42280-EU-EN-V4.4-12/11
4
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.
