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8 Measuring
8-1 Before
Measuring
Before measuring dust levels, measure the background (BG) signal level and adjust sensitivity.
8-1-1 Background (BG) Measurement
Background (BG) refers to the false reading (also called "dark count") output when the
detector is filled with clean air. Background levels result in excessive dust measurement
values. Therefore, this product includes a function that measures the background level
immediately before measuring dust and then subtracts that value from dust measurements.
Background Measurement Procedure
(1) Confirm that the mark on the scattering plate
knob is at the [MEASURE] position.
(2) Open the valve and turn the power switch ON.
→
The startup screen appears and then the
operation screen (standby mode) is
displayed.
Startup Screen
Operation Screen (Standby mode)
Indicator
mark