Teledyne Model 300EU Setup Æ Rnge Analog Output Reporting Range Configuration, M300EU, Rev A1

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.

ANALOG OUT

CO concentration

outputs

A1 A2 + - + -

Not Used on M300EU

Test Channel

Output

A3 A4 + - + -

LOW range when DUAL	HIGH range when DUAL
mode is selected	mode is selected

Figure 6-2: Analog Output Connector Pin Out

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