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Monochromated X-Ray Source with XR5 Electron Gun
Symptom
General
Specific
Cause
Cause
Partial loss
Mono spots or a
Height of sample is
of XPS
single spot not
slightly wrong
signal
completely
coincident.
Crystal
manipulators have
been moved.
Mono gun not
A HT tick has
running at specified
corrupted the
settings.
power supply
settings.
One mono spot(s)
Twin anode not
blocked.
retracted blocking
one spot.
Anode coating degraded
Warning
Readback from
Can be caused by
messages
power supply to
a high voltage tick.
indicating a
datasystem
gun fault
indicates a fault.
appear on
the data
system
Loss of
An HT tick has effected communication.
control of
the gun from
the
datasystem.
Gun still
running
Table 4: Fault Finding
5.10
Fuses Information – for Service Engineers
Within the digital X-ray PSU, T352/NT, there is an 800mA(T) fuse on the mains input.
Issue 5
29
How to Rectify
How to Fix
Check height of sample on
Adjust height
CCD camera image
Check that the position of the
Adjust to obtain
mono spots coincident with the
coincident
CCD image using a phosphor
position.
sample.
Readback settings can be
Stop and restart
seen in "Expert Mode", this
mono gun.
should follow the set values.
Observe position of twin
Retract.
anode.
Move the anode on its z-drive
Leave at new
while running the ratemeter or
position.
observing the spot on a
phosphor sample, look for
more signal or a brighter spot.
Check to see if it is was just a HT tick by clearing
the message and checking the gun still runs
correctly.
Reboot the
datasystem. Try
the gun control
again.
Monochromator and XR5 (HA600054)
Monochromated X-Ray Source with XR5 Electron Gun
6
Index
A
Alignment of the Analysis Centre and Microscope
Cross Hairs .........................................................12
Anode ...................................................................9
Anode Cap Cleaning...........................................27
Anode Maintenance............................................21
Avantage Data System Monochromator Controls
............................................................................15
C
Cathode ................................................................9
Ceramic Replacement ........................................27
Contents ...............................................................2
Crystal Maintenance ...........................................27
D
Degassing - after a System Vent and Bake ........19
Description............................................................8
Different XR5 Operating Modes..........................16
E
Errors and Warnings...........................................16
F
Fault Finding .......................................................28
Figures..................................................................3
Fuses Information – for Service Engineers .........29
G
Getting Help..........................................................4
H
Health and Safety .................................................5
I
Index...................................................................30
Monochromator and XR5 (HA600054)
30
Introduction ...................................................... 4, 8
L
Limits of Operation............................................. 18
M
Maintenance ...................................................... 19
Monochromator Crystal Assembly ..................... 10
Monochromator Fine Tuning .............................. 12
Monochromator Operation ................................. 15
Moving the XR5 Anode ...................................... 11
O
Observing the Monochromator Spot .................. 17
R
Re-alignment after a Bake ................................. 19
Replacing Anodes.............................................. 22
Replacing Filaments/Cathodes .......................... 23
S
Safety Interlocks .................................................. 5
Safety Warnings: ESSENTIAL READING............ 5
Switching on the Re-circulated Water ................ 17
T
T352/NT Computer-Controlled Power Supply.... 14
Tables .................................................................. 3
W
Water Cooling Circuit ......................................... 10
What You Should Have Already Read ................. 4
X
XR5 Electrostatic Electron Gun............................ 9
Issue 5
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