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5 First Operating Steps | 5.7 Working with Specific Specimen Types
ZEISS
Recommended
Parameters
The following parameters are recommended for hydrated specimens. The values given are only
suggestions and the operator may find that different values will give better information for the
types of specimens that are being investigated.
Parameter
EP mode for cooled hy-
drated specimens
EP mode for hydrated
specimens
20 kV
20 kV
I Probe
300 pA
300 pA
8.5 mm
5 mm
Filament
Fil I
set to second peak
Fil I
set to second peak
Mid-column aperture
750 μm
750 μm
Pressure-limiting aperture
100 μm EP aperture
100 μm EP aperture
Beamsleeve aperture
500 μm
500 μm
Detector
Scanning parameters
Cycle time ≥ 20 s
Cycle time ≥ 20 s
Chamber pressure
650 Pa to slow dehydration
2500 Pa to 3000 Pa to retain
water at ambient tempera-
ture (20 °C to 30 °C)
Temperature
Temperature of the speci-
men to retain water at
650 Pa = 1 °C (controlled by
the Peltier coolstage)
–
5.7.3.1 Installing or Deinstalling the EP and Beemsleeve Apertures
To use the optional EP mode, you need to install the EP and beamsleeve pressure-limiting aper-
tures under the objective lens.
Additionally, you need to select the 750 μm mid-column aperture and adjust some settings in
SmartSEM.
Pressure-limiting aperture
mid-column aperture
None (HV mode)
20 μm or 30 μm
100 μm EP aperture
and 500 μm or 1000 μm beamsleeve aper-
ture
750 μm
Parts and Tools
100 μm EP aperture (upper aperture assembly, 354720-9309-000)
Beamsleave aperture 500 μm (lower aperture assembly, 354720-0266-000), recommended
Beamsleave aperture 1000 μm (lower aperture assembly, 354720-0267-000), alternatively
Aperture removal tool (350700-0692-000)
Upper aperture tool (354720-9310-009)
Lower aperture tool (354720-9297-009)
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Instruction Manual ZEISS EVO | en-US | Rev. 10 | 354706-0780-006
Содержание EVO
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