[ RadSafe ] Victoreen 450

[Chris Alston]

Folks

Those batteries are the power source for the meter's electronics (unless I
misremember badly).  I think that there is an additional space in the
handle for the batteries for the little lamp.  The chamber bias voltage
batteries (5 x 10 V, probably silver oxide) are soldered to a board inside
the meter, so you would have to open the case, by removing the screws, to
get a look at them.

Fluke does not release most of the schematics for its instruments.  Their
reasoning is that it discourages people from trying to obtain service other
than by the factory.  I guess that they have seen some pretty ugly
soldering, etc., over the years, or had instruments returned to them
malfunctioning because someone had misunderstood a schematic.  Whatever one
might think about that policy, while they are supporting an instrument,
once they d/c support, by obsoleting an instrument, it makes maintenance
very hard for owners.  By contrast, Ludlum does not have either of these
policies (lack of support for alternate service centers and obsoleting
instruments).  You might try calling the Global Calibration Lab, and asking
them for schematics; all they can say is "sorry, but we cannot do it".  Jim
Sipos is a great guy in tech support there.

It is really too bad about the end of the Model 450.  It was the best
ion-chambered instrument i ever used for beta dose rates, and low-E photon
exposure rates, especially in relatively confined areas (e.g., laboratory
benchs).

Cheers
cja

---------- Forwarded message ----------
From: Peter Fear <fearp at upstate.edu>
Date: Thu, Jul 5, 2012 at 8:30 AM
Subject: Re: [ RadSafe ] Victoreen 450
To: radsafe at health.phys.iit.edu


In ours there are 2 9 volt batteries in the handle. The ends are held in
place by metal pins. Lift them out using a small screwdriver, replace
the battery, hold the end in place and then replace the pin. There is on
on each end.


Pete

Peter Fear
Health Physics Technologist
SUNY Upstate Medical University
Radiation Safety Office
636 UH
750 E. Adams St.
Syracuse, NY 13210

Phone: (315)464-6510
FAX:     (315)464-5095
fearp at upstate.edu


>>> Pedro Argolo Piedade  07/04/12 11:02 AM >>>
Anyone happen to have a diagram of where the HV batteries hook up on a
Victoreen 450 or a photo of same. The battery holder is missing.

I need to fix the Victoreen 450!

Dusting off the shelves and found the Victoreen 450 I bought a while
back.
I'm looking for a schematic to troubleshoot the thing. Can anyone help?

Thanks
--
Pedro Argôlo Piedade
Físico Médico
+55-048-91672105
pedroargolopie at gmail.com
skype: pedroargolopie
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