6.5. Startup and shutdown
of delegate unit
To startup the delegate units simply press shortly on
the microphone button.
To shutdown the delegate units , press on the
microphone button for 3 sec.
For delegate units with double microphone buttons ,
switch off/on is done with the right handside
microphone button
7. Microphones
7.1. Introduction
The Confidea-MIC38SL (38 cm) pluggable microphone
is used with the different delegate- and chairman
units. This microphone ha a uni-directional response
for optimum performance even in noisy conditions,
and has a very low susceptibility to RF-interference
from mobile phones.
7.2. Electrical and
acoustic properties
Table 7.1: Microphone characteristics
Transducer type Back electret (condenser)
Operating principle Pressure gradient
Polar pattern
Uni-directional,
cardioïd
Frequency response 50 Hz – 16000 Hz
Nominal impedance
1kOhm
(at 1 kHz, drop resistance =
1k2, Vdd = 3.3VDC )
Load impedance > 5kOhm
Max.SPL at 1 kHz 120 dB SPL
Equivalent sound
pressure level
< 25 dB(A)
Free field sensitivity
7mV/Pa, +/- 3 dB at 1 kHz or
(-43dB, 0dB=1V/Pa at 1kHz)
Power supply 3.3V DC, 0.5 mA
Consumption
0.5 mA
(without LED ring);
max. 25 mA
(with illuminated ring)
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