Stereo Scan 440 - DCU

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6-8 Chapter 6 Fault Diagnosis . 4. Unstable beam, or filament current, especially noticeable in the emission image. 5. EHT tripping out. 6. Image drifting out of focus. 7. Unacceptable change in the insb'Ument calibration. 1,2 and 3 could also be caused by:- a) a vacuum interlock problem b) the wrong (or NO) detector being selected c) the aperture changer being out of position (especially no. 1) 4 and 5 can also be caused by:- a) a cracked filament base b) an incorrectly fitted or postitioned filament in the firing unit c) dirty filament contacts either in the gun or in the EHT set. d) a dirty firing unit, especially the grid aperture e) an oldfilament j) a dirty anode g) an inadequate vacuum, especially when using high KY. 6 and 7 can also be caused by:- a) a faulty Electron Optical system Short Filament Lffe If short filament life is experienced the following factors should be checked as they will almost certainly shorten a filament's operational life. Ensure that the vacuum is good before firing up a filament. Although a filament can be fired up as soon as "Vac Ready" is achieved. the longer that it is possible to wait for the vacuum to improve, before using the filament, the better for filament life (and also signal quality!). Filament positioning in the firing unit will also affect filament life for both better or worse, and the following tips may be useful for optimising the insttument performance and fllament life:- Stereoscan 440 Operator Manual
I ... .. . Tungsten Emitter Chapter 6 Fault Diagnosis 6;9 Fitting a New Tungsten Filament When fitting a new filament to a firing unit, insert the filament as described in Section 2.2.4 Changing the Filament, ensuring the filament is visible in the centre of the firing unit aperture. Once the filament is central, using the firing unit tool supplied, screw the adjusting ring in until the filament is level with the front face of the firing unit aperture. Then bring the filament back as far as is required for your operating requirements according to the following guide:- I High ResoIutioo/ ~ SigDa! Medium Resolution! General ~lications I Low Resolutioo/ turn back from front face of ~ turn bIM:k from from face of apertmc ~.. ! c". nams back from front fIK:e of aperture Maxinwm F1\8IICIIt Life - -- Additionally, for maximum beam stability, essential for long EDX/WDX analysis, as well as setting the filament back 11'4 turns, it is recommended that the Beam Current be reduced from 4OOuA to about l00-200uA. This will increase, still further, the life span of the filament. Running Up a New Tungsten Filament When nmning up a new Filament (Tungsten or LaB6) it is good practice to select the New Filamentcheckbox on the Gun Set Up panel (Beam-> Gun Setup). This will select a nm up routine tailored to the new filament. The field will automatically be deselected when the run up completes. It is advisable to run a new Tungsten filament up carefully for the fIrst time, if possible starting at a relatively low KV (5-10 KV) and letting the filament get warmed up, before gradually increasing to any working KV significantly above 5-10 KV. t$. ~ That it may be noticed the filament position may drift having been heated, and might need to be re-centred after being heated up for the first time. LaB6 Emitter The most important things to ensure long filament life with an LaB6 emitter are basically the same as for Tungsten, but to remember that LaB6 requires far more care and attention. Stereoscan 440 Operator Manual
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All reasonable steps have been take
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Instrument Photographic Choice of I
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iv Contents Chapter 5 - Maintenance
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The specimen chamber of the Slereos
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The User Interface Overview The use
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5. Panel Selection There is one oth
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B If B is pressed. the arrow keys m
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The top window, see Figure 1.3, pro
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Individual items can be selected or
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1~1~ Chapter 1 Getting Started i '
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all the operating conditions of the
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1-20 ~bapter 1 ~g S~ move the mouse
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FIgUre 1.10 Image of First Peak Set
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Chapter 2 This chapter contains the
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Chapter 1. Operation 2--3 " -- Scan
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Chapter 2. Operation 2.,.,5 ,- . ..
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, , Chapter 1. ~ - 2-- 7 ""a-uu"" 1
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1. Admit air to the gun. Open the g
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Automatic Stage lnitialise The stag
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For LaB,:- 1 Press the Emission but
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~I.~ Chapter 2 Operation -'--"=-,'Z
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2-18 Chapter 1. Operation - - - - a
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2-20 Chapter 2. Operation. 1 2 t Se
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2-22 Chapter 1. Operation If the wo
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2-24 Chapter 2 Operation The Zone T
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Quad Mode Quad mode is selected fro
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2-28 Chapter 2 Operation . - -, , "
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On the histogram display there is a
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Panels A panel is a special kind of
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current text string). In addition t
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Micron Markers Two types of micron
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Graticule and Crosshairs Graticule
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HRRU Camera This sets the type of c
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2..42 Cbapter 1. Operation ~ I It h
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current when the image was saved. T
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2-46 Chapter 2 Operation The Clipbo
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Having now become familiar with the
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high a probe current, thus the acce
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, Chapter 3 Advanced Operation 3-5
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3. The retractable backscattered el
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I~.." - Chapter 3 Advanced Operatio
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"".~-I Chapter 3 Advanced Operation
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" Chapter 3 Advanced Operation 3-13
Page 88 and 89: Non-Volatile, Non-Conductors If it
Page 90 and 91: The solvent is then allowed to evap
Page 92 and 93: Chapter 3 Advanced ~OD 3-19 -c - -
Page 94 and 95: Other Menu Features The display of
Page 96 and 97: Points and Steps In addition to the
Page 98 and 99: Confirm This instruction check that
Page 100 and 101: ._~ Chapter c" ~ 3 Advanced Operati
Page 102 and 103: Remove Removing a macro from a libr
Page 104 and 105: The position in the list can be con
Page 106 and 107: Install The install option copies t
Page 108 and 109: Chapter 3 AdvancedOperati on 3-35 3
Page 110 and 111: I I PARAMETER I En"ECT OPTIMUM COMM
Page 112 and 113: 4.5. Good Housekeeping, i.e. keepin
Page 114 and 115: Chapter -. 4 System Management - +3
Page 116 and 117: 4.1.5. Directory Contents I \nGA i
Page 118 and 119: 4.3. The User Directory Concept A u
Page 120 and 121: I this be reql!i~. File Types, e.g.
Page 122 and 123: 6-12 Chapter 6 Fault Diagnosis The
Page 124 and 125: 5-2 Chapter 5 Maintenance 5.1.2. Ai
Page 126 and 127: STEEL AND ST ~S STEEL, COPPER AND m
Page 128 and 129: 5-6 Chapter 5 Maintenance Cleaning
Page 130 and 131: Cleaning the Aperture Assembly Vent
Page 132 and 133: PC Related Faults PC related proble
Page 134 and 135: 6-4 Chapter 6 Fault Diagnosis , .".
Page 136 and 137: 6-6 Chapter 6 Fault Diagnosis The I
Page 140 and 141: 6-10 Chapter 6 Fault Diagnosis! "I
Page 142: This file contains the configuratio
Page 145 and 146: Please report the problem. F All..E
Page 147 and 148: Stereoscan 440 Operator Manual NVRA
Page 149 and 150: 6-20 Chapter 6 Fault Diagnosis 4 WW
Page 151 and 152: Code numbers greater than 40 indica
Page 153 and 154: WINDOWSTM APPUCA nON ERROR When a W
Page 155 and 156: Introduction As new Window~ applica
Page 157 and 158: Appendix ~ The Stereoscan 440 PC! A
Page 159 and 160: " c., Appeudb C Expansion via the P
Page 161 and 162: Appendix D Reporting software probl
Page 163 and 164: Service Manager - SEM Harry M azal
Page 165 and 166: B-2 Appendix E Options- . Operation
Page 167 and 168: Controls Angular Measurement The an
Page 169 and 170: Angular Measurement Each measuremen
Page 171 and 172: The position of the box can be adju
Page 173 and 174: I Set the magnification to the requ
Page 175 and 176: Positioning the Poin~ In Move mode
Page 177 and 178: &14 Appendix E Options I II Image D
Page 179 and 180: ~ AMaxB This function freezes the i
Page 181 and 182: Histogram Equalisation The histogra
Page 183 and 184: Overview The input LUT is used to p
Page 185 and 186: E-22 Appendix E Options Sawtooth Th
Page 187 and 188: A group box at the top left of the
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" The communication port used by th
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Selection I The signal mixing panel
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E- 30 Appendix E Options Select one
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E-32 Appendix E Qptions . . High Us
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. The stage Move window comprises a
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Keyboard Control The cursor (arrow)
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E-38 Ap~ ~ Options In addition Macr
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Grainl Grain2 actionedl I To indica
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The function is provided as part of
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Operation Selection Operation of th
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Stage Scan Invalid This indicates i
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E-48 Appendix E Options ~-",,-;,,~_
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Freeze This function will freeze th
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1.21 Trackerbal/ Introduction This
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Controls Display the pop up control
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Operation Configuration XRay Interf
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E-58 Appendix E Options 11_- X Ray
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Intensity Dot Map Set Up In dot map
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The Linescan data is displayed in a
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E-64 AppeDdjx E ~oos ... ~~ full sc
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Annotation A set of annotation labe
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2. 2.1 Stage Motorisation The stage
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Camera Image Select between Live, S
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If the box marked Fast is selected,
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Remove the Camera assembly from the
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~--~- ~- , -~~::~ '#:r: .TungsIen F
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.,, , or_~ :---1 ' ' --~... 'FG'-~-
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Figures 9,10,11,12 Emission Images
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Assembly Assembly . of the STEM det
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4. Select SCM Image from the Specim
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~ ~ ~ ~ E I I I I I I Stereoscan 44
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DOS, 4-1 Dose rate, 3-12 Dual magni
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1-4 Index Rotary pump Oil. 5-2 Oil
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Appendices s+Shift ff ~ I ARRO~ ~ys
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