KOBB LM50A Laser Rangefinder User Manual

KOBB LM50A Laser Rangefinder

Product Overview

Safety Instructions

Before using this product, please read thoroughly and comply with the Safety Instructions. Failure to read and follow may void the warranty. This document must be kept in a safe place and if the laser device is passed on, this document must be passed on with it.

WARNING!
CLASS II LASER PRODUCT COMPLIES WITH CFR 1040.10 AND 1040.11.­ Max. Power Output: <1 mW Wavelength: 630nm-670nm
LASER RADIATION:
DO NOT STARE INTO BEAM. DO NOT DIRECT EYE EXPOSURE.  AVOID VIEW WITH OPTICAL INSTRUMENTS.

ATTENTION: Read all instructions prior to operating this laser tool. Do not remove any labels from tool.

• While the product is in operation, be careful not to expose your eyes to the emitting laser beam (Red light source). Exposure to a laser beam for an extended time may be hazardous to your eyes.
• Do not attempt to view the laser beam through optical tools such as telescopes as serious eye injury may result.
• Do not disassemble or modify the laser in any way. Modifying the tool may result in hazardous Laser Radiation Exposure.
• An exposure to the beam of a Class 2 laser is considered safe for a maximum of 2 seconds. Eyelid reflexes will normally provide adequate protection.
• Reflective, specular or shiny surfaces must be covered whilst laser devices are in operation.
• In public areas shield off the laser beam with barriers and partitions wherever possible and identify the laser area with warning signs.
• Do not operate the laser around children or allow children to operate the laser. Serious eye injury may result.
• The following label /print samples are placed on the product to inform of the laser class for your convenience and safety.

Battery

• The product is equipped with 3.7V/850mAh lithium-ion battery which is built-in and non-removable.
• Please charge it if it can’t be turned on or there is no power indication after starting up. When the device runs out of battery, the battery icon will be displayed and flashing.
• Please use the charging adapter with DC 5V and 1A to charge it, the charging port is the micro USB port. (It is recommended to use a phone charger).
• The battery icon will be displayed in a scrollable way during the charging process. The battery icon will be displayed and flashing when the charging process is completed.
• When not in use for a long time, please fully charge the device and recharge it once every six months to avoid battery discharge damage.

Start the lnstrumenUMenu Setting VII

Turn ON/OFF the Instrument

• Turn ON: Press the button to start the device. Press the button again, the laser starts and stands by for measurement.
• Turn OFF: Long press button for 3 seconds to turn the device off. The device can also be shut off without any operation within 150 seconds.

Unit Setting
Long press button for 3 seconds to enter the measurement unit adjustment state, which can reset the current measurement unit. The default unit is O.OOOm. There are 6 units for selection.

Units:

• Changing Reference Point
  Press to change the reference point. There are three reference points, the end, the middle and the front. By default, the device reference point is the end.

• Delay Measurement
  Long press for 3 seconds to open the delay measurement mode and the screen will display “SEC”.The default delay time is 5 seconds, which can be adjusted by or (Adjusting range: 3 to 60s).
  Press to start the countdown. The countdown ends and the measurement begins.

• Backlight ON/OFF
  The backlight turns on and off automatically. The backlight can be on for 15s while operating, and it will be shut off automatically if without any operation over 15s.

• Sound ON/OFF
  Long press for 3 seconds to turn ON/OFF the buzzer.

Self-Calibration

This function can keep the precision of the device.
Instruction: Under the status of power-off, keep pressing button and do not release it, and short press button during this period. Release button until “CAL” and a blinking figure show on the screen. The user can adjust the figure with button according to the accuracy of the device (Adjusting range: -9 to 9mm). Press button to save the calibration result.
For example: the actual distance is 3.780m
If the measured value is 3.778m, which is 2mm less than the actual value, the user can enter the calibration mode and press the button to increase the calibration value by2mm. If the measured value is 3. 783m, which is 3mm larger than the actual value, the user can enter the calibration mode and press the button to lower the calibration value by 3mm. After the adjustment is completed, press the button to save the calibration results.

Measurement & Calculation

Angle Measurement
The angle information is displayed on the top of the screen, and the angle measurement range is -90.0° to 90.0°.

Single Distance Measurement:
Short press to turn on the laser beam under measuring mode. Press the button again for single measurement of length, then the measured results will be displayed in the major display area.

Continuous Measurement:
Long press button for 3 seconds under measuring mode and enter into continuous measuring mode. The maximum and minimum result display in the auxiliary display area, and the present result displays in major display area. Short press button or to exit continuous measuring mode.

Area Measurement:

• Press button once, and shows on the top of screen. One of the side of rectangle blinks on the display, please follow the below instructions for area measuring:
• Press once for length
• Press again for width

The device calculates and shows the result in the major display area. The auxiliary display area displays the measured length and width of the rectangle.

• Press to clear off the result and re-measure if necessary.
• Press until there is no data on the auxiliary display area. Press again to exit the current mode and return to the length measurement mode.

Volume Measurement

• Press button twice to enter into volume measurement mode. displayed on the top of screen. Please follow the below instruction for volume measuring:
• Press for length
• Press again for width
• Press thirdly for height

The device calculates and shows the result in the major display area.

• Press to clear off the result and re-measure if necessary.
• Press until there is no data on the auxiliary display area. Press again to exit the current mode and return to the length measurement mode.

Painter Function
When the device is in area mode, user can use the add/ subtract function to total up the area of several surfaces.

• Press button three times till show in the display.
• Press to measure the height of the wall first (H);
• Press to measure the bottom edge of the first wall (L,), get the first area in the major display area;
• Press to measure the bottom edge of another wall (L,), get the sum of these two walls.

Repeat these operations for more walls.

• Press to clear off the result and re-measure if necessary.
• Press until there is no data on the auxiliary display area. Press G again to exit the current mode and return to the length measurement mode.

Indirect Distance Measurement/ Pythagoras Measurement

•  There are four modes for measuring the unilateral distance of a triangle by using the Pythagorean theorem. It is convenient for users to make indirect measurement in a specific complex environment.

• The indirect distance measurement is used to measure distances that cannot be measured directly because an obstacle would obstruct the laser beam or no target surface is available as a reflector. Correct results are achieved only when the right angles required for the respective measurement are exactly adhered to
  (Pythagorean Theorem).

• Pay attention that the reference plane of the measurement (e.g. the rear edge of the measuring tool) remains exactly at the same location for all individual measurements within a measuring sequence.

Note:

1. Indirect distance measurement is always less accurate than direct distance measurement. Depending on application, greater measuring errors are possible than with direct distance measurement. To improve the measuring accuracy, we recommend using a tripod .

2. In the Pythagorean theorem modes, legs must be shorter than hypotenuse, or there will be “Err” shows on screen. In order to guarantee the accuracy, please make sure all measurements start from the same point.

3. Calculate the second side by measuring the hypotenuse and another side.

4. Short press four times till the hypotenuse of is blinking on the screen.

5. Press and the auxiliary display area from top to bottom shows the length of the hypotenuse (a), angle (a) and length of the base-side (b ). The main display area shows the height (h).

6. Calculate the hypotenuse by measuring the length of two legs. Short press five times till the one leg of is blinking on the screen.

   • Press measure the length of one leg (a)
   • Press measure the length of another leg (b)
     The device calculates the length of hypotenuse (x).

7. Short press six times till the one side of is blinking on the screen.

   • Press , measure the length of one side (a)
   • Press , measure the length of the median line (b)
   • Press , measure the length of another side (c)
     The device calculates the length of one side of the triangle (x).

8. Press seven times till the hypotenuse of  is blinking on the screen.

   • Press , measure the length of one hypotenuse (a)
   • Press , measure the length of height (b)
   • Press , measure the length of one side (c)
     The device calculates the length of one side of the triangle (x).

Addition / Subtraction
The device can be used for addition and subtraction. Press  to select the function once get the length measuring result.

• Short press , “ + ” shows in the major display area, entering addition mode. Value of last measurement and the result of summation will be shown on the screen.
• Short press , “ – ” shows in the major display area, entering subtraction mode. Value of last measurement and the result of subtraction will be shown on the screen.
  Area and volume can also be added and subtracted. Take the area as an example: Area addition function:

1. Step 1: Measure the first area as shown in PIC1.
2. Step 2: Then press button , there will be a “+” in the left bottom of screen, measure the second area as shown in PIC2.
3. Step 3: At last, press button to get the summation result of these two areas datas which shows in PIC3.

Record Function

• Long press button for 3 seconds to record your measuring result under measuring mode.
• It can also record the result under Area, Volume and Pythagoras mode. All the calculating records can be saved by the device.
• When the storage is full, the screen will display the mark. (Max storage: 30 units)

Read/ Delete the Record:
Short press button , read the records by press button  . Short press to delete recent record and long press for 3 seconds to clear up all the records. Press or to exit record mode.

Working Advice

General Information
The reception lens and the laser beam outlet on the top of the device must not be covered when taking a measurement. The measuring tool must not be moved while taking a measurement (with the exception of the continuous measurement function). Therefore, place the measuring tool, as far as this is possible, against or on a firm stop or supporting surface.

Influence Effects on the Measuring Range
The measuring range depends upon the light conditions and the reflection properties of the target surface. For improved visibility of the laser beam when working outdoors and when the sunlight is intense, shade off the target surface.

Influence Effects on the Measuring Result
Due to physical effects, faulty measurements cannot be excluded when measuring on different surfaces. Included here are:

• Transparent surfaces (e.g., glass, water),
• Reflecting surfaces (e.g., polished metal, glass),
• Porous surfaces (e.g. insulation materials),
• Structured surfaces (e.g., roughcast, natural stone).

Furthermore, faulty measurements are also possible when sighting inclined target surfaces.
Also, air layers with varying tomporaturos or indirectly received reflections can affect the measured value.

Accuracy Check of the Distance Measurement
The accuracy of the measuring tool can be checked as follows:

• Select a permanently unchangeable measuring section which is approx. 9.8 to 32 fl (3 to 10 m) long and which you know the exact length of (e.g. room width, door opening). The measurement should be performed under favorable conditions, i.e. the measuring section should be indoors with weak backlighting and the target area of the measurement should be smooth and reflect well (e.g. a while-painted wall).
• Measure the distance 10 limes in succession.
  The deviation of the individual measurements from the average value must not exceed ±0.12 in. (±3 mm) over the entire measuring section in favorable conditions. Record the measurements in order to be able to compare the accuracy at a later date.

Working with the Tripod
The use of a tripod is particularly necessary for larger distances. Position the measuring tool with the 1/4″ thread onto the tripod with 1/4″ mounting screw. Tighten the measuring tool.
Set lhe corresponding reference level for measurement with a tripod by pushing button (the reference level is the thread).

Tips

Users may get some warning information as below:

Specifications

Note: Use a target plate to increase the measurement range during daylight or if the target has poor reflection properties.

Typical Tolerance: ±2mm (±1/16 inch), when reflectivity 100% (white surface), environment light <2000 LUX, 25 °C (77 ·p ). Tolerance is usually affected by distance, reflectivity, and environment light etc. It probably gets tolerance around ±(2mm+0.2mm/m) / ±(1/16 in.+1/64 in. /ft.)

Instrument Maintenance

• The device should not be stored in a high temperature and strong humidity environment for a long time; if it is not used very often, please take out the battery and place the device in the allocated potable bag and store in cool and dry place.
• Please keep the device surface cleaning. A wet soft cloth is applied to clean dust, but erosion liquid is never allowed to use for the device maintenance. Laser output window and its focus lens can be maintained according to maintenance procedures for the optical device.

Warranty

The laser tool passed rigorous and comprehensive product inspection. We are confident of the quality of our products and offer outstanding guarantee for professional users of the products.
We offer One Year Limited Warranty from date of purchasing provided that:

• Proof of purchase
• Fair wear and tear
• Have not repaired by unauthorized persons
• Has not been misused

Defective products will be repaired or replaced, free of charge or at our discretion, if sent together with proof of purchase to our authorized distributor(s)

This Warranty does not cover:

• Faults caused by accidental damage
• Failure to use according to manufacturers’ instructions
• Defects caused by maintenance or renovation without our authorization
• Calibration and care are not covered by warranty

Note:

• To the extent permitted by law, we shall not be liable under this Warranty for indirect or consequential loss resulting from faults in this product.
• Repair or replacement under this Warranty does not affect the expiry date of the Warranty.
• This warranty is limited to purchased customers, and is not permitted to transfer this warranty to other third parties.
• This Warranty may not be varied without our authorization.

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