Mantis 5000 Specifikace stáhnout pdf (Strana 79)

8. Remove the specular port plug and install the light trap in its place and click the Start

button to collect the diffuse-only data.

9. From the main Scan window, click on the Calculator icon

to open the open the

Maths dialog.

10. On the graph displayed, highlight the first scan (of the total reflectance), by clicking

on it. When the scan is selected, it will be highlighted in red.

11. From the Maths dialog choose Selected Trace and then the ’-’ (minus) sign.

12. On the graph displayed, highlight the second scan (of the diffuse-only reflectance),

by clicking on it. When the scan is selected, it will be highlighted in red.

13. From the Maths dialog choose Selected Trace and then the ’=’ (equal) sign.

14. The results of this specular data equation will be displayed in a new graph.

Measurement calibration and corrections

Calibration

The detector calibration functions store separate sets of correction factors for the

instrument detectors and for the DRA detectors, so both require calibrations. The

instrument will recognize when an external DRA has been connected to the instrument

and will restore any previous calibrations stored in the external DRA.

Calibrations are performed using the Validate application, under the Calibration menu.

Caution

Both instrument and DRA are calibrated at the factory and should be recalibrated only

when tests indicate the need for it.

When should I perform a calibration?

Below are some common reasons that may indicate the necessity for calibration.

Calibrate PGA (Programmable Gain Amplifier)

PGA calibration should be executed each time a DRA is installed in a Cary instrument

for the first time, and after each time it is removed. At other times, the need for it may be

seen on an uncorrected baseline as steps or plateaus or on a corrected baseline as small

spikes-either positive or negative.

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Mantis 5000 Specifikace Strana 79