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Table of Contents
Summary of Contents for Laser Optronix EG-LRF 20000
- Page 1 EG-LRF 20000 technical description and instruction manual...
- Page 2 2. DESCRIPTION 2.1. General The EG-LRF 20000 laser rangefinder is a device intended for the use by an individual. The rangefinder can measure ranges from 60 to 20,000 m with an accuracy of 5 m. The maximum range depends on a target size and shape as well as weather conditions, and can exceed 20,000 m in case of good target visibility.
- Page 3 Fig.1. EG-LRF 20000 rangefinder set: 1. Carrying case. 2. Rangefinder. 3. Accumulator battery.
- Page 4 1 – trigger; 2 – MODE operating mode switch; 3 – desiccator with silica gel; 4 - plug to output information on range; 5 -boresight eyepiece; 6– digital display ocular; 7 - ON supply switch; 8 – external power supply and remote trigger plug; 9 – MIN RANGE minimum range (gate) handle ;...
- Page 5 Fig. 2 - External view of rangefinder _)viewed from the eyepiece panel; b) viewed from the front panel. The rangefinder has the following controls: the ON power supply switch; the MODE operating mode switch; the MIN RANGE handle for continuous setting a minimum range (gate) on the eyepiece panel of the rangefinder as well as the trigger on the topside of the rangefinder housing.
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Page 6: Design And Operation
3. DESIGN AND OPERATION 3.1. Principle of operation The rangefinder operates on the same principle as the optical locator. A range is determined by the time of passing of a short invisible laser pulse to a target and back. A short infrared light pulse of high intensity generated by the laser propagates towards a target within a narrow cone. - Page 9 In the transmitting channel a laser pulse reflected from the target goes through the protective glass (5), the receiving/sighting channel objective (4), the prism unit (3) and is focused by the objective in the plane of the photosensitive area of the photoreceiver (2). The prism unit by its beam-splitting coating applied to the facet of one of the prisms divides a laser pulse going through the objective into two portions.
- Page 10 and continues operating until the stop pulse from the photoreceiver stops the count of pulses from the timing oscillator of the time interval meter. The time interval between the start and stop pulses is transformed into the information corresponding to a range to a target in metres that is displayed. Besides the measured range, additional information is shown on the digital display by the LEDs (Fig.5).
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Page 11: Technical Data
Ready indicator Run-down battery indicator (green LED) (red LED) a) Digital display readings in range measurement to one target C-indicator b) Digital display readings when the rangefinder detects a signal reflected from a target gated out by the minimum range setting M-indicator c) Digital display readings when the rangefinder detects a signal reflected from an object behind the measured target... -
Page 12: Directions For Use
4.1. Transmitter Wavelength, µm......1.54 Pulse energy, mJ, ....Pulse width, FWHM, ns....∼ 30 Pump energy, J, no more....Pulse repetition rate, Hz....0.15 Beam divergence (80 % energy),mrad.. 4.2. Receiver Field of view of receiving channel, mrad..........Type of photodiode......Avalanche Ge or PIN photodiode Entrance pupil diameter, mm..... - Page 13 Since the laser head power supply produces high voltage that is a threat to human life, it is categorically prohibited to disassemble the housing of the rangefinder when there is an accumulator battery. 5.2. Measurement procedure 1) make sure that the MIN RANGE handle is set to the extreme left position or to a required minimum range value (see 5.3);...
- Page 14 The arrangement for minimum range setting is designed to facilitate identification of individual signals reflected from targets and other objects in the path of the laser beam. By using this arrangement an operator is able to not receive (i.e. reject) signals reflected from objects within a given minimum range (gated range).
- Page 15 Controls position MODE MIN RANGE Digital Notes switch handle display readings ≤ 60 2200• Target 2200 m. There is a target behind the displayed one (3500 m) 2250 Target 3500 m. There is a •3500• target behind the displayed one (4200 m) and a target within the gate (2200 m) 3550 Target 4200 m.
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Page 16: Maintenance
5.4. Measurement of range to the last target If a target to be measured is overlapped by close targets, the signals from which come to the rangefinder, and there is no object within the transmitter beam behind the target (i.e. the reflected signal from this object does not come to the rangefinder), then a range to such a target is the easiest to be measured in the last target measurement mode (the L mode). - Page 17 charger lights; - charge time of the discharged battery is 14...14.5 h; - disconnect the charger from the rangefinder. 5) after long-duration interval in operation with the rangefinder (more than one month) it is necessary to carry out training of the energy storage capacitor of the head supply unit.
- Page 18 Appendix 1 DESIGNATION OF PINS OF RANGEFINDER EXTERNAL PLUGS 1. The plug to connect the external power supply and the remote trigger button - an external supply voltage of 12±2 V is applied to the pins 1,4 of the plug; - the remote closure trigger button is connected to the pins 2,3 of the plug;...
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Page 19: Acceptance Certificate
Circuit ACCEPTANCE CERTIFICATE Product: Hand-held laser eye-safe rangefinder Model: EG-LRF Serial number______________ Name of parameter Permissible Actual values values Maximum range, m, no less 10,000 Minimum range, m, no more Minimum range setting, m 40...4500 Time of rangefinder readiness for measurement, s, no more The product conforms with the technical requirements and is fit for operation.