BRUEL & KJAER 4226 User Manual page 38

30 Multifunction Acoustic Calibrator Type 4226 – User Manual
Obtained Doses at 1 kHz:
SPL dB
94 0.26% ±0.01%
104 2.62% ±0.20%
114 26.20% ±1.90%
AC OUTPUT
Output Voltage: 12.5 mV ±0.5 mV at settings 94 dB, 1 kHz
and pressure mode. Voltage changes according to the
selected level, type of microphone, sound field and function.
Signal for testing time weighting and crest factor capabilities
as above, except that the crest factor is 10
✐
Please note: The acoustic output is switched off when
a plug is inserted in the AC OUT socket
Output Impedance: 600 Ω, short-circuit proof
Frequency Response: ±0.2 dB from 31.5 Hz to 16 kHz in
Pressure mode
EXTERNAL GENERATOR INPUT
Input Voltage: 0.5 V – 1.5 V
Input Impedance: 47 kΩ
Frequency Response in the Coupler:
8 kHz to
31.5 Hz to <8 kHz
<12.5 kHz
±0.15 dB ±0.25 dB
✐
Please note: These tolerances are relative to the
inverse pressure response of the reference microphone
(see the user manual). Only pressure and linear response
are possible with external generator.
IEC ANSI
0.18% ±0.01%
0.73% ±0.03%
2.90% ±0.12%
12.5 kHz to
16 kHz
±0.50 dB
Standards
Type 4226 complies with:
• IEC 60942-1988 Sound Calibrators, Class 1 (at reference
sound pressure level)
• ANSI S1.40-1984, Specifications for Acoustical Calibrators
Specifications Valid for Brüel & Kjær
Microphone Types
Pressure Field: Type 4180
Equivalent 0° Free Field:
Microphone
Traditional Types
Settings
a 4129, 4130, 4176
b 4155, 4165
c 4133, 4134, 4147,
4149
For other types of microphones, see section 3.5
General Specifications
STABILISATION TIME
The LED corresponding to the selected frequency lights
continuously when the SPL is stabilised (typically 2 to 10 s)
BATTERIES
Type: 4 × 1.5 V alkaline cells IEC LR6
Life Time: 10 hours approx. at 20 °C with alkaline batteries
Battery Check: The Batt. Low LED is lit when reaching the last
10% of the battery life
EFFECTIVE COUPLER VOLUME
3
Approximately 400 cm at 31.5 Hz, decreasing to
3
approximately 30 cm at 1 kHz. Obtained by feedback
DIMENSIONS AND WEIGHT
• Length: 275 mm (10.8 in)
• Width: 230 mm (9.0 in)
• Height: 90 mm (3.5 in)
• Weight: 1.5 kg (3.3 lb)
Falcon Types
4187, 4188
4189, 4190
4191, 4192, 4193