Audiotone Model AU-1 Audiometer
The transportable Audiotone Model AU-1 audiometer was made by the
Audiotone Division of Royal Industries of Phoenix, Arizona in 1975.
It was built into it's carrying case and measured 14¼" x 9½" x 6¾"
(36 x 24 x 17 cm) and weighed 8 pounds, 4 oz. (3.750 kg).
The audiometer was in front with a storage compartment behind.
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Front view of the storage compartment, showing the nameplate of the Audiotone
Model AU-1 audiometer, as well as the earphone and power jacks.
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Close-up of the right side of the nameplate in the storage compartment
showing that the Audiotone
Model AU-1 audiometer was made by the Audiotone Division of Royal
Industries of Phoenix, Arizona.
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Close-up view of the left side of the nameplate of the Audiotone Model AU-1
audiometer showing the model number (AU-1) and serial number (AC 1011).
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View of the top (front) of the Audiotone Model AU-1 audiometer showing
all the controls.
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Close-up of the upper row of controls of the Audiotone
Model AU-1 audiometer. The output control is on the left. It sends the
sound signals to either the red (right) earphone, the blue (left)
earphone, the bone conduction transducer and also acts as the on/off
switch. The center masking control produces a masking sound of between
50 and 100 dB, or nothing (off).
The right knob is the two-position T. I. (Tone Interrupter) Reverse
control. In "Normal", there is no sound until the Interrupter switch is
pressed at which time a tone is sent to the headphones. In the "Reverse"
position, the tone is steady and the Interrupter switch creates a
temporary silent "notch". |
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Close-up of the lower left front of the Audiotone
Model AU-1 audiometer showing the "Hearing Threshold Level" knob. Sound
levels can be set between 0 and 110 dB in 5 dB increments. It is shown
set to 90 dB. The Interrupter switch is at the bottom right. It is
spring loaded and you press it down to produce the tone or notch.
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Close-up of the lower right front of the Audiotone
Model AU-1 audiometer showing the "Frequency" control. Frequencies can
be set to standard audiological test frequencies between 125 Hz and
8,000 Hz. It is shown set to 1,000 Hz.
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The back of the empty storage compartment of the Audiotone Model AU-1
audiometer showing the location of the original Calibration Certificate.
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Close-up of the original Calibration Certificate of the Audiotone Model
AU-1 audiometer showing that it was originally calibrated on November
14, 1975, presumably just before this audiometer entered service.
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Close-up of the front wall of the storage compartment of the Audiotone
Model AU-1 audiometer showing the 4 jacks there. From left to right they
are the bone conduction transducer jack, the red (right) earphone jack,
the blue (left) earphone jack and the power adapter cord jack. The first
three are labeled on the nameplate.
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Close-up of the front wall of the storage compartment of the Audiotone
Model AU-1 audiometer showing the cords plugged into the red (right)
earphone jack, the blue (left) earphone jack and the power adapter cord
jack. The bone conduction transducer is missing.
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Top view of the storage compartment of the Audiotone Model AU-1
audiometer. This compartment stored the power adapter, earphones and
bone-conduction transducer.
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Front and rear view of the earphones for the Audiotone Model AU-1
audiometer. Note the blue and red plugs on the appropriate earphones.
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Side view of the earphones for the Audiotone Model AU-1
audiometer. Note the red and blue diamonds on the side of the
appropriate earphones. The colors are a bit faded now. The headband
for the earphones is missing.
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The Audiotone Model AU-1 audiometer was powered by an 8-watt wall power
adapter.
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Bottom view of the Audiotone Model AU-1 audiometer power adapter. The output of this adapter was 35 volts DC at 100 mA.
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Front view of the Audiotone Model AU-1 audiometer with the lid in
place showing the Audiotone name and the carrying handle.
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Outside view of the Audiotone Model AU-1 audiometer with the lid in
place completing its carrying case. Note the latch at the front side.
There is also a corresponding latch on the other side.
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Close-up of the latch of the Audiotone Model AU-1 audiometer shown
here in its opened position. To open the lid, you first pushed in (back) on the end
of the latch, then swung the whole latch assembly out.
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