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Metrologic Instruments IS4813, IS4815, IS4823, IS4825 Bar Code Element Time Calculation

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Bar Code Element Time Calculation

Realization of the full depth of field for all bar codes given in the specification is based on the ability of the

decoding hardware to resolve a varying range of minimum element times. The minimum element time

calculation for a given bar code size at a given distance is shown in Equation 1 (below).

Minimum Element Time = (Element Size / Spot Speed)

Equation 1.

Example:

Bar code Size = 5.2 mil

Spot Speed @ 95 mm from face = 650 inches/second

Minimum Element Time = (0.0052 inches/ (650 inches/second)) = 8.0 µsec

Contents

Main Disclaimer Trademarks Patents Table of Contents Introduction Assembly Mounting Specifications Page Introduction Product Overview Models and Accessories Non-Decode Engines Options Accessories Decode Engines Components of the IS4800 Engine Series IS4813 and IS4815 Non-Decode Engine IS4823 and IS4825 (-0) Decode Engine Assembly IS4823 and IS4825 Bracketed (-1 and -2) Decode Engine Assembly Assembly IS4823-2 and IS4825-2 Item Description Qty. Mounting Specifications IS4813 and IS4815 Scan Engine Dimensions IS4823 and IS4825 Bracketed (-1 and -2) Dimensions IS4823 and IS4825 (-0) Decode Printed Circuit Board Dimensions Exit Beam Specifications Enclosure Specifications Electrostatic Discharge (ESD) Cautions Grounding Power Supply Power Sequencing Flex Cables Thermal Considerations Printed Circuit Board (PCB) Component Clearance Magnetic Sensitivity Airborne Contaminants and Foreign Materials Beam Clearance Output Window Properties Output Window Coatings Output Window Angle Page Page Scan Engine Field of View and Depth of Field Field of View Distance from Engine Face Width of Field of View Depth of Field vs. Minimum Bar Code Element Depth of Field* (In the Field of View) Descriptions of IS4823 and IS4825 Operating Modes Activation Modes Common Activation Mode Features Continuous Blinky Mode Sleep Mode Serial Configuration Mode Example 1: [ack] [nak] Enter Serial Configuration Mode Abbreviated ASCII Table Character Hex Value Decimal Value General Design Specifications Operational Mechanical Electrical IS4823 IS4825 Environmental Detailed Electrical Specifications Absolute Maximum Ratings Signal Signal Description Minimum Maximum IS4823 DC Operating Voltages Signal Signal Description Minimum Maximum Condition IS4825 DC Operating Voltages Signal Signal Description Minimum Maximum Condition Current Draw @ 25C USB TTL Signal Signal Description VIN = 3.3V VIN = 5V VIN = 3.3V VIN = 5V Scan Engine Terminations IS4813 Engine Connections IS4815 Engine Connections Decode Printed Circuit Board Terminations USB Decode PCB, 3.3V USB Decode PCB, 5V TTL, RS232, 3.3V / 5V Flex Cable Specifications and Installation Guidelines Timing Diagrams Startup Condition Timing Diagram Scan Sense Timing Diagram Bar Code Element Time Calculation Regulatory Compliance United States Canada Laser Safety EMC Europe Laser Safety Caution Atencin Attention Achtung Attenzione Limited Warranty Page Index Page Contact Information Product Service and Repair