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Extracted text from shure fp31 owners manual (Ocr-read)
Page 1
SPECIFICATIONS Frequency Response 30 Hz to 20 kHz
+2 dB
Distortion Less than
0.25O/0 total harmonic distortion at +4
dBm, 50 Hz to 20 kHz
Noise Less than
- 129 dBV equivalent input noise
Common Mode Rejection
65 dB minimum at 100 Hz, -30
dBV input
Inputs
Line IMPEDANCE
19 to 6003*
Less than 10 k3 66 k3
lnput Clipping
Level
-47 to -17 dBV
(4.5 to 141 mV)
+3 to +33 dBV
(1.4 to 44V) i
'Including simplex or A-B powered, and dynamic or ribbon microphones
Tone Oscillator
1 kHz nominal at
+4 dBm, Master at approx. 7
Slate Tone
400 Hz, 1
sec, each time button is depressed
Slate Microphone
Electret condenser, omnidirectional, with AGC, ac-
tivated while slate button is depressed
Mic
Line
Tape Phone
Outputs
Any low-Z mic
input
6003
IMPEDANCE
For Use With 1 Actual
18 k0 or greater Output Clipping
Level
high level input
83 to 2 k3
- 34 dBV (20 mV)
minimum into 1503
+ 18 dBm minimum
into
6003
-6
dBV (0.5V RMS)
into
47 k3
+4 dBV (1.6V RMS
Max)
into
2003
Phase 3-pin lnput
& Output connectors in phase; pin 3 in
phase with tip of phone
& mini jacks
Gain (at 1
kHz)
INPUT OUTPUT
Line
Line
-10 dB 40 dB
Controls
CHANNEL GAIN: Active, feedback type, individual
for each input; Channel 1 control pulls out to activate
tone oscillator
MASTER GAIN: Controls LinelMic and Tape out-
puts, and tone oscillator and slate levels
LOW-CUT FILTERS: 7 dB
rolloff at 100 Hz, -6
dBloctave slope
PHONES LEVEL: Controls both headphone outputs
LIMITER: Controls LinelMic and Tape outputs;
+ 14
dBm factory-set threshold, internally screwdriver ad-
justable down to
+ 3 dBm; 3 msec attack, 500 msec
recovery time typical
SIMPLEXIDYNAMICIA-B SELECTORS: Individual
for each input, supplies 11 to 18 Vdc Simplex (phan-
tom) or 9 Vdc A-B power with lnput in MIC position;
supplies no power with Selector in DYN position (for
dynamic or ribbon microphones) or with lnput in
LINE
position
Control Interaction Less than 1 dB with any control combination
Output Isolation
Shorting one output shall cause no more than 8 dB
level drop at 1 kHz at other output
Overload and Shorting Protection
Shorting outputs, even for prolonged periods, shall
cause no damage. Microphone inputs will not be
damaged by signals up to 3 volts.
Indicators POWER ON: Green LED flashes at approximately
I-second repetition rate as long as power switch is
on
PEAKIOVERLOAD: Limiter IN
- Red LED flashes to
indicate onset of limiting; Limiter OUT-flashes 6 dB
below output clipping level
BATTERY CHECK: Converts VU Meter to battery
condition or circuit voltage indicator;
0 VU or higher
indicates good batteries or adequate (11 to 18 Vdc)
external power source
VU METER: Factory-set at
0 VU = +4 dBm; 0 VU
level internally screwdriver adjustable
VU LAMP: Illuminates meter while button is
depressed; automatic shufoff 5 seconds after
release
Power MIXER AND SIMPLEX (PHANTOM) POWER:
SUP-
plied by two internal 9V standard alkaline batteries
(Duracell
MN1604 or equivalent) or external 11 to 18
Vdc supply;
&hour battery life under normal opera-
tion
SIMPLEX POWER:
11 to 18 Vdc nominal through
6200
A-B POWER: Supplied by additional 9V standard
alkaline battery
Connectors
LlNElMlC INPUTS AND OUTPUTS: 3-pin XLR type
TAPE OUT: 3.5 mm mini jack
PHONES: Stereo jacks; one standard
%-inch
phone and one 3.5 mm mini
12 VDC EXTERNAL POWER: Single-pin dc power
jack
Temperature Range OPERATING:
- 18 to + 57OC (0 to 135OF)
STORAGE: -29 to +7I0C (-20 to + 160°F)
Dimensions
48.3 mm
H x 160 mm W x 135 mm D (1-718 x 6-5116 x
5-5116 in.)
Net Weight (less batteries)
1 kg (2.2 Ib)
Supplied Accessories
Removable shoulder strap, carrying case
Page 2
OPERATION
LineIMic Inputs and Outputs
XLR-type 3-pin connectors, transformer-coupled ba-
lanced-line circuits; pins
2 and 3 are signal conductors;
pin 1 is ground. All XLR connectors are in phase with
one another.
Lo-Cut Filters
Activated by Inlout switch above each Channel Gain
Control to provide low-frequency
rolloff as shown in
Figure 1. Reduce undesirable low-frequency signals
such as wind noise.
FREQUENCY IN Hz
LO-CUT FILTER ACTION
FIGURE 1
Channel Gain Controls
Determine preamplifier gain and provide preamplifier
output attenuation. As gain is reduced, input clipping
level increases for channel. Optimum signal-to-noise
ratio occurs with Channel controlsset as high as possi-
ble (consistent with maintaining adequate control
range and input clipping level).
Tone Oscillator
Activated by pulling out Channel 1 control knob; stable
1 kHz oscillator; level determined by Master gain con-
trol. Oscillator signal appears at all outputs. When not
in use, Channel
1 control knob should be pushed in.
Slate
Depressing Slate button activates 1 -second 400 Hz
tone and turns on Slate Microphone. Omnidirectional
electret Slate Microphone remains on while button is
depressed, can be used to identify recorded segments
or as emergency field microphone. Slate Tone and
AGC'd microphone audio levels are controlled by Mas-
ter Gain Control.
Master Gain Control
Determines output levels at LineJMic and Tape out-
puts. Also sets Tone Oscillator level when Channel
1
knob is pulled out, and Slate-tone and -microphone
level when Slate button is pushed.
Headphone Jacks
Two stereo phone jacks: one mini 3.5 mm (front panel)
and one 114-inch phone (side panel). Combined out-
put, including Tone Oscillator, Slate Tone and Slate Mi-
crophone, appears at headphone jacks. Can be used
to drive up to four headphones or Aux-level recorder
or amplifier inputs. To wire either connector for two out-
puts, connect one conductor to tip; connect other con-
ductor to ring; and connect
shield(s) to sleeve of appro-
priate mating stereo plug. Tip and ring of headphone jacks
in-phase with pin 3 of XLR
LineJMicinput andout-
put connectors.
Phones Control
Sets output level at headphone jacks.
Limiter
Limiter Inlout switch turns on fast-acting, peak-res-
ponding limiter circuit to cut overload distortion during
loud program intervals without affecting normal pro-
gram levels. Limiter switch In (operating) restricts
maximum mixer output to approximately +14
dBm. In-
creasing individual Channel or Master gain controls in-
creases both average output and amount of limiting. To
change Limiter threshold, see section on Limiter
Threshold Adjustment.
Peak LED
Indicates Limiter operation with Limiter switch In. With
switch Out, flashes at 6dB below output clipping. Peak
indicator responds much faster than meter, activated
by even shortest transient peak, yet remains lit long
enough to provide easy recognition.
VU Meter
Factory calibrated for +4 dBm = 0 VU with 600-ohm
load at Line output. (Microphone output levels are 50
dB below Line output.) Supplied
0 VU level is recom-
mended for normal use to provide approximately
14dB
headroom between operating level and clipping level.
To change
0 VU level, see section on VU Meter Adjust-
ment.
VU Lamp
Illuminates meter while button is depressed; automati-
cally turns off 5 seconds after release to prevent bat-
tery drain.
Tape Outputs
3.5 mm jack to feed unbalanced Aux-level input of tape
recorder or amplifier. Tip of connector in phase with pin
3 of XLR connectors.
Telephone Lines
In Line position, output transformer will operate with
dc-biased "dialed up" telephone lines although there
may be slight increase in distortion. When connecting
FP31 to telephone line, use FCC-Registered* inter-
face adapter between mixer and telephone line.
'DOC-Certified in Canada
Condenser Microphone Power
Condenser microphones, either 12 to 18 Vdc phantom
(simplex) powered or 9 Vdc
A-B(T) powered, can be
supplied from any Mic input of
FP31. Below batteries,
inside battery compartment, are three 3-position
switches. Center position is for dynamic microphones
(no dc power supplied to Mic input); left position is for
9-Vdc A-B power, right position is for 11
- to 18-Vdc
phantom power.
NOTE: No power is supplied to any input with
LineJMic
switch in Line position. No A-B power is supplied un-
less right-side battery is present.
Mixer Powering
In ordinary portable use, the FP31 is powered by two
standard 9-Vdc alkaline batteries installed in
leftmost