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CERTIFICATE OF CALIBRATION
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FOR BRÜEL & KJÆR SOUND INTENSITY MICROPHONE
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The calibration is performed
by comparison with Microphone
Cartridge Type 4181
Calibration Service Standard
Microphone Cartridge Type Part # 1 Id No.
N/A Serial No. 1480271
4160 Serial No. 991820
Open Circuit Sensitivity
Calibrated by TS
(BRÜEL & KJÆR) Date
14 AUG 2000 at 1013 mbar, 23
o
C, 65% R.H.: -38.98 dB re. 1 V/Pa
Due
14 AUG 2001
or
11.25 mV/Pa
a) Estimated uncertainty of
comparison: This calibration is
traceable to:
+ 0.09
dB at 99% confidence level. NIST Test # 822/261669-99
b) Estimated uncertainty of
Calibration Service
Standard Microphone
Cartridge: Open Circuit
Correction Factor K0 = +13.0 dB
+ 0.06
dB at 99% confidence level. Correction
Factor K = dB
c) Absolute uncertainty: with
Preamplifier Type:
Sq. Root (a2+b2) = 0.11
dB at 99% confidence level. Serial No.:
The lower curve is the pressure response recorded Condition
of Test:
with Electrostatic Actuator
Type : UA 0033 Ambient Pressure: 988.71 hPa
The Free-Field Frequency
Response Curve (0o) (if Temperature: 23 oC
shown) is obtained by applying
the corrections, found Relative Humidity: 38 %
on the supplied chart, to the
measured actuator Polarization voltage: 200 V
response curve. Frequency: 250 Hz
The Random Incidence
Frequency Response Curve Date of calibration: 08 MAY 2001
(if shown) is obtained by
applying the corrections, Re-calibration due: 08 MAY 2002
found on the supplied chart to
the measured actuator
Note: The calibration data is both “AS FOUND” and “AS FINAL”
response curve. Certificate
# OM20010508 PO# 20010508
ODIN METROLOGY,
INC. For: Odin
Metrology, Inc., Thousand Oaks, CA 91320
CALIBRATION OF BRÜEL & KJÆR INSTRUMENTS
Note: At the time
of calibration this microphone was
3533 Old Conejo Road Suite 125
performing within Mfg.
specification.
Thousand Oaks, CA 91320
Calibration performed by:
Tel. (805) 375-0830 Fax (805) 375-0405
Torben Ehlert, Quality Assurance Manager
Note: This calibration report shall not be reproduced, except
in full, without written consent by Odin Metrology, Inc. Page
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