Computer Interface and Commands 7-5
Flash Memory Card Specification (3772 only)
A file is created on the Flash Memory Card when the Data Logging option
is turned ON from the front panel of the 3772. Each file will contain one
hour of data, unless the run is stopped early with the STOP option. See
Chapter 4.
Each file has this format:
LINE 1: “TSI CPC DATA VERSION 1”
LINE 2: start time of this file (the first number is the total number of
seconds elapsed from midnight Jan. 1, 1970)
LINE 3: data average interval in seconds
LINE 4: Instrument model number, firmware version number, instrument
serial number (result of the “RV” command)
LINE 5: first data set
LINE 6: second data set
LINE X: last data set
The data sets are defined as counts, concentration, analog input 1, analog
input 2, status. These data sets are saved every average interval so if the
average interval was one minute, the counts would be total counts
(coincidence-corrected) over the last minute, etc. Instrument operates in
normal condition if the status bit shows zero. A nonzero status indicates
that some operating parameters deviate from normal conditions. See RIE
command in Appendix B.
Every time a user begins a new run, a unique file will be created with the
date and time as the file name.
Www_Mmm_dd_hh_mm_ss_yyyy
Where Www is the weekday, Mmm the month in letters, dd the day of the
month, hh_mm_ss the time, and yyyy the year.
Disclaimer: Due to the fact that the FAT file systems are by design not
power fail-safe, if power is lost, part or all of the file system may be lost.
Note: Keep the amount of data stored in the flash memory card under
64 MB to avoid long overhead time before generating a new data
file each hour in the card.
Flash Memory Card Formatting Issue
On Model 3772 CPCs shipped before January 2008, the unit’s internal
flash memory card had a formatting issue. This caused the card to appear
full when the number of logged data files got much above 100, which
resulted in the unit freezing up at the end of taking run data. To solve this
issue, follow the steps below to reformat the card.
1. Power on the instrument and connect a USB cable to it from your
computer. The flash memory card will appear as a separate disk drive
in Microsoft
®
Internet Explorer
®
browser.
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