SPARO Electronics

Viper Heaters

documentation on the backup (Macintosh) mirror heater system:

• instructions for switchover - with photos

problems that developed following the computer situation in early May:

• Paolo's report of May 20th
• Information from Martin and Mark (May 21st)
• More information from Paolo (May 22nd)
• More information from Martin (May 22nd)

problems that occurred after the mid-April power outage:

• photo of heater chassis
• chat between Paolo and Giles
• electronics system logs
• mirror system logs

miscellaneous documentation from March, inlcuding channel-mapping:

• current status of plotting capabilites
• channel mapping

Noise Characteristics

• Detector noise (i.e. noise at 0.3 K) Feb. 2000
  
• JFET noise (i.e. noise at 4 K) Feb. 2000
  

Specific Kinds of Noise Affecting the Individual Pixels

• Characteristics of individual pixels. 7/21/99
• Numbering system used for pixels. 7/21/99

Electronic Characteristics

• Summary table of loadcurves done from 10/98 to 1/99 6/14/99
  

Electronics Tests

• Standard electronics tests - previously done before and after each cooldown; now done somewhat less frequently
  
• Load Curves of August 25,1998

Documentation on SPARO Electronics

• JFET pinout
  
• Dewar wiring plan
  
• Preamp schematics
  
• Miscellaneous photos of SPARO electronics

Miscellaneous Electronics Specifications and Milestones

System Integration and Test

• SUMMER '98: Progress on eliminating microphonics seen at CSO
  
• Photo of the arrays, tensioned wires, 4K board and JFET board on the mock cold surface plate. 2/26/98
• Tensioned wires assemblies running from arrays to 4K surface are completed (B. Hirsch) 12/19/97. photos!
• Giles' summary of instrument package layout. 8/1/97

Arrays

• Array boards are in!!! (10/20/96)
• Array board layout, both sides, ground plane removed. (Jesse Wirth 09/09/96)
• Array board, solder side, with ground plane. (Jesse Wirth 06/19/96)
• Array board, conductor side, with ground plane. (Jesse Wirth 06/19/96)

Bolometers

• Darren has made up our bolomemeters! Thanks! 4/9/97.
• The bolometers have been installed in the arrays (by J. Wirth). 12/19/97
• Circuit diagram

JFets

• We're using InterFET 2N6451 in dual packages
• Preliminary JFet board layout from J. Wirth. 5/20/97
• JFet box concept drawing from J. Wirth. 5/20/97
• Giles' estimate of the heat dissipated by the JFets. 2/13/97
• Rough heat tally of preliminary JFet box design. 5/28/97
• Gate current tests done on InterFET 2N6451 8-6-98
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Data System

• Data System ask is underway! Here's Tom McMahon's email outlining the parts. 6/10/97