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Advanced Features Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 129
7.4. USING THE GFC 7001E/EM ANALYZER’S ANALOG
OUTPUTS.
The GFC 7001E/EM Analyzer comes equipped with four analog outputs.
The first two outputs (A1 & A2) carry analog signals that represent the currently measured concentration
of CO (see Section 6.6.2).
The third output (A3) is only active if the analyzer is equipped with one of the optional 2
nd
gas sensors (e.g.
O
2
or CO
2
).
The fourth output (A4) outputs a signal that can be set to represent the current value of one of several test
functions (see Table 7-10).
7.4.1. ACCESSING THE ANALOG OUTPUT SIGNAL CONFIGURATION
SUBMENU
The following lists the analog I/O functions that are available in the GFC 7001E/EM Analyzer.
Table 7-6: DIAG - Analog I/O Functions
SUB MENU
OUTPUT
CHANNEL
FUNCTION
MANUAL
SECTION
AOUT
CALIBRATED
ALL
Initiates a calibration of the A1, A2, A3 and A4 analog output
channels that determines the slope and offset inherent in the
circuitry of each output.
These values are stored and applied to the output signals by
the CPU automatically.
7.4.3
CONC_OUT_1
A1
Sets the basic electronic configuration of the A1 output (CO
Concentration).
There are four options:
RANGE
1
: Selects the signal type (voltage or current loop)
and level of the output.
REC OFS: Allows them input of a DC offset to let the user
manually adjust the output level.
AUTO CAL: Enables / Disables the AOUT CALIBRATED
feature.
CALIBRATED: Performs the same calibration as AOUT
CALIBRATED, but on this one channel only.
7.4
CONC_OUT_2
A2
Same as for CONC_OUT_1 but for analog channel A2.
CONC_OUT_3
A3
Same as for CONC_OUT_1 but for analog channel A3 but
only if either the optional O
2
or CO
2
sensors are installed.
TEST OUTPUT
A4
Same as for CONC_OUT_1 but for analog channel A4
(TEST CHANNEL).
7.4.6
AIN
CALIBRATED
N/A
Initiates a calibration of the A-to-D Converter circuit located on
the Motherboard.
7.4.7
1
Any changes made to RANGE or REC_OFS require recalibration of this output.