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*

Alfred,
 
    I have measured the deadtimes on my 8600 a few times (when I think I detect a slight change).  Here's what I now have on my system but I have not changed these in at least a year or so.
 
Spec 1 - 1.17 u-seconds
Spec 2 - 1.47 u-seconds
Spec 1 - 1.35 u-seconds
Spec 1 - 1.55 u-seconds
Spec 1 - 1.27 u-seconds
 
 
    How accurate are they?  Hey, I have them out to the 2nd decimal point for a reason!  BTW - Cameca locks in their deadtimes to 3 u-seconds and that really restricts the count rate they can use without problems.  If ya need a description of my simplistic technique for determining these numbers, let me know.
 
Paul

Paul F. Hlava
Electron Microprobe Laboratories
Department 01822 - Materials Characterization
505-844-1890
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From: JEOL Probe Users List [mailto:[log in to unmask]] On Behalf Of Alfred Kracher
Sent: Thursday, October 20, 2005 11:33 AM
To: [log in to unmask]
Subject: [PROBE-USERS] detector deadtime

JEOL Probe Users Listserver

Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab, University of Minnesota

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* Hello,

I am curious how many JEOL 8x00 users have actually measured the deadtime of their detectors? And if so, what were the results? Has anyone figured out how precise such a measurement could be?

Alfred

Alfred Kracher
Ames Laboratory (USDOE)
Iowa State University
227 Wilhelm Hall
Ames, IA 50011-3020
Tel.: 515 294 7097