Model 202 Ozone Monitor Manual Rev. J-4
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Again 193 refers to the most recent log number. 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 10-s averaging is used (i.e., no averaging), this number
will always be 0. 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.
If there is a power failure while the instrument is in the logging mode, logging will
resume after power is restored. A note of
Data Interruption
will be written to the logger prior to writing the first new data line. In the case of a
power failure, 1 data line may be lost.
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 and the data will be
logged with the correct date and time.
3.10. To Stop Logging Data Using the Internal Data Logger
Hold the Select button down to obtain the Menu. Go to the Dat submenu by clicking
on Dat. Choose and click on the End function. This will end data logging. You may
now transmit the data to a computer by clicking on Xmt (see below). Alternatively,
you may return to the Menu by clicking on . 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. However, 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.
If you fail to End logging prior to transmitting the data using the Xmt function, the
instrument will automatically execute the End function for you prior to transmitting the
data.
3.11. To Transmit Logged Data to a Computer Using the Serial Port
Connect the serial port of the instrument to the serial port of your computer using the
cable provided. If your computer does not have a serial port, you can use the USB
port by means of a serial-to-USB adapter. Such adapters are available in most
computer stores or can be supplied by 2B Tech.
Start your data acquisition software, such as the 2B Technologies Display and
Graphing Software, which is available for free download from 2B Tech’s website,
https://www.twobtech.com/downloads.html. See Appendix A of this manual for
information about working with this software.
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