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Extech Instruments HD450 User Manual

Extech Instruments HD450
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User's Guide
H
eavy Duty Datalogging Light Meter
with PC Interface
Model HD450

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Extech Instruments HD450 Specifications

General IconGeneral
Humidity Range0 to 100 %RH
Resolution0.1°F/°C; 0.1%RH; 1ft/min, 0.1m/s, 0.1km/h, 0.1MPH, 0.1 knots
AccuracyAir Velocity: ±3% of reading; Air Temperature: ±1.4°F/0.8°C; Humidity: ±3%RH
Power Supply9V battery
Humidity Accuracy±3 %RH
Data HoldYes
Min/MaxYes
Auto Power OffYes
Sampling Rate1 second
Temperature Range-20 to 60 °C
DisplayLCD
Air Velocity Range0.4 to 30 m/s
Air Velocity Accuracy±3 %
Air Temperature Range-20 to 60 °C
Operating Temperature0 to 50 °C
Storage Temperature-20 to 60 °C

Summary

Meter Description

External Components

Identifies sensor plug, USB jack, buttons, and light sensor.

Display Overview

Describes the main LCD display and its segments.

LCD Display Indicators and Symbols

Status and Mode Indicators

Explains icons for clock, APO, battery, hold, and memory status.

Measurement and Data Indicators

Details range indicators, units, PC connection, memory numbers, and bargraph.

Operation

Meter Power and Auto Power Off

Details how to turn the meter on/off and manage automatic power off.

Unit of Measure and Range Selection

Explains changing units (Lux/Fc) and selecting measurement ranges.

Taking a Measurement

Guides on sensor placement, reading display, and handling over-range conditions.

Data Hold Function

How to freeze the current LCD display value.

Peak Hold Functionality

Capturing short-duration light flashes and identifying peak values.

Maximum and Minimum Readings

Storing and viewing highest (MAX) and lowest (MIN) readings.

Relative Mode Operation

Setting a reference value and displaying readings relative to it.

LCD Backlight Usage

Activating, deactivating, and conserving battery with the backlight.

Clock and Sample Rate Setup

Configuring time, date, and data sampling intervals.

99 Point Manual Memory

Storing up to 99 readings manually and viewing them.

16,000 Point Datalogger

Automatic data recording and clearing the datalogger memory.

USB PC Interface

Connection and Software Overview

Connecting meter to PC via USB and using supplied software for data management.

Specifications

Range Specifications

Detailed ranges, resolutions, and accuracies for Lux and Foot candles.

General Specifications

Lists display, response, operating conditions, dimensions, and battery life.

Maintenance

Cleaning and Battery Replacement

Instructions for cleaning the meter and replacing its battery.

Storage and Disposal

Guidelines for storing the meter and disposing of the device and batteries.

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