OPERATING & MAINTENANCE TIPS
Because the laser silently auto powers off after 30 seconds of inactivity while the
LDM remains powered on, you’ll often find that when you press the button
expecting to make a measurement, all you have done is reactivate the laser. In this
case, you have to press the button a second time to take a reading.
When measuring horizontal distances, keep the LDM as horizontal as possible,
using the digital angle reading on the top line of the display as a guide.
When measuring long distances, use a target plate made of white paper or
cardboard. Using a monopod or resting the LDM on a surface (rather than holding it
in your hand) helps to steady the laser on distant targets.
The LDM will almost always register an “Error 204” if the target is an LCD or
plasma computer or TV screen. The calculation error results because the display
absorbs the incoming beam and reflects nothing back to the LDM.
The following errors can be corrected:
Code Cause Corrective Measure
Error 204 Calculation error Repeat the measurement(s)
Error 252 Temperature too high Cool down the LDM
Error 220 Low battery Install fresh batteries
Error 253 Temperature too low Warm up the LDM
Error 255 Received signal too weak/ Use white target plate
Measurement time too long
Error 256 Received signal too strong Use target plate
(target too reflective)
Error 500 Hardware/uncertainty error Power the LDM off and on
Replace the batteries (see page 8) when the on-screen battery icon
indicates that their charge has been depleted.
Use Alkaline batteries only.
To avoid having old batteries leak and ruin the LDM, remove the batteries when you
do not expect to use the instrument for a long period of time (several months).
Clean the LDM with wiping it with a damp soft cloth. Never use solvents or
abrasives.
Keep the LDM away from water, toxic environments and temperature extremes.
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