Other Considerations; Display Error Codes - Extech Instruments DT500 User Manual

Other Considerations
Range considerations
The range is limited to 70m (230'). At night or dusk if the target is in shadow the measuring
range without target plate is increased. Use a target plate to increase the measurement range
during daylight or if the target has poor reflection properties. In unfavorable conditions such as
intense sunlight, poor reflective surfaces, or high temperatures distances over 10m (33ft.) can
increase by ±0.15mm/m (±0.0018in/ft.)
Target surfaces
Measurement errors can occur when measuring toward colorless liquids (e.g. water), dust free
glass, Styrofoam or similar semi‐permeable surfaces. Aiming at high gloss surfaces may deflect
the laser beam and lead to measurement errors. Against non‐reflective and dark surfaces the
measuring time may increase.
Care
Do not immerse the instrument in water. Wipe off dirt with a damp, soft cloth. Do not use
aggressive cleaning agents, solvents, abrasives, or such solutions. Handle the instrument as you
would a telescope or camera.
Display Error Codes
For any error codes, cycle power to the instrument to see if the error clears. If the error persists
after several power cycles, following the directives below. Note that a 'wrench' icon appears
with error code displays.
204 – Calculation Error (retry the procedure)
208 – Received signal too weak. Measurement time is too long. Distance >50m (Use target plate)
209 – Received signal too strong (Target too reflective, use a target plate)
252 – High Temperature (Cool down the instrument)
253 – Low Temperature (Warm up the instrument)
255 – Hardware error (Return the instrument for service)
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