Configuring the CPC 4-5
Question Answer Explanation
DET The [DET]ector voltage is a measure of the light
scattered from particles as detected by the
photodetector. The DET should be
0 ± 0.050 volts when no particles are passing
through the sensor (either the air is clean or
the pump is off). The DET for any given particle
concentration is found from the calibration
data, on or off the calibration plot, in
Appendix D.
Baud? 110
300
600
1200
2400
4800
9600
19200
Baud rate for RS-232 communication
Default
Parity? Even
None
Default
Calibrate? N
Y
No
Yes. To enter calibration of D/A, A/D and flow.
D/A Zero To calibrate the D/A zero, measure the voltage
from the Analog Output jack on the back panel
with a digital voltmeter.
Note: This step is independent of your
selection for the analog output above.
Remove the top cover of the CPC. Adjust
potentiometer RA2 on the Display board
(Figure 4-1) to 0 ±1 mV. Press the Display
button.
D/A 10v Measure the voltage from the Analog Output
jack. Adjust potentiometer RA1 on the Display
board (Figure 4-1) to 10 V ±1 mV. Press the
Display button.
Cal A/D? N
Y
No
Yes: Answering yes uses the D/A 10-volt
output that you just set as a reference in order
to set the A/D 10-volt output.
Det 0.000v This is the photodetector zero. Adjust
potentiometer RA6 (Figure 4-1) so the display
reads 0.000 ±0.001. Press the Display button.
continued
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