25-110 Analyzer Filament

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This is an old tech tip that I wrote back in 2002. The 25-110 analyzer was the first CMA that Physical Electronics used a Lab6 filament in. These days there are not a lot of 590 systems still in operation, but the ones that are still work well especially as depth profile instruments. RBD provides Lab6 filaments and repair services for the venerable 590 scanning auger systems and the 25-110 analyzer.

General tips:

Use gloves.

Clean and demagnetize all of your tools.

Place all removed parts on a clean work area covered with aluminum foil.

If possible, dust off all parts with nitrogen as you re-assemble them.

Never force any part that doesn’t want to go.

Use methanol as a lubricant if screws don’t move easily.

 

To replace the filament in the 25-110 analyzer:

  1. Remove the magnetic shield (4 screws).
  2. Carefully remove the conical ceramic ring (4 flat-head screws) and remove the conical ceramic.
  3. Remove the outer cylinder (1 screw), being careful not to force it. If necessary, use a heat gun to loosen it up.
  4. Separate all of the wires in the bottom of the analyzer using 2 needle-nose pliers or tweezers. Be careful not to stress the wires.
  5. Position the wires so that you can easily remember where they belong. In the case of the F1 and F2 wires, this is easy. For the DELF/STIG wires, position the wires as upper right and upper left, lower right and lower left.
  6. Loosen the 4 spline set screws on the top of the inner cylinder by 1 turn CCW.
  7. Remove all but one of the 8 screws around the middle of the inner cylinder.
  8. Remove the upper inner cylinder grid cap (4 set screws).
  9. Holding on to the nose of the electron gun, remove the final screw at the middle of the inner cylinder.
  10. Carefully pull the electron gun up and out of the inner cylinder. Be careful not to stress any of the wire connectors.
  11. Place the electron gun on a sheet of aluminum foil.
  12. Loosen the bottom cap of the electron gun (4 screws and 4 set screws).
  13. Carefully slide the bottom cap down the ceramics for about 2 inches, enough room to get at the filament.
  14. Remove the filament assembly (4 cap screws, 2 splines connecting the filament wires).
  15. Install the new filament assembly and reverse all of the above steps.
  16. When you slide the electron gun ceramic tubes back down inside the analyzer be careful not to crimp the copper foil on the ceramics.  Also make sure that you tighten the set screws to hold the copper foil in place. If the copper foils slides up the ceramic it may cause arcing in the electron gun.

 

 

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20-622 Steering Voltage Adjustment Procedure

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Overview:

The condenser and objective steering voltages in the 20-622 electron gun control used on the PHI 660 scanning auger systems  need to be adjusted periodically (check it as part of   preventive maintenance service) for optimal image stability.

If your image is stigmatic and moves a lot when you change your objective lens, you may want to check the condenser and objective steering voltages. A small amount of image movement is normal.

Following this procedure will ensure that the steering voltages are operating properly and also that they are properly balanced.

Summary Table:

J3 Pin Description Offset Pot Gain Pot Deflection Bd. Pin Lens Bd. Pin

A

 COND X

R 27

R 25

 Defl 1 pin 8 58
C COND X R 27 R 25 Defl 1 pin 10 58
B COND Y

R 23

R 22

 Defl 1 pin 62 50
D COND Y R 23 R 22 Defl 1 pin 64 50
E OBJ X

R 36

R 35

 Defl II pin 7 66
G OBJ X R36 R 35 Defl II pin 9 66
F OBJ Y

R 34

R 33

 Defl II pin 61 56
H OBJ Y R 34 R 33 Defl II pin 63 56

 

    Procedure:

  1. Turn OFF the 20-610 30kV High Voltage Supply.
  2. Remove the 20-622 from the electronic console and extend the Lens control card (second board from the top). Support the board so that it is level with a non-conductive object. Remove all cables going to the 20-622 except for the power and the 40 pin ribbon cable between the PC147.
  3. Connect a DVM between pins A and C on the J3 COND & OBJ Steering connector on the back of the 20-622.
  4. Turn on the 20-622 and in AugerMap set the Beam voltage to 10kV and also set the COND X steering to 50% (mid-range).
  5. Adjust R 27 on the lens control board for zero volts on the DVM.
  6. Set the COND X steering to 100% and adjust R 25 for 205.0 volts DC.
  7. Connect the DVM between pins B & D on J3.
  8. Set the COND Y steering to 50% and adjust R 23 for zero volts.
  9. Set the COND Y steering to 100% and adjust R 22 for 205.0 volts DC.
  10. Connect the DVM between pins E & G on J3.
  11. Set the OBJ X steering to 50% and adjust R 36 for zero volts.
  12. Set the OBJ X steering to 100% and adjust R 35 for 205.0 volts DC.
  13. Connect the DVM between pins F and H on J3.
  14. Set the OBJ Y steering to 50% and adjust R 34 for zero volts.
  15. Set the OBJ Y steering to 100% and adjust R33 for 205.0 volts DC.
  16. Set the COND X, COND Y, OBJ X and OBJ Y steering to 50%.
  17. Set the Beam Voltage to 3kV.
  18. Check each pin again with respect to the chassis. They should all be zero volts with-in 50 mV DC and be stable. If they are not stable, the 7541 Dacs or 208H opamps on the error control board are usually the problem.

Calibration Complete.

Cond and Obj Steering

20-622 COND and OBJ Steering connector

 

9103 Picoammeter Actuel Update: Micro Window Display

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UPDATE: A new Actuel Beta featuring the micro window display is now available.

The Problem: Using Actuel to control and measure current with the 9103 Picoammeter takes up valuable screen real estate:

Actuel is RBD’s Windows application for controlling the 9103 USB Picoammeter. It also provides features like measuring, recording, and graphing current. Although the data recording and graphing display is a separate, optional window, the controller  and measurement window still take up quite a bit of screen real estate.  Sometimes, you just want to display the current unobtrusively while performing other work on your PC.

The Solution: A “Micro” version of the Actuel window that displays only the current and stability.

In response to customer requests, we’ve added a miniature display option to Actuel. By selecting an option in the main window, you can instruct Actuel to display a smaller window when minimized. This windows is much smaller than the main form, yet large enough to be viewed at some distance – a handy feature in many lab environments.

This “micro” window can be moved anywhere on screen and is always displayed on top of other windows. This allows you to use other applications (like RBD’s AugerScan) while simultaneously monitoring current without taking up precious screen real estate. The micro current display window provides a subset of the information available from the 9103 Picoammeter, including the current measurement and polarity, the sampling status, and the range status. There is also an warning overlaid upon the current measurement should the sample be unstable.

If you are using more than one 9103 Picoammeter and running multiple instances of Actuel, you can display a separate window for each 9103. The “micro” window displays the firmware identifier for each individual 9103 picoammeter so you can keep track of which 9103 Picoammeter each display is associated with.

This feature is just one of many additional features coming to Actuel, which will include a data display cursor, and auto-save-to-file while sampling. As always, Actuel is free for all owners of a 9103 Picoammeter! Meanwhile, you can download the most recent version of Actuel here:

Download Actuel for the 9103 USB Picoammeter

More Information on the 9103 USB Picoammeter