Honeywell ACM 150 - Evaluating;Resolving the ZPD Position; Evaluating;Resolving Spectral Balance; Figure 82. Normal Background Spectrum; Figure 83. Abnormal Background Spectrum

ACM 150
127
10.4.4. Evaluating/Resolving the ZPD Position
For the Perkin Elmer bench, start up the Perkin Elmer software and perform diagnostics.
If the problem remains, contact Honeywell for service assistance.
10.4.5. Evaluating/Resolving spectral balance
You evaluate the spectral balance using a Background spectrum. A Background spectrum
is provided in “Background Scan.” Figure 71. It should look like Figure 82, having the same
overall shape and peaks.
Figure 82. Normal Background Spectrum
Figure 83. Abnormal Background Spectrum
1. Compare your Background spectrum to the spectrum shown in Figure 82. Note the
intensity of region A (2000 cm
-1
) and region B (4000 cm
-1
)
2. The intensity at region B should be at least 20% of the intensity at region A. If it is
20% or higher, the spectrum is balanced. If less than 20%, the spectrum is
imbalanced and has an inadequate S/N in region B. This is resolved by cleaning (or
replacing) the gas cell and improving alignment.
3. Follow the instructions in Servicing the gas cell.