DEM900
V. 01 – 07/05/2015 5 ©Velleman nv
7. Operation
7.1 Basic Operation
1. Press the power button to switch on the meter.
2. Press the backlight button to switch the backlight on or off.
3. Briefly press the data-hold button to freeze the reading on the display.
Press again to unfreeze.
4. Press the MIN/MAX button to display the recorded maximum value,
press again to display the recorded minimum value, press again to exit
the function.
5. Hold the power button pressed for 3 seconds to switch off the meter.
7.2 Measuring the Sound Level
1. Press the function selection button until the sound level unit appears
on the LCD display.
2. Aim the microphone to the sound source at a distance of 1 to 1.5 m.
The sound level appears on the display.
7.3 Measuring the Light Level
1. Connect the light probe to the meter.
2. Press the function selection button until the light level unit appears on
the LCD display.
3. Press the unit selection button to select the light unit.
4. The light level appears on the display.
7.4 Measuring the Air Velocity
1. Connect the wind probe to the meter.
2. Press the function selection button until the air velocity unit appears on
the LCD display.
3. Press the unit selection button to select the air velocity unit.
4. The air velocity appears on the display.
7.5 Measuring the Temperature
1. Connect the temperature/humidity probe to the meter.
2. Press the temp/humidity selection button until the temperature unit
appears on the LCD display.
3. Press the °C/°F selection button to select the temperature unit.
4. The value appears on the LCD display.
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