Shutdown And Storage; Troubleshooting - Neumann.Berlin U 87 AI Manual Del Usuario

6. Shutdown and storage
Before switching off the microphone or discon-
necting the cables, reduce the volume of con-
nected equipment.
Only then should the phantom power be switched
off.
Disconnect the cables.
When disconnecting a cable, always pull only on
the connector and not on the cable itself.

7. Troubleshooting

▶
Problem Possible causes
Microphone The phantom power supply voltage is not
not operating switched on at the mixing console or at the
power supply equipment.
The power supply equipment is not
connected to the power supply line or there
is no battery.
No signal The microphone is not connected to the
transmission correct microphone amplifier input of the
subsequent equipment.
8. Technical data and
connector assignments
Permissible atmospheric conditions: 1)
Operating temperature range ........... 0 °C ... +70 °C
Storage temperature range ...........−0 °C ... +70 °C
Humidity range ..................... 0 % ... 90 % at +0 °C
0 % ... 85 % at +60 °C
Acoustical op. principle .............Pressure gradient
Directional pattern ........... Omni/cardioid/figure-8
Frequency range ...............................0 Hz...0 kHz
Sensitivity ) ......................... 0/8/ mV/Pa ± 1 dB
Rated impedance ..................................... 00 ohms
Rated load impedance ..........................1000 ohms
Signal-to-noise ratio ,
)
CCIR 4) ................................................... 68/71/69 dB
Signal-to-noise ratio ) ,
A-weighted 4) ........................................ 79/8/80 dB
Equivalent noise level,
CCIR ....................................................6//5 dB
4)
Equivalent noise level,
A-weighted 4) ......................................15/1/14 dB-A
EN
4
Microphones which are not in use should not be
allowed to remain on the stand gathering dust.
A microphone which is unused for a prolonged pe-
riod should be stored under normal atmospheric
conditions, and should be protected from dust.
For this purpose, use a lint-free, air-permeable
dust cover or the original packaging of the micro-
phone.
▶
Solution
Check the corresponding channel settings.
Check the connection to the power supply
line or check the battery of the power supply
equipment.
Check the signal path.
If necessary, activate the appropriate input
on the corresponding channel of the mixing
console.
Max. SPL for 5)
less than 0.5 % THD (cardioid) ..................... 117 dB
with preattenuation ......................................17 dB
Max. output voltage ...................................... –6 dBu
Supply voltage ........................................ 48 V ± 4 V
6)
Current consumption 6) .................................0.8 mA
Minimum operating time
with BS 48 i ................................. approx. 0 hours
Matching connector ...................................... XLR  F
Weight ............................................................. 500 g
transducer
Diameter.........................................................56 mm
Length ......................................................... 00 mm
94 dB SPL equiv. to 1 Pa = 10 µbar
0 dB equiv. to 0 µPa
The microphone has a balanced transformer out-
put. The -pin XLR connector has the following
standard pin assignments:
Pin 1: 0 V/Ground
Pin : Modulation (+phase)
Pin : Modulation (–phase)
1) All values for non-condensing humidity. The values are
valid for clean and well-looked-after microphones or
microphone capsules, respectively. Any kind of pollution
of capsules and membranes may restrict the said values.
) at 1 kHz into 1 kohms rated load impedance.
re 94 dB SPL
)
4) according to IEC 6068-1;
CCIR-weighting acccording to CCIR 468-, quasi peak;
A-weighting according to IEC 6167-1, RMS
THD of microphone amplifier at an input voltage
5)
equivalent to the capsule output at the specified SPL.
Phantom powering (P48, IEC 6198).
6)
9. Selected Accessories*
(see photos in appendix)
Elastic Suspension
EA 87 .......................blk ...............Cat. No. 00797
Auditorium Hanger
MNV 87 ....................ni .................Cat. No. 006804
Mount
DS 10 .....................blk ...............Cat. No. 0074
SG 67 ....................ni .................Cat. No. 00614
Popscreen
PS 15 ........................blk ...............Cat. No. 00847
PS 0 a ....................blk ...............Cat. No. 008488
Windscreen
WS 87 ......................blk ...............Cat. No. 00675
Battery Supply
BS 48 i .....................blk ...............Cat No. 006494
BS 48 i- ..................blk ...............Cat. No. 006496
Power Supply
N 48 EU .................blk ...............Cat. No. 00857
N 48 US .................blk ...............Cat. No. 00858
N 48 UK .................blk ...............Cat. No. 00859
Connecting Cable
IC  mt (10 m) ..........blk ...............Cat. No. 00654
IC 4 (10 m) ...............ni .................Cat. No. 006547
IC 1 mt (5 m) ..........blk ...............Cat. No. 006570
Adapter Cable
AC  (0. m) ...............................Cat. No. 006598
AC 5 (0. m) ...............................Cat. No. 006600
AC 7 (0. m) ...............................Cat. No. 00660
Meaning of color codes:
ni = nickel, blk = black
* Detailed descriptions and additional articles can be found
in our accessories catalog or at: www.neumann.com
EN
5