Personal Ozone Monitor Manual Rev. E-2
13
If you have data in the logger that you want to keep, be sure to download it (see
Section 5.9 below) before starting logging. Select
Yes
if you are sure you want to
start logging new data. This will return you to the
Dat
submenu. Select
to return to
the main
Menu
, and select
again to exit the Menu and start making measurements.
As previously mentioned, n
ote that “
” always takes you up one level in the menu.
If data are being logged and averaged, the log number and the number of new
measurements made for the next average (minus 1) are displayed in place of the date
and time; e.g.,
Avg O3= 29.1 ppb
Log= 193:4
where
Avg O3
is the average ozone value most recently written to the logger, and the
current log number is 193. The “4” in 193:4 refers to the number of 10-s data points
that have been measured so far for inclusion in the next average to be displayed and
logged. If 1-min averaging is used, this number will increment from 0 to 5; for 5-min
averaging, the number will increment from 0 to 29; and for 1-hr averaging, it will
increment from 0 to 359. This number is displayed so that the user will know how
many more 10-s measurements need to be made before a new average is displayed
and logged.
Note that entering the menu will interrupt the averaging interval that is in progress,
and the averaging interval will start over when the menu is exited and measuring is
resumed.
If there is a power failure while the instrument is in the logging mode, logging will
resume afte
r power is restored. A note of “Data Interruption”
will be written to the
logger prior to writing the first new data line. The instrument can accommodate
multiple data interruptions due to power failures. For example, one can purposely
switch the instrument off, move to another location and restart logging simply by
turning the instrument back on. Data sets will be separated by the data interrupt
message.
5.7.
To Stop Logging Data
Hold in the Select button to obtain the main
Menu
. Go to the
Dat
submenu by clicking
on
Dat
. Select the
End
function. This will end data logging. You may now return to
the
Dat
menu to transmit the data to a computer by selecting
Xmt
(see below). The
stored data will reside in memory (even when new measurements are being made)
and can be transmitted using the
Xmt
function as often as you like.
Note: All stored data are lost once logging is started again using
the Log function.
Thus, you should always transmit your data to a computer before
restarting logging.
