Venting The Alpha Chamber(S); Manual; Automatic; Inserting A Sample Into The Vacuum Chamber - Ametek ORTEC Alpha Duo Hardware User's Manual

ALPHA DUO, ALPHA MEGA, & ALPHA ENSEMBLE USER'S GUIDE
3.2

VENTING THE ALPHA CHAMBER(S)

3.2.1

Manual

MAESTRO – Turn off the detector bias/pulser. Go to the Alpha tab of the MCB Properties dialog,
•
click on the Vacuum state drop list, and select VENT. Use the Actual vacuum readout to
monitor chamber pressure.
AlphaVision – Turn off the detector bias/pulser. On the Detector Grid, click on the desired alpha
•
chamber, then click on the Hardware icon on the outlook sidebar. On the Pump drop list, select
VENT.
3.2.2

Automatic

MAESTRO – Turn off the detector bias/pulser. On the Alpha tab, unmark the Vacuum
•
monitoring, checkbox, then click on the Vacuum state drop list and select VENT.
AlphaVision – Turn off the detector bias/pulser. On the Detector Grid, click on the desired alpha
•
chamber, then click on the Hardware icon on the outlook sidebar. On the Pump drop list, select
VENT.
3.3

INSERTING A SAMPLE INTO THE VACUUM CHAMBER

1) Once the desired vacuum chamber(s) has been vented, open the door. Figure 1 and Figure 2
respectively show open Duo and Mega chamber with a detector, sample holder, and the series
of slots that allow users to adjust the sample-to-detector distance in 4 mm increments.
2) Slide the sample holder into the slot at the desired height. For optimum resolution, the sample-
to-detector spacing should be at least equal to the detector diameter. The maximum spacing is
44 mm. The sample trays shipped with the Alpha Duo are for 0.75 in. (19 mm) and 1 in. (25 mm)
samples. The trays for the Alpha Mega can accommodate samples up to 4.2 in. (106 mm),
which can optionally be secured to the tray with the included removable clips.
3) Close the door and use MAESTRO or AlphaVision to begin pumping. After a minute or two,
when the vacuum has reached a satisfactory value, it is ready to start data collection.
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