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2.
Control Knobs, Terminals etc.
: - - - - -}--Power Supply Connector
•
:
Power
Supply
for 2203
Range Switch 1
(block knob,
i
~
~·
~<>
!J
ottenuotor)
Range Switch 2
(transparent knob,
output ottenuator)
Meter Range
(Red Circle)
~::~
p~~
!J
···.~
___l,--;~t:ent
Adjustment
t't'
(ic:q,
'
/"
t
)
l~
.
:
(15 frequencies)
aiso
;coo
~
c..,.,.,.,...,,.
Sensitivity
Adjustment
Meter Light
(not used)
Power Indicator
Power Switch
Output Socket
Pilot Lamp
Function Selector
and Power
Switch
Fig.
2.1. The
Hearing
Aid
Test Box
Type 4217.
Schematic view.
(Refer Fig.
2.1).
Hear-ing Aid Test Box.
t\ttenuator,
Power Switch:
Power Indicator:
Frequency Selector:
18
For
selection
of the
sound pressure level
(SPL)
in
the test
enclosure,
50-90 dB
SPL in
5 dB
steps.
In position ·'Off" the line
voltage
is
switched
off.
Red light
indicating
that
power is on.
For selection of the test frequency in the range
200-5ooo
Hz in 1/3 octave
steps.
The
available
frequencies
are 200-250-315-40(}--500-630-800
'
'
'
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