Shure manual Internal Switches and Controls, Powering the FP33 Mixer, Battery Life

ENGLISH				ENGLISH
INTERNAL SWITCHES AND CONTROLS (Cont.)
Note: Bold type indicates the Factory setting.
	DIP SWITCH	POSITION	FUNCTION
1	LIM LINK	ON	Left and Right limiters act in tandem. If limiter thresholds are set differently, limiter action
			is determined by the lower threshold setting.
		OFF	Left and Right limiters act independently.
2	LIM RELEASE R	SHORT	Right limiter release time constant is 0.1 second. Use for speech.
		LONG	Right limiter release time constant is 1 second. Use for music.
3	LIM RELEASE L	SHORT	Left limiter release time constant is 0.1 second. Use for speech.
		LONG	Left limiter release time constant is 1 second. Use for music.
4	MON DEFEAT R	OFF	When front panel Monitor switch is activated, Monitor In signal is heard in Right head-
			phone.
		ON	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	When front panel Monitor switch is activated, Monitor In signal is heard in Left headphone.
		ON	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	Inserts slate tone and slate microphone into circuit before the Master gain control (pre–
			master). Slate level is controlled by Master.
		OFF	Removes slate tone/slate microphone from pre-master cIrcuit.
7	POST-MAST SLATE	ON	Inserts slate tone and slate microphone into FP33 circuit after the Master gain control
			(post-master). Slate level not is controlled by Master.
		OFF	Removes slate tone and slate microphone from FP33 post-master circuit.
8	SLATE TONE	ON	Slate tone (400 Hz) sounds for one second when front panel slate button is pushed. Slate
			microphone also activates.
		OFF	Slate tone does not sound when slate button is pushed. Slate microphone does activate.
9	METER LAMP	TOGGLED	Lamp turns on/off when front panel lamp switch is toggled. Automatic timed turnoff of lamp
			will not occur.
		TIMED	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	Input LEDs illuminate green to indicate signal presence and relative level.
		OFF	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	Provides 12 Vdc phantom power if selected for channel input.
		48V	Provides 48 Vdc phantom power if selected for channel input.
12	MS MATRIX FOR	ON	Inserts MS decoding matrix into headphone circuit. User can monitor in stereo while allow-
	HEADPHONES		ing separate Mic and Side signals to pass through the FP33.
		OFF	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 ΠA 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 : 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	Battery
	Current	Life
	(mA)	(hours)*
(A) Idle, no signal	41	9
(B) As in (A) with +4 dBm continuous	46	7.8
output
(C) As in (B) with three Shure SM81 mi-	50	7.5
crophones at 12 V phantom power
(D) As in (B) with three Shure SM81 mi-	57	6.0
crophones at 48 V phantom power
(E) As in (B) with 63 : headphones	50	6.9
driven moderately loud (Sony MDRV6)
(F) As in (B) with meter illumination	63	5.5
continuously on

*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.

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