Newcon Optik LRB 20000 Principles of Work, Problem Probable reason Solution Description

5. PRINCIPLES OF WORK

5.1.The LRB 20000 assembly (Fig.1) consists of rangefinder 1 mounted on the angular mount 2. The latter is mounted on the tripod 3.

5.2.Rangefinder (Fig.2) is designed for terrain observation and measuring the distance to the closest or next-in range target caught in the beam. It works with the principle of measuring the light pulse round-trip time. The measurement result is displayed in meters on digital range indicator and can be also stored in the computer for further calculations.

The schematic circuit diagram of range finder (Fig.3) shows rechargeable battery (G1), controls switches (S1- S4), pumping and firing elements (ref. designations C1-C3, E1, L1, T1, V1- V2), control circuit board (A1), display circuit board (A2), counter circuit board (A3), and photodetector assembly (A4). Toggle switch S1 is operated to energize the range finder, and toggle switch S4 – to light up the light-emitting diode (LED) H1 which illuminates the reticle pattern.

Button switches S2 and S3 labeled (MEASURE 1) and (MEASURE L) respectively are used to prepare the rangefinder for taking a measurement (by pressing one of those buttons). Button S2 is operated to range the closest target, whereas button S3 is used to engage the next-in-range target caught in the beam.

11.2.The possible problems with the rangefinder are listed below in Table 11.1

		Table 11.1
Problem	Probable reason	Solution
description
1. Picture is blurred	Condensed moisture,	Clean exterior of optical
in the right-hand	dirt on external	parts as directed under
eyepiece	optical surfaces	10.6.2
	Condensed moisture	Dry rangefinder as
	on internal optical	directed under 10.6.3
	surfaces
2. Readiness	Open circuit in the	Clean contacts as
indicator remains	battery section (when	directed under 10.6.1
dark after	standard battery is
MEASURE 1	used)	Replace fuse as directed
(MEASURE L)	Blown fuse in the
button release	protection device	under 11.3.1
	(when vehicle
	electrical system is
	used)	Clean contacts as
	Open circuit in
	battery section (when	directed under 10.6.1
	vehicle electrical
	system is used)
3. Red Low Battery	Unallowably low	Replace the battery with
indicator is on	battery voltage	a newly charged one as
		directed under 11.3.2