Iso-Tech SLM 52N - Typical Frequency Response Due to Case Reflections at 0° Incidence; Typical Frequency Response of 65 mm Windscreen at 0° Incidence

EN-17
14. TYPICAL FREQUENCY RESPONSE DUE TO CASE REFLECTIONS AT 0°
INCIDENCE
Freq
units
31.5
Hz
63
Hz
80
Hz
100
Hz
125
Hz
160
Hz
200
Hz
250
Hz
315
Hz
400
Hz
500
Hz
630
Hz
Case
Reflections
in dB
-0.1 0.0 0.0 +0.1 +0.2 0.0 0.0 0.0 -0.3 -0.2 0.1 0.1
Freq
units
800
Hz
1000
Hz
1250
Hz
1600
Hz
2000
Hz
2500
Hz
3150
Hz
4000
Hz
5000
Hz
6300
Hz
8000
Hz
Case
Reflections
in dB
+0.1 0.0 -0.2 0.0 0.4 0.3 0.4 0.3 -0.3 +0.6 +0.6
Absolute effect at 1000Hz = 0.0 dB
Case reflections for an ISO-TECH 52N meter fitted with an MC-21 microphone as
per IEC 61672-1 and IEC 60651, relative to 1000Hz.
15. TYPICAL FREQUENCY RESPONSE OF 65mm WINDSCREEN AT 0°
INCIDENCE
Freq
units
31.5
Hz
63
Hz
80
Hz
100
Hz
125
Hz
160
Hz
200
Hz
250
Hz
315
Hz
400
Hz
500
Hz
630
Hz
Windshield
Effects
in dB
-0.2 -0.2 -0.1 -0.1 -0.2 -0.2 -0.2 -0.2 -0.1 -0.2 -0.1 -0.1
Freq
units
800
Hz
1000
Hz
1250
Hz
1600
Hz
2000
Hz
2500
Hz
3150
Hz
4000
Hz
5000
Hz
6300
Hz
8000
Hz
Windshield
Effects
in dB
-0.1 0.0 0.1 0.1 0.1 0.4 0.5 0.4 0.4 0.6 0.4
Absolute effect at 1000Hz = +0.2 dB
Frequency response effects for a 65mm dia. windshield fitted with an MC-21
microphone as per IEC 61672-1 and IEC 60651, relative to 1000Hz.