Specifications Distance Meter No. 27-D08M-0726.pdf

Spec. No. 27-D08M-0726

Requirements and Specifications

Distance Measuring Instrument

Overview The Distance Measuring Instrument (DMI) is a vehicle-mounted system designed to measure distance, speed, and location with high accuracy. It supports both sensor-based and GPS-based distance measurement and provides extensive storage, data logging, and connectivity options. The instrument is optimized for roadway inventory, surveying, engineering applications, and any task requiring precise measurement of traversed or aerial distances.

Key Capabilities

• Measures precise distance in feet, miles, meters, and other selectable units

• Measures speed in mph, kph, fps, and fpm

• Supports user-selectable signal sources, including vehicle speed sensor or integrated GPS

• Logs multiple fields such as user-defined event numbers, speed, distance, GPS coordinates, and timestamps

• Stores and retrieves events through onboard menus or a USB-based data interface

• Provides both traversed and aerial distance measurement

• Allows recording of roadway features with associated GPS coordinates

• Supports continuous GPS data collection at one-second intervals for extended durations

Core Features

• Large 8-digit LED display for distance and menu information

• Dual-window display for simultaneous viewing of distance, speed, event codes, interval distance, and GPS data

• High measurement accuracy: up to 0.5 ft per mile depending on calibration

• Four-digit calibration capability for improved precision and support for multiple stored calibration sets

• Automatic calibration and automatic unit conversions

• Bidirectional counting with automatic direction handling

• Compact housing approximately 6.5 x 2.9 x 1.1 inches

• Sensor-less operating option using integrated GPS

• Firmware upgrade capability via USB

• Non-volatile memory storage for long-term data retention

• Storage capacity for up to 40,000 to 400,000 events, depending on configuration

• Programmable pulse output for external devices

• Remote display freeze function

• Adjustable display brightness for varying ambient conditions

• Event/code identification using four-digit numeric identifiers (0–9999) for asset inventory

• Ability to store multiple vehicle calibration profiles for shared-instrument use

Spec. No. 27-D08M-0726

GPS Functionality

• Integrated high-sensitivity GPS receiver supporting fast updates (up to 10 Hz)

• WAAS-enabled augmentation for improved horizontal accuracy (approximately 2 meters with augmentation, typical 6 meters without)

• Capability to measure distance using GPS in place of external vehicle sensors

• Ability to log GPS coordinates for roadway features, intersections, signs, structures, and other surveyed points

• Ability to display latitude and longitude directly, including segmented display of coordinate digits for efficient field use

• Support for storing GPS data continuously for extended durations (up to 30 hours)

Data Logging and Retrieval

• Logs distance, interval distance, speed, time, event codes, and GPS coordinates

• Event data stored in long-term NVRAM with multi-decade retention

• USB interface compatible with legacy serial-based applications

• Supports data download to computers for analysis, reporting, and export to mapping or spreadsheet software

• Menu-driven controls for selecting operational modes and configuration options

Connectivity and Expansion

• Provides signals compatible with peripheral equipment such as printers, computers, marking systems, and remote control interfaces

• USB interface used for communication, configuration, and firmware updates

• Expandable architecture supporting optional customizations to meet specialized operational requirements

Reliability and Construction

• Solid-state electronic design resistant to electrical noise and interference

• High-performance microprocessor for rapid data processing and real-time measurement

• Non-volatile memory ensuring preservation of logged data

• Optional external sensors available for applications requiring maximum measurement accuracy

• Suitable for installation in typical automotive environments

Warranty and Documentation

• Limited multi-year warranty on primary unit components

• Detailed operator’s manual with examples and instructions for field operation

• Accessory warranties vary by component type