5
Battery and Charger
The LD-2M has a built in Lithium Ion rechargeable battery, and is supplied
with an intelligent charger unit. In normal use the battery will last around
100 hours. When the battery indicator reads low, or when the battery is
completely flat, plug in the charger unit and allow to charge for 12 hours.
The charger unit is a universal type which can operate from 110-240v a.c.
At 50/60 Hz. An adaptor may be required depending on the country of
use.
Testing the Accuracy
Please use the following simple procedure to check the accuracy of the LD-
2M before using. This should also be carried out if the unit is dropped, or
is being used in an environment that varies more than 5°C from the envi-
ronment in which it was last calibrated.
1) Place the LD-2M down on
a clean, flat horizontal sur-
face. The surface does not
have to be exactly level.
Wait 10 seconds so the dis-
play is completely stabilised
and note the X and Y angle
readings from the display.
2) Turn the instrument
through 180° (see drawing),
and place back down in the
same spot on the surface.
Wait 10 seconds so the dis-
play is completely stabilised
and note second set of read-
ings of the X and Y angle.
3) Compare the two X-axis readings. One reading should be the negative
of the other. For example if X
1
= +0.35° then X
2
should read -0.35°. If
there is more than 0.05° variation then unit will need to be recalibrated
(see page 7). Check the same for the Y-axis readings.
