Technical Specifications; Measurement Principle - Velleman DVM77N Manual Del Usuario

5. Technical Specifications

Measurement Range
Accuracy
Ambient Temperature Measurement Range
Resolution
Emissivity
Distance-to-Spot Ratio
Overrange Indication
Auto Power-Off
Power Supply
Dimensions
Weight

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.
DVM77N
-20°C ~ 270°C (-4°F ~ 518°F)
+/- (2% of rdg + 3°C/6°F)
0°C ~ 50°C (32°F ~ 122°F)
1°C/1°F
0.95
6:1
"OL" or "-OL"
20s
2 x AAA battery (order code LR03C, incl.)
94 x 59 x 28mm
75g
4 VELLEMAN