Manual, Ultra High Sensitivity Aerosol Spectrometer (UHSAS)
DOC-0210 Rev E-4
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© 2017 DROPLET MEASUREMENT TECHNOLOGIES
4.3 Perform a Zero-Count:
1)
Ensure the zero-count filter is in place, as shown in Figure 11.
2)
Select the
Histogram
tab to display counts versus bin number.
3)
Click on the
Run
button near the upper left corner of this window to show the particle
accumulations. There should be very few counts.
4)
Remove the zero filter for room air sampling. Many counts should appear.
4.4 Check Instrument Performance:
1)
Introduce a collection of 100-nm particles into the inlet. The NIST SRM 1963 100 nm work
well. These are standard reference particles used during factory calibration.
2)
The histogram should show a tight distribution with a peak near 100 nm (Figure 12). There
should be relatively few particles in bins below and above the peak. The instrument may
need calibration the peak is poorly resolved with a broad distribution of particles (Figure
13). Calibration may also be required if the peak is significantly higher or lower than 100 nm.
through
Figure 15 are from an older version of the software; however, for
the situations described, the histogram shapes will appear similarly in the new software.
Figure 11: Zero Filter on Top of UHSAS Unit
