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[tek 2246] single sweep purpose

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David Hess:

--- Quote from: TimFox on December 11, 2022, 11:51:28 pm ---The P7 phosphors have very long persistence, with a second phosphor (excited by light from the prompt first phosphor layer) persisting for roughly a minute in dark light.
--- End quote ---

The older Tektronix catalogs have details about the various phosphors, but I never found anything to explain why some P31 phosphor is bluer and some is greener.


--- Code: ---P31   Green   Relative Luminance 100%   Relative Photographic Writing Speed  50%   Decay Med-Short
P11   Blue    Relative Luminance  15%   Relative Photographic Writing Speed 100%   Decay Med-Short
P7    Blue    Relative Luminance  35%   Relative Photographic Writing Speed  75%   Decay Long
--- End code ---

P7 is fluorescent in blue and phosphorescent in yellowish-green.  P39 is a yellowish-green with a long decay for low refresh rate displays.

cdc3oo:
Big thanks to all of you for those very informative answers !!!

 :-+ :-+ :-+ :-+

jonpaul:
mémoire

1970s, 1980s, Tektronix 7000, 475B, dark room, scope hood, max intensity

Trigger DUT,  eyes  glued to the scope hood, shot, repeat.....

Many happy hours working on HV pulse transformers, arc lamp ignitors, radar pulser, transient generators.

Had tektronix  scope cameras triggered to the sweep on 7000 scopes, used Polaroids.

just the ramblings of an old retired EE

Jon

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