Instrument Description 3-5
Particle concentrations calculated based on the particle counts
from the counting electronics hardware are not corrected for particle
coincidence. Thus, the concentration obtained this way might be
lower than the displayed concentration when particle concentration
is high. Appropriate coincidence correction needs to be applied
when pulse output is used for high concentration measurements.
The Pulse Output is a way to get raw particle count information.
This information is also available through serial command. Using
the SSTART,2 command, described in
Appendix B, you can read
raw, uncorrected, particle counts. TSI recommends using the
SSTART,2 command for raw counts as then all the information is
shipped which is used to calculate the corrected concentration, and
there are no issues with the counters ability to accurately count the
pulses.
Figure 3-3
Sample Digital Pulse from Pulse Output Port at the Back Panel of the CPC
Ethernet Communication Port
Instrument status including particle concentration of the Model
3775 CPC can be monitored remotely from a local area network or
over the internet using the Ethernet communication port. Ethernet
communications are described further in Chapter 7, “
Computer
Interfaces and Commands”.
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