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Figure 47. Removing the light seal.

Note

The lockdown lever is accessible just underneath the DRA base plate.

5. Slide the lever on the instrument front panel to the right.

6. Remove the front lockdown pin.

7. Tilt the front end of the accessory. Using the accessory handle, lift the DRA up and

out of the sample compartment and store it in the accompanying wooden box.

8. Replace the sample compartment front panel.

Collecting baseline scans

When taking reflectance measurements using a reflectance accessory, three types of

baseline corrections can be applied to the scan data. A simple correction is used in the

diagnostic scans that is quick and does not require zeroline or reflectance standard data.

A second and third method uses a zero baseline correction that can be applied by one of

two methods: either the sample beam can be blocked off from the integrating sphere

during the 0%R baseline scan or a light trap can be installed over the sample reflectance

port.

Note

The blocked beam method is discouraged by ASTM E 903 for reflectance

measurements because the effect of scattered light incident on the sphere wall is

not included in the data collection.

During transmission measurements, either the standard baseline or the blocked beam

method should be used. The spectrophotometer and accessory must be warmed up for 30

minutes prior to recording any of these baseline scans.

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Mantis 5000 Spezifikationen Seite 56