Schoeps CMIT 5 U, User Manual

Page: 13 / 15

DC
generator
regulator
micro
controller
, LEDs
preamp
impedance
converter
filter
1
push-
buttons
filter
2
filter
3
output
stage
RFI
filter
[1]
+Phase:
an
excursion
of
the
diaphragm
towar
ds
the
back
electr
ode
(positive
pr
essur
e
phase)
leads
to
a
positive
signal
at
this
pin
[2]
Matched
(i.e.
matching
tolerance
of
only
0.7%),
see
page
19
[3]
H
er
e
ar
e
th
re
e
si
m
pl
e
m
et
ho
ds
f
or
v
er
ify
in
g
co
rr
ec
t
ph
an
to
m
p
ow
er
in
g.
These
measur
ements
should
be
made
at
an
unused
input.
Reduce
the
channel
gain
to
the
minimum
to
pr
otect
the
loudspeakers,
etc.
If
micr
o-
phones
ar
e
connected
to
other
inputs
at
the
same
time,
no
substantial
di
ff
er
en
ce
s
ho
ul
d
oc
cu
r
in
t
he
r
es
ul
ts
.
1.
Measur
e
the
open-cir
cuit
voltage
between
gr
ound
(pin
1)
and
either
pin
2
or
pin
3
of
the
XLR
input.
Given
the
permitted
tolerances,
this
voltage
should
be
between
44
and
52
VDC
for
P48.
Then,
measur
e
the
short-cir
cuit
curr
ent
between
gr
ound
(pin
1)
and
either
pin
2
or
pin
3
of
the
XLR
input.
Given
the
permitted
tolerances,
this
curr
ent
should
be
between
5.9
and
8.5
mA
DC
for
P48.
N
ot
e:
W
el
l-d
es
ig
ne
d
ph
an
to
m
p
ow
er
s
up
pl
ie
s
m
us
t
to
le
ra
te
a
t
le
as
t
a
temporary
short
cir
cuit
without
damage;
an
unbalanced
connection
(w
hi
ch
is
o
cc
as
io
na
lly
n
ec
es
sa
ry
) w
ou
ld
c
au
se
t
he
s
am
e
cu
rr
en
t
to
b
e
drawn.
To
b
e
sa
fe
,
ho
w
ev
er
,
do
n
ot
le
av
e
th
e
sh
or
t
ci
rc
ui
t
cl
os
ed
f
or
a
ny
longer
than
necessary
.
2)
Measur
e
the
DC
voltages
on
the
modulation
leads
with
a
micr
o-
phone
connected,
e.g.
by
opening
the
connector
shell
of
the
cable.
The
tw
o
vo
lta
ge
s
(f
ro
m
p
in
2
a
nd
p
in
3
t
o
pi
n
1)
m
us
t
be
id
en
tic
al
. T
hey
should
be
about
33
Volts
(minimum
=
29
Volts).
3)
For
P48,
use
a
SCHOEPS
PHS
48
tester
. Plug
it
in;
if
the
LED
glows
and
stays
lit,
all
is
well.
3 1 2
Phantom- powering
[3]
U
s
=
+48
V
R
s
[2]=
6.8
k
Ω
R
s
[2]=
6.8
k
Ω
Preampli
-
fier
,
recorder or
mixing
desk
∼ ∼
scr
een
-phase
+phase
XLR-3 connector
XLR-3 connector
Pin
1:
scr
een
(GND)
Pin
2:
+phase[1]
Pin
3:
–phase
Bottom
view
(as
the
pins
ar
e
seen)
1
2
3
Microphone
-
cable
[3]
SCHOEPS
GmbH · Spitalstr. 20 · D-76227 Karlsruhe (Durlach) · Tel: +49 721 943 20-0 · Fax: +49 721 943 2050
www.schoeps.de · mailbox@schoeps.de
Block Diagram of the CMIT 5 U
26
English