DVM401 Rev. 02
09.01.2014 ©Velleman nv
5
2.
Features
• the device measures sound levels, luminous intensity, temperature
and humidity
• the 3 1/2–digit LCD displays the following units: Lux, °C, %RH, C &
dB and A & dB
• low-battery indication
• luminous intensity from 0.01 to 20000Lux
• sound level range (resolution 0.1dB)
A-weighting LO (low) : 35 – 100dB
A-weighting HI (high) : 65 – 130dB
C-weighting LO (low) : 35 – 100dB
C-weighting HI (high) : 65 – 130dB
• humidity measurements from 25 to 95%RH, fast response and
resolution 0.1%RH
• temperature measuring levels from –20°C to +750°C / -4°F to
+1400°F
3. Overview
Refer to the illustration on page 2 of this manual.
1. LCD display: 3 ½-digit LCD. Displays a wide variety of units (Lux, x
10 Lux, °C, °F, %RH, dB, A, C, Lo, Hi) and also gives ‘BAT’, ‘MAX
HOLD’ and ‘DATA HOLD’ indications.
2. Power button: activates or deactivates the device
3. Select button: Used to select function and range
4. MAX HOLD: Press this button to hold the maximum reading. Press
again to release the reading and continue your measurements.
5. DATA HOLD: Press the HOLD button to hold a particular reading
and press it again to continue your measurements.
6. Function switch: Select temperature, humidity, sound level and
luminous intensity with this switch.
7. Microphone: built-in electret condenser microphone
8. Photo detector: long-life silicon photo diode is built in
9. Sensor for humidity measurements is built-in
10. Temperature terminal: insert the temperature probe in this
terminal
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