Teledyne GFC 7001EM operation manual Using the GFC 7001E/EM ANALYZER’S Analog Outputs

Advanced Features Model GFC7001E Carbon Dioxide Analyzer

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 2nd gas sensors (e.g. O2 or CO2).

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	FUNCTION	MANUAL
	CHANNEL		SECTION
		Initiates a calibration of the A1, A2, A3 and A4 analog output
AOUT		channels that determines the slope and offset inherent in the
	ALL	circuitry of each output.	7.4.3
CALIBRATED
		These values are stored and applied to the output signals by
		the CPU automatically.
		Sets the basic electronic configuration of the A1 output (CO
		Concentration).
		There are four options:
		 RANGE1: Selects the signal type (voltage or current loop)
CONC_OUT_1	A1	and level of the output.
		 REC OFS: Allows them input of a DC offset to let the user
		manually adjust the output level.	7.4
		 AUTO CAL: Enables / Disables the AOUT CALIBRATED
		feature.
		 CALIBRATED: Performs the same calibration as AOUT
		CALIBRATED, but on this one channel only.
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 O2 or CO2 sensors are installed.
TEST OUTPUT	A4	 Same as for CONC_OUT_1 but for analog channel A4	7.4.6
		(TEST CHANNEL).
AIN	N/A	Initiates a calibration of the A-to-D Converter circuit located on	7.4.7
CALIBRATED		the Motherboard.

1 Any changes made to RANGE or REC_OFS require recalibration of this output.

Teledyne Analytical Instruments 129