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 MORE  VARS: Internal Variables (VARS) 

The GFC 7000TA has several-user adjustable software variables, which define certain operational 
parameters.  Usually, these variables are automatically set by the instrument’s firmware, but can be 
manually re-defined using the VARS menu.  Table 6-14 lists all variables that are available within the 818 
password protected level. 

 

Changes the internal data acquisition system (DAS) hold-off 
time, which is the duration when data are not stored in the 
DAS because the software considers the data to be 
questionable.  That is the case during warm-up or just after 
the instrument returns from one of its calibration modes to 
SAMPLE mode.  DAS_HOLD_OFF can be disabled entirely 
in each DAS channel. 

Can be between 0.5 

and 20 minutes 

Default=15 min. 

Allows the user to set the number of significant digits to the 
right of the decimal point display of concentration and 
stability values. 

AUTO, 1, 2, 3, 4 

Default=AUTO 

Selects which gas measurement is displayed when the STABIL 
test function is selected. 

CO

2

 & O

2

1 

Dynamic zero automatically adjusts offset and slope of the 
CO

2

 response when performing a zero point calibration 

during an AutoCal (Section 7). 

ON/OFF 

Dynamic span automatically adjusts slope and slope of the 
CO

2

 response when performing a zero point calibration 

during an AutoCal (Section 7). 

Note that the DYN_ZERO and DYN_SPAN features are not 
allowed for applications requiring EPA equivalency. 

ON/OFF 

Adjusts the speed of the analyzer’s clock.  Choose the + 
sign if the clock is too slow, choose the - sign if the clock is 
too fast. 

-60 to +60 s/day 

1

 O

2

 option is only available in analyzers with O

2

 sensor options installed.