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Types:
MKH
415,
435
and
815 models
T
and
TU
1.
General:
Qe
The
first
step
in
the
repair
of
a microphone
is
a functional
check
of
the
complete
unit.
This
can
be
carried
out
by connecting
the
microphone
to
an
amplifier
or
tape
recorder
and
speaking
into
it.
This
method
is however
not
very
informative.
The
sensi-
tivity,
maximal
pressure
level
and
noise
level
of
the
microphone
cannot
be determined
in
this
manner.
We
therefore
recommend
the
following
method:
Functionalcheck
using
Coupler
MKHP_ 1
Equipment
necessary:
a.
Signal
Generator
30 Hz
-
1 mV
-
10
V,
THD
= 0,5
%
b.
VTVM
eg.
RV
55
from
Sennheiser
electronic
c.
Balancing
transformer
eg.
from
Sennheiser
electronic
dad. Oscilloscope
e.
Galvanometer
+ 500 mV
(If Capsule
test
unit
not
available)
20 kHz,
RVZ
11
f.
Coupler
MKHP
1 from
Sennheiser
electronic
g-
Power
source
ie MZA
6-20r
MZN
5-1
from
Sennheiser
electronic
A functionalcheck
using
the coupler,
gives
an insight
into
the
operation
of
the
complete
microphone.
At
is
possible
to
measure
sensitivity
and
pressure
levels
and
also,
t
a
certain
degree,
to
carry
ou
checks
of
noise
levels.
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