Velleman DVM77N Manuel d'utilisateur télécharger pdf (Page 4)

DVM77N VELLEMAN

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.

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Velleman DVM77N Manuel d'utilisateur Page 4