User Manual

42280 V3.0 10/2007

Operation

Important Note before starting

This meter relies on firm button presses to operate correctly. Be sure to press firmly and

hold the button for as long as directed in the instructions.

Meter Power

1. The meter is powered by four (4) ‘AA’ 1.5V batteries or the 117V AC adaptor.

2. When the batteries are installed or the adaptor is connected to an AC power source,

momentarily press the START-STOP button to turn the meter ON.

3. Press the START-STOP button again to turn the meter OFF.

Viewing the displayed readings

1. Normally, the top line indicates temperature in degrees C or F. Use the MODE button

to switch between degrees C and degrees F.

2. Press and hold the MODE for at least 2 seconds. This will change the top display to

Dew Point temperature. The ‘DP’ icon will appear on the LCD when in Dew Point

mode. Press and hold the MODE button for at least 2 seconds to return the top display

to the normal temperature display mode.

3. The middle line displays Relative Humidity in %.

4. The bottom line automatically alternates between Time and Date displays.

5. If the ALM status LED illuminates and the display flashes, one of the Alarm limits has

been reached. Program the High and Low Temperature/Humidity limits in

Programming parameter P5 (detailed later in this user guide).

Datalogger Basics

The Model 42280 has a built-in Datalogger that can store up to 8000 temperature and

8000 humidity readings. Readings can be stored in the meter and transferred at a later

time to a PC. The meter can also display real-time readings on a connected PC; in other

words, the PC can display readings at the instant the readings are taken.

The meter must be configured

before datalogging can be attempted. Parameters such as

Real Time Clock and Datalogger Sample Rate must be programmed before datalogging

can begin. It is strongly recommended

that the user take advantage of the supplied

software to configure the meter. Instructions for manually configuring the meter are

provided below; however configuring the meter via software is very convenient.

Basic instructions for connecting the meter to a PC and getting started with the supplied

software are provided later in this guide. Detailed instructions regarding the supplied

software are provided in a separate manual included on the supplied CD-ROM and the

HELP utility in the software program.