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Extech Instruments RH390

Extech Instruments RH390
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User's Guide
Digital Psychrometer
Model RH390
Introduction
Congratulations on your purchase of the Extech RH390 Digital Psychrometer.
This device measures Humidity, Air Temperature, Dew Point temperature and
Wet Bulb temperature. Advanced features include Data Hold, Auto Power Off,
and MAX/MIN reading. Careful use of this meter will provide years of reliable
service.
MAX
MIN
°F•°C•WBT
Dew Point
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Extech Instruments RH390 Specifications

General IconGeneral
Resolution (Humidity)0.1% RH
Data LoggingYes
Datalogging Capacity16, 000 data points
InterfaceUSB
Resolution (Temperature)0.1°F/°C
Accuracy (Humidity)±3% RH
Temperature Range-4 to 140°F (-20 to 60°C)
Temperature Accuracy+/-1.8°F/1°C
Dew Point Range-68 to 140°F (-20 to 60°C)
Wet Bulb Range-4°F to 140°F (-20 to 60°C)
DisplayBacklit LCD
Storage Conditions-4°F to 140°F (-20°C to 60°C), <90% RH

Summary

Introduction

Specifications

Humidity Specifications

Details on humidity measurement range, resolution, and accuracy.

Temperature Specifications

Details on temperature measurement range, resolution, and accuracy.

Display and Measurement Specs

LCD type, response time, sensor type, Wet/Dew Point ranges.

Operating and Storage Conditions

Environmental limits for meter operation and storage.

Power and Battery Life

Power supply type and approximate battery life.

Warranty Information

Meter Controls and Features

Sensor and Button Identification

Identifies the Humidity/Temp Sensor and device buttons.

LCD Display Explained

Display Icons and Readings

Explains the meaning of icons and readings shown on the LCD.

Device Operation and Functions

Powering On and Off

Instructions on how to turn the device on and off.

Taking Measurements

Steps for performing general measurements and toggling display modes.

Dew Point and Wet Bulb Readings

How to select and display Dew Point and Wet Bulb temperature readings.

Data Hold Function

How to freeze and release current readings on the display.

MinMax and Backlight

Viewing min/max readings and controlling the LCD backlight.

Automatic Power Off Feature

Explanation of the auto power off feature and how to disable it.

Maintenance and Service

Cleaning and Storage Guidelines

Guidelines for cleaning and storing the instrument.

Battery Replacement Procedure

Steps for replacing the device's battery.

Calibration and Repair Services

Information on calibration, repair services, and contact details.

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