Milwaukee LDM 50 Laser Distance Meter
User Manual and Technical Specifications
Introduction and Safety
This document provides instructions and technical specifications for the Milwaukee LDM 50 Laser Distance Meter. It is crucial to read and understand the safety instructions before operating the device.
Important Safety Instructions
Laser Classification: This is a Class 2 laser product in accordance with EN 60825-1:2007.
WARNING: Avoid direct eye exposure. The laser beam can cause flash blindness. Do not stare into the laser beam or direct it towards other people unnecessarily. Do not dazzle other individuals. Do not operate the tool around children or allow children to operate the tool.
The reflective surface could reflect the beam back at the operator or other persons. Keep extremities in a safe distance from moving parts. Carry out periodic test measurements, especially before, during, and after important measurements. Be aware of potential erroneous measurements if the product is defective, dropped, misused, or modified.
Use of controls, adjustments, or procedures other than those specified in the manual may result in hazardous radiation exposure. The laser distance measurer has usage limits; attempting to measure outside the specified range will cause inaccuracy. Adverse conditions (extreme temperatures, bright sunlight, rain, fog) can also result in inaccurate readings.
Allow the device to acclimatize to surrounding temperature before use when moving between significantly different environments. Store the device indoors, away from shock, vibration, dust, liquids, and high humidity. Clean only with a clean, soft cloth. Avoid heavy impact or dropping the tool; check accuracy if this occurs. Repairs should only be performed by authorized service personnel. Do not operate in explosion hazardous areas or aggressive environments. Use only manufacturer-recommended chargers. Dispose of batteries and the product according to local regulations.
Labeling
An adhesive label in your language is provided. Apply it in place of the English text on the specification plate before first use.
Product Overview
The Milwaukee LDM 50 is a versatile laser distance meter capable of various measurements including single distance, continuous measurement, minimum/maximum values, addition/subtraction, area, volume, and indirect measurements using Pythagoras calculations. It features a clear LCD display, multiple measurement reference points (front, back, corner pin), and memory functions.
Technical Data
| Specification | Value |
|---|---|
| Dust and Water resistance | IP54 |
| Receiving Lens | 14 mm |
| Focus | 35 mm |
| Maximum Measuring Range | 50 meters (Tolerance: 55m) |
| Minimum Measuring Range | 0.05 meters |
| Absolute Accuracy @ < 10m | ± 1.5 mm (Max) |
| Repeatability Accuracy @ < 10m | ± 1.5 mm (Max Typical, 2σ) |
| Repeatability Accuracy @ > 10m | Increase ± 0.25 mm / meter (Max Typical, 2σ) |
| Measurement Time | 0.5 s |
| Display Type | LCD (22.7 mm x 31 mm) |
| Power Type | AAA 2x (Alkaline Battery) |
| Battery Life | 10000 (Single Measure) |
| Laser Output Power | 0.6 mW ~ 0.95 mW (Class 2, 650nm) |
| Laser Spot Size | 25 x 30 mm @ 16 m (Max) |
| Laser Radiation Vertical Angle | +1 degree |
| Laser Radiation Horizontal Angle | ±1 degree |
| Device auto off time | 180 seconds |
| Laser auto off time | 30 seconds |
| Operating Temperature Range | -10°C to +50°C |
| Storage Temperature Range | -25°C to +70°C |
| Weight without Battery | 80 g |
Specified Conditions of Use
The laser distance measurer can be used for measuring distances and tilts. Do not use this product in any other way than stated for normal use.
Error Code Table
| Code | Description | Solution |
|---|---|---|
| Err01 | Out of measuring range | Measure in a proper range |
| Err02 | Reflect signal is too weak | Choose a better surface |
| Err03 | Out of display range (max value: 99.999) e.g. result of area or volume is out of display range | Check and verify values and steps are correct |
| Err04 | Pythagorean calculation error | Check and verify values and steps are correct |
| Err05 | Battery is low | Install new batteries |
| Err06 | Out of working temperature | Measure in an environment with the specified working temperature |
| Err07 | Ambient light is too strong | Measure in a darker place (shadow target) |
Key Operations and Functions
Changing Batteries
To change batteries, ensure the battery symbol on the display is flashing.
Steps:
- Open the battery compartment cover.
- Insert 2x AAA batteries, observing polarity.
- Close the battery compartment cover.
Corner Pin and Belt Clip
Corner Pin: The device can be used with the corner pin extended to measure from the edge of a surface. The laser beam is shown directed from the corner pin.
Belt Clip: The belt clip can be attached to the device for convenient carrying. It typically clicks into place.
Function Switch and Measuring Reference
The device offers various measurement modes and reference points:
- Modes: Area, Volume, Wall measurement, Distance measurement.
- Measuring Reference Points: Corner Pin, Front (standard), Back (automatic).
- Pythagoras Measurements: Supports three types of indirect measurements using Pythagoras theorem (Pythagoras 1, 2, 3), often used for height or distance calculations when direct measurement is not possible. These typically involve measuring two distances at specific angles (e.g., 90°) to calculate a third.
ON / MEASURE
To turn on: Press the [ON/MEASURE] button.
To measure: Press the [ON/MEASURE] button once for a single measurement.
Continuous Measurement: Press and hold the [ON/MEASURE] button for 2 seconds. This mode also allows for Min/Max function.
ADD / SUBTRACT MEASURING
This function allows adding or subtracting measured distances.
To add a value: Press the [+/- button] once, then perform a measurement.
To subtract a value: Press the [+/- button] twice, then perform a measurement.
Example: Measure 4.000 m, then subtract 3.000 m to get a result of 1.000 m.
AREA MEASURING
To measure area, select the Area function (e.g., by pressing the [M/ button] once). The device requires two measurements (length and width).
Example: Measure length (e.g., 2.000 m), then measure width (e.g., 2.000 m) to calculate an area of 4.000 m².
VOLUME MEASURING
To measure volume, select the Volume function (e.g., by pressing the [M/ button] twice). The device requires three measurements (length, width, and height).
Example: Measure length (2.000 m), width (3.000 m), and height (4.000 m) to calculate a volume of 24.000 m³.
INDIRECT MEASURING (PYTHAGORAS)
These functions calculate distances indirectly, often for height or length when direct measurement is not possible. They typically involve taking measurements at specific angles, usually 90 degrees.
Pythagoras 1: Used for calculating a single unknown side (e.g., height) given two other measurements.
Pythagoras 2: Used for calculating one unknown side using three measurements.
Pythagoras 3: Used for calculating one unknown side using three measurements, potentially for different geometric configurations.
Each method involves a sequence of measurements, often indicated by numbered points (1, 2, 3) in diagrams, and the device calculates the result based on the entered values and angles.
WALL AREA MEASURING (SCENARIOS 1 & 2)
These functions are designed to measure the area of walls, potentially with complex shapes or requiring multiple measurements. Scenario 1 and Scenario 2 likely differ in how the measurements are taken or how the wall's dimensions are captured, involving multiple points (1, 2, 3, 4, 5) to define the area.
TIMER
The timer function allows for delayed measurements, useful for positioning a part in the measuring beam. Press the [M/ button] to activate the timer. The timer can be set between 3 to 15 seconds. The device counts down the seconds before initiating the measurement.
MEMORY
Measured values are stored automatically. To retrieve stored values, press the [M/ button] for 2 seconds. The memory number and associated parameter will appear. Subsequent presses of the [M/ button] will cycle through stored values.
BASIC DESCRIPTION ON EXAMPLE OF AREA MEASURING (1 & 2)
These sections provide a step-by-step walkthrough of performing an area measurement.
Steps include:
- Turn On: Press the [ON/MEASURE] button. Acknowledge the laser warning.
- Choose Measuring Reference: Select the measurement reference point (Corner Pin, Front, Back) using the [+/- button].
- Choose Function: Select Area Measurement by pressing the [M/ button] once. The device is in single distance measurement mode by default.
- Measure Length: Level the device and press the [ON/MEASURE] button. The measured value appears briefly and is stored.
- Measure Width: Level the device and press the [ON/MEASURE] button again. The measured value appears briefly and is stored. The result (area) is displayed in the main line and stored.
- View Stored Values: Press the [M/ button] for 2 seconds to view stored measurements.
- Exit Memory: Press the [/c button] to exit memory mode.
- Switch Off: Press the [/c button] for 2 seconds to turn off the device. The device also switches off automatically after 3 minutes of inactivity.
