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3.8 PM (Sig)
The PM (Sig) tab shows the absolute (or modulus) voltage signal from the particulate sensors after
correction for the sensor voltage during zeroing. Typically, the user would not need to pay attention to
this tab, but it does provide a window into the response of the scattering, ionization and opacity sensor
channels. It is mostly for troubleshooting issues with particulate sensor response and calibration.
However, in some situations, such as when measured engine technology or fuel is significantly different
from typical and the conversion to concentration or number units are not likely to be very robust, the
unprocessed signal could provide some insight to the nature of the measured particles.
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