Front Panel Description - Velleman DVM501 Mode D'emploi

4. Front Panel Description

1. LCD display: 3 ½-digit LCD. Displays a wide variety of units: Lux, x 10 Lux,
°C, %, dB and low battery 'BAT' indication.
2. Selection switch: to turn the power on or off and select the measurement
function and range.
3. Photo detector: built-in long-life silicon photo diode.
4. Built-in humidity sensor + semiconductor sensor (for temperature
measurement)
5. Microphone: built-in electric condenser microphone.
6. Socket for transistor hFE test.
7. V / Ω / mA / °C input jack.
8. COM input jack.
9. 10A input jack.
5. Operating Instructions
a) Measuring Sound Levels
1. Set the selection switch (#2) to the dB position.
2. Hold the microphone at a horizontal angle to the source to be measured.
3. The C-weighting curve has a frequency range of 30-10.000Hz, thus giving an indication of the overall sound level.
4. The fast response is ideal to measure short bursts of sound and peak values.
5. The sound level is displayed.
Note: strong wind (> 10m/sec.) blowing on the microphone can cause false measurements. Use a windscreen when
working in windy locations.
b) Measuring Light Levels
1. Set the selection switch (#2) to the desired LUX-position (Lux or x10Lux).
2. Hold the detector at a horizontal angle to the source to be measured.
3. Read the nominal value from the display.
4. The overrange indication ("1") is displayed if the input signal exceeds the range limit. Select a higher range.
5. Remove the photo detector from the light source when the measurement is completed.
6. The spectral sensitivity of this device is very similar to the CIE curve (International Commission on Illumination):
relative sensitivity
relatieve gevoeligheid
sensibilité relative
sensibilidad relativa
relative Empfindlichkeit
DVM501
spectral sensitivity
spectrale gevoeligheid
sensibilité spectrale
sensibilidad espectral
spektrale Empfindlichkeit
Wavelength (Nm)
Golflengte (Nm)
Longueur d'onde (Nm)
Longitud de la onda
Wellenlänge
3 VELLEMAN