Mantis 5000 Specifiche Scaricare il pdf (Pagina 33)

that the instrument to be turned on and off at various times. It is important to take care

that you follow these steps as failure to do so can cause damage to your DRA.

Reflectance measurements (%R)

The sample should be homogeneous, substantially flat, and large enough to

completely cover the image. Finely powdered samples may be studied using a

powder cell

. There is also a mounting option available for small samples.

When measuring diffuse only reflectance, position the sphere cap with the 'D' mark

up. Position the 'S' mark up to measure the specular+diffuse (total) reflectance.

When performing measurements on glossy materials (high specular component), use

the protruding reference plate. The reference surface protrudes into the sphere and

behaves more nearly like a perfect diffuser. As discussed in the Differences between

the standard and sample section, you should use reference materials with similar

reflectivity and properties to the sample.

Figure 15: Reference disks supplied with the DRA. The large reference plate (a), and

the protruding reference plate (b).

Note

Parameters activated by a radio button that are not specifically mentioned in the

following procedure should be set to 'Off' (e.g., the Signal-to-noise mode radio

button). These parameters will not affect the procedure.

1. After you have carried out the Alignment procedures, turn off the instrument.

2. Plug the DRA into the instrument using the communications plug, it fits into

the green plug at the back of the instrument's sample compartment.

3. Cover the reflectance port with a PTFE reference disc.

Caution

Before turning on your instrument you must cover the reflectance port with a PTFE

reference disc to prevent damage to your DRA.

4. Install the extended sample compartment

5. Close the sample compartment lid.

6. Turn on the instrument, allow the instrument to initialize.

7. Click the Windows Start button, then Programs, Cary WinUV and then Scan.

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Mantis 5000 Specifiche Pagina 33