Tektronix T922 - Page 217

TEKTRONIX®
committed to
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excellence
CHANGE :
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DESCRIPTION
Affects Manuals : 070-1981-01
070-1982-01
070-1983-01
070-2492-00
MANUALCHANGE INFORMATION
PRODUCT
ALL
T900 SERIES
EFFALL SN
CHANGE
REFERENCE
M3288
DATE
12-21-77
Oscilloscope Light Filter and Graticule
IlluminationPhotography Effects
Some oscilloscopescontain a factory
installed colored (usually blue or
green)
plastic light filter in front of the
crt faceplate to improvegeneral
purpose
viewing contrast in ambientlighting
conditions (in some applications
this
device also functions as an implosion
safety shield) .
In
order for the oscilloscope
graticule to be photographed along
with a crt
display,
oscilloscopes that do not provide
internal graticule (scale)
illumina-
tion must
be usedwith a camera such as
the C5A or C5AOption 3, which
provide
external flash
illumination of the graticule
. An exception to this is
some
storage
oscilloscopes operated in the
storemode, where the target
illumination
may also
illuminate the graticule
lines .
Effectiveness of the graticule
illumination flash is
severlydegraded when used
with most colored crt light filters
.
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If a clearlight
filter was provided as an
accessory
with your oscilloscope, the
colored filtershould be
removed and the
clearfilter
installed in its place
whentakingoscilloscope
display photographs .
The clear filter
may also provide improved
photographdefinition and
contrast
with reduced oscilloscope
display intensitysettings
(some colored filters
reduce
effective display
intensity as much as 75%) .
Underno circumstances
should the
oscilloscope be operated
withouteithera clear
or colored light filter
when no
other implosion
shield is provided (optional
accessory mesh filters
are not
intended for
implosion protection andmust
be removed when
usingan oscilloscope
If your oscilloscope
was not providedwith
a clearlight filter
accessory,
contact your local
Tektronix FieldOffice for
ordering information
.
For all T900-series,
bench-version
oscilloscopes, the instrument
cabinet must
be removed in order
to replace the crt
light filter . Only
qualified service
personnel should remove
the instrument
cabinet . Cabinet
removal instructions
are provided in
the Serviceportion of
T900-seriesmanuals
. The part number
for
the clearlight filter to
fit T900-series,
bench-version
oscilloscopes is
337-2185-03 .
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