Filter
Top Products
2
SPECIFICATIONS
WM98 MICROPHONE (with standard test cir-
cuit–Figure
6)
SM98A MICROPHONE
Type
Condenser (electret bias)
Frequency Response (Figs. 1–2)
40 to 20,000 Hz
Polar Pattern (Figs. 3–4) Unidirectional (cardioid) or supercardioid with A98SPM Supercardioid Polar Modifier
Output Impedance
1200
Ω
Rated at 150
Ω
(90
Ω
actual)
Recommended minimum load impedance:
800
Ω.
. . . . . .
(May
be used with loads as low as 150
Ω
with reduced
clip
-
ping level)
Output Level
(0 dB = 1 volt per
mbar)
Open
Circuit
V
oltage –74 dB (0.2 mV).
. . . . . .
Open Circuit V
oltage
–80 dB (0.10 mV)
.
. . . . . .
Output
Clipping Level
(at 1,000 Hz)
–3 dBV (0.70 V)
800
Ω
Load, ILP–1 gain = 0 dB
0 dBV (1.0 V)
.
. . . . . . . . . . .
800
Ω
Load, ILP–1 gain = +10 dB
–7 dBV (0.45 V)
.
. . . . . .
150
Ω
Load ILP–1 gain = 0 dB
–13 dBV (0.22 V)
150
Ω
Load ILP–1 gain = +10 dB
–21 dBV (0.09 V)
.
. . . . .
Total
Harmonic Distortion
Less than 1% (134 dB SPL at 1,000 Hz) Less than 1% (132 dB SPL at 1,000 Hz)
Maximum SPL
145 dB
800
Ω
Load,
ILP–1 gain at 0 dB
155 dB
.
. . . . . . . . . . . . . . .
800
Ω
Load,
ILP–1 gain at +10 dB
138 dB
.
. . . . . . . . . . . . .
150
Ω
Load, ILP–1 gain at 0 dB
145 dB
.
. . . . . . . . . . . . . . .
150
Ω
Load, ILP–1 gain at +10 dB
127 dB
.
. . . . . . . . . . . . .
Dynamic Range (maximum SPL to
A-weighted
noise level)
11
1 dB
121 dB (800
Ω
load,
ILP–1 gain at 0 dB)
Output Noise (equivalent SPL)
34 dB typical, A-weighted
40 dB typical, C-weighted
37 dB, weighted per DIN 45 405
Hum Pickup (electromagnetic)
N/A
–5 dB equivalent SPL in a 1 mOe field (60 Hz)
Signal-to-Noise Ratio
60 dB at 94 dB SPL (IEC 651) 60 dB at 94 dB SPL (IEC 651)
Response Shaping
N/A Flat/Lo
Cut Preamp switch; Lo Cut: 12 dB rollof
f below 80 Hz
Phasing Positive
pressure on
microphone diaphragm pro
-
duces positive voltage on pins 3 and 4 with re-
spect
to pin 1 (ground)
Positive
pressure on microphone diaphragm produces posi
-
tive voltage on pin 2 relative to pin 3 of preamplifier output
connector
Recommended
Operating V
oltage
1.5 to 6 V (pin 2 to pins 3 and 4)
11 to 52 Vdc Phantom; operational down to 9 Vdc with re-
duced
clipping level
Current Drain
60 to 180
mA
2.2 mA current drain at 52 Vdc, 1.8 mA at 1
1 Vdc
Environmental Conditions Operating T
emperatures –18
o
to 57
o
C (0
o
to 135
o
F)
Storage
T
emperatures –29
o
to 74
o
C (–20
o
to 168
o
F)
. . . . . . . . . . . . . . . . . . . .
Relative
Humidity
0 to 95% (operating or storage)
.
. . . . . . . . . . . . . . . . . . . . . .
Cable Microphone
: 1
.12
m (
3 f
t 8 i
n.)
, a
ttached
, t
wo-con-
ductor,
s
hielde
d w
it
h m
iniatur
e 3
– a
n
d 4
–pi
n c
on-
nectors (Switchcraf
t “
Tin
i Q
–G
” t
ype)
Microphone:
4
.6
m (
1
5 f
t)
, t
wo-conductor
, s
hielde
d w
it
h m
inia-
ture
3
–pi
n f
emal
e c
onnecto
r (
Switchcraf
t T
A4F
t
ype
) o
n e
ach
en
d t
o m
at
e w
it
h m
icrophon
e o
utpu
t a
n
d p
reamplifie
r i
nput
Case Microphone:
Brass construction with matte
black
finish
and black stainless-steel-mesh grille
Microphone: Brass construction with matte black finish and
black
stainless-steel-mesh grille
Amplifier: Steel construction with matte black enamel finish
Net W
eight
Microphone: 12 g (0.4 oz) Microphone: 12 g (0.4 oz)
g( )
Amplifier: 170 g (6 oz)
Certifications Conforms to European Union directives,
eligible
to
bear CE marking; meets European Union EMC
Immunity Requirements (EN 50 082–1, 1992);
RF
radiated (IEC 801–3); ESD
(IEC 801–2); EFT
(IEC
801–4).
TYPICAL POLAR PATTERNS
FIGURE 3
TYPICAL POLAR PA
TTERNS – SM98A WITH A98SPM
INSTALLED
FIGURE 4