4-8 Model 3772/3771 Condensation Particle Counter
Data Averaging (3772 only)
When Data Logging is set to “ON”, data is averaged over selected Data
Averaging Period for saving to the flash memory card. The Data Average
Periods available are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, or 60 seconds. By
default the Data Average Period is 1 second.
To change the Data Average Period, the Data Logging option first must be
set to “OFF.” Then in the Data Average Period display, press the right
or left arrow to cycle through the available Data Average Periods.
When the desired period is displayed, press ESC to return to the User
Settings screen.
The Aerosol Instrument Manager
®
software provides more choices for data
average period. See the software manual for details. It is not
recommended you use a Flash Memory Card and Aerosol Instrument
Manager
®
software or terminal program to collect data simultaneously to
avoid data transfer interference.
Drain
The Drain feature is used as part of the process to drain butanol from the
reservoir. It opens the drain valve and turns Auto-Fill mode OFF. When the
drain is complete, Auto-Fill must be turned back on by using Auto-Fill
setting or by restarting the CPC. For specific instructions on draining
butanol, refer to the section “Draining Butanol from the Butanol Reservoir”
in Chapter 8.
On the 3772 the Drain feature is available from the User Settings
submenu. Pressing the left
or right arrow toggles Drain ON or
OFF. On the 3771 the Drain feature is controlled through the “SDRAIN”
firmware command. Refer to Chapter 7 and Appendix B for further
information on firmware commands.
Status
Status information provides data from instrument sensors useful to confirm
basic performance and for troubleshooting. The Status parameters are
described below, beginning with Saturator Temperature.
Status parameters are accessible through firmware commands for both
CPCs. Refer to Chapter 7 and Appendix B for further information on
firmware commands.
On the 3772, the parameters are also available from the Status menu. To
access the Status menu on 3772, start at the default Concentration screen
and press the up
arrow twice. The Status screen appears as shown in
Figure 4-7. Press the Enter
key to view the submenus for Status.
Toggle through submenus (status parameters) with the up
or down
arrow. Pressing ESC once returns the display to the Status
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