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IDD
TOUCH-UP
PAINT
PART
NUMBERS:
OLD/NEW
COLORS
(CONT.)
4006
401X
402X
405X
4081
4601
461X
4623
463X
464X
466X
4905
4907
4923
4924
4952
4953
4954
4956
Tek
New
Gray/Tan
IDD
Products
Slate
Gray
spray paint p.n.
252-0728-00
Smoke
Tan
spray paint p.n.
252-0727-00
ADSOl
4925
41XX
4926
4691
4932
4695
4970
w2
Issue
13-20
Jl6
OPERATING
HINTS
REF:
Jl6
Manual
070-1879-00
The
following
article
provides
some
helpful hints for
use
of the Jl6.
This
infomation
can
help the
technician achieve
more
accurate
and
repeatable results
when
adjusting the
color temperature
on
color picture
monitors.
J16
Photolleter
Operating
Reca.endations
Many
engineering
and
manufacturing
areas are using
Tek
Jl6
photometers
for
measuring
CRT
luminance
and
setting color balance of white
fields.
I
have
observed several
problems
which
seem
to
reoccur.
The
following are
some
reconnendations regarding the
correct or
at
least
improved
techniques for
making
these
measurements:
-2-
October,
1883
laeue
31
1)
Zerofng--This fs
undoubtedly
the
greatest single
cause
of errors with
the Jl6
and
can
occur with
any
of the
probes.
Due
to variations in silicon
input bias current, the zero should
always
be
rechecked
when
changing
probes
and
when
the photo-diode
temperature changes.
This
fs
most
noticeable
on
r.t.
powered
Jl6
1
s
where
the photo-diode
is
positioned directly
over the r.t,
power
supply
when
plugged
into the top of the
Jl6.
Also
when
using the r.t,
power
supply, continuous
operation or
at
least
1/2 to 1
hour
wamup
is
best to
minimize
zero
drift
on
the
most
sensitive ranges.
The
Jl6
uses
a
mono-polar
DVM
circuit
which
will
still
read
000
even
when
the zero
is
offset in a negative
direction.
This
has
the appearance of
non-linearity especially
at
low
light
levels.
Also
the
same
reading will
not
be
obtained
when
changing
to the
next range.
To
let
the operator
know
that
it
fs incorrectly zeroed, the
minus
sign fs
wired
to indicate that
the zero fs
offset
in a negative
direction.
To
correctly zero the
Jl6,
cover the sensor
and
adjust the zero
adjustment
on
the
O.lX
range
until the
minus
sign
just
flickers
on
and
off.
An
alternate aethod fs to adjust the
zero until a reading of typically 5
fn
the
last
place dfgft fs obtained.
This
reading fs
checked
often
when
using the
most
sensitive ranges.
If
the Jl6 zeros correctly
on
the
XO.l
range
but fs incorrect
on
the
XlOOO
range,
ft
fs
an
fndfcatfon
that
the
internal
DVM
zero
needs
readjustment
according to the procedure
fn
the
manual.
The
zero procedure fs
more
complex
when
using the
J6523
1
luminance
probe--enough
so
that
I
reconnend
use
of the
Minolta
1 spot meter,
ff
possible, rather than the Jl6/J6523.
The
Minolta
has
auto ranging.
no
zeroing required,
compact
size
and
a
display that fs visible
through
the
eyepiece
used
for sighting.
The
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