USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
50
File Transfer Menu
Use the
File Transfer menu to access data collected by the analyzer.
Each time the analyzer is re-started, the most recent file name is displayed in the
form: xxx_2020-12-29_f0001.txt, where the:
o
First characters represent the analyzer model (Example: n2o-co)
o
Next 10 characters represent the date (yyyy-mm-dd)
o
Last four numbers are a serial number.
The serial number counts upward to provide up to 10,000 unique file names each
day.
If the analyzer is left in continuous operation, a new data file will automatically be
created every 24 hours to keep data file sizes manageable.
Standard Data File
Data files are written in text (ASCII) format and contain labeled columns displaying:
The time stamp of each recorded measurement
Gas concentration
Cell pressure (Torr)
Cell temperature (Celsius)
Ambient Temperature (Celsius)
Ring-Down Time (microseconds)
The format can be changed in the
Time/Files menu of the Setup panel. (Figure 40)
Figure 33 shows a typical data file for the GLA351-N2OCM.
Figure 33: The Beginning of a Typical Data File
For each measurement there is an adjacent column reporting the standard deviation of the
measurement (with sd suffix).
The standard deviation is zero when the analyzer is running at 1 Hz, as no averaging
of data has taken place.
At speeds slower than 1 Hz, the standard error of the average is reported.
At the end of each data file are encoded listings of settings used by the analyzer for
that data file. Settings are typically stored for diagnostic or troubleshooting
purposes.
