TSI Instruments 3760, Инструкция по эксплуатации, Страница: 16 / 22

Setup and Operation 2–7
Figure 2-4
Front-Panel’s Main Circuit Board for the CNC; Viewed from the Back
For maximum accuracy, compute the actual particle concentration according to the
following equation:
N
a
= N
i
exp (N
a
Q t)
where N
a
= the correct concentration (particles/cm
3
)
N
i
= the indicated concentration (particles/cm
3
)*
Q = 46.7 cm
3
/s
t = 0.25 microsecond is the effective time each particle resides in
the viewing volume
The
N
a
in the exponent can be approximated by N
i
.
Calibrating the CNC Apart from the optics alignment, the initial factory checkout of the electronics, and
the periodic flow verification, the CNC requires no calibration. The flow is
controlled by a critical orifice, and thus, no