BRUEL & KJAER 1008 Operating instructions
BROEL
&
KJ.ER
Ncerum
-
Denmark
Service
Instructions
Automatic
Vibration
Exciter
Control
Consisting
of:
Removal
of
the
Case.
Output Amplifier
Oscillator
Pick-up Amplifier
Compressor
M>tor Drive Circuits
Position
of
Components
Ports
list
Circuit Diagram
1008.1
1008.2
1008.3
1008.4
1008.5
1008.6
1008.7
1008.8
1008
After removing the eight HEX/HD screws on
the
front panel and the two screws in
the
bottom,
it
is
possible to slide the chassis
and
the front panel
out
of
the wooden
case.
For
rack mounting the metal
case
can
be pulled
out
after
the six HEX/HD screws on the side
of
the
instrument
are
removed.
Trouble Shooting.
If
the reason for a fault
is
not an obvious one such as a dead tube or transistor, broken down resistor, blown or disconnected
fuse
etc.,
then first test the voltages
of
all
the
tubes and compare them with
the
voltages shown in
the
circuit
diagram in order
to
loca-
lize
the
defect.
Should this method
of
finding the fault prove unsuccessful, then
check
the instrument by adopting
the
method
de-
scribed in
the
adjustment procedure. When the trouble has been found and remedied,
the
voltages and odjustmnets which
are
influ-
enced
by
the remedy
must
be
rechecked.
The
tolerances
stated
in
the
instructions can only be used as a guide
for
adjustment and
control,
but
any
deviations must not be
cor-
rected
without being sure
that
the tolerances
of
the instruments used
for
making
the
adjustment
are
so
small
as
to have no
influence
on the measurements.
The
instructions in this M>nual
are
given purely as a guide to the service
of
equipment with minor faults. Some faults, as
f.inst.
small deviations in tolerances require
for
their correction special control equipment and extensive
experience,
and
in these cases
it
is
necessary to send the instrument to the factory.
Spare Parts.
Please
state
type and serial number
of
apparatus when spare parts
are
ordered.
Instruments necessary
for
service and repair:
Frequency Analyzer type 2107
Oscilloscope
Frequency Counter
M.,ltimeter (50
µA)
1008 -
12.66
-BROEL
&
KJ,ER
Ncerum
-
Denmark
1.1. Calibration
of
Indicating
Meter.
METER
SWITCH:
"Output
Voltage"
SCANNING
SWITCH:
"Off"
FREQUENCY RANGE:
"5-5ooo
Hz"
COMPRESSOR
SPEED:
"Off"
OUTPUT
SWITCH:
"Linear"
FREQUENCY
SCALE:
"400 Hz"
1
.2.
Output
Voltage.
METER
SWITCH:
"Output
Voltage"
SCANNING
SWITCH:
"Off"
COMPRESSOR
SPEED:
"Off"
OUTPUT
SWITCH:
"Linear"
OUTPUT VOLTAGE: "10"
1.3 . Frequency Response .
a.
METER
SWITCH:
"Output
Voltage"
SCANNING
SWITCH:
"Off"
FREQUENCY RANGE:
"5-5ooo
Hz"
COMPRESSOR
SPEED:
"Off"
OUTPUT
SWITCH:
"Linear"
FREQUENCY
SCALE:
"400 Hz"
b.
FREQUENCY RANGE to "5005-lOooo Hz"
c.
FREQUENCY RANGE to
"5-5ooo
Hz"
OUTPUT
SWITCH
to "High pass"
FREQUENCY
SCALE
to
"400Hz"
1008.1 -
12.66
Output
Amplifier
Valid
from
serial
no.
170230
0
P15
~
_,:'~
.y;.·Y~
.
• o-...: .. o
--
....
_
2117
1008.1
•
:::jt
Adjust
the
OUTPUT
VOLTAGE
for
10
Von
OUTPUT
socket.
Deflection on type
1008:10
V
If necessary adjust P
15.
Check
that
full
scale
deflection on type 1008 can
be
obtained in
the
entire
frequency range from 5-1
Oooo
Hz
.
Possible reason for
fault:
The blocking range
of
the cam discs on
the
rear
side
of
CV
0009
is
within
the
frequency
range.
Too
low
LF
signal across R
92.
The
voltage
~
hould
be
approx. 320
mV
. If not
check
item 2.
2.
Too
low
DC
voltage
on V
10
cathode.
Adjust
the
OUTPUT VOLTAGE for
an
18
dB
deflection
on type 1fl08•.
Vary the frequency
from
5-5ooo
Hz.
Deflection on type
1008:18
dB.
Tolerance:±
o.5
dB
Possible reason for
fault:
Defective tube V 8
Defective filter Z
3,4
Vary the frequency
from
5005-1
Oooo
Hz.
Deflection on type 1008: 18 dB.
Tolerance:
:1:1
dB.
Adjust the OUTPUT VOLTAGE
for
a
20
dB
deflection
on type
1008.
Change frequency
to
100
Hz
.
Deflection on type
1008:19.7
dB.
Tolerance:
:1:
o.2
dB.
Change frequency to 5 Hz.
Deflection on type
1008:
4 dB.
Tolerance:
:1:
2 dB.
1.4.
Noise.
METER
SWITCH:
"Output
Voltage"
SCANNING
SWITCH:
"Off"
FREQUENCY RANGE: "5-Sooo
Hz"
COMPRESSOR
SPEED:
"OfP'
OUTPUT
SWITCH:
"linear"
FREQUENCY
SCALE:
"400
Hz"
b.
METER
SWITCH
to
"Output
Voltage"
1.5.
Distortion.
METER
SWITCH:
"Output
Voltage"
SCANNING
SWITCH:
"Off"
FREQUENCY RANGE: "5-Sooo Hz"
COMPRESSOR
SPEED:
"Off"
OUTPUT SWITCH:
"linear"
1008.1 -
12.66
Remove V
4.
Place
the
instrument in its
case
or
screened
it
effectively
in
an
other
way.
Adjust
the
OUTPUT VOLTAGE for a
10
V
d~flection
on type
2107.
Meosure Noise: min.
70
dB
below 10 V.
If
the
noise level
is
too high remove tube V 7 and measure the noise
from
the
output amplifier
only:
min. 75
dB
below 10 V.
Possible reason for fault: Defective tube V 8
Adjust the
OUTPUT
VOLTAGE
for
a
10
V
deflection
on type 1008.
Check distortion
at
different frequencies: max. o.
5o/o
Attention: Bear in mind
that
21
07 only allows measurements
of
distortion down
to around o.5o/o without a
filter
type 1607
connected
between type 1008
and
2107 for
rejection
of
the
fundamental frequency.
Possible reason
for
fault: Defective tube V
7,8
BROEL
&
KJ.ER
Ncerum
-
Denmark
Removal
of
Tuning Capacitor CV 0009.
Oscillator
Valid
from
serial
no.
170230
1008.2
Remove the right hand side cover (when seen
from
the instrument front
plate)
of
the
capacitor
unit CV 0009.
Set the condenser to fully "turned in" position .
The
posi.tion
of
the condenser
is
checked with a
plate
of
insulating
material,which
strokes over the.stator plates, so
that
none
of
the rotor plates
is
above the stator
plates.
The
scale
pointer should naw point
at
220°.
If
not,
note carefully dawn the position
of
the pointer.
Remove
the multi-plugs and unsoldering the two leads to the oscillator coil
assembly. Unscrew the two knobs on the tuning spindle and remove the
scale
rim, pointer and
scale.
The
four screws, which secure
Tuning Capacitor CV 0009 to the front
plate,
can then
be
unscrewed
Replacing Tuning Capacitor _CV 0009.
After replacing
scale,
center
it
with reference to the spindle by means
of
a centering bush. Check
the
position
of
the condenser
with a
plate
of
insulating material
for
fully interleaved
capacitor
plates and fix the pointer to 220° or
to
the position noted
above.
Attention: Item 2.
1.
and 2.
2.
The
frequency
can
only be checked by means
of
a frequency counter or a frequency standard and an
---
oscilloscope.
The
voltage should
be
measured by means
of
a high impedance (law
capacity)
tube voltmeter.
D-r---t--+---+--1_
c
---4-+-+-+--+-4
C133~~~~~~;;==ril
Output 30 kHz and 35 kHz bottom view
2.1.
Fixed
Oscillator.
a.
FREQUENCY RANGE: "5005-10ooo
Hz"
b.
FREQUENCY
RANGE
to "5-5ooo Hz"
c.
METER
SWITCH: "Output Voltage"
SCANNING
SWITCH:
"Off"
FRfQUENCY RANGE: "5-5000 Hz"
COMPRESSOR
SPEED:
"Off"
OUTPUT
SWITCH:
"Linear"
FREQUENCY
SCALE:
"10Hz"
2.2.
Variable
Oscillator.
a.
METER
SWITCH:
"Output
Voltage"
SCANNING
SWITCH:
"Off"
FREQUENCY RANGE: "5-5ooo Hz"
COMPRESSOR
SPEED:
"Off"
OUTPUT
SWITCH: "Linear"
FREQUENCY
SCALE:
"5Hz"
b.
FREQUENCY
SCALE
to
"5oooHz"
1008.2 -12.66
Check the signal
on
the socket
"30kHz
and
35kHz"
(pin 4).
The
frequency should
be
35kHz.
If necessary adjust the iron core
"C"
in Z 2.
The
voltage should
be
approx.
2.7
V.
The
frequency should change to
30kHz.
If
not,
adjust the
air
trimmer "D" in Z 2 and
check
item a
again
.
Check
that
the frequency
at
the
"Output"
socket
is
10Hz
!o,5%.
If
not,
check
item
2.1.
b.
and
2.2.
Turn
FREQUENCY RANGE
to
0-5000
Hz.
Check the frequency
on
the
"Output"
socket:
5Hz
:!:o,5%,
If
necessary adjust C
133.
Check
that
the frequency on the
"Output"
socket (pin 1)
is
5 Hz.
If
not,
adjust the FREQUENCY
SCALE
ADJUSTMENT. Fine adjustment by a
knob and coarse adjustment by a screwdriver operated
capacitor.
In
case
that
the regulation range is tao far away
set
both
variable
trimmers in
mid position and adjust the
air
trimmer "8" in Z 2
for
5
Hz.
Check
that
the frequency
is
5ooo
Hz
.
If
not,
adjust
the
iron
core
"E" in Z 2 and
check
item a
again.
ZJ
P12
V8
R92
2.3.
Oscillator
Voltage.
a.
METER
SWITCH:
"Output
Voltage"
SCANNING
SWITCH:
"Off"
FREQUENCY RANGE: "5005-1
Oooo
Hz"
COMPRESSOR SPEED:
"300"
OUTPUT SWITCH:
"Linear"
b . COMPRESSOR
SPEED
to
"Off"
FREQUENCY RANGE to
"5-Sooo
Hz"
FREQUENCY
SCALE
to
"Sooo Hz"
c . FREQUENCY RANGE
to
"5005-10ooo
Hz"
FREQUENCY
SCALE
to
"5005Hz"
2.4.
Frequency
Drift.
METER
SWITCH: "Power Freq.
Beat"
SCANNING
SWITCH:
"Off"
FREQUENCY RANGE:
"5-Sooo
Hz"
OUTPUT SWITCH:
"Linear"
1
008.2
-
12.
66
bottom
view
Adjust
the
OUTPUT VOLTAGE for an
approx
.
halfscaledeflection
on
type
1008.
Adjust
the
iron
core
in Z 3
to
max.
deflection.
When FREQUENCY RANGE
is
changed
to
"5-5000
Hz"
the
deflection
must
change
max . 1
dB
.
Turn "Phase" (P 12) on the front
plate
to
min .
deflection
on
type
1008.
Check
the
voltage
across R
92:320
mV
.
If necessary
adjust
P
3.
Check
again
the
voltage
across R
92:
320
mV.
If
necessary
adjust
P
2.
Possible reason for
fault:
Defective
tube
V 5
filter
Z 3
capacitor
C «J
Set
the
FREQUENCY
SCALE
to
exactly
the
mains
frequency
Adjust FREQUENCY
SCALE
ADJUSTMENT until a
very
slow
beat
shows up.
Check
the
frequency
drift
after
a
period
of
20
min.
and
after
15
hours by
ad-
justment
of
the
FREQUENCY
SCALE
for a slow
beat
and
read
the
frequency
deviation
on
the
scale.
Tolerance:±
5Hz
for
each
period.
If necessary
adjust
the
trimmer
"A"
After
adjustment
check
item
2.2.
Attention:
If
an
instrument has
not
been
in use
fQ~
a
_
l~g
period,
frequency
drift
may
occur
due
to
humidity in
the
,
oscillator
circuit.
Therefore
keep
the
instrument
switched
on
1-2
days
before
any
adjustment.
B.
ROEL
&
KJ~R
Ncerum
-
Denmark
Pick-up
Amplifier
Valid
from
serial
no.
170230
1008.3
Sheet 1
Attention:
The
pick-up amplifier can only
be
checked and adjusted by means
of
a frequency counter or an oscilloscope and a
fre-
---
quency standard.
The
voltages should be measured by means of a high impedance
{low
capacity)
tube voltmeter.
Check
of
Pick-up amplifier using
keel.
Gen.
Input"
To
check this section set the switches as follows:
METER
SWITCH:
"Vibration Level"
SCANNING
SWITCH:
"Off"
COMPRESSOR
SWITCH:
"Off"
OUTPUT
SWITCH:
"Linear"
Switches not mentioned here
are
set in a position according to instructions.
3.1.
frequency Response.
FUNCTION
SELECTOR:
"Accel."
ACCELERATION
RANGE: "1"
{Acc.Gen.)
FREQUENCY
RANGE: "5-5ooo
Hz"
FREQUENCY
SCALE:
"500Hz"
b.
FREQUENCY
RANGE
to "5005-lOooo Hz"
3.2.
Sensitivity
of
Displacement.
a.
FUNCTION
SELECTOR:
"Displ."
DISPL.-VEL.RANGE:
"o.Ol"
(Acc.Gen.)
FREQUENCY RANGE:
"So.5ooo
Hz"
FREQUENCY
SCALE:
"500 Hz"
b.
FREQUENCY
SCALE
to
"looa
Hz"
c.
DISPL-VEL.RANGE to "1" (Ace
.Gen.)
FREQUENCY
SCALE
to "5Hz"
1008.3
-
12.66
Adjust
OUTPUT
VOLTAGE
for
an 18
dB
deflection on type 1008.
Change the frequency
from
10-5ooo Hz.
Deflection on type 1008: 18 dB.
Tolerance:±
o.S
dB.
Check and tolerance as under item
a.
Adjust
OUTPUT
VOLTAGE
for
an input voltage of
exactly
904 mV.
Deflection on type
1008:20
dB.
Tolerance:
i:
o .2 dB.
If
necessary adjust P 10
"Dispi/A
.G ."
AC
voltage
on
V 1
pin
1:7,8
V
pin
2:30
mV
pin
6:700
mV
Deflection
on
type
1008:8
dB.
Tolerance:±
o.2
dB.
Adjust
OUTPUT
VOLTAGE
for an input voltage of
exactly
9.04
mV.
Deflection on type
1008:19.7
dB.
If
necessary adjust P4 (located on printed
circuit
XC
0126)
Possible reason for fault: Defective capacitor C
29,
30
The
sensitivity adjustment
of
P 10 can be
set
1.5%
higher or latter
if
it
facili-
ties the adjustment
of
P
4.
3.3.
Sensitivity
of
Yeloci!y.
a.
FUNCTION
SELECTOR:
"Vel."
DISPL.-VEL.RANGE:
"o.l"
(Acc.Gen.)
FREQUENCY RANGE: "5-Sooo Hz"
FREQUENCY
SCALE:
"500Hz"
b.
FREQUENCY
SCALE
to
"1oooHz"
3.4.
Sensitivity
of
Acceleration.
FUNCTION
SELECTOR:
"Accel."
ACCELERATION RANGE: "1"
(Accei.Gen
.)
FREQUENCY RANGE:
"5-5ooo
HZ"
FREQUENCY
SCALE:
"500Hz"
3.5.
Check
of
Acceleration Range.
Adjust OUTPUT VOLTAGE for on input
voltage
of
exactly
57.6
mY.
Deflection on type
1008:20
dB.
Tolerance:±
o.2
dB.
If
necessary adjust P 9
"Vei./A.G."
AC
voltage
on
V1
pin
1:
7,8
V
pin
2:30
mY
pin 6: 700
mY
Deflection on type 1008:
14
dB.
Tolerance:±
o.2
dB.
Adjust OUTPUT VOLTAGE for an input
voltage
of
exactly
7.07
mY.
Deflection on type
1008:20
dB.
Tolerance:±
o.2
dB.
If necessary adjust P 13
"Accei./A.G."
AC
voltage
on V 1 pin
1:
190
mY
pin
2:7
mY
pin 6: 165
mY
FUNCTION
SELECTOR:
"Accel . " Adjust OUTPUT VOLTAGE to 20
dB
deflection
on type
1008.
ACCELERATION RANGE: "1"
(Accei.Gen.)
FREQUENCY RANGE: "5-Sooo Hz"
FREQUENCY
SCALE:
"500 H.
z"
b.
ACCELERATION RANGE to
"lO"(Accei.Gen.)
Deflection on type
1008:0
dB.
Tolerance:±
o.4
dB.
Adjust OUTPUT VOLTAGE to 20
dB
deflection
on type
1008.
ACCELERATION RANGE to"1 OO"{Accei.Gen.) Deflection on type 1008: 0
dB
.
Tolerance:±
o.4
dB.
Adjust
OUTPUT
VOLTAGE to
20
dB
deflection
on type
1008.
d.
AC..:ELERATION
RANGEto"1ooo"~cei.Gen.)
Deflection on type
1008:0
dB
.
Tolerance:±
o.4
dB.
Check a Iso "Acceleration Range•
at
10 .
kHz.
3.6.
Check
of
Dispi·
.-Vei.Range.
a.
FUNCTION
SELECTOR:
"Displ."
Adjust OUTPUT VOLTAGE to
20
dB
deflection
on type
loOe.
DISPL.-VEL.RANGE:
"o.Ol"
(Accei.Gen
.)
FREQUENCY RANGE: "5-Sooo
Hz"
FREQUENCY
SCALE:
"55 Hz"
b.
DISPL.-VEL.RANGE to "o.1
"(Accei.Gen.)
Deflection on type
1008:0
dB.
c . DISPL.-VEL.RANGE to
"1"
(Accei.Gen.)
Tolerance:±
o.4
dB.
Adjust OUTPUT VOLTAGE to
20
dB
deflection
on type
1008,
Deflection on type
1008:0
dB.
Tolerance:±
o.4
dB.
Adjust OUTPUT VOLTAGE to 20
dB
deflection
on type
1008.
d.
DISPL.-VEL.RANGE to "10"
(Accei.Gen.)
Deflection on type
1008:0
dB.
Tolerance:±
o
.4
dB.
e.
FREQUENCY
SCALE
to
"500Hz"
Check
and
tolerances as under item
a-
d.
FUNCTION
SELECTOR
to
"Vel."
1008.3
-
12.66
BROEL
&
KJ.ER
Ncerum
-
Denmark
Pick-up
Amplifier
1008.3
right side view
3.7.
Relay Functions.
b. FUNCTION
SELECTOR:
"Ace."
c.
FUNCTION
SELECTOR
to "Auto D-A"
Check
of
Pick-up amplifier using
"vel.
Gen.
Input"
3.
8.
Frequency Response.
a.
FUNCTION
SELECTOR:
"Vel ."
DISPL.-VEL-RANGE:
"o.01"
(Vei.Gen.)
VEL.GEN.RESPONSE: "Flat"
FREQUENCY
RANGE: "5-5ooo Hz"
FREQUENCY
SCALE:
"500Hz"
1008.3
-
12.66
Valid
from
serial
no.
170230 Sheet 2
013
07
06
OS
top view
Check by moving the frequency pointer that the relays 0
5-6-7
are
energized
according to the following
table.
Frequency scale:
Relay:
Tolerance:±
10%
30
05
100
05-06
300Hz
05-06-07
If
necessary loosen rotating
contact
of switch 0
27
(located on the tuning
spin,_
del
of
CV 0009} and adjust the switching point according to table.
Relays 0 2-'-3-4 should
energize.
Relays 0
2-3
and 0 13 should energize according to position of frequency
scale and cross over switch.
Adjust the
OUTPUT
VOLTAGE
for
a 15
dB
deflection on type 1008.
Change the frequency
from
5-2ooo
Hz
.
Deflection
on
type 1008: 15 dB.
Tolerance: t
o.2
dB.
b.
VEL.GEN.RESPONSE to "Shaped"
FREQUENCY
SCALE
to
"10Hz"
Frequency
scale
Hz
Deflection on type 1008
dB
Frequency
scale
Hz
Deflection on type 1008
dB
10
10
700
12.58
Adjust
the
OUTPUT VOLTAGE for a
10
dB
deflection
on type
1008.
Change the frequency
from
10-2ooo
Hz
and
check
the
deflection
on type
1008.
100 200 300
400
500
600
10.26 10.83 11.24
11.63
11
.
94
12.30
800
900
1000 '
'\
1250 1500 2000
12.92 13.15 13.52 14.16
14.80
16.19
Tolerance, for frequencies
10-1000
Hz:±
o,3
dB
1250-2000
Hz:!
o,5
dB
3.9.
Sensitivity
of
Velocity·
FUNCTION
SELECTOR:
"Vel."
DISPL.-VEL.RANGE:
"o.01"
(Vei.Gen.)
VEL.GEN.RESPONSE:
"Flat"
FREQUENCY RANGE: "5-Sooo Hz"
FREQUENCY
SCALE:
"500
Hz"
3.10.Sensitivity
of
Displacement.
a.
FUNCTION
SELECTOR:
"Displ •
'"
DISPL.-VEL.RANGE:
"o.01"
(Vei.Gen
.)
VEL.GEN.'RESPONSE:
"Flat"
FREQUENCY RANGE: "5-Sooo Hz"
FREQUENCY
SCALE:
"500 Hz"
b.
FREQUENCY
SCALE
to
"1oooHz"
3.11.
Sensitivity
of
Acceleration.
a.
FUNCTION
SELECTOR:
"Accel."
VEL.GEN.RESPONSE:
"Flat"
ACCELERATION RANGE:
"1"
(Vei.Gen.)
FREQUENCY RANGE: "5-Sooo Hz"
FREQUENCY
SCALE:
"500Hz"
b.
FREQUENCY
SCALE
to
"250Hz"
1008.3 -12.66
Adjust OUTPUT VOLTAGE for an input
voltage
of
exactly
6.8
mV
.
Deflection on type
1008:20
dB.
Tolerance:±
o.2
dB.
If necessary adjust P 6
"Vei./V.
G."
AC
voltage
on V 1 pin
1:
450
mV
pin
2:1,8
mV
pin
6:45
mV
Adjust
the
OUTPUT VOLTAGE for
an
input
voltage
of
exactly
1.07
V.
Deflection on type-1 008:
20
dB.
Tolerance:±
o .2
dB
If necessary adjust P 8
"Dispi./V
.G."
After adjustment
of
P 8
check
item 3.11
AC
voltage
on V 1 pin
1:7,6
V
pin
2:28
mV
pin
6:
680
mV
Deflection on type
1008:14
dB.
Tolerance:±
a.2
dB.
Adjust
the
OUTPUT VOLTAGE
for
an input
voltage
of
exactly
8.36
mY.
Deflection on type 1008:
20
dB.
Tolerance:±
o.2
dB.
If necessary adjust P 7
"Accei./V.
G."
After adjustment
of
P 7
check
Item
3.10
AC
voltage
on V1 pin
1:340mV
pin
2:3,5
mV
pin
6:29
mil
Deflection on type
1008:14
dB.
Tolerance:±
o.2
dB.
BRlJEL
&
KJ.ER
Ncerum
-
Denmark
Pick-up
Amplifier
1008.3
Valid
frQm
serial
no.
170230
3.12.
Check
of
Acceleration
Range.
a.
FUNCTION
SELECTOR:
"Accel."
Adjust OUTPUT VOLTAGE
to
20
dB
deflection
on type
1008.
VEL.GEN.RESPONSE:
"Flat"
ACCELERATION RANGE:
"1"
(Vei.Gen.)
FREQUENCY RANGE:
"5-5ooo
Hz"
FREQUENCY SCALE: "500 Hz"
b.
ACCELERATION RANGE
to
"1
0"
(Vel.
Gen.)
Deflection on type
1008:
0 dB.
Adjust OUTPUT VOLTAGE
to
20
dB
deflection
on type
1008.
c.
ACCELERATION RANGE
td'100"(Vei.Gen.)
Deflection on type
1008:0
dB.
Adjust OUTPUT VOLTAGE
to
20
dB
deflection
on type
1008.
d.
ACCELERATION RANGE
to
"1
ooo"(Vei .
Gen
.)
Deflection on type
1008:
0 dB.
3.13.
Check
of
Displ.-Vei.Ronge.
a.
FUNCTION
SELECTOR:
"Displ."
Adjust OUTPUT VOLTAGE
to
20
dB
deflection
on type
1008.
VEL.GEN.RESPONSE:
"Flat"
DISPL.-VEL.RANGE:
"o.Ol"
(Vei.Gen.)
FREQUENCY RANGE:
"5-5ooo
Hz"
FREQUENCY SCALE:
"5Hz"
b.
DISPL.-VEL.RANGE to
"o.1"
(Vei.Gen.)
Deflection on type
1008:0
dB
.
Adjust OUTPUT VOLTAGE
to
20
dB
deflection
on type
1008.
c.
DISPL.-VEL.RANGE to
"1"
(Vei.Gen.)
Deflection on
type
1008:0
dB
.
Adjust OUTPUT VOLTAGE
to
20
dB
deflection
on
type
1008.
d.
DISPL.-VEL.RANGE
to
"10"
(Vei .
Gen.)
Deflection on type
1008:0
dB.
e.
FUNCTION
SELECTOR
to
"Vel."
Check Displ.
-Vel.
Range
again
at
500
and
2ooo
Hz.
1008
3.14.
Noise-Microphony.
.-
0
-~j=
· ·
·jt·
·::i~·
.:
..
·:
·
Check
and
tolerances
as
under
item
a-d
.
2117
Sheet 3
a.
FUNCTION SELECTOR:
"Vel."
DISPL.-VEL.RANGE:
"o.01"
(Vei.Gen.)
The instrument must
be
in its
case
or in
other
way
effectively
screened.
Disconnect
input
signal
to
both input amplifier "
Vel."
and
"Ace."
1008.3
-
12.66
Check
the
microphony by
gently
tapping on
the
front
plate
of
the
apparatus.
All
deflections
are
read
in
dB
below
10
V.
Velocity
with
velocity
generator
.
Noise:
Microphony: 45d8
30"
b.
FUNCTION
SELECTOR
to
"Displ."
Displacement with
velocity
generator
-.
Noise:
Microphony:
c.
FUNCTION
SELECTOR
to "Accl ." Acceleration with
velocity
generator
.
Noise:
Microphony:
d.
FUNCTION
SELECTOR
to
"Vel."
Velocity with
acceleration
generator.
Noise:
DISPL.-VEL.RANGE:
"o.01"
(Acc.Gen.)
Microphony:
e.
DISPL.-VEL.RANGE to
"o.1"
(Acc.Gen.)
Noise:
Microphony:
f.
FUNCTION
SELECTOR
to
"Displ."
Displacement with
acceleration
generator.
Noise:
DISPL.-VEL-RANGE to
"o.Ol"
(Acc.Gen
.) Microphony:
g.
FUNCTION
SELECTOR
to
"Accel."
Acceleration with
acceleration
generator.
Noise:
ACCELERATION RANGE
to
"1"
(Acc.Gen.)
Microphony:
Possible reason
for
Noise: Defective tube V 2
Defective
capacitor
C
15,
16
Defective
relay
0 2
Possible reason
for
Microphony: Defective tube V 1
1008.3
-
12.66
4.5
ds
.
40 "
32 "
25
"
32 "
25 "
45 "
40 "
45
"
35
"
50
"
30 "
SROEL
&
KJ.ER
N<Brum
-
Denmark
Compressor
Valid
from
serial no. 170230
1008.4
To
check this section set the switches as follows: SCANNING
SWITCH:
"Off"
OUTPUT
SWITCH:
"linear"
VEL.GEN.
RESPONSE:
"Flat"
Switches not mentioned here are set
in
a position according to instruc;tions.
right side
view
4.1.
Compressor
Balance.
METER
SWITCH:
"Output Voltage"
FREQUENCY
RANGE:
"5-5ooo
Hz"
COMPRESSOR
SPEED:
"Off"
FREQUENCY
SCALE:
"400
Hz"
4.2.
Compression.
pin 1
pin 1
Adjust
OUTPUT
VOLTAGE
for
a
o.7
Vdeflection
on
type 1008.
Adjust P1 until signals
on
the anodes
of
V 3 are equal.
Tolerance:±
2%
Possible reason
for
fault: Defective diode Q 13
Defective capacitor C 87,
88
Sheet 1
a.
METER
SWITCH:
"Vibration
level"
FREQUENCY
RANGE:
"5-5ooo
Hz"
COMPRESSOR
SPEED:
"100"
FUNCTION
SELECTOR:
"Vel."
DISPL.-VEL.RANGE:
Mo.
I"
(Vei.Gen.)
OUTPUT
VOLTAGE:
"10"
Adjust
DISPLACEMENT
VELOCITY
LEVEL
for
an
18
dB
deflection
on
type
Hi08.
FREQUENCY
SCALE:
M2()()
Hz"
1008.4 -12.66
b.
DIS
PL.
VEL.
RANGE
to
11
1
11
(Vel.
Gen.)
c .
DISPL.
VEL.RANGE to "10" (Vel.
Gen.)
4.3.
Compressor
Speed .
METER
SWITCH:
"Vibration Level"
FREQUENCY
RANGE: "5-5ooo Hz"
COMPRESSOR
SPEED:
"300
dB/sec."
FUNCTION
SELECTOR:
"Vel."
DISPL.-VEL.RANGE:
11
1"
(Vei.Gen.)
OUTPUT
VOLTAGE: "10"
FREQUENCY
SCALE:
"500Hz"
1008.4
-
12.66
Deflection on type
1008:18
dB
.
Tolerance:±
o.5
dB.
Deflection on type 1008:18 dB.
Tolerance:±
1
.3
dB.
012
011
010
01
rear
view
Adjust
DISPLACEMENT
VELOCITY
LEVEL
for
a 20dB deflection on type 1008.
By
changing DISPL.-VEL. RANGE
from
"1" to
"10",
the meter pointer
Vfill
move
against 0 and up
again.
Read
the lowest pointer.deflection
for
all
posi-
tions
of
COMPRESSOR
SPEED.
COMPRESSOR
SPEED:
10
30
100
300
1000
3000
Deflection read
on
the
meter
(C:,pprox.):
6
dB
10
II
14
II
17
II
18
II
19
II
:15 Frequency
Hz
50
150 500 1500
dB
deflection read on the meter (approx.)
Auto 1 6 10 10 10
II
2 6 10 14 14
II
3 6 10 14" 17
II
4 6
io
14 17
II
5 6 6 10 14
II
6 6 6 6 10
COMPR.
SPEED
po5ition
Auto
1:
10-30-
30-
30-
30
dB/sec.
2:
10-30-
100- 100-
100
dB/sec.
3:
10-30-
100-300-300
dB/sec.
4:
10-30-
100-300-1000
dB/sec.
5:
10- 10-
30-
100-
300 dB/sec.
6:
10-
10- 10-
30-
100 dB/sec.
10
14
17
18
17
14
BROEL
&
KJ.ER
Ncerum
-
Denmark
b.
OUTPUT
VOLTAGE to "0"
Compressor
Valid
from
serial
na.
170230
1008.4
Sheet 2
Check
that
the compressor relays
are
energized
according to
the
following
table.
COMPRESSOR
SPEED
Independent
of
position
of
FREQUENCY
SCALE
10
30 08
100
08-09
300
08-09-010
1000
08-09-010-011
3000
08-09-010-011-012
FREQUENCY
SCALE
Hz
-
30-100
100-300
300-1000
1000-5000
Auto 1 08 08 08 08
2 08
08-09 08-09
08-09
3 08
08-09
08-09-010
08-09-010
" 4 08
08-09
08-09-010
08-09-010-011
5 08
08-09
08-09-010
6
08
08-09
4.4.
Frequency Response with Velocity
Generator.
METER
SWITCH: "Vibration Level"
COMPRESSOR
SPEED:
"300
dB/sec."
FUNCTION
SELECTOR:
"Vel."
DISPL.-VEL.RANGE:
"1"
(Vei.Gen.)
OUTPUT
VOLTAGE: "10"
FREQUENCY RANGE:
"5-5ooo
Hz"
FREQUENCY
SCALE:
"500 Hz"
Adjust
DISPLACEMENT
VELOCITY
LEVEL
for
a 19dB
deflection
on type
1008.
Vary the frequency
from
5-2ooo
Hz.
Deflection on type 1008:
19
dB.
Tolerance:±
o.5
dB
.
By
turning DISPLACEMENT-VELOCITY
LEVEL
it
should
be
possible to
obtain
deflections
from
-2
dB
to
21
dB.
4.5.
Frequency Response with Acceleration
Generator.
METER
SWITCH: "Vibration Level" Adjust ACCELERATION
LEVEL
for
a 19
dB
deflection
on type
1008.
FREQUENCY RANGE:
"5-5ooo
Hz"
COMPRESSOR
SPEED:
"300
dB/sec."
Vary the frequency
from
10-1
0ooo
Hz.
FUNCTION
SELECTOR:
"Accel."
Deflection on type 1008i
19
dB.
ACCELERATION RANGE:
"1ooo"(Accei.Gen.)
Tolerance:±
o.5
dB
.
OUTPUT
VOLTAGE: "10"
FREQUENCY SCALH1ooo
Hz"
1008.4
-
12.66
By
turning ACCELERATION
LEVEL
it
should
be
possible
to
obtain
deflections
from
-2
to
21
dB.
4.6.
Gain
Reserve.
a.
METER
SWITCH:
"Output
Voltage"
FREQUENCY RANGE: "5-5ooo Hz"
COMPRESSOR
SPEED:
"300
dB/sec."
FREQUENCY
SCALE:
"1oooHz"
b.
COMPRESSOR
SPEED
to
"Off"
4.7.
Compressor
Meter.
METER
SWITCH: "Vibration Level Preset"
FREQUENCY RANGE:
"5-5000
Hz"
COMPRESSOR
SPEED:
"3000
dB/sec."
FUNCTION
SELECTOR:
"Accel."
FREQUENCY
SCALE:
"500
Hz"
1008.4 -
12.66
COMPRESSOR input disconnected
Adjust
the
OUTPUT VOLTAGE
for
a 20
dB
deflection
on type
1008.
Deflection on type
1008:Mox.
12
dB.
Possible reason for
fault:
Defective tube V
5.
Adjust ACCELERATION
LEVEL
for a 0
dB
deflection
on type
1008.
Check
that
the
deflection
on
the
Compressor Meter is
20
dB.
If necessary adjust P 17 {located on printed
circuit
XC
0355}-.
BROEL
&
KJ.ER
Ncsrum
-
Denmark
D
D
Removal
of
the Motor Unit.
~
?
~
;,
Motor
Drive
Circuit
Valid
from
serial
no.
170230
8 8
6 D
~
I v
_l
..1
.
.-.--
..
.
-:-.~:_
I
0
r---r--
-
-=---
r-r--
·~.
0-_
~r-
0
0
0
~
8 A 8
P14
D
c
D
1008.5
Sweep Control 8
Remove the meter and the lamp
for
frequency
dial.
By
removing
the
com "A"
and
the four screws
"B"
it
is
possible
to
pull the back
plate
away.
After rel)loving the multiplug
"C"
and the four screws "D" holding the motor
unit,
it
is
possible to
lift
the
motor up
through the hole in the upper Chassis.
5.1.
Adjustment
of
Motor Speed.
a.
SCANNING
SWITCH:
"On"
SCANNING
SPEED
SELECTOR:
"X
I"
SCANNING
SPEED:
"1.80"
b.
SCANNING
SPEED
SELECTOR
to "2.59"
1008.5
-
12,66
1008
The speed should
be
1
.80°
per min.
Tolerance:±
3%
If necessary adjust P 14 (Motor).
The
periodic time
of
the pulses should
be
24
m.sec.
measured on
"SweepCon-
trol
"B"
pin
6.
The
speed should be
2.59°
per min.
If necessary adjust potentiometer P I
The
periodic time
of
the pulses should be
18.69
m.sec.
a V1
V2
b b
c c V3
V4
Printed
circuit
XC
0130 d
5.2.
Fault Tracing for Motor Unit.
a.
SCANNING
SWITCH:
"Off"
SCANNING
SPEED
SELECTOR:
"1"
SCANNING
SPEED:
"1
.80"
Measuring Point a b c
DC
Voltage
-10
v
-10
v
-10
v
ov
-20
v
-20
v
-20
v ov ov
ov
-20
v
ov
-20
v ov
-20
v
1008.5 -12.66
If the motor does nor work, check the
24m
.sec.
pulses
on
SWEEP
CONTROL
Bsocket (pin 6) in order to
localize
the defect to
be
in
the pulse generator or
in
motor
unit.
If
the pulses are present on
SWEEP
CONTROL Bsocket check the de voltages
on
the transistors
in
the multivibrotor.
d e f g h
-10
v
The
two
multivibro-
tions
ore
working.
ov -
o,S
V +
2V
+
2V
-
o,S
V Tronsi$tor V 1 should
change over.
-20
v +
2V
-
o,S
V -
o,S
V +
2V
Transistor V
~
2
-.
should
change
over.
•.
-20
v -
o,S
V +
2V
-
o,S
V +
2V
Transistor V 3 should
change
over.
ov +
2V
-
o,S
V +
2V
-
o,S
V Transistor V 4 should
change
over.
Connect an oscilloscope to the
collector
of
the transistor which should
change
over according to the
table.
a.
The
pulses can not
be
obtained
on
the
collector
but the pulses ore on
the
bose.
This
transistor or accompanying.components may
be
defective.
b.
The
pulses can be obtained
on
the
collector.
The
transistor with which
it
is
matched is
defective.
.
BROEL
&
KJ.ER
Ncerum -Denmark
Com,_
or
l'ick-up
Arnplifitr
1008.6 -12.66
0
Position
of
Components
Valid
from
serial
no.
170230
1008.6
----.-,
I
0 I
0
Sheet 1
r-------------1
I 0
~ ~
0 I
I d I
I I
I I
I0 0 I
I I
I I
I I
I
___
o-----
---
-~
--
-'
Differentiating and Integration Circuits
Vel.
Gen.
Input Meter Circuit
Compressor Relays
1008.6 -12.66
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