Operation
Diagnostics Menu
Thermo Electron Corporation Model 48i Instruction Manual 3-81
Sample/Reference Ratio The Sample/Reference Ratio screen (read only) displays the ratio of the
intensities of the light source through the sample (CO) side and reference
(N2) side of the correlation wheel. Normally, when zero air is being
sampled, the sample/reference ratio is between 1.14 and 1.18. A ratio
outside may indicate that the correlation wheel is dirty or leaking gas.
• In the Main Menu, choose Diagnostics > Sample/Ref Ratio.
• Press to return to the Diagnostics menu or to return to
the Run screen.
AGC Intensity The AGC Intensity screen (read only) displays the intensity (in Hertz) of
the reference channel Automatic Gain Control (AGC) circuit. The AGC
circuit optimizes the noise and resolution levels of the Model 48i. The AGC
intensity reading should be about 250,000 Hertz.
• In the Main Menu, choose Diagnostics > AGC Intensity.
• Press to return to the Diagnostics menu or to return to
the Run screen.
XXLO WCONCENTRATIONXXLO W
CO 15.80 PPM
SAMPLE 12:34 ALARMx
SAMPLE REFERENCE RATIO:
S/R 1.1611
RANGE AVG DIAGS ALARM
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