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BRUEL & KJAER System V - 4805 Body; Insert Installation and Replacement; Fixtures

BRUEL & KJAER System V
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3.3.2.
4805
Body
Place
the
Exciter
Head
on
top
of
the
Exciter
Body
with
the
connector
to
the
rear
(the cool-
ing
air
hol e is also
to
the
rear).
The
lower
edge
of
the
Head
Protective
Can
will
slip
over
the
Upper
Wheel
of
the
Exciter
Body
and
the
Head
Alignment
Pins
will
rest
on
the
upper
surface
of
the
Upper
Wheel.
Rotate
the
head
until
the
Head
Alignment
Pins
drop
into
the
holes
in
the
Upper
Wheel
and
lower
the
Head
until
it
is
fully
engaged
.
The
Split
Hub
of
the
Head
will
prov
ide close
concentricity
guidance.
The
magnetic
field
should
be
suffi-
cient
to
hold
the
Head
in
place,
but
3 x 4
mm
screws
are also
provided,
which
can be
screwed
into
the
space
normally
used
for
the
Head
Latches
.
Attach
the
cable
from
the
Power
Amplifier
to
the
connector
on
the
Head.
The
Exciter
is
now
ready
for
operation.
To
remove
an
Exciter
Head,
remove
the
hold-down
screws
from
the
Head
Latch
slots
.
Place
your
feet
against
the
base
on
either
side,
take
hold
of
the
Head
and
jerk
it
upwards
a
few
centimeters.
This
will
pull
the
Driver
Coil
free
of
the
magnetic
field,
after
which
the
Head can be
lifted
off
easily
and
smoothly.
3.4.
INSERT
INSTALLATION
AND
REPLACEMENT
Exciter
Heads
which
use
inserts
are
supplied
with
a
mounting
tool,
a
bott
le
of
thread
locking
cement,
and
two
boxes
of
inserts.
One
box
contains
inserts
with
metric
internai
threads
and
the
other
contains
inserts
with
imperial
internai
threads.
To
install
an
inser!,
the
insert
is placed on
the
tool,
with
the
pin
of
the
tool
inside
the
in-
sert
internai
thread
and
with
the
blade
of
the
tool
in
the
slot
of
the
insert.
Both
the
insert
and
the
hole
should
be
thoroughly
cleaned
with
a
solvent
to
remove
all
traces
of
oil
or
contaminants
from
fingerprints.
A
drop
of
cement
is placed on
the
insert·
externai
threads,
and
the
insert
is
screwed
into
the
hole.
If
properly
installed,
the
upper
surface
of
the
insert
should
be
about
0,1
mm
(0,005
in)
below
the
surface.
If
an
insert
is
damaged,
it
can
be
unscrewed
with
the
same
tool.
It is
advisable
to
heat
the
insert
with
a
soldering
iron
to
weaken
the
cement
before
unscrew
-
ing
the
insert.
3.5.
FIXTURES
It
will
almost
always
be
necessary
to
prepare
some
sort
of
fixture
to
act
as a
transition
from
the
Exciter
to
the
test
object.
This
is
because
the
test
object
is
usually
attached
at
those
places
where
it
will
be fixed
in
service,
in
order
to
duplicate
field
conditions,
and
these
attachment
points
will
seldom
match
those
of
the
Exciter.
The
fixture
may
be a
simple
plate
with
holes
for
bolting
to
the
Exciter
and
for
mounting
the
test
object,
or
it
may
be a
very
complicated
structure.
Whether
simple
or
complex,
its
main
function
is
to
convey
the
force
generated
in
the
Exciter
to
the
test
object,
and
there-
fore
its
performance
can
be
crucial
to
the
test
.
It is
beyond
the
scope
of
this
book
to
do a
comprehensive
study
of
fixtures
.
However,
if
there
are
enough
interested
persons
in
a
given
geographical
area,
courses
in
fixture
de-
sign
can
sometimes
be
arranged.
Contact
your
B & K
representative
for
more
informa-
tion.
16

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