Velleman DEM900 User Manual

DEM900
V. 01 – 07/05/2015 6 ©Velleman nv
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
35 dB ~ 130 dB
accuracy
± 2.0 dB
resolution
0.1 dB
frequency response
31.5 Hz ~ 8 kHz
frequency weighting
dBA
light
measuring range
0 lux ~ 200 klux, 0 Fc ~ 20 kFc
accuracy
± 4 % rdg ± 0.5 % f.s.(< 10,000 lux)
air velocity
air velocity range
0.5 m/s ~ 30.0 m/s
air velocity accuracy
± 3 % ± 0.3 d
measurement units
m/s, km/h, ft/min, knots, mph
temperature
measurement range
-40° C ~ 70° C (-40° F ~158° F)
accuracy
±2.0° C ± 3.6° F
measurement units
°C/°F

Velleman DEM900 Specifications

General

Brand	Velleman
Model	DEM900
Category	Measuring Instruments
Language	English