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