Re[2]: Answers to Electronic Dosimetry Operability Checks

[BRZGV@ccmail.ceco.com]

     I believe I have heard it stated that the problem with the speaker 
     check is a timing problem.  The chirp of the dosimeter is initiated by 
     a stationary magnet within the reader as the dosimeter is inserted.  
     The timing of the period and possibly the duration of the period where 
     the reader listens for the beep does not always coincide with the 
     actual tone emitted by the dosimeter.  It is most likely that the 
     dosimeter may emit the tone before the reader gets the signal to 
     listen.  Rate of insertion by the user may also be a variable.
     
     I have not actually used the speaker check with our "access control" 
     software because of these problems, but most certainly would use the 
     check if we can get it to operate correctly.  
     
     This would be one of the things on the top of my wish list to add for 
     QC purposes.  It is such a shame that such a potentially useful tool 
     doesn't work properly.
     
     Sincerely
     Glen


______________________________ Reply Separator _________________________________
Subject: Re: Answers to Electronic Dosimetry Operability Checks
Author:  radsafe@romulus.ehs.uiuc.edu at INTERNET
Date:    9/24/96 9:25 AM


MG readers will check for the chirp, but the reliablity of the hardware that 
determines whether it chirped is really poor, you get about 10% false 
reportings that the dosimeter did not chirp.  This makes the checking pretty 
much useless in a production environment.  I stopped having the software 
check for chirps, because 10% of the people couldn't get in the plant.
     
     
At 07:56 AM 9/24/96 -0500, you wrote:
>About a week ago I posted a request for information about how
>operability checks for electronic dosimetry are performed.  Specifically I 
>wondered if the readers check the speaker function prior to entry.  I 
>received two responses to my question.  One was from a user who
>agreed that the speaker function should be checked.  The second was 
>from a vendor explaining that his product does not require a check 
>because of the high reliability.
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