Mantis 5000 Dokumentacja Pobierz pdf (Strona 46)

• Black ceramic tile

• Colored tiles

• Aluminium mirrors

• Absorbing glass

NPL also have transmittance standards of neutral glass filters with transmittance

values of 0.92 to 0.001.

Contact:

Division of Electrical Science

National Physical Laboratory

Teddington, Middlesex

TW11 OLW

Troubleshooting

Warning

This accessory contains electrical circuits, devices and components

operating at dangerous voltages. Contact with these circuits, devices and

components can cause death, serious injury, or painful electrical shock.

Operators and other unauthorized personnel must never remove the

cover. This must be opened only by Varian-trained, Varian-qualified or

Varian-approved service engineers.

Problem Solution

Measurements on

standard materials are no

producing certified value

Ensure that you are referring to the hemispherical

reflectance values of the SRM, not the directional and

hemispherical values.

Ensure that your PTFE disks are clean and in good

condition.

If you are calibrating the PTFE disk, you need only apply

the necessary correction to your measured values.

The signal-to-noise ratio

is low

This can be caused by degraded sphere coating, poor

detector performance, the lamps requiring replacement,

unclean mirrors or lens or bad alignment.

Check the reflectance port image, and re-align the accessor

if necessary.

Check that the lens and mirrors are clean, and carry out a

Zero %R error check

Failure to initialize

Ensure that that PTFE reference disc is in the reflectance

port.

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Mantis 5000 Dokumentacja Strona 46