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USES:
• Testing the frequency
response, harmonic
distortion and
i ntermodu lation distortion
of hearing aids using the
Anechoic Test Chamber
Type 4222
• Measurement of
loudspeaker characteristics
• Measurement of the sound
insulation of hearing
protectors
• Comparison
measurements on bone
vibrators using Artificial
Mastoid Type 4930
• Measurements on
microphones
• Reflection Measurements
in Anechoic Chambers on
.
~oudspeaker
enclosures,
Artificial Heads etc.
• Measurements on
telephone earpieces using
Artificial Ears Types 4152
or 4153
FEATURES:
• Three instruments, Signal
Generator, Response
Analyzer and Chart
Recorder combined in one
desk-top unit
Introduction
The'•Type 211 6 Audio Test Sta-
tion is a highly versatile, three-in-
one instrument designed with spe-
cial emphasis on simplicity of opera-
tion and clear presentation of re-
sults. The single desk-top unit is a
careful integration of three separate
sections; a signal generator which
supplies a sinusoidal test signal to
an external device e.g
.
loudspeaker
19-321
~!
. .
•
m
•
••
•
•
::
-
'
. .
.
• Automatic regulation of
output signal level directly
from a stored correction
curve
• Wide frequency range
from 1 00 Hz to 10kHz in
256 logarithmically spaced
discrete steps
• Output level adjustable
over 40 dB range in 5 dB
steps
• Measures both
lntermodulation and
Harmonic Distortion
• Full digital control
or exciter; an analyzer which can
measure harmonic and intermodula-
tion distortion as well as frequency
response, and a pen recorder for
permanently
documenting
the
re-
sults.
A built-in digital memory, a spe-
cial feature of the instrument, en-
ables a correction curve for the out-
put signal to be pre-stored. Subse-
quent measurements can then be
type 211 6
Audio Test Station
·~
·
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il •
~-~'
• Direct connection of either
1 inch or 1/2 inch
microphones
• Test settings automatically
indicated on test chart
• Measurements recorded
on preprinted pre-punched
chart for immediate
documentation
• In accordance with IEC
118 and ANSI
S3.22-1976
• Easy to operate
• Easily exchanged fibre
pens available in three
colours
carried out with the excitation level
held constant throughout the fre-
quency range independently of the
excitation
source
characteristics.
This greatly eases interpretation of
results and enables comparisons to
be made from a common reference
.
Previous methods of output level
regulation often consisted of a feed-
back loop
incorporating a supple-
mentary transducer and amplifier as
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