Georg Neumann GmbH, Berlin • Ollenhauerstr. 98 • 13403 Berlin • Germany • Tel.: +49 (30) 417724-0 • Fax: +49 (30) 417724-50
E-Mail: [email protected], [email protected], [email protected] • Website: www.neumann.com
Errors excepted, subject to changes • Printed in Germany • Publ. 10/00 10394 80101/A02
Cat.-No. 10394 001
The PA 100 Pistonphone Adapter enables a pistonphone for 1" test
microphones (e.g. Bruel & Kjaer type 4230 or type 4228) to be attached to
one of the auditory canal stubs of the KU 100 dummy head. This makes it
possible to calibrate each ear system individually, see also chapters 6 and
8 of the KU 100 operating instructions.
For the precise coupling of the pistonphone adapter to the auditory canal it
is necessary to push it on to the relevant stub of the ear system all the way
up to the stop. For this purpose the head must be opened, see chapter 2.3
of the operating instructions. The complete ear system can then be lifted
out and the outer ears can be detached, see chapter 7 of the operating
instructions.
The interpolation of the PA 100 between the pistonphone and the ear
system of the dummy head results in an insertion loss of 1.7 dB.
Example: The B & K Pistonphone 4230 is attached with the aid of
the 1/2" reducer (supplied with the 4230) and the PA 100
adapter to an ear canal stub. The B & K reducer reduces the
sound pressure of the pistonphone from 1 Pa to 0.98 Pa,
corresponding to a correction factor of 1.02. This sound pressure
is attenuated by 1.7 dB by the PA 100 adapter, corresponding to
a correction factor of 1.22.
Say the reading at the dummy head output is 17.5 mV; then the
true free-field sensitivity for this ear system amounts to
1.02 • 1.22 • 17.5 mV/Pa = 21.8 mV/Pa.
PA 100 Pistonphone Adapter
10394_80101_A02_PA100.p65
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