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(gauge on order)
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=Current Status=
=Current Status=


Cleaning and assessment in progress.
Powers up until reporting "Beam Fail," so it won't image.


July 18: Roughing pump works, turbo spins up to full speed. The vacuum controls operate but don't light up as expected, and the pressure readout is not showing a reading. The console turns on and produces video output with the correct data overlay. The filament control reads "bad filament," despite the filament continuity being OK. There is an interlock between the pressure gauge and console that may be keeping the filament off. We'll need to verify the pressure gauge output and see how to trigger that interlock. We are currently waiting for MKS to deliver on our order of a MicroPiriani 925 vacuum gauge, expected now in January 2017.
Roughing pump works, turbo spins up to full speed for a while but then slows down. The vacuum controls operate but don't light up as expected, and the pressure readout is not showing a reading. The console turns on and produces video output with the correct data overlay. The filament control reads "bad filament," despite the filament continuity being OK. There is an interlock between the pressure gauge and console that may be keeping the filament off. We'll need to verify the pressure gauge output and see how to trigger that interlock.  
 
We received and installed an MKS Micropiriani 925 vacuum gauge that measures vacuum up to atmosphere. Next: Pump down the chamber and see what the pressure is, locate any leaks and address them.


See [[Stereoscan_Operators_Log]] for details.
See [[Stereoscan_Operators_Log]] for details.

Revision as of 05:31, 24 February 2017

HacDC is in the process of refurbishing a scanning electron microscope: a Cambridge Stereoscan 200.

SEM in workshop

Current Status

Powers up until reporting "Beam Fail," so it won't image.

Roughing pump works, turbo spins up to full speed for a while but then slows down. The vacuum controls operate but don't light up as expected, and the pressure readout is not showing a reading. The console turns on and produces video output with the correct data overlay. The filament control reads "bad filament," despite the filament continuity being OK. There is an interlock between the pressure gauge and console that may be keeping the filament off. We'll need to verify the pressure gauge output and see how to trigger that interlock.

We received and installed an MKS Micropiriani 925 vacuum gauge that measures vacuum up to atmosphere. Next: Pump down the chamber and see what the pressure is, locate any leaks and address them.

See Stereoscan_Operators_Log for details.

Documentation

Manuals and Images

Pfeiffer Balzers TPU TPH 170 manual
Similar but smaller unit manual File:Pfeiffer Balzers TPH TPU 110 .pdf
Table of pumps to compatible controllers File:Pfeiffer table.pdf
View of pump 1 Media:PfeifferTHP190_1.gif
View of pump 2 (connector side) Media:PfeifferTHP190_2.gif
View of pump 3 (other side) Media:PfeifferTHP190_3.gif

Original

757 Labs

Previous owners (757 Labs, another hackerspace) attempting repairs compiled some information at:

Additional Resources

  • The original S200 operating instructions are available at the space in a three-ring binder near the machine.
  • If possible, members will also have access to a PDF copy of Scanning Electron Microscopy - A Student's Handbook, 1980, self-published by Michael Postek, et al. This book was widely used by microscopists and is still regarded as a good learning reference, but the original binding is rare and prone to falling apart. It might be possible to use the PDF copy for private, educational use.

More Photos

Contacts

We'll have a list here of HacDC members who are responsible for the SEM, including people that should be notified about problems.

Mirage335 (talk) Custom electronic control replacement circuitry.

Plasma Dan K., plasma on IRC. SEM information, documentation, repair information, problems

Pages in category "Stereoscan"

The following 3 pages are in this category, out of 3 total.