Standards Satisfied
IEC942 (1988), Sound Calibrators, Class 1
ANSI S1.40-1984 (R 1997), Specifications for Acoustic Calibrators
Specified Microphone Types:
(Conforms to IEC 942 Class 1)
Bruel & Kjaer 1" and 1/2", 1/4", 1/8" with adaptor
Nominal Sound Pressure Level:
94.0 dB ± 0.2 dB or 114.0 dB ± 0.2 dB re 20 mPa at reference conditions
Equivalent Free-field Level:
(0° incidence, re Nominal Sound Pressure Level)
-0.15 dB for 1/2" Bruel & Kjaer Microphones
Equivalent Random Incidence Level:
(re Nominal Sound Pressure Level)
+0.0 dB for 1", 1/2", 1/4" and 1/8" Bruel & Kjaer Microphones
Reference Conditions:
Ambient Temperature: 20 °C (68 °F)
Ambient Pressure: 1013 hPa
Ambient Humidity: 65 %RH
Load: Microphone Type 4134 (0.25 cm3)
Ambient Conditions:
Temperature: -10 ° to +50 °C (14 ° to 122 °F)
Pressure: 650 to 1080 hPa
Humidity: 10 to 90 %RH (without condensation)
Effective Load Volume: 0 to 1.5 cm3
Influence Of Ambient Conditions: (typical)
Temperature Coefficient: ± 0.0015 dB/°C
Pressure Coefficient: +8.10 -5 dB/hPa
Humidity Coefficient: 0.001 dB/%RH
Level Stability:
Short Term: Better than 0.02 dB (as specified in IEC 942)
One Year: Better than 0.05 dB (õ=96%)
Stabilisation Time: 5.0 s
Nominal Effective Coupler Volume: >200 cm3 at reference conditions
Frequency: 1 kHz ± 0.1 %
Total Harmonic Distortion (THD): <1 %
Storage Temperature Range: -25°C to 70 °C (-13°F to 158 °F)
Protection Class: (with leather protection case) IP50 (IEC 529)
Batteries:
Type: 2 x 1.5 V IEC Type LR6 ("AA" size)
Lifetime: Typically 200 hours continuous operation with alkaline batteries at 20 °C (68 °F)
Check: When Type 4231 stops working continuously and only operates when holding in the button, the batteries should be replaced.
Dimensions (Without Case):
Height: 40 mm (1.5")
Width: 72 mm (2.8")
Depth: 72 mm (2.8")
Weight: 150 g (0.33 lb.) (including batteries)
| E&OE - specifications subject to change without notice. |