Velleman DVM401 - Front Panel Description

DVM401 VELLEMAN 2
C-weighting HI (high) : 65 – 130dB
resolution 0.1dB
Typical Frequency Range 30Hz to 10KHz
Frequency Weighting A- & C-weighting
Time Weighting fast
Maximum Hold max. value does not change if the increase in volume < 1.5dB / 3 min.
Accuracy ±3.5dB at 94dB, 1KHz sine wave
Microphone electret condenser microphone
LIGHT
Measuring Range 20, 200, 2000, 20000Lux (20000Lux reading x 10)
Overrange Indication “1”
Accuracy ±5% of reading + 10 digits (calibrated with standard incandescence lamp
at a colour temperature of 2856K)
Thermal sensitivity ±0.1°C
Photo detector silicon photo diode with filter
HUMIDITY / TEMPERATURE
Humidity Measurement Range 25 to 95%RH
Temperature Range -20°C to +50°C (-4°F to +122°F) with built-in temperature
sensor
-20 to +200°C (-4°F to +200°F) for low range
-20 to +750°C (-4°F to +1400°F) for high range
Resolution 0.1%RH, 0.1°C/0.1°F low range, 1°C/1°F high range
Accuracy (after calibration)
Humidity ±5%RH (at 25°C, 35 to 95%RH)
Humidity Sensor Response Time ±6 min.
Temperature ±3% rdg ±2°C (from –20°C to +200°C)
±3.5% rdg ±2°C (from –20°C to +750°C)
±3% rdg ±2°F (from –4°F to +200°F)
±3.5% rdg ± 2°F (from –4°F to +1400°F)
Input Protection 60V DC or 24V AC rms
4 Front Panel Description
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.