – resolution 0.1 mm |
| light source: | xenon pulse flash-lamp |
| carrier wave: | 485 nm |
| measurement frequency: | 500 MHz |
The ME 3000 phase precision distance meters were first manufactured in 1972. The instrument determines the phase difference with a compensating method by varying the length of the optical path - moving the position of the point of reception of the measuring beam. The standard deviation of the measured distance is 0.2 mm; 1 ppm, making it one of the most precise distance meters of its time. Its range is 2.5 km. The measurement time depends mainly on the operator's skills. The measurement takes between 2 and 3 minutes, depending on the number of measurement frequencies required.
The instrument was used for the highest precision measurements in precision nets. It was also used to establish comparator line bases and base nets. The Faculty bought the instrument in 1979. There were only two such instruments in former Yugoslavia.
The instrument is in the condition it was in when it was originally taken out of service, and few people still know how to measure with it.