PerkinElmer Lambda 650, Руководство по оборудованию

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Lambda 650/850/950 Hardware Guide . 27
To permit minimum sample volumes to be measured in micro cells, the height of the
radiation beam must be reduced in the active cell area.
A common beam mask (CBM) is mounted between the slit assembly (SA) and mirror M7. This
mask restricts the cross-section of both the sample beam and the reference beam in the
respective cell area. The radiation beam can be reduced from the maximum height of 11.7
mm to 0.0 mm in 50 steps.
During all scanning operations, the monochromators stop slewing while a filter, source, or
detector change is in progress.
NOTE:
You can select the source or detector change wavelength within a defined wavelength range.
This facility is useful if a feature of special spectral interest is located at one of the default
change wavelengths.
The spectrometer scans from higher toward lower wavelengths.
There is an optional depolarizing filter (D
P
) accessory, which can be swung into the beam.
There are internal attenuators for the Lambda 850 and 950 which can be swung individually
into the sample beam (SBA) and the reference beam (RBA). The attenuators have the
values: 0%, 1%, 10% and 100%. The Lambda 650 requires manual attenuators to be
placed as required (L6020277 – 10% attenuator, L6020276 – 1% attenuator).