Sony ECM-939LT User Manual

GENERAL
Type:
FET:
Mercury Battery:
Microphone Output
Terminal:
Dimensions:
Weight:
Finish:
PERFORMANCE
Directivity:
Frequency Response:
Output Impedance:
Output Level
(deviation + 3dB):
Power Requirements:
MICROFILM
SPECIFICATIONS
Electret condenser microphone
(with back-electret condenser)
Junction FET x 2
EVEREADY No. EPX675
Two Way Plug
16x 121mm
21/,, x 47/, inches
120g, 4.2 oz (including battery)
Silver Alumite
Uni-directional
70 Hz to 15,000 Hz
Low impedance unbalanced
Open circuit voltage*:
-70.0 dB (0.32 mV) ,
*0 dB =1 mW/10yubar at 1,000 Hz
Recommended load impedance is more
than 3kQ.
Normal operating voltage: 1.35 V DC
Minimum operating voltage: 1.1 V DC
Current drain: Less than 1.0mA
Battery life: Approx. 180 hours with
EVEREADY No. EPX675
Noise Level:
Maximum Sound
Pressure Input Level:
(at 1,000 Hz,
1 % distortion)
Dynamic Range:
Environmental
Temperatures:
Signal-to-noise ratio;
More than 42 dB (1,000 Hz, 1ubar)
Inherent noise; Less than 32 dB SPL
(0
dB
=2x
107
pbar)
wind
noise
*1:
(with the wind screen)
Less than 50dB SPL.
Induction
noise
from
external
magnetic
field
*2:
Less
than
5dB
SPL/m
gauss
*1
Wind
noise
is
the
value
measured
by
ap-
plying
a
wind
velocity
of
2
m/sec.
from
all
directions
to
the
microphone.
The
mean
value
is
taken
and
converted
to
the
equivalent
input
sound
level.
*2
The
external
magnetic
field
induction
noise
is
measured
with
the
microphone
placed
in
an
alternating
magnetic
field
of
50
Hz,
1
milligauss.
The
maximum
noise
value
is
taken
and
then
converted
to
the
equivalent
input
sound
level.
(OdB=2x 10% wbar)
126
dB
SPL
(0
dB
=2
x
10™
bar)
More than 94dB
-20°C to +60°C for storage
0°C to +60°C for operation
SON
Y.
SERVICE
MANUAL
Fa ee eee

Sony ECM-939LT Specifications

General

Sensitivity	-33dB ±3dB (0dB=1V/Pa at 1kHz)
Connector	XLR
Polar Pattern	Cardioid
Maximum SPL	130 dB
Type	Electret Condenser
Frequency Response	20 Hz - 20 kHz
Power Supply	Battery or Phantom Power
Power Requirements	1.5V DC
Output Impedance	200Ω ±30% at 1kHz