Kern e2 theodolite manual11/12/2022 The DM 500 was first shown in 1971 at the Spring Convention of the ACSM in Washington DC. René Nünlist (Chief of Electronics at the Development Section of Kern) manufactured the shell of the prototype of the DM 500 himself from a block of metal during the factory holidays in 1970. This means that the theodolite can be used without interference by cables. The energy is supplied through slip rings on the axes and contact tongues on the telescope. The power is provided through the wiring for the circle illumination, with the battery attached to the stationary base of the host theodolite. The instrument also operates in tracking mode, where the slope distance is displayed every 2 seconds. The standard deviation of one distance measurement is ±(5 mm + 0.000005D), where D represents the distance in km. The maximum range of distance measurement for the instrument is approximately 1.0 km using a single prism, and 1.6 km using a triple prism. The modulation fine measurement frequency is 15 MHz and the power requirement for distance measurement is 11 Watts. The instrument uses a digital phase measuring method with an infrared 900 nm Ga-As-Diode (Gallium-Arsenide-Diode) as radiation source. Both telescopes are small enough to allow the main telescope of the theodolite to rotate through 360° about the horizontal (trunnion) axis. An infrared filter and a diaphragm (for adjustment of the signal strength) is mounted inside the receiver optics. The EDM consists of two telescopes, a transmitting telescope and a receiving telescope with objective diameters of 28 mm each. The adjustment of the distance meter's line of sight (to that of the theodolite) was with the aid of these screws, on the eyepiece side. It is pressed on these screws by springs on the other side. The distance meter slots into holes on the objective side and rests on adjustable screws on the eyepiece side. This Kern DM 501 short-range electro-optical distance meter has the ability to conveniently snap on to the telescope of a Kern theodolite such as the Kern K1-SE scale-reading theodolite as shown in the above images, thus producing a complete all-in-one theodolite and distance measuring instrument (see 0215 for details on the host theodolite). Length 180 mm, Width 70 mm, Height 180 mm
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