Shure SM81 Manual

Shure Mikrofon SM81

Læs gratis den danske manual til Shure SM81 (20 sider) i kategorien Mikrofon. Denne vejledning er vurderet som hjælpsom af 49 personer og har en gennemsnitlig bedømmelse på 3.8 stjerner ud af 25 anmeldelser. Har du et spørgsmål om Shure SM81, eller vil du spørge andre brugere om produktet?

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MODEL SM81
UNIDIRECTIONAL CONDENSER MICROPHONE
The Shure Model SM81 is a high-quality, unidirectional
condenser microphone designed for studio recording, broad-
casting, and sound reinforcement. Its wide frequency re-
sponse, low noise characteristics, and low RF susceptibility
have made it a standard for applications involving acoustic in-
struments, especially guitar, piano, and cymbals.
The SM81 is ruggedly constructed. It operates on phantom
power and performs over a wide range of temperatures and hu-
midity conditions. It is furnished with a swivel adapter, attenua-
tor-switch lock, foam windscreen, and case for carrying and
storage. Other accessories are available.
Model SM81 Features
•20 Hz to 20 kHz frequency response
•Flat response curve for accurate reproduction of sound
sources
•Low noise and high output clipping level
•Low distortion over a wide range of load impedances
•Cardioid polar pattern, uniform with frequency and symme-
tric about axis, providing maximum rejection and minimum
coloration of off-axis sounds
•Low RF susceptibility
•Selectable low-frequency response: flat, 6 or 18 dB/octave
rolloff
•0 dB/10 dB lockable attenuator switch
•Phantom powering (DIN 45 596 voltages of 12 to 48 Vdc)
•Rugged steel construction for durability
•Field-usable over wide range of temperature and humidity
conditions
SPECIFICATIONS
Type
Condenser (electret bias)
Frequency Response
20 to 20,000 Hz (see Figure 1)
20 200001000 10000
50 100
98765432 98765432
+10
0
–10
Hz
dB
1 METER
TYPICAL FREQUENCY RESPONSE
FIGURE 1
Polar Pattern
Cardioid (unidirectional) response—uniform with
frequency, symmetrical about axis (see Figure 2)
150o
120o
150o
120o
180o
30o
60o
90o
30o
60o
90o
–5 dB
–10 dB
–15 dB
–20 dB
0
500 kHz
100 Hz
1 kHz
150o
120o
150o
120o
180
o
30o
60 o
90o
30 o
60o
90o
–5 dB
–10 dB
–15 dB
–20 dB
0
2 kHz
5 kHz
10 kHz
TYPICAL POLAR PATTERNS
FIGURE 2
Output Impedance
Rated at 150 Ω (85 Ω actual)
Recommended minimum load impedance: 800 Ω (May
be used with loads as low as 150 Ω with reduced clip-
ping level)
Output Configuration and Connector
Balanced, transformer-coupled output; male XLR con-
nector
Sensitivity (at 1,000 Hz)
Open Circuit Voltage –45 dBV/Pascal (5.6 mV). . . . . . . (1 Pascal = 94 dB SPL)
Clipping Level (at 1,000 Hz)
800 Ω Load –4 dBV (0.63 V). . . . . . . . . . . . . . . . . . . . . . .
150 Ω Load –15 dBV (0.18 V). . . . . . . . . . . . . . . . . . . . . .
Total Harmonic Distortion
Less than 0.5% (131 dB SPL at 250 Hz into 800 Ω load)
Model SM81 User Guide
27B2916 (BJ)
E2002, Shure Incorporated Printed in U.S.A.
2
Maximum SPL (at 1,000 Hz)
800 Ω load 136 dB (attenuator at 0). . . . . . . . . . . . . . . .
146 dB (attenuator at –10)
150 Ω load 128 dB (attenuator at 0). . . . . . . . . . . . . . . .
138 dB (attenuator at –10)
Hum Pickup
–3 dB equivalent SPL in a 1 mOe field (60 Hz)
Self-Noise (equivalent sound pressure levels; measured
with true rms voltmeter)
16 dB typical, A-weighted
19 dB typical, weighted per DIN 45 405
Signal-to-Noise Ratio
78 dB (IEC 651)* at 94 dB SPL
*S/N ratio is difference between microphone output at 94 dB SPL
and microphone self-noise A-weighted.
Overvoltage and Reverse Polarity Protection
Max. external voltage applied to pins 2 and 3 with
respect to pin 1 + 52 Vdc. . . . . . . . . . . . . . . . . . . . . .
Reverse polarity protection 200 mA max.. . . . . . . . . . . .
(diode-clamped)
Polarity
Positive pressure on diaphragm produces positive volt-
age on pin 2 relative to pin 3
Cartridge Capacitance
54 pF
Low Frequency Response Switch Positions
Flat; –6 dB/octave below 100 Hz; –18 dB/octave below
80 Hz
Attenuator Switch Positions (Lockable)
0 or –10 dB
Power
Supply Voltage 11 to 52 Vdc, positive, pins 2 and 3. .
Current Drain 1.2 mA max.. . . . . . . . . . . . . . . . . . . . . . . .
Environmental Conditions
Temperature:
Storage – 29_ to 74_ C. . . . . . . . . . . . . . . . . . . . . . .
( 20–_ to 165_ F)
Operating – 6.7_ to 49_ C. . . . . . . . . . . . . . . . . . . . . .
(20_ to 120_ F)
Humidity:
Storage 0–95% relative humidity at room. . . . . . . .
temperature (72_ _to 80 F, 22_ to 27_ C)
Case
Steel construction with vinyl metallic paint finish and
stainless steel screens
Dimensions
See Figure 3
Weight
Net 230 grams (8 oz). . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Packaged 740 grams (1 lb 10 oz). . . . . . . . . . . . . . . . . .
Certification
Eligible to bear CE marking. Conforms to European
EMC Directive 89/336/EEC. Meets applicable tests and
performance criteria in European EMC Standard EN
55103 (1996) parts 1 and 2 for residential (E1) and light
industrial (E2) environments.
OPERATION
Power
The SM81 requires phantom power. This may be supplied
to the microphone by a mixer, preamplifier or console with built-
in phantom power or from an external power supply (such as
the Shure model PS1A). Phantom power sources providing be-
tween 11 and 52 Vdc are suitable.
Use only high-quality cables because intermittent shorts
between broken shield wires and balanced conductors will
cause extremely large noise transients in the system. Avoid
ground loops due to grounded connector shells or the micro-
phone case touching other grounded metal objects. Follow
generally accepted audio grounding practices.
Impedance
A minimum load impedance of 800 Ω or greater should be
used for maximum signal handling and minimum distortion. The
load may be as low as 150 Ω, but a reduction in output clipping
level will result. It should be noted that the power supply itself
may add loading (3300 Ω in the Shure PS1A power supply) to
the microphones.
PS1A Power Supply
When using the Shure PS1A to phantom power the SM81,
connect the microphone cable to the SM81 and to the MICRO-
PHONE connector of the power supply. The power supply uses
the balanced audio cable pair to carry the supply current to the
microphone and the cable shield as a ground return.
Connect the OUTPUT connector of the power supply to a
low-impedance microphone input of a mixer, audio console or
tape recorder. A second SM81 may be connected to the re-
maining power supply channel in a similar manner.
212 mm
20 mm
23.5 mm
OVERALL DIMENSIONS
FIGURE 3

Produkt Specifikationer

Mærke: Shure
Kategori: Mikrofon
Model: SM81

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