Shure FP33 - Manual (Page 8)

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6
INTERNAL SWITCHES AND CONTROLS (Cont.)
Note: Bold type indicates the Factory setting.
DIP SWITCH POSITION FUNCTION
1 LIM LINK ON
OFF
Left and Right limiters act in tandem. If limiter thresholds are set differently, limiter action
is determined by the lower threshold setting.
Left and Right limiters act independently.
2 LIM RELEASE R SHORT
LONG
Right limiter release time constant is 0.1 second. Use for speech.
Right limiter release time constant is 1 second. Use for music.
3 LIM RELEASE L SHORT
LONG
Left limiter release time constant is 0.1 second. Use for speech.
Left limiter release time constant is 1 second. Use for music.
4 MON DEFEAT R OFF
ON
When front panel Monitor switch is activated, Monitor In signal is heard in Right head-
phone.
When front panel Monitor switch is activated, Monitor In signal is not heard in Right head-
phone. Mixer audio remains in Right headphone.
5 MON DEFEAT L OFF
ON
When front panel Monitor switch is activated, Monitor In signal is heard in Left headphone.
When front panel Monitor switch is activated , Monitor In signal is not heard in Left head-
phone. Mixer audio remains in Left headphone.
6 PRE-MAST SLATE ON
OFF
Inserts slate tone and slate microphone into circuit before the Master gain control (pre–
master). Slate level is controlled by Master.
Removes slate tone/slate microphone from pre-master cIrcuit.
7 POST-MAST SLATE ON
OFF
Inserts slate tone and slate microphone into FP33 circuit after the Master gain control
(post-master). Slate level not is controlled by Master.
Removes slate tone and slate microphone from FP33 post-master circuit.
8 SLATE TONE ON
OFF
Slate tone (400 Hz) sounds for one second when front panel slate button is pushed. Slate
microphone also activates.
Slate tone does not sound when slate button is pushed. Slate microphone does activate.
9 METER LAMP TOGGLED
TIMED
Lamp turns on/off when front panel lamp switch is toggled. Automatic timed turnoff of lamp
will not
occur.
Lamp turns on/off when front panel lamp switch is activated. If not manually switched off,
lamp will automatically turn off after 10 seconds to conserve battery life.
10 PRESENCE LEDs ON
OFF
Input LEDs illuminate green to indicate signal presence and relative level.
Input LEDs do not illuminate green. Input LEDs will still illuminate red to indicate 6 dB be-
fore clipping.
11 12 V OR 48 V PHANTOM 12V
48V
Provides 12 Vdc phantom power if selected for channel input.
Provides 48 Vdc phantom power if selected for channel input.
12 MS MATRIX FOR
HEADPHONES ON
OFF
Inserts MS decoding matrix into headphone circuit. User can monitor in stereo while allow-
ing separate Mic and Side signals to pass through the FP33.
Removes MS decoding matrix from headphone circuit.
POWERING THE FP33 MIXER
The FP33 can be powered by a 12–30 Vdc external power
supply while preserving the life of the internal batteries.
External Power Supplied Internal Batteries
11.4 Vdc to 30 Vdc OFF (200 µ A current at 18 V)
<11.4 Vdc ON (Full power for the FP33 is sup-
plied by the higher voltage source)
BATTERY LIFE
The FP33 is designed for low current consumption.
Under typical conditions (+4 dBm into 600
Ω
in continuous
use and no phantom–powered microphones, meter illu-
mination, or headphones in use), and with two fresh 9 volt
alkaline batteries , the FP33 will operate for about eight
hours before the Power LED flashes. At this point, about 30
minutes of battery life remain. If more mixer features are
used, battery life will decrease accordingly (see table).
Mixer Operation Battery
Current
(mA)
Battery
Life
(hours)*
(A) Idle, no signal 41 9
(B) As in (A) with +4 dBm continuous
output 46 7.8
(C) As in (B) with three Shure SM81 mi-
crophones at 12 V phantom power 50 7.5
(D) As in (B) with three Shure SM81 mi-
crophones at 48 V phantom power 57 6.0
(E) As in (B) with 63
Ω
headphones
driven moderately loud (Sony MDRV6)
50 6.9
(F) As in (B) with meter illumination
continuously on 63 5.5
*Until Power LED begins to flash, and allowing 30 minutes to replace
batteries.
Note: Momentary use of headphones or meter illumina-
tion will not appreciably affect battery life.