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M300EU M300EU OPERATING INSTRUCTIONS
(Addendum to M300EU Manual - P/N 04145)
6.3. SETUP Æ RNGE: ANALOG OUTPUT REPORTING
RANGE CONFIGURATION
6.3.1. PHYSICAL RANGE VERSUS ANALOG OUTPUT REPORTING
RANGES
Functionally, the M300EU analyzer has one hardware “physical range” that is capable of determining CO
concentrations between 0 ppb and 100,000 ppb. This architecture improves reliability and accuracy by avoiding
the need for extra, switchable, gain-amplification circuitry. Once properly calibrated, the analyzer’s front panel
will accurately report concentrations along the entire span of its physical range. M300EU analyzer’s physical
range can create data resolution problems for most analog recording devices. For example, in an application
where the expected concentration of CO is typically less than 1000 ppb, the full scale of expected values is only
1% of the instrument’s 100,000 ppb physical range. Unmodified, the corresponding output signal would also be
recorded across only 1% of the range of the recording device.
The M300EU solves this problem by allowing the user to select a scaled reporting range for the analog outputs
that only includes that portion of the physical range relevant to the specific application.
NOTE
Only the reporting range of the analog outputs is scaled.
Both the iDAS values stored in the CPU’s memory and the concentration values reported on the front
panel are unaffected by the settings chosen for the reporting range(s) of the instrument.
6.3.2. ANALOG OUTPUT RANGES FOR CO CONCENTRATION
The analyzer has two active analog output signals related to CO concentration that are accessible through a
connector on the rear panel.
Not Used on M300EU
A
NALOG OUT
A1 A2
A
3
A
4
+ - + - + - + -
CO concentration
outputs
HIGH range when DUAL
mode is selected
Test Channel
Output
LOW range when DUAL
mode is selected
Figure 6-2: Analog Output Connector Pin Out
05514 Rev A1 23