Campbell Scientific TGA100 Trace Gas Analyzer Manual - Manual (Page 43)

3.6.6 Header Files
Any time a concentration, gradient, or site means file is created, a header file called MMDDHHMM.hdr is also created,
unless a header file is already open. The file may already open, for example, if 10 Hz concentration data collection is
started, and then either the gradient or site means mode is started. In this case the same header file is used, with
additional lines written to give information for the second data collection mode.
The header file is always ASCII (plain text) format and contains the following information:
TGA software version
Gas Mnemonic
Date
Site
Laser serial number
Column definitions for 10 Hz data file
Column definitions for 1-minute data file
Data collection start time
User messages
Error messages
3.6.7 User Messages
To enter a time-tagged user message in the header file, press <alt-C> at the real time screen, then type the message text
and press <enter>. For convenience, a predefined set of user messages is stored in the TGAHDR.MSG file in the
TGADATA directory. To use these messages, press a function key after <alt-C>. The corresponding text (defined in
the table below) will appear in the window, where it can be edited before pressing <enter>. Note that '~F#' represents
the 'shift F#' key combination and that '^F#' represents the 'control F#' combination. This list of comments is defined by
the TGAHDR.MSG file in the TGADATA directory. This is an ASCII (plain text) file, and it can be edited to create
custom messages. If the file does not exist, the default comments listed in Tab
will be used. le 8
Table 8. Default Comments for Header Files
Function Key Shift + Function Key Control + Function Key
{ F1} 'sunny', {~F1} 'high winds', {^F1} 'acetylene application',
{ F2} 'partly sunny', {~F2} 'low winds', {^F2} 'system noisy',
{ F3} 'cloudy', {~F3} 'no winds', {^F3} 'poor vacuum',
{ F4} 'raining', {~F4} 'low pressure', {^F4} 'refilled LN2',
{ F5} 'thunder storms', {~F5} 'high pressure', {^F5} 'adj. laser temp',
{ F6} 'hot', {~F6} 'water irrigation', {^F6} 'adj. laser current',
{ F7} 'warm', {~F7} 'NH4+ application', {^F7} 'conc. grad. site',
{ F8} 'cool', {~F8} 'NO3- application', {^F8} 'eddy correlation site',
{ F9} 'cold', {~F9} 'carbohydrate application' {^F9} 'point source site',
{ F10}'freezing', {~F10}'manure application', {^F10}'delete above comment'
43