Shure VP88 Bruksanvisning

Shure mikrofon VP88

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Model VP88 User Guide
©2005, Shure Incorporated
27C3043 (Rev. 7) Printed in U.S.A.
FEATURES
•
Time-coherent, Mid-Side (M-S) design for optimal
stereo imaging.
•
Built-in stereo matrix for direct control of the stereo spread; di-
rect M-S outputs provided.
•
40 to 20,000 Hz frequency response.
•
Low noise and distortion, wide dynamic range.
•
Switch-selectable, low-frequency roll-off (12 dB/octave
below 80 Hz) for reduced pickup of ambient noise and stand
vibration.
•
Phantom power or 6V camera battery with LED power
indicator.
•
Internal shock mount for reduced stand vibration and
handling noise.
•
Impact resistant, durable construction.
•
Integrated heavy-duty “pop” screen.
•
Windscreen, swivel mount adapter, and Y-cable
included.
GENERAL DESCRIPTION
The Shure Model VP88 is a stereo microphone equally effective
in studio broadcasting applications as in the field for electronic
news gathering (ENG).
This stereo microphone combines two condenser cartridges in a
single housing, in a mid-side (M-S) microphone cartridge configu-
ration. One cartridge (Mid) faces forward to capture on-axis sound
in a cardioid pattern. The other cartridge (Side) is bi-directional,
capturing sound from either side.
Containing three settings for different degrees of stereo image
separation, the VP88 contains an internal M-S matrix that can be
bypassed if an external matrix is used, or if stereo imaging is done
in post-production. External switches control output mode, stereo
imaging, low-frequency roll off settings, and battery on/off.
When the VP88 is set for stereo mode operation (H, M, or L), the
left and right signals should remain fully separated and kept at
equal levels to maintain a balanced stereo effect.
MOUNTING
The VP88 can be mounted on a standard microphone floor
stand, fishpole or boom. Make sure the front of the grille faces the
sound source and the top of the microphone faces up, so that the
the resulting stereo image matches the left and right components
of the sound source.
MICROPHONE ORIENTATION
FIGURE 1
A88SM External Shock Mount
The optional A88SM Shock Mount provides optimum isolation
from stand-transmitted shock and vibration. The A88SM is ideal for
critical studio applications and contains a standard mounting foot
for use with most electronic news gathering (ENG) video cameras.
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POWER
Phantom Power
The VP88 can operate on an internal 6V battery or phantom
power from any microphone mixer or console providing 9 to 52
Vdc, or by a phantom power supply such as the Shure PS1A. Each
balanced audio cable pair (pins 2 and 3: Mid/Left; pins 4 and 5:
Side/Right) carries the supply current to the microphone, and the
cable shield (pin 1) is the ground return.
The Mid or Side output can be used individually with either
phantom or battery power. When operating in the Stereo mode
without battery, both Mid/Left and Side/Right outputs must be
phantom powered.
Battery Power
If phantom power is not available, move the Battery switch to the
Batt On position. The adjacent LED will flash indicating at least five
hours of useful battery life, and if no flashing is observed the
battery should be replaced. The battery does not drain when
phantom power is applied.
Installing and Replacing the Battery
The VP88 uses a 6V cylindrical battery commonly used in
cameras. Average battery life depends on the type of battery:
typically 70 hours for silver oxide/lithium and 40 hours for alkaline.
LIST OF REPLACEMENT AND COMPATIBLE BATTERIES
TABLE 1
To install or replace the battery, proceed as follows:
1. Disconnect the microphone cable and unscrew the VP88
lower handle.
2. Carefully slide the lower handle away from the grille,
exposing the battery compartment. If necessary, remove
the old battery.
3. Insert the new battery, observing the polarity marking in the
battery compartment.
4. Slide the lower handle back into position and tighten.
CONNECTIONS
Use the supplied Y-splitter cable to connect the VP88 to two
inputs of a mixer or console.
The red connector, marked “M” and “L”, carries the Mid signal (in
MS mode) or left signal (in stereo mode).
The green connector, marked “S” and “R”, carries the Side signal
(in MS mode) or right signal (in stereo mode).
For stereo mode operation, connect the left (L) splitter connector
to the Channel 1 input and the right (R) splitter connector to the
Channel 2 input of the mixer or console. Set the Channel 1 pan pot
to full left and the Channel 2 pan pot to full right.
NOTE: Use the Shure C110 Extension Cable (available as an ac-
cesory) for extended cable runs between the VP88 and a
mixer or console.
Using an Additional Microphone
A second (mono) microphone can be used for interviewing or
close miking. Turn its channel pan pot to the center position and
set its level independently.
Monitoring
To check the balance for the mono listener, monitor sound in
mono mode as well as stereo. Since the side signal is cancelled in
mono, the mono output will be equal to the cardioid Mid cartridge
signal only, regardless of the side level control setting.
Minimizing Wind and Breath Noise
The integrated pop filter provides reduction of breath and wind
sound. Use the removable foam windscreen for high intensity wind
and speaking conditions.
LOW-FREQUENCY ROLLOFF
A low-frequency rolloff (12 dB per octave cut below 80 Hz) rolloff
can be useful in reducing pickup of low-frequency noise and vibra-
tion. Set the upper control switch on the VP88 to either of the two
low-frequency rolloff positions, depending on whether phantom or
battery power is being used. See Figure 2.
ROLLOFF SELECTION SWITCH
FIGURE 2
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OUTPUT MODE
The lower control sets the VP88 to either MS Mode, or one of
three Stereo modes. (L, M, or H). See Figure 3.
OUTPUT MODE SELECTION SWITCH
FIGURE 3
Stereo Output Mode
In Stereo Mode, the VP88 uses its internal matrix to mix the Mid
and Side signals and provide Left and Right stereo outputs. The
three settings (H, M, and L), determine the strength or width of the
stereo effect, as described below. Nominal Left and Right pickup
patterns are shown in the following series.
NOTE: The mono sum (Left + Right) in any Stereo position is al-
ways equal to the Mid signal, ensuring mono compatibil-
ity.
L (Low): Figure 4. Side level 6.0 dB lower than Mid level. The
stereo image spread of the stereo images is small. Use this setting
for distant miking, or in situations where the microphone direction-
ality cannot be well controlled, such as hand-held use. In the L
position, the microphone also picks up the least amount of ambient
sound from the side, and can be used to reduce high ambient noise
or reverberation. The L setting can be useful if the area being
miked is already very wide. However, the degree of stereo effect
may be compromised in narrow performing areas.
M (Medium): Figure 5. Side level is 1.9 dB lower than Mid level.
The increased side ambience pickup and stereo spread make the
M setting ideal for most applications.
H (High): Figure 6. Side level is1.6 dB higher than Mid level. The
H position provides the most side ambience pickup and the
greatest amount of stereo spread. This setting is only appropriate
if a high degree of ambience pickup is acceptable and the perform-
ing area is not excessively wide.
MS Output Mode. Figure 7. In MS mode, the VP88's internal
stereo matrix is bypassed. The signal from the mid cartridge is sent
to the red connector on the Y-splitter cable (M) and the side
cartridge output is sent to the green connector (S). The Side
on-axis sensitivity (90° from the front axis of the microphone) is 1.6
dB higher than the on-axis sensitivity of the Mid output. The sen-
sitivities of the Mid and Side outputs are equal at 45° off the front
axis of the microphone.
The polarity of the left lobe of the Side output matches the
polarity of the Mid output. The right lobe of the Side output is
opposite polarity.
LOW STEREO (L)
FIGURE 4
MEDIUM STEREO (M)
FIGURE 5
HIGH STEREO (H)
FIGURE 6
MS OUTPUT MODE
FIGURE 7
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Produktspecifikationer

Varumärke: Shure
Kategori: mikrofon
Modell: VP88

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