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BROEL & KJ..€R
N cerum
-
Denmark
Consisting
of:
Removal of
the Case.
Service Instruct ions
Vibration Meter
Meter Circuit
Output Amplifier
Function
Sele~tor
Position of Components
Parts List
Circuit Diagram
2502.1
2502.2
2502.3
2502.4
2502.5
2502.6
2502
After removing the four HEX/HD
screws
on the front panel, it is possible to
slide
the chassis and the front panel
out of
the rack or
the wooden
case.
The
metal case con
be pulled out after the two screws on the bock panel hove been
removed.
Block Diagram
Accelerot1on
Density~
Input
Acc.Oens..
Alt
Function
Meter
Selector
Indication
l.F. Cut-Off
Vibration
(Remote
lewl
{Remote
Centro!.
Controt
Potentiom.rters from generator)
Function
(R~Mnote
Control
Selector
from
fromLL.ll)
{RernoteControl
geMrator
from
4411)
Trouble Shooting.
(-Control
from
generator)
l
DC
f
Output
Control
S1gnol
Output
If the reason for a fault is not on 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-
scr ibed in the adjustment procedure.
When the
troub le has been found and
remedied,
the
voltages
and adjustments
which
ore 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 ore
so small
as to
have no influence
on the measurements.
The instructions in this Manual ore 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.
Spore Ports.
Please state type and seria
l
number of apparatus
when
spa
re ports are ordered.
Instruments Necessary for Service
and
Repair:
Frequency Analyzer ty pe 2107
(El
ectronic
Voltmeter
type 2409)
Oscil loscope
Be
a
t Frequency Osci
ll
oscope ty pe 1013
Beat Frequency Osc
il
loscope ty pe
101
7
Frequency Counter
Mu ltimeter (50
IJA)
2502
-
3.67
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