Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 147)

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 129
To select manual output calibration for a particular channel, activate the ANALOG I/O
CONFIGURATION MENU (See Section 6.13.1), then press:
DIAG AIO CONC_OUT_2 AUTO CAL: ON
ON ENTR EXIT
Exit to return to
the main
sample display
DIAG ANALOG I / O CONFIGURATION
PREV NEXT ENTR EXIT
DIAG AIO AOUTS CALIBRATED: NO
< SET SET> CAL EXIT
DIAG AIO CONC_OUT_2 RANGE: 5V
SET> EDIT EXIT
Toggles the
auto cal mode
ON/ OFF for
this analog
output channel
only.
DIAG AIO CONC_OUT_2:5V, CAL
< SET SET> EDIT EXIT
Press SET> to select the analog output channel to
be configured. Then press EDIT to continue
ENTR accepts the new setting
and returns to the previous
menu. EXIT ignores the new
setting and returns to the
previous menu.
DIAG AIO CONC_OUT_2 REC OFS: 0 mV
< SET SET> EDIT EXIT
DIAG AIO CONC_OUT_2 AUTO CAL: ON
< SET SET> EDIT EXIT
Now the analog output channels should either be automatically calibrated or they should be set to manual
calibration, which is described next.
6.13.4.3. Manual Analog Output Calibration and Voltage Adjustment
For highest accuracy, the voltages of the analog outputs can be manually calibrated. Calibration is done
through the instrument software with a voltmeter connected across the output terminals (Figure 6-15).
Adjustments are made using the touchscreen buttons by setting the zero-point first and then the span-
point (Table 6-20).
The software allows this adjustment to be made in 100, 10 or 1 count increments.
Table 6-20: Voltage Tolerances for Analog Output Calibration
Full Scale Zero Tolerance Span Voltage Span Tolerance
0.1 VDC ±0.0005V 90 mV ±0.001V
1 VDC ±0.001V 900 mV ±0.001V
5 VDC ±0.002V 4500 mV ±0.003V
10 VDC ±0.004V 4500 mV ±0.006V
NOTE
Outputs configured for 0.1V full scale should always be calibrated manually