SPECORD PLUS
Installation and commissioning
21
Monochromator
transport lock
Upstream monochromator
transport lock
(SPECORD 250 PLUS only)
Figure 14Transport locking screws on the rear of the SPECORD PLUS
Fastening the transport locks
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Switch off the SPECORD PLUS with the aid of the software to bring the monochro-
mator into the correct position:
– Switch on the SPECORD PLUS.
– Switch on the computer and start the ASpect UV program.
– Wait for the initialization message to disappear.
The SPECORD PLUS must be in measuring mode.
– Select menu item File | Close in the main ASpect UV window.
– Wait until the ASpect UV program has ended.
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Switch off the SPECORD PLUS.
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Turn the transport locking screw(s) clockwise (to "fixed" on the sticker) with the Allen
key until it stops.
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Place the Allen key back into one of the foam blocks and fasten the blocks between
the support rods.
5.4
Checking and correcting the adjustment
The SPECORD PLUS is fully adjusted and set up ex factory. Changes in the adjustment
caused by transport and temperatures are corrected by the ASpect UV program without
requiring mechanical intervention in the device.
Correction must be carried out in the following situations:
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Initial installation
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Lamp replacement
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Regularly every 3 months
The following parameters are checked during the basic correction and corrected if neces-
sary:
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Offset (dark current)
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Zero order of the lamps
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Amplifier stages of the receivers
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Wavelength correction using internal holmium filter and UV lamp
On the SPECORD 250 PLUS, a grid correction is additionally performed and the grid of
the upstream monochromator is aligned with the grid of the main monochromator.
