Mantis 5000 Specifiche Scaricare il pdf (Pagina 35)

Figure 16. The sample mount ledge.

13. Click the Start button. The Save As dialog box will appear, allowing the

method to be saved as either a data file or a batch file. If the file is saved as a

batch file, all of the method parameters will be stored with the scan.

This procedure will measure the % reflectance relative to the PTFE reference disk.

Note

To determine the absolute diffuse reflectance of a sample, you need to purchase

an NBS standard and calibrate your PTFE disks. The NBS standards SRM

2021 (a black porcelain enamel tile) or SRM 2019c (a white ceramic tile) are

suitable for this purpose.

To determine position and size of the image

To determine the position and size of the image so that samples can be mounted

correctly, follow this procedure:

Note

Initialize the Cary instrument before placing the DRA into the sample

compartment. After initialization, place the DRA into the compartment.

Do not turn the accessory on (i.e., do not plug the DRA into the instrument).

1. Click the Goto button in the Scan application.

2. Select the Zero order check box and click OK. The spectrophotometer will

drive to 0 nm and select the Vis lamp.

3. Place a piece of white paper in front of the sample clamp. The image size

should now be visible.

NIR reflectance measurements (Cary 5000 and 6000i)

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.

Follow steps 1 to 6

of the transmission measurements procedure then:

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 48 49

Nessun commento

Mantis 5000 Specifiche Pagina 35