[Amps] SB-200 and SB-220 meters

[David G4FTC]

> Date: Tue, 6 Nov 2007 13:27:12 -0800> From: bswadener at yahoo.com> To: amps at contesting.com> Subject: Re: [Amps] SB-200 and SB-220 meters> > > Scott McGrath wrote:> > > > Simple technique> > > > 1 - remove the old meter scale from meter> > > > 2 - scan into your favorite image editor (photoshop> > et al)> > > > 3 - make appropriate color corrections (Auto> > Contrast, Auto Levels in > > photoshop may also need 'Dust and Scratches' filter)> > > > 4 - create a TIFF file of meter scale making sure> > drawing is at 1:1 ration> > > > 5 - Bring to local drafting supply outlet and have> > them print it on > > opaque film this is white and about .050 thick> > you can also do this if you have a commercial> > grade printer. i.e, > > DesignJet. Epson 2200 etc> > > > 6 - Carefully with a X-acto knife cut out meter face> > and drill screw > > holes using old face as a guide> > > > 7 - Install on meter movement you now have a shiny> > new translucent meter > > scale which is fade resistant> > > > ------------------------------> > David G4FTC wrote:> > > > I haven't tried this but the following may work.> > > > Firstly you need to buy some polyester (mylar)> > drafting film which can be used in a laser printer.> > This is sold not only for drafting but also for> > producing films for making PCBs with a UV light box.> > The polyester film is semi transparent and when> > printed the blacks are totally opaque.> > > > Then simply scan the original meter face, touch up> > using photoshop, and print onto the polyester film.> > > > The only problem is that the film is fairly thin -> > but I think it may be rigid enough for the job.> > > > Regards> > > > David G4FTC> > You may want to add registration/crop marks to your> graphic image, making it easier to see where to trim> the new meter face. Also, as long as you're printing> one meter face, you might was well fill the page,> which gives you more than one chance to obtain a good> finished product.> > I suggest that after printing & trimming the new meter> face, you seal the toner with a clear-coating. As with> dry-transfer lettering, the first one or two coats> should be very light, to prevent the toner from> lifting. I prefer a matte finish, to minimize glare.> 
 
I have only used the polyester film for PCB layouts - from my experience the toner fuses into the polyester very effectively. I think the chance of the toner lifting is very low.
 
BTW the trade name in the UK for the film sold for PCB layouts is "LaserStar" - it is 75 micron. 
 
73s
 
David
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