Extech Instruments RH520 User Manual

RH520 V2.9 3/07 10
Display Modes
STANDARD VIEW
The Standard View is the display state of the RH520 when it is turned on. Refer to the
diagram in the display description section of this manual for a representation of the
Standard View. To reach the Standard View at any time, press the VIEW button. Note that
the display automatically reverts to the Standard View five (5) minutes after the last button
press.
CURSOR
The CURSOR location is indicated by a small diamond located between the two graphs.
See diagram. There is one diamond for each horizontal pixel in the graph (64 positions).
The date, time, and measurements for the data point selected by the cursor are shown in
the Time/Date and numerical measurement display fields.
 Each press of the RIGHT ARROW button will move the cursor to the right. When the
cursor reaches the right side limit, the graph will move to the left. Holding the button
down will speed the scrolling rate. When the cursor reaches the oldest (last) reading, it
will stop.
 Each press of the LEFT ARROW button will move the cursor to the left. When the
cursor reaches the left side limit, the graph will move to the right. Holding the button
down will speed the scrolling rate. When the cursor reaches the newest (latest)
reading, it will stop.
 Each press of the UP ARROW button will shift the graph to the next set of 64 values; to
the left of the ones currently displayed (the cursor will not move).
 Each press of the DOWN ARROW button will shift the graph to the next set of 64
values; to the right of the one displayed (the cursor will not move).
Cursor
Position
Time and Date of readings
at current cursor position
Measurements
at current
cursor position

Extech Instruments RH520 Specifications

General

Resolution	0.1% RH
Temperature Range	14°F to 140°F (-10°C to 60°C)
Power Supply	Four (4) AAA batteries
Sampling Rate	1 second to 24 hours
PC Interface	USB
Wet Bulb Range	14°F to 140°F (-10°C to 60°C)
Operating Temperature	14°F to 140°F (-10 to 60°C)

Summary

Introduction

Warranty

Specifications

RH520 Description

Display Description

Push-Button Description

Getting Started

Power

Details about power sources, battery backup, and indicators.

Mounting the RH520

Describes table top and wall mounting options for the device.

Measurement Probe

Information on the probe's cable and usage.

Push-Button Lock-Out Security Feature

Instructions for locking and unlocking the device's push-buttons.

Programming the RH520

Setting the Time and Date

Procedure for setting the device's time and date parameters.

Clearing the Internal Memory

Instructions for clearing recorded data and alarm history.

Selecting the Unit of Measure for Temperature (°C/°F)

How to switch between Celsius and Fahrenheit temperature units.

Setting the Vertical Resolution for the Temperature Graphic Display

Configuring the temperature graph's vertical scale limits.

Setting the Vertical Resolution for the RH Graphic Display

Configuring the RH graph's vertical scale limits.

Setting the Recording Sample Rate

Setting the Temperature Alarm Limits

Setting the RH Alarm Limits

Display Modes

Standard View

The default display state when the RH520 is turned on.

Cursor

Describes cursor location and movement for data point selection.

MAX-MIN Displays

Alarm Displays

Using the Clock to Sort Through Stored Readings

Dew Point Display

Sample Rate Display

Alarm Conditions and the Alarm History

Factory Default Settings

Lists the default configurations for LCD mode, resolution, and limits.

Battery Replacement

Step-by-step guide for replacing the device's batteries.

Optional Alarm Relay Module

Information on connecting and using the optional alarm relay module.

Calibration and Repair Services