DT100 Datasheet, PDF (4/8 Pages) Extech Instruments Corporation. – Ultrasonic Distance Finder

Operating Instructions
Notes and Measurement Considerations
1. For best results, choose a target that is flat, hard and smooth
2. Use a piece of cardboard or similar material if the target size needs to be increased
3. Replace the battery if the battery icon appears in the display
4. The meter will not measure through glass
5. Always measure perpendicular to the target. Do not point at an angle
6. Surfaces parallel to the measurement beam should be at least 4” (10cm) from the side,
top or bottom of the meter.
4” 10cm
7. When measuring between 40’ and 50’ (12m and 15m) the relative humidity should be
above 50% and the target area at least 10ft x 10ft (3m x 3m)
8. Inaccurate measurements may result from any of the following:
a) Low battery
b) Measured distance exceeds specified range: 1’5” to 50’ (0.5 to 15m)
c) Interference from other ultrasonic sources
d) Meter is not held perpendicular to the target
e) Long narrow corridors
f) Irregulat objects near the target
9. An error message “Err” will appear in the display when:
a) The measured distance or calculation exceeds the specified range
b) The instrument is held at a wide angle to the target
c) The target surface is not reflective ( i.e. soft and irregular surface
such as carpet, curtains or irregular wall paper)
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Model DT100 V4.2 9/08