9
- Microphone reference direction
microphone symmetry axis
- microphone reference point
microphone diaphragm centre
- reference orientation
sound wave arriving from reference
direction
- reference temperature
+23°C
- reference humidity
50% RH
- reference static pressure
101.325kPa
•
Permissible error for sinusoidal reference signal
(progressive sound wave incident perpendicularly
to microphone diaphragm, 94dB, 1000Hz)
≤
±
0.7dB
•
Operating temperature range
-10
÷
+50°C
•
Storage temperature range
-10
÷
+50 °C
•
Operating humidity range
≤
90% RH (no condensation)
•
Operating static pressure range
65
÷
108kPa
•
Electromagnetic emission
within the limits specified in
EN 61672-1:2002 (maximum
emission when operating with
external power supply)
•
Warm-up time:
- after turn-on
1 minute
- after environmental conditions change
15 minutes
•
Measurement duration
99h 59m 58s (set with 1s resolution)
or infinite
•
Serial communication interface
USB 1.1
•
Dimensions (without microphone)
237 x 84 x 50 mm
•
Power supply
- internal battery
NiMH 6V 2.1Ah
- external power supply
Mascot 5014 (9V, 350mA)
•
Minimum operating voltage of internal battery
5.5V
•
Continuous operating time (battery fully charged,
microphone heating turned off)
24h
•
Weight
600g
•
Nominal corrections for effects of reflection
from instrument case (free field, 0° incidence)
See table below
f [Hz]
250
315
400
500
630
800
1000
1250
1600
2000
2240
dL [dB]
0,23
-0,22
0,41
-0,08 -0,30
-0,29
-0,30
0,30
-0,17
-0,44
-0,11
U [dB]
≤
0,03
≤
0,05
f [Hz]
2500
2800
3150
3550
4000
4500
5000
5600
6300
7100
8000
dL [dB]
-0,09
0,12
-0,17
-0,51
0,04
0,00
-0,44 -0,29
0,19
0,16
0,51
U [dB]
≤
0,05
f [Hz]
8500
9000
9500 10000 10600 11200 11800 12500 13200 14000 15000
dL [dB]
-0,33
0,25
-0,33
-0,52
0,08
-0,18
-0,05
0,19
-0,12
-0,43
-0,53
U [dB]
≤
0,05
≤
0,09
f [Hz]
16000 17000 18000 19000 20000
dL [dB]
0,03
0,63
0,60
-0,97 -1,50
U [dB]
≤
0,09
•
Differences between WK-21 microphone free field
frequency response at 0° incidence and electrostatic