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(3) Background (BG) Measurement
1) Turn the scattering plate knob to the [MEASURE]
position.
2) Lift up the cap to close the PM2.5 cyclone cap (see
figure on right).
3) Leave the instrument in this state for at least one minute.
(Switch the LD-5 power ON.)
4) Press the TIMER SET▼ switch to set the
measurement time/mode display to [BG]. ("BG" is
displayed in the lower left of the screen. )
5) Press the START/STOP switch.
6) After waiting, the dust is measured for about six
seconds.
This BG measurement value will be cancelled starting
with the next concentration measurement.
z The BG value cannot be set properly if it is measured with the cap opened.
Doing so could affect measurement results, such as causing the instrument
to continue displaying a measurement value of zero. If the BG value has
been measured with the cap opened, close the PM2.5 cyclone cap and
measure the value again.
z Pressing the START/STOP switch during the six-second BG measurement
cancels the measurement and stops the BG value from being subtracted
from the next dust measurement (resulting in a measurement value
increased by the amount of the BG value).
PM2.5 cyclone cap
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