CEM LDM-100 Laser Distance Meter User Manual

Content

• 1. Safety Instruction
• 2. Start-Up
• 3. Initial Operation and Setting
• 4. Measuring
• 5. Functions
• 6. Technical Data
• 7. Troubleshooting – Causes and Corrective Measures
• 8. Measuring Conditions
• 9. Labelling

1. Safety Instruction

Permitted Use

• Measuring distances
• Computing functions, e.g. areas and volumes

Prohibited Use

• Using the instrument without instruction
• Using outside the stated limits
• Deactivation of safety systems and removal of explanatory and hazard labels
• Opening of the equipment by using tools (screwdrivers, etc.), as far as not specifically permitted for certain cases
• Carrying out modification or conversion of the product
• Use of accessories from other manufacturers without the express approval of CEM Technology.
• Deliberate or irresponsible behavior on scaffolding, when using ladders, when measuring near machines which are running, or near parts of machines or installations which are unprotected
• Aiming directly into the sun
• Inadequate safeguards at the surveying site (e.g. when measuring on roads, construction sites, etc.)

Laser Classification

The CEM produced a visible laser beam which emerges from the front of the instrument.

Laser Class 2 products:

Do not stare into the laser beam or direct it towards other people unnecessarily. Eye's protection is normally afforded by aversion responses including the blink reflex.

[!] WARNING:

Looking directly into the beam with optical aids (e.g. binoculars, telescopes) can be hazardous.

Precautions: Do not look directly into the beam with optical aids.

[!] CAUTION:

Looking into the laser beam may be hazardous to the eyes.

Precautions: Do not look into the laser beam. Make sure the laser is aimed above or below eye level.

2. Start-Up

Inserting/Replacing Batteries

Refer to Figure A for battery compartment details.

1. Remove battery compartment lid.
2. Insert batteries, observing correct polarity.
3. Close the battery compartment again.

• Replace the batteries when the symbol " " flashes permanently in the display.
• Use alkaline batteries only.
• Remove the batteries before any long period of non-use to avoid the danger of corrosion.

Figure A Description: Shows the laser distance meter with the battery compartment lid being removed or closed.

Keypad

Refer to Figure B for keypad layout.

• 1 - [ON/MEAS] button
• 2 - [Area/Volume] button
• 3 - [Indirect measurement] button
• 4 - [Single/Continuous Distance measurement] button
• 5 - [Plus (+)] button
• 6 - [Minus (-)] button
• 7 - [Storage] button
• 8 - [Reference] button
• 9 - [Illuminating/UNITS] button
• 10 - [Clear/Off] button

Figure B Description: Illustrates the keypad of the laser distance meter with numbered buttons corresponding to their functions.

3. Initial Operation and Setting

Switching On and Off

Press the [ON/MEAS] button to switch on the instrument and laser.

Press and hold the [ON/MEAS] button longer to switch off the instrument.

The instrument switches off automatically after three minutes of inactivity.

Clear Button

Pressing the [CLR] button cancels the last action or clears the data display.

If in History storage mode, pressing the [Storage] button and [CLR] button simultaneously will clear all stored data in the memory.

Reference Level Setting

Refer to Figure D for reference level setting.

The default reference setting is from the rear of the instrument.

Press the [Reference] button to change the selection to the front edge.

A special beep sounds whenever the reference setting is changed.

After a re-startup, the reference returns automatically to the default setting (rear reference).

Figure D Description: Shows the laser distance meter with an arrow indicating the change in reference point from rear to front.

LCD Display

Refer to Figure C for LCD display details.

• 1 - Laser active indicator
• 2 - Reference level (front) indicator
• 3 - Reference level (rear) indicator
• 4 - Variable measuring functions indicator (Area measurement, Volume measurement, Indirect measurement, Indirect (second) measurement)
• 5 - Single distance measurement indicator
• 6 - Battery status indicator
• 7 - Historical memory indicator
• 8 - Instrument error warning indicator
• 9 - Continuous measurement & Max and Min measurement indicator
• 10 - First value display line
• 11 - Second value display line
• 12 - Summary line for last measure or calculation result

Figure C Description: A diagram of the LCD screen showing various indicators and display lines with corresponding numbers.

Display Illumination and Unit Setting

Display Illumination

Clicking the [Illuminating/UNITS] button switches the display illumination on or off. This function is useful in darkness situations, ensuring the value is clearly visible on the LCD.

Distance Unit Setting For Instrument

Click and hold the [Unit] button to change the unit type (e.g., m, ft, in, ft+in). Continue clicking the button to cycle through the available unit selections.

4. Measuring

Single Distance Measurement

Press the [ON/MEAS] button to activate the laser.

Press the [ON/MEAS] button again to trigger the distance measurement. The measured value is displayed immediately.

Continuous Measurement (Tracking) & Max and Min Measurement

Refer to Figure E for continuous measurement.

The continuous measurement function (tracking) is used for transferring measurements, for example, from construction plans.

In continuous measurement mode, the measuring tool can be moved to the target. The measured value is updated approximately every 0.5 seconds on the third line. The corresponding minimum and maximum values are displayed dynamically in the first and second lines.

For example, a user can move from a wall to the required distance, while the actual distance is read continuously. For continuous measurement, push the [MAX/MIN] button until the indicator for continuous measurement appears in the display.

Press the [ON/MEAS] or [CLR] button again to stop the function. The function terminates automatically after 100 continuous measurements.

Figure E Description: Two diagrams illustrating continuous measurement. The top diagram shows a device measuring a minimum distance, with arrows indicating movement. The bottom diagram shows the device measuring a maximum distance.

5. Functions

Addition / Subtraction

For distance measuring:

• Pressing the [Plus (+)] button adds the next measurement to the previous one.
• Pressing the [Minus (-)] button subtracts the next measurement from the previous one.
• Pressing the [CLR] button cancels the last step.
• Pressing the [Storage] button returns to the single distance measurement.

Area Measurement

Press the [Area/Volume] button. The symbol appears in the display.

Press the [ON/MEAS] button to take the first length measurement (e.g., length).

Press the [ON/MEAS] button again to take the second length measurement (e.g., width).

The result of the area measurement is displayed in the third line, while the individually measured values are displayed in lines 1 and 2.

Volume Measurement

For volume measurements, push the [Area/Volume] button twice until the indicator for volume measurement appears in the display.

Afterwards:

• Press the [ON/MEAS] button to take the first distance measurement (e.g., length).
• Press the [ON/MEAS] button again to take the second distance measurement (e.g., width).
• Press the [ON/MEAS] button to take the third distance measurement (e.g., height). The value is displayed in the second line.

The result of the volume measurement is displayed in the summary line. The two previously measured values (length and width) are displayed in lines 1 and 2.

Indirect Measurement

Indirect measurement involves determining a distance using 2 or 3 auxiliary measurements. Refer to Figure G for indirect measurement (2 measurements).

Example: Measuring Heights (2 measurements):

Press the [Indirect measurement] button once. The display shows the symbol. The distance to be measured flashes in the symbol.

Aim at the upper point (1) and trigger the measurement using the [ON/MEAS] button.

After the first measurement, the value is adopted. Keep the instrument as horizontal as possible.

Press the [ON/MEAS] button again to measure the distance result of the horizontal point (2).

The result of the function is displayed in the summary line.

Figure G Description: A diagram illustrating indirect measurement using two auxiliary measurements to determine height. It shows the instrument, a target point (1), and a horizontal point (2).

Indirect Measurement - Determining a Distance Using 3 Measurements

Refer to Figure H for indirect measurement using 3 measurements.

Press the [Indirect measurement] button twice. The display shows the symbol. The distance to be measured flashes in the symbol.

Aim at the lower point (1) and trigger the measurement using the [ON/MEAS] button. After the first measurement, the value is adopted. Keep the instrument as horizontal as possible.

Press the [ON/MEAS] button to measure the distance result of the horizontal point (2).

Press the [ON/MEAS] button again to measure the distance result of the upper point (3).

The result of the function is displayed in the summary line.

Figure H Description: A diagram illustrating indirect measurement using three auxiliary measurements to determine height. It shows the instrument, a lower point (1), a horizontal point (2), and an upper point (3).

Figure I Description: A diagram similar to Figure H, potentially showing a different perspective or detail of the 3-measurement indirect method.

Historical Storage

The previous 20 records (measurements or calculated results) are shown in reverse order.

Use the [Plus (+)] or [Minus (-)] buttons to navigate through these records.

You can clear all records by pressing the [Storage] button and [CLR] button simultaneously while in historical storage mode.

6. Technical Data

Technical Specifications

* Use a target plate to increase the measurement range during daylight or if the target has poor reflection properties!

** In favourable conditions (good target surface properties, room temperature) up to 10 m (33 ft). In unfavourable conditions, such as intense sunshine, poorly reflecting target surface or high temperature variations, the deviation over distances above 10 m (33 ft) can increase by ± 0.15 mm/m (± 0.0018 in/ft).

Additional Specifications

7. Troubleshooting – Causes and Corrective Measures

8. Measuring Conditions

Measuring Range

The range is limited to 35m.

At night or dusk and if the target is in shadow, the measuring range without a target plate is increased. Use a target plate to increase the measurement range during daylight or if the target has poor reflection properties.

Target Surfaces

Measuring errors can occur when measuring toward colorless liquids (e.g. water) or dust-free glass, Styrofoam, or similar semi-permeable surfaces. Aiming at high gloss surfaces may deflect the laser beam and lead to measurement errors.

Against non-reflective and dark surfaces, the measuring time may increase.

Care

Do not immerse the instrument in water. Wipe off dirt with a damp, soft cloth. Do not use aggressive cleaning agents or solutions. Handle the instrument as you would a telescope or camera.

9. Labelling

The device is labelled with important safety information and product details.

Caution Label Details:

[!] CAUTION: LASER RADIATION

DO NOT STARE INTO BEAM

MAXIMUM OUTPUT < 1mW

WAVELENGTH 630-670nm

CLASS 2 LASER PRODUCT

Complies with EN 60825-1:1994/A11:1996/A2:2001/A1:2002

PLEASE READ MANUAL FOR SAFETY.

Type: LDM-100 by CEM

Power: 2 x "AAA" 1.5V batteries

Markings include CE.

For more information, visit: www.cem-meter.com.cn