Fluke 341A - Page 30

4-1
S.
CLEANING
4-16. The instrument should be cleaned
periodically
to
remove dust, grease, and
other contamination. Since
the
instrument is completely enclosed,
having
no
fans, the need
for
cleaning
is
reduced. Care has been taken to
prevent
leakage, through the use of
high quality insulating materials
in all switches and through
special attention to component
layout. In addition, all
circuit
boards
are coated with a
moisture
sealant.
4-17.
To
clean the instrument,
proceed
as
follows:
CAUTION!
Avoid
touching the
polyethelene
grommets;
contamination
can
cause
excessive
electrical
leakage.
a.
Remove loose
contamination from the
instrument
with low-pressure, clean, dry
air. Pay particular
attention
to the front
panel binding posts, binding
post
wiring,
switches, and
polyethelene grommets.
b.
Clean
the polyethelene binding posts and
the front
panel
with anhydrous ethyl
alcohol or an aerosol can
of
Freon TF
Degreaser (Miller-Stephenson
Chemical
Co..
Inc.).
When
necessary, clean
the exposed dielec-
tric surfaces
of
switches
with anhydrous alcohol,
using
a small,
stiff-bristled brush which
has been
wrapped with a
clean doth to prevent
saturating
the
switch
contacts. After
cleaning, recoat the ex-
posed dielectric surfaces with silicon
fluid. This will
prevent leakage along
these surfaces
due
to
moisture.
CAUTION!
Be? not use
Metriclene,
acetone, lacquer thin-
ner, Freon
TF
Degreaser,
or any
ketone on the
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