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May 12, 2004 
E:\Manuals\Controller\ST-133B\ST-133B Addendum.doc 
 
ST-133 Controller 
Addendum 
Introduction 
Thank you for purchasing a Princeton Instruments cameras system. Princeton Instruments 
is presently phasing in a new improved version of the ST-133 Controller. Depending on 
the ship date of your system and the status of manual revision, we are including this 
addendum to point out the differences between the ST-133A and the ST-133B (see 
Figure 1).  All operating instructions in this manual apply to the new Controller. 
 
Old ST-133A Version 
 
 
New ST-133B Version 
Figure 1. ST-133A Controller (left) and ST-133B (right) 
The design changes include: 
• 
Case redesign 
• 
Power switch re-location and replacement 
• 
Increased Power Rating and changed fuse requirements  
Case Redesign 
As part of the repackaging and enhancement of the ST-133 Controller, the ST-133A's 
paneled case has been replaced with a sleeve-type case for the ST-133B. This construction 
reduces electronic noise generated by variations in grounding. In addition, this redesign and 
other mechanical modifications have reduced the weight by 0.5 lbs/.23 kg. 
Note: Please use the front and back bezels to move and carry the Controller (see Figure 2 on 
the next page).