Date: Thu, 22 Feb 1996 11:39:04 -0600
Subject: reading absorbed current on the SX
From: johnf@geology.wisc.edu

X-Listprocessor-Version: 6.0b -- ListProcessor by Anastasios Kotsikonas

Status: OR



I would like to read the absorbed current off of specimens (we're working

with some specimens with anomalous BSE response). Unfortunately

the readout on the Sony monitor gives only one decimal place (and I

have no idea whether it is rounded up or truncated). I'd like at least 2

decimal places if not more. Talking with Cameca, I find that I could pick

a small voltage off of test point 4 on the absorbed current board that is

on the back of the stage (but then I would have to calibrate it).



The Cameca SX50/Sun Reference Guide (1991), in 2 places (page 3-4 and 3-6)

refers to an SEM variable CURR which it says is "absorbed current".

Either absorbed current is french for faraday current, or some one changed

the variables meaning without revising the manual. Type "show curr" in the

local window and you get the last faraday measurement to five decimal places.



Does anyone out there know any 'work around' method to get an output in

the local window of a more precise reading of absorbed current?



John





John Fournelle

Electron Microprobe Lab Internet:johnf@geology.wisc.edu

Dept of Geology & Geophysics Office: (608) 262-7964

University of Wisconsin Lab: (608) 265-4798

1215 West Dayton Street Fax: (608) 262-0693

Madison, WI 53706 Amateur radio: WA3BTA/9

http://geology.wisc.edu/~johnf/sx51.html



"The first rule of all intelligent tinkering is to save all the pieces."

Aldo Leopold