Zeiss SIGMA Series, Инструкция по эксплуатации

Страница: 133 / 170

ZEISS 7 Troubleshooting | ​
7 Troubleshooting
The following table provides hints for solving common problems. If you cannot solve the problem
or if you are unsure about a certain technical difficulty, contact your local ZEISS service represen-
tative.
Symptom Cause Measure
Drift: Specimen seems to
be moving
§
Charging effects
§
Nonconductive specimen
§
Ensure proper conduction
of the specimen
§
Optimize specimen prepa-
ration
§ Apply a charge compensa-
tion method
Stub not correctly fixed by
screw. Fix the stub correctly.
Gun is switched off auto-
matically Gun has been switched off for
safety reasons since gun vac-
uum is worse than
2 × 10⁻⁸ mbar Refer to Baking out the Gun
Head [
}
138]
Image is bad at low EHT
(e.g. 1 kV) Working distance is too long Reduce the working distance
to a maximum of 7 mm
Image is noisy. Noise re-
duction methods do not
help Field emission gun is used up Contact your local ZEISS ser-
vice representative to have the
field emission gun replaced
Image quality degrades,
but there is no change in
total emission current Field emission gun has been
damaged due to arcing Contact your local ZEISS ser-
vice representative to have the
field emission gun replaced
InLens image is noisy Working distance is too long Reduce the working distance
to a maximum of 7 mm
No InLens image EHT exceeds 20 kV Reduce the EHT to a maximum
of 20 kV
Microscope is dead Circuit breaker is tripped
(lower position) Check the circuit breakers
Refer to Checking the Position
of the Circuit Breakers [
}
140]
Stored position of the
specimen stage cannot be
approached correctly PC has crashed Restart the PC
Stage needs to be driven to a
well-defined position Refer to Initializing the Stage
[
}
134]
After a power failure, the
stored stage position can-
not be approached cor-
rectly Stage needs to be initialized Refer to Initializing the Stage
[
}
134]
SE image is noisy Scintillator is used up Contact your local ZEISS ser-
vice representative to have the
scintillator replaced
Specimen current is low Field emission gun is used up Contact your local ZEISS ser-
vice representative to have the
field emission gun replaced
Instruction Manual ZEISS SIGMA series | en-US | Rev. 7 | 352102-9344-006 133