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  9. Shure VR230B User manual

Shure VR230B User manual

UNIDIRECTIONAL DYNAMIC HEAD-WORN MICROPHONE
"
222 HARTREY AVE EVANSTON, IL, 60202-3696
US
A
TELEX 72-4381
ME
SOUND
OF
ME
PROFESSIONALS~
WORLDWIDE
PHONE 312/866-2200 CABLE SHUREMlCRO
MICROPHONES AND ELECTRONIC COMPONENTS
J
GENERAL
The VR230B combines an efficient "open-air" head-
phone with a wide-frequency-range, close-talking
dynamic microphone. The headset-microphone com-
bination is very lightweight and durable, and extremely
comfortable.
The VR230B microphone is particularly useful for
voice processing and computer voice recognition. Its
close-talking characteristics and unidirectional pickup
pattern reduce unwanted background noise, permitting
its use in noisy environments. The microphone
characteristics are tightly controlled resulting in con-
sistent response and output, while the receiver
response is especially tailored to enhance voice in-
telligibility.
The headband easily adjusts to fit any head size or
hairstyle, and the microphone boom length and car-
tridge position are fully adaptable to any facial
conformation. The VR230B's light weight reduces user
fatigue even when worn for long sessions.
DATA
SHEET
MODEL
VR230B
I
SPECIFICATIONS
MICROPHONE
Type
Dynamic, Close-Talking
-
TYPICAL MICROPHONE FREQUENCY RESPONSE
FIGURE
1
Frequency Response
(at 8 mm (5116 in.])
50 to 15,000
Hz
(see Figure 1)
Polar Pattern
Cardioid (unidirectional) response- uniformwith fre-
quency, symmetrical about axis (see Figure 2)
TYPICAL POLAR PATTERN
FIGURE
2
Impedance
Microphonerating impedance is 150ohms(200ohms
actual) for connection to microphone inputs rated at
19 to 300 ohms
Output Level
(close-talkedat 1,000 Hz)
...........
Open Circuit Voltage -47.0 dB(4.5 mV)
0 dB
=
1volt per 100 microbars
Power Level
..........................
-
66.0 dB
0 dB
=
1 milliwatt per 10 microbars
Hum Sensitivity
(typical)
38.4 dB equivalent SPL in millioersted field
Phasing
Positive pressure on diaphragm produces positive
voltage on red cable lead
RECEIVER
Type
Dynamic, open air, left side only
Frequency Response
100 to 10,000 Hz, tailored for voice intelligibility (see
Figure 3)
TYPICAL RECEIVER FREQUENCY RESPONSE
FIGURE
3
Copyright 1985, Shure Brothers
Inc.
27A2177
(EJ)
Printed in
U.S.A.
Impedance
8
ohms at 1,000
Hz
Phasing
Positive voltage on cable conductor produces
positive pressure
Output Level
(at 1,000 Hz)
94 dB SPL at ear with 1 mW input
RED SHIELD
CODED
i,
/
CODED
\
.
_'-
-
-
-
-
-
L
TERMINAL
SHIELD
------
4i
BLACK
-
CODED
1)
-
-
-
-
-
-
-
-
TERMINAL
RECEIVER
INTERNAL CONNECTIONS
FIGURE
4
GENERAL
Cable
2.4m
(8
ft) attached, two single-conductor shielded
cables
Headset
Stainless steel and thermoplastic with foam earpads
Dimensions
See Figure
5
12.7mmJ
(112
IN.)
OVERALL DIMENSIONS
FIGURE
5
Net Weight
90 grams (3.17 oz)
USING THE MICROPHONE
Snap the microphone boom into the rotating holder
below the left earpiece. Put on the headset and adjust
the earpads to the most comfortable position.
(Remember that this headset is designed only for use
with the microphoneonthe left side.) Slideand twist the
microphone boom, and rotate its holder, until the
microphone is located as close as possible to the left
corner of the mouth (not directly in front). See Figure 6
for optimum microphone position.
L:i:~
or
mare
-4
t13mm
(112
in.)''
less
LOCATE MICROPHONE AT CORNER OF MOUTH
FIGURE
6
GUARANTEE
This Shure product isguaranteed in normal use to be
free from electricaland mechanical defects for a period
of one year from date of purchase. Please retain proof
of purchase date. This guarantee includes all parts and
labor. This guarantee is in lieu of any and all other
guarantees or warranties, express or implied, and there
shall be no recovery for any consequential or incidental
damages.
SHIPPING INSTRUCTIONS
Carefully repackthe unit, have it insured, and returnit
prepaid to: Shure Brothers Incorporated
Attention: Service Department
222 Hartrey Avenue
Evanston, Illinois 60202-3696
If outside the United States, return the unit to your
dealer or Authorized Shure Service Center for repair.
The unit will be returned to you prepaid.

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