DVM77N
VELLEMAN
4
5. Technical Specifications
Measurement Range
-20°C ~ 270°C (-4°F ~ 518°F)
Accuracy
+/- (2% of rdg + 3°C/6°F)
Ambient Temperature Measurement Range
0°C ~ 50°C (32°F ~ 122°F)
Resolution 1°C/1°F
Emissivity 0.95
Distance-to-Spot Ratio
6:1
Overrange Indication
“OL” or “-OL”
Auto Power-Off
20s
Power Supply
2 x AAA battery (order code LR03C, incl.)
Dimensions
94 x 59 x 28mm
Weight 75g
6. Measurement Principle
Non-contact thermometers detect the infrared ray of an object, focus the infrared energy of the object onto a sensor through a lens, and
transfer the surface temperature into an electric signal. A microcomputer calculates and displays the measurement temperature on the LCD.
The laser is only used to aim the thermometer.
7. Operation
•
How to Measure an Object’s Temperature
Point the infrared sensor towards the object and press the SCAN button. The thermometer emits a laser beam. Read the measured
temperature value from the LCD display. Release the SCAN button. The thermometer will automatically power off after 20 seconds. Refer to
“8. D:S Ratio” for accurate results.