Microphone; Random Incidence And Free-Field Correction - SINUS Tango Plus User Manual

4.5 Microphone

Only the original microphone capsule MK255 by MICROTECH GEFELL is approved for measurements with
Tango_Plus. The directional characteristics of the microphone correspond to the limits specified in IEC
61672-1:2003. The effect of the windscreen on the directional characteristics of the microphone is negligible.
As a result all corresponding correction values are specified with
microphone reference point are located at the middle of the microphone membrane.
Property
Model Transducer type
Polarization
Frequency range free-field
Sensitivity
Max. SPL for 3 % , distortion at 1 kHz
Self-generated noise with preamplifier
Capacitance
Operating temperature range
Ambient temperature coefficient
Ambient pressure coefficient
Diameter
with protection lid
without protection lid
Length
Weight
Thread for preamplifier
Thread for protection
Table 4.6: Technical data MK255
4.5.1 Random incidence and free-field correction
Freifeldkorr. Diffusfeldkorr.
in Hz in dB in dB
25 0
31.5 0
40 0
50 0
63 0
80 0
100 0
125 0
160 0
200 0
250 0
315 0
400 0
500 0
630 0
Table 4.7: Free-field and random incidence corrections
SINUS Messtechnik GmbH
4.5 Microphone
Capacitive pressure transducer
3.5 Hz . . . 20 kHz ( 2 dB)
-50 . . . +100 C
13,2
12,7
11,7 mm 60 UNS
12,7 mm 60 UNS
Freifeldkorr. Diffusfeldkorr.
in Hz in dB
0 0.8 k 0
0 1 k 0
0 1.25 k -0.03
0 1.6 k 0.03
0 2 k 0.21
0 2.5 k 0.36
0 3.2 k 0.56
0 4 k 0.88
0 5 k 1.36
0 6.3 k 2.01
0 8 k 2.99
0 10 k 4.25
0 12.5 k 6.14
0 16 k 8.77
0 20 k 9.9
(manufacturer's specification: measurement uncertainty at 95% certainty
0 1
Value
backelectret
ca. 50 mV/Pa
146 dB
15 dBA
17 pF
0 01
dB/ C
-0.01 dB/kPa
1/2"
0,02 mm
0,02 mm
16,4 mm
7,5 g
in dB
0
0
0
0
-0.1
-0.1
0
0.1
0.2
0.4
0.7
0.9
1.8
3.4
3.2
25 of 30
dB. The acoustic center point and
Manual Tango_Plus
0.6 dB)