EasyManua.ls Logo

BRUEL & KJAER System V - Electrical Connections to Test Objects; Positioning the Exciter

BRUEL & KJAER System V
68 pages
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
3.6.4.
Electrical connections to
test
objects
The
test
object
mounted
on
the
Exciter
Head
may
have
electrical
connections
made
to it.
F
or
example,
cables
may
be
run
from
accelerometers
m
ount
ed on
the
test
object
for
measurement
or
contro
i p
urposes
.
Where
suc
h conn
ectio
ns
ar
e
made,
it
is
important
to
avoid
making
an
earth
(ground)
connection
to
the Exc
iter
H
ead
through
these
connec-
ti
on
s .
Such
an
earth
can
in
te
rfere
with
the
proper
fu
nct
io
ni
ng
of
t
he
inte
rlock
system
(
whi
ch
depends
on
the
earthing
of
the
Head
vi
a the E
xciter
Body)
and
can
cause
meas-
urement
or
contr
oi
errors
owing
to
the
creation
of
earth
loops
. In t
he
case
of
accelerome-
ters
mount
ed
on
the
test
object,
this
earth
co
nne
c
tion
can be
avoided
by
insulating
the
bodies
of
the
accelerometers
from
the
test
object.
using
for
example
insulated
stud
s
YP
0150
and
mica
washers
YP
0534
. If
the
test
object
is a
piece
of
electrical
equipment
with
its
frame
permanently
connected
to
an
energiz
ed
circuit.
then
the
test
object
itself
should
be
insulated
from
the
Exciter
Head.
3.7. P
OS
ITION
I
NG
TH
E EX
CITER
For
testing
of
structures
and
structural
models
it
is
quite
of
ten
necessary
to use
th
e Exci-
ter
in a
position
other
than
its
upright
position
.
The
Exciter
Body Type
4801
can, in
face
be
moved
through
a
full
360
0
circle
.
To
rotate
the
Exciter
Body,
loosen
the
large
hand
wheel
on
each
trunnion,
rotate
to
the
desired
angular
position,
and
re-tighten
the
hand
wheel.
The
technique
of
mounting
the
Exciter
will
vary
with
the
type
of
structure
. If,
for
in-
stance
, a
flexible
structure
is to
be
set
in
motion
and
the
Exciter
used
in
the
horizontal
position
to
move
il.
it
would
be
desirable
to
bolt
the
Exciter
Body
directly
to
the
floor
or
to
a
seismic
block
. On
the
other
hand,
it
is
sometimes
useful
to
hang
the
Exciter
in
some
position
facing
the
test
object.
In
this
case,
the
entire
Exciter
could
be
suspended
with
elastic
ropes.
The
Exciter
Base can be
removed
,
if
desired
and
the
Body
and
Head
sus
-
pended
by
an
eye-bolt
arrangement
screwed
into
the
threaded
holes
in
the
lower
bowl
.
When
working
directly
over
a
structure,
the
exciter
can
be
slung
from
ordinary
ropes .
."
tE
= 3
- -
-~
..
-....,
..
Fig
.3. 2.
Using
the
4805
1
14
in
an
infrasonic
ex
periment
19

Table of Contents

Related product manuals