How to set up audiometer calibration equipment at FBE.
These notes show how to use a sound level meter as the measuring
device for an Artificial Ear and an Artificial Mastoid. They demonstrate
the methods of developing and using audiometer calibration levels
with the Sound Level Meter (SLM) by applying an understanding of
the calibration equipment and the reference basis for the dB scales
of Voltage, Force and Sound Pressure used by these devices at FBE.
Example sets of calibration levels derived from the ISO RETSPLs
for use with an Artificial Ear, and RETFLs for an Artificial Mastoid
are Included.
After preparing the working levels, actually calibrating the Sound
Level Meter only takes a few minutes for either microphone or accelerometer
tests.
You can view each section below, or download the lot as a printer friendly pdf (1.5Mb)
| Units of Measurement | |
| Precision Sound Level Meter | |
| Calibration of the Sound Level Meter | |
| Artificial Ear and Calibration | |
| Artificial Mastoid | |
| Artificial Mastoid Calibration | |
| Derivation of Constant Dynamic Force Calibration Levels | |
|
|
Test Equipment |
Type In Use at FMC BME |
| Sound Level Meter | B&K 2203 |
| 1” Capacitive Microphone | B&K 4144 |
| Artificial Ear & 6 cc coupler | B&K 4152 |
| 2cc Coupler | B&K DB 0138 |
| Artificial Mastoid | B&K 4930 |
| Calibrator | B&K 4220 |
| Counter | TEKScope Digital sampling CRO |
Bibliography
AS/NZS 1591.1 - 1995 Reference zero for the calibration of pure tone
bone conduction audiometers (ISO 389-3 1994)
AS/NZS 1591.2 - 1987 Reference zero for the calibration of pure tone
audiometers (ISO 389)
AS/NZS 1591.4 - 1995 A mechanical coupler for calibration of bone
vibrators (IEC 373 - 1990)
AS/NZS 1591.5 - 1987 Wide - band artificial ear (ISO 389 -1975/ Ad
1 - 1983)
AS 2586 - 1983 Audiometers (IEC 645 - 1977)
AS 3657.1 - 1989 Pure tones, equal loudness contours (ISO 226 1987)
BRÜEL & KJÆR “Instructions and Applications Artificial
Ear Type 4152”. Dec 1970
BRÜEL & KJÆR “Measuring Sound Sept 1984”
BRÜEL & KJÆR “Technical Review No 2/ Bone Conduction/calibrating
problems in…” - 1970
BRÜEL & KJÆR “Instruction Manual, Artificial
Mastoid 4930” Dec. 1976
BRÜEL & KJÆR “Instruction Manual, Precision Sound
Level Meter 2203” July. 1976
BRÜEL & KJÆR “Instruction Manual, Octave Filter
Set 1613” Dec. 1976Jan 1979
BRÜEL & KJÆR “Instruction Manual, Pistonphone
4420” April 1977
BRÜEL & KJÆR http://www.bk.dk./
Baylor College of Medicine : The B.R. Alford Department of Otorhinolaryngology
& Communicative Sciences http://www.bcm.tmc.edu/oto/studs/aud.html
American Journal of Audiology Vol 7 1059-0889 Oct 1998 Paper: “A
Simplified method for calibrating a sound level meter for use with
a B&K Artificial Mastoid”
American Journal of Audiology Vol 6 No 3 1059-0889/97 1997? “ANSI
update: Specification of Audiometers”