TSI Incorporated 8587A, Operation And Service Manual

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Instrument Operation 4-7
P e r f o r m i n g a F i l t e r T e s t
Performing a filter test is very similar to performing fit testing described in
the previous section. The UPSTREAM sample is drawn from the filter
holder, providing the challenge aerosol. The DOWNSTREAM sample is
taken after the filter.
Filter efficiency is calculated as a percent from the following equation;
n Penetratio % 100 Efficiency %
voltage Zero voltage Upstream
voltage Zero voltage Downstream
n Penetratio
100
voltage Zero - voltage Upstream
voltage Zero - voltage Downstream
n Penetratio %
 



 