Welch Allyn GSI 38 User manual

WARRANTY
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We, Grason-Stadler, Inc. warrant that this product is free from defects in material and
workmanship and, when properly installed and used, will perform in accordance with
applicable specifications.
If within one year after original shipment it is found not to
meet this standard, it will be repaired, or at our option, replaced at no charge except
for transportation costs, when returned to an authorized Grason-Stadler service facility.
If field service is requested, there will be no charge for labor or material; however, there
will be a charge for travel expense at the service center’s current rate.
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NOTE
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Changes in the product not approved in writing by
Grason-Stadler shall void this warranty. Grason-Stadler
shall not be liable for any indirect, special or
consequential damages, even if notice has been given
in advance of the possibility of such damages.
THIS WARRANTY IS IN LIEU OF ANY OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO, ANY IMPLIED WARRANTY OF
MERCHANTABILITY OF FITNESS FOR A PARTICULAR
PURPOSE.
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WARNING
The GSI 38 is designed to be used with a hospital grade outlet. Injury to personnel or
damage to equipment can result when a three-prong to two-prong adapter is connected
between the GSI 38 power plug and an AC outlet or extension cord. Additionally, those
GSI 38 Auto Tymps that are equipped with power transformers, use a specific
transformer (8000-0260, 800-0261, or 8000-0262) which should not be interchanged
with any other transformer or supply.
The GSI 38 is a specifically calibrated device and the periodic service and adjustments
which the instrument may require should be done only by an authorized Grason-Stadler
service technician.
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PRODUCT SPECIFICATION
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GSI 38 PRODUCT SPECIFICATIONS (RI)
CATALOG LISTINGS
1738-9700
1738-9705
1738-9706
1738-9708
GSI 38 Auto Tymp, Vl, USA Tymp + lpsi Reflex
GSI38
Auto Tymp,
Vl, Export
GSI 38 Auto Tymp, Vi, Export, 100V
GSI
38 Auto Tymp,
V1,, Export, 240V
1738-9710
GSI 38 Auto Tymp, V2,
USA
Tymp + lpsi/Contra Reflex
1738-9715
GSI38
Auto Tymp,
V2, Export
1738-9716
GSI 38 Auto Tymp, V2, Export, 100V
1738-9716
GSI 38 Auto Tymp, V2, Export, 240V
1738-9720
GSI 38 Auto Tymp, V3, USA Tymp
+Ipsi/Contra + Aud.
1738-9725
GSI38
Auto Tymp,
V3, Export
1738-9726
GSI 38 Auto Tymp, V3, Export, 100V
1738-9728
GSI 38 Auto Tymp, V3, Export, 240V
1738-9730
GSI 38 Auto Tymp, V4, USA Tymp + lpsi + Aud.
1738-9735
GSI
38 Auto Tymp,
V4, Export
1738-9736
GSI 38 Auto Tymp, V4, Export, 100V
1738-9738
GSI 38 Auto Tymp, V4, Export, 240V
DESCRIPTION
The GSI 38 is an automatic acoustic admittance and reflex measurement system with
a screening audiometer.
The instrument consists of a probe and a desk-to-base
interconnected via a cable. It is a combination of GSI 17 and GSI 37 plus acoustic
reflex testing capabilities, both ipsilateral and contralateral. The audiometric portion is
a single channel pure tone audiometer, with a pair of air-conduction earphones. Int he
tympanometric mode, the measurement of acoustic admittance is corrected for the
acoustic admittance of the external auditory meatius, and the ear canal volume is
displayed. Also a test cavity assembly is provided.
INSTRUCTION MANUAL
The GSI 38 is supplied with an instruction manual which meets the requirements of the
applicable standards.
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STANDARDS
ANSI S3.39 - 1987
ANSI S3.6 - 1989
IEC 1027-l 991
IS0 645
IEC 601-l
Aural Acoustic Impedance and Admittance Standard Type 3
(Middle Ear)
Audiometric Standard Type 4 (Audiometer)
Aural Acoustic Impedance/Admittance Type 3
Type 4 (Audiometer)
Medical Electrical Equipment General Requirements For
Safety
Designed to Meet International Standards Organization requirements fo r Electro-
Magnetic Compatibility and Safety
ACOUSTIC ADMITTANCE MEASUREMENT SYSTEM - AUTO TYMP
Probe Signals
Frequenc y:
226 Hz, +/- 3%
Sound Pressure Level :
85.5 dB SPL, +/- 2.0 dB, Measured in a 2. 0 cm
3
coupler
(ANSI Spec 90 dB SPL Max)
Harmonic Distortion:
< 5%
Acoustic Admittance Range
0.0 to 1.5 cm
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or 0.0 to 3.0 cm
3
- selected automatically for compensated
tympanogram.
0.2 to 6.0 cm
3
- ECV/cavity limits for initiating pressurization (starting test)
The 0.2 to 6.0
cm
3
is the sum of the ear canal volume and the middle ear admittance.
(Full pressure sweep for 6 cc up to 7000 ft. altitude with no leak)
+/- 5% or +/- 0.1 cm
3
whichever is greater
Tvmpanogram Gradient: Pressure interval at 50% of compensated admittance
peak.
Acoustic Admittance Accuracy

Pneumatic Svstem
Pressure Range (corrected for altitude): + 200 to - 400 dapa (1 dapa = 1.02 mm
water)
Pressure sweeps to at least -100 dapa if tymps complete otherwise sweeps to -400
daPa
Pressure Accuracv:
+/- 15% or +/- 10 daPa whichever is greater.
Rate of Sweep:
600 daPa/sec - for tymp slopes of <0.2 ml per 24 daPa
200 daPa/sec - for tymp slopes =,> 0.2 ml per 24 daPa
Test Time
Approximately 1 sec (high relative tymp will take longer).
Direction of Sweep:
Positive to Negative
ACOUSTIC - REFLEX ACTIVATING STIMULUS SYSTEM
Stimulus Frequencies:
500, 1000, 2000, and 4000 Hz
Stimulus Freauencv Accuracv:
+/- 3%
Stimulus Total Harmonic Distortion:
Stimulus Output Levels:
<5% measured acoustically
except at 4 khz
where speaker driving signalis measured
IPSI: 500, 4000 Hz 80, 90, 100
dB HL
1000, 2000 Hz 85, 95, 105 dB HL
(Time multiplexed with probe tone, 106 ms On/53 ms Off Cycle)
CONTRA:
500, 1000, 2000 and 4000 HZ 90, 100, 110 db HL
(Steady tone, non multiplexed)
Equivalent Hearing Threshold Levels, in DB SPL

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Transducer TvPe
Stimulus Tone
Frequency (HZ)
Contra (Insert Phone)
(in HA-l Coupler)
IPSI
(in HA-l Coupler)
Contra (Insert Phone)
(in IEC 711 Coupler)
500 1000 2000 4000
6.0 1.0 6.0 3.0
7.0
4.5 2.0
3.5
9.5 5.5 11.5 15.0
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Rise/Fall Time: 5 to 10 msec
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Pressure: Automatically set to the pressure of peak compliance - 20 daPa.
Reflex Determination: Minimum compliance change - 0.05 cm
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Test Time:
Approximately 2 -12 seconds, depending on number of test frequency
selections and if tymp only test. (four maximum)
Probe LED indicators:
Green
- blinking: Ready to test
Green - steady: Test in progress
Orange - steady: leak or other error
Yellow - steady: Occlusion
AUDIOMETER
Test Stimulus
Pure Tone Specifications: A pure tone is the only stimulus source for this
audiometer.
Discrete
Frequencies:
125, 250,500.750, 1000,1500,
2000,3000, 4000,6000
and8000 Hz.
Equivalent Hearing Threshold Levels. in dB SPL for TDH 39 Earphones:
Frequency
(Hz) 125 250 500 750
10001500
ReferenceThreshold
(dB) 45.0 25.5 11.5 7.5 7.0 6.5
Frequency
(Hz) 2000 3000 40006000
8000
ReferenceThreshold
(dB)9.0 10.0 9.5 15.5 13.0
Frequency Accuracy:
+/- 3%
Total Harmonic Distortion (From 125Hz to 3000 Hz, measured Acoustically at the
Maximum HL, measured electrically at 4000 & 6000 Hz) < 3%.
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Output Hearing Level Control
Calibrated in dB HL.
Measured in increments of 5
dB
Ranges:125Hz -10to
50 dBBHL
500
to 6000 Hz -10to 90 dBB HL
250 and 8000 Hz -10to70dBB HL
dB" Extended Range switch, which extends the Maximum HL at allAdditionally a
"+1 0
frequencies by IO dB.
Accuracy of all settings of Hearing Level control:
125 to 4000 Hz
+/- 3 dB
6000 to 8000 Hz +/- 5 dB
Signal
to Noise ratio (in 1/3 Octave): >70 dB or less than -10 dB HL
(for levels less than 60 dB HL)
Tone Switch: This electronic switch turns the stimulus signal on/off with minimal
audible distortion.
Modes:
Normal state: Stimulus Off
Activated state: Stimulus On
Rise/Fall Time:
20-50 msec
Measured at the -1 dB and -20 dB points on the signal envelope.
On/Off Ratio:
With the tone switch off, the output will be at least -10 dB below
standard reference equivalent threshold with HL setting of 60
dB.
Above 60 dB HL setting: >70
dB
Cross Channel Leakage: At HL settings of 70 dB or greater, the unwanted signal in
the non test earphone shall be at least 70 dB below the tone
in the test earphone.
Stimulus Signals
Continuous signals
Continuous FM
Pulsed
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Signal Format
Continuous
- Signal steady as long as present bar is depressed
Pulsed
Pulse rate: 2.5 pulses/sec
Duty Cycle: 50%
Rise/Fall Time:
20 - 50 msec
On/Off Ration (between pulses): > 20 dB
Frequency Modulation
FM Rate: 5Hz
FM deviation: +/- 5%
Transducers
Headset: TDH-39 Earphones with 60 ohm impedance
Insert Phone:
Audiovox Model SM-N Earphone, Eartip, Eartip adapter and cord.
Output impedances and voltages on back panel
Left Phone 130 ohm 2.5 volts rms max open circuit
Right Phone 130 ohm 2.5 volts rms max open circuit in Audiometer mode
Insert Phone <1 ohm 2.5 volts rms max open circuit
Subject response input 47 kohm pull up to 5 volts
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DESK-TOP FRONT PANEL CONTROLS AND BACK PANEL CONNECTORS
FRONT PANEL CONTROLS
CONTROLS
Mode
Stimulus
TYMP & REFLEX
Tymp
Tymp & Reflex
Program
Ipsi, Contra or lpsi
&
Contra
AUDIOMETER
Audiometer
Pulse, Steady or FM
Frequencies
Intensity
Tone on Stimulus
Extended Range
Left/Right
Recall or Page Memory
Scroll
Clear
Program Mode
Print
500,
1K, 2K or 4KHz Frequency Up, Down
250, 500,....or 8KHz
Autoset Rotary Knob (numeric)
dBHL
Automatically controlled Present Press to turn on
N/A
+ 10 dB
L or R (uses R phone for L or R
contra)
Page (scrolls through
screens)
M- Erase Screen M- Erase Screen
M- Erase All M- Erase All
Save (saves program
Save
state)
Print Screen Print Screen
Print All Print All
Paper Advance (Press to advance paper, or abort print during printing)
Power Switch
- Power On Switch on Back Panel Green indicator light on Front panel.
Subject Response
- Subject Response Indicator on LCD screen
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