On 1/24/2012 12:38 PM, Dennis Tillman wrote:
During the discussion of the 576 vs 577 curve tracer I mentioned the 577
graticule was not illuminated which I find annoying every time I want to
take a picture of device characteristics on the CRT.
Later I realized I might be able to take advantage of the storage CRT
flood gun on my 577 D1 to light the screen from inside the CRT. It is
not the solution I was looking for but it does work (with drawbacks).
A more intriguing solution came from Ed Breya, with an explanation of
how it works from David. If you ???flash??? the phosphor it will glow and
illuminate the graticule from inside the CRT. I tried this with two
different LEDs I had handy and the results were quite promising.
<snip>
Hello, Dennis--
Have you tried using ultraviolet-emitting LEDs? IIRC,
one of the --HP-- oscilloscope cameras used a UV emitting
lamp to light up the screen's phosphor and show the graticule.
73--
Brad AA1IP
