Cleaning And Maintenance; Technical Specifications - Velleman DEM900 Manual Del Usuario

7.6 Measuring the Humidity Level
1. Connect the temperature/humidity probe to the meter.
2. Press the temp/humidity selection button until the humidity level unit
appears on the LCD display.
3.
The value appears on the LCD display.
7.7 Calibration
1. Select the A-weighing frequency.
2. Carefully insert the microphone into the calibrator (not included).
3. Calibrate the microphone to 94 dB through the CALL potentiometer. To
do so, use the included calibration tool.
Remarks:
It is advised to calibrate the meter once a year.
•
Velleman nv does not provide any calibration certificate.
•

8. Cleaning and Maintenance

Wipe the device regularly with a moist, lint-free cloth. Do not use
•
alcohol or solvents. DO NOT submerge the device in any liquid.
Store the meter in a dry place away from humidity and vibrations.
•
Remove the battery when the meter is to be stored for long periods of
•
time.

9. Technical Specifications

sound level
measurement range
accuracy
resolution
frequency response
frequency weighting
light
measuring range
accuracy
air velocity
air velocity range
air velocity accuracy
measurement units
temperature
measurement range
accuracy
measurement units
V. 02 – 29/01/2016
DEM900
35 dB ~ 130 dB
± 2.0 dB
0.1 dB
31.5 Hz ~ 8 kHz
dBA
0 lux ~ 200 klux, 0 Fc ~ 20 kFc
± 4 % rdg ± 0.5 % f.s.(< 10,000 lux)
0.5 m/s ~ 30.0 m/s
± 3 % ± 0.3 d
m/s, km/h, ft/min, knots, mph
-40° C ~ 70° C (-40° F ~158° F)
±2.0° C ± 3.6° F
°C/°F
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