Difference: FilamentExchange (2 vs. 3)

Revision 327 Jul 2007 - Main.KdDerr

 
META TOPICPARENT name="Jeol1230Instructions"
Contents

Filament Exchange

Determining if the filament is blown

  • You had a beam, but now you do not.
    • You did not move the sample
    • or change any microscope parameters
  • The Beam Current value drops to the filament off value

Removing filament

  • Remove sample
  • Press Gun Vent button - control panel
  • Flip Gun Lift switch to on - control panel
  • Wait for gun to lift (patience)
  • Put on lint free gloves
  • Unscrew outer ring from wehnelt assembly
  • Pull out wehnelt assembly
  • Replace the outer ring into the gun
Changed:
<
<
  • Make sure the o-ring in clean and in its groove
>
>
  • Make sure the o-ring is clean and properly aligned
Added:
>
>
  • Flip Gun Lift switch to off - control panel
  • Wait for gun to lower (patience)
  • Press Gun Vent button - control panel

Cleaning Whenelt Cap

  • You will need
    • Aluminum Foil
    • Pol polish
    • Mr. Clean (ammonia free)
    • 4 - 250 mL beakers
    • Cotton tipped applicators
    • Ethanol (reagent grade and 200 proof)
  • Polish the
  • Wear lint free gloves when handling gun parts

  • If you have the luxury of time
    • Place the Whenelt cap in 100% Micro-90 overnight
    • This eliminates the Pol polish step
 

  • Set ALLOWTOPICVIEW =

-- KdDerr - 27 Jul 2007

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