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BRUEL & KJAER 2203 Service

BRUEL & KJAER 2203
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Att.
black:
"1
20
dB"
Att.
transp.:
"120dB"
Meter
Switch:
"Lin.-Fast"
Frequency
Response
Att.
black:
"1
20
dB"
Att.
transp.
:
"1
20
dB"
Meter
Switch:
"Lin.-Fast"
Meter
Switch
through
A , B
and
C
positions
Overshoot
Noise
Att.
black:
"1
20
dB"
Att
.
transp.:
"1
20
dB"
Meter
Switch:
"Lin.-Fast"
Meter
Switch
to
"
Lin.
-
Siow"
Att.
black
:
"70
dB"
Att.
transp.:
"
10dB"
Meter
Switch:
"A-Fast"
Att.
transp.
to
"30
dB"
Meter
Switch
to:
"Lin.-Fast"
Att
.
transp.
to
"fully
CCW
position"
Meter
Switch
to " Ext.
Filter-Fast"
Att.
balck
to
"1
30
dB"
Att.
transp.
to
"
fully
CCW
position
"
Meter
Switch
to
"
Lin.
-
Fast"
9.73
Checking and
Adjusting
2203.1
Apply
a
signal
of
3.45
V
RMS
to
the
input
of
2203
through
adaptor
JJ
2614,
and
turn
"Adj."
to
produce
3,16
Von
"Output".
Increase
the
input
signal
by 1 0 dB
and
check
that
the
voltage
on
"Output"
follows
the
1 0 dB
increase.
This
test
ensures
that
the
working
voltages
are
correct
in
the
different
amplifier
stages.
Adjust
an
input
signal
at 1 kHz
to
produce
an
8 dB
deflection
on
the
meter.
At
10Hz
P
201
on
ZE
0117
should
be
adjusted
for
a
deflection
of
9,5
dB±
0,25
dB.
At
25kHz
the
deflection
should
be
between
7
and
8 dB,
and
at
40kHz
between
6,5
and
7,5 dB.
(C
408
on
ZE
0118
can be
changed
between
2,7
pF
and
12
pF).
Change
frequency
to
1 kHz and
check
the
deflection
to be 8 dB.
The
deflection
should
remain
at 8 dB in all
positions
.
If
necessary
adjust:
P
202
in
position
A
P
203
in
position
B
P
204
in
position
C
onZE0117
The
Overshoot
when
connecting
a
2kHz
input
signal
should
be
checked
with
reference
to
a
constant
signal
producing
a
deflection
of 6 dB as
well
as - 5 dB.
Overshoot:
0,1
- 1,1 dB
(damping
resistor
is R
701
across
the
meter)
Overshoot:
0,1
-
1,6
dB
(damping
network
R
418
and C
413
on
ZE
0118)
The
instrument
must
be
in
its case, "
Adj.
"
turned
to a
K-factor
reading
of
OdB
, and
the
input
should
be
terminated
with
a
capacity
of
approx.
50
pF
. The
best
way
to
arrange
this
is
to
shortconnect
the
input
of
a
JJ
261
5
Adaptor
,
which
has
already
a
50
pF
Glass-capacitor
built
in.
If
this
Adaptor
is
not
available
, a
50
pF
capacitor
can be
mounted
inside
a B & K Plug
JP
01 01
which
is
then
connected
to
the
input
via
JJ
261
4,
but
this
methode
is
more
critical
as
regards
moisture
on
contacts
etc
.
Max
.
noise
deflection
4 dB
on
the
meter
.
Max.
noise
deflection
3 dB
on
the
meter
.
If
the
noise
exceeds
these
limits
, proceed as
follows
:
If
a
Frequency
Analyzer
is
available,
it
should
be
checked
whether
the
noise
is caused by
the
DC
Converter
.
This
is
done
by
measuring
selectively
around
1,
2
and
3kHz
on
"Output".
(max
.
50
mV).
If
the
deflection
exceeds -
10dB
on
the
meter
,
the
Output
Amplifier
ZE
0118
seems
to be
causing
the
noise
.
If
the
deflection
is
below
- 1 0 dB, proceed as
follows
:
If
the
deflection
now
exceeds
full
scale
the
source
of
noise
is
somewhere
in
the
Input
Ampli-
fier
ZE
0117
(Probably V
201
to
204)
.
If
the
deflection
is less
than
full
scale
the
source
of
noise
is
found
in
the
Impedance
Conver-
ter
ZE
0116
(Probably V
101
or
1
02)
.
Valid
from
serial
no.
4671
52
1-3

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BRUEL & KJAER 2203 Specifications

General IconGeneral
BrandBRUEL & KJAER
Model2203
CategoryMeasuring Instruments
LanguageEnglish

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