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2.3.4 Using the Distance Function
• There should be a clean, open line of sight from the distance
device to the target, otherwise an erroneous reading will result.
• For accurate distance measurement readings, the surface
must be hard, flat, and reflective to ultrasonic pulse.
• Distance measurement can not be taken through glass, or
off of soft and padded surfaces, or through smoke or fog.
• The distance measurement unit must be held perpendicular
to the target surface.
• The distance measurement unit is designed for indoor use only.
• Accuracy of the distance measurement unit will vary
depending on environmental conditions.
• Do not aim the distance measurement unit at a person.
The thermometer provides distance measurement as an option. This function
is either built-in or field mountable. The field mountable version (HH-DM)
mounts on top of the thermometer and is a stand-alone device. It operates
independently of the thermometer. Model HH-DM operates from a 9Vdc
battery. Press the key to measure distance. Press and hold the key
for about 2 seconds to convert distance from Feet to Meters or vise versa. Press
the same key to turn off the device or it will turn itself off in about 7
minutes.
Figure 2-14. Figure 2-15. Infrared Thermometer With
Model HH-DM Distance Meter Built-in Distance Measurement (-DM)
C
OFF
C
OFF
Using the Handheld Infrared Thermometer
2
2-12
CAUTION
LCK
Distance
Power Switch