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DS-421.DOC 

Description: 

The A

cton

 Model DS-421 is a 30 watt deuterium light source system designed for 

use with 

Acton

 series spectrometers.  It consists of a 30 watt deuterium 

lamp (Hamamatsu p/n L591), housing with light source collections mirror and fan, 
interconnecting cable, and deuterium power supply.  The lamp is factory installed 
and aligned prior to shipment.   Adjustments are provided on the light collecting 
mirror mount in the event that realignment becomes necessary. 
 

Mounting: 

For proper operation, the lamp housing should be mounted to the entrance slit of the 
spectrometer.  The light collection mirror, located inside the lamp housing, is 
designed to focus light from the lamp onto the entrance slit of the spectrometer.  To 
mount the lamp housing to the entrance slit, the following procedure is 
recommended: 
 

1.  Locate the two (2) shoulder screws and the two (2) 8-32 cap screws supplied 

with the DS-421.  Insert the shoulder screws into the two bottom outside 
tapped holes of the entrance slit of the spectrometer and tighten the screws.  
These are sued to mount the lamp housing. 

 
2.  Remove the four (4) slotted screws from the top of the lamp housing, then 

remove the cover. 

 

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DO NOT TOUCH THE LAMP (BULB) OR THE SURFACE OF THE 

FOCUSING MIRROR 

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3.  Carefully slide the two (2) “key hole” type slots of the lamp housing mounting 

flange over the shoulder screws in the entrance slit of the spectrometer.  Insure 
that the top two holes of the lamp housing mounting flange align properly 
with the top tow tapped holes of the spectrometer entrance slit. 

 
4.  Insert the two (2) 8-32 cap screws in the top two holes of the lamp housing 

mounting flange and tighten the screws. 

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