Grason-Stadler TM262 Service Manual

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Covers Welch Allyn TM262 Auto Tymp

Service Manuals

WARRANTY

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. 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.

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, MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE.

If within one year after original shipment it is found not to

NOTE

ANY IMPLIED WARRANTY OF

’

WARNING

The GSI 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 which the instrument may require should be done only by an authorized Grason-Stadler service technician.

is designed to be used with a hospital grade outlet. Injury to personnel or

service

and adjustments

PRODUCT SPECIFICATION

GSI 38 PRODUCT SPECIFICATIONS (RI)

CATALOG LISTINGS

1738-9700

1738-9705 1738-9706

1738-9708

1738-9710

1738-9715 1738-9716 1738-9716

1738-9720

1738-9725 1738-9726 1738-9728

1738-9730

1738-9735 1738-9736 1738-9738

GSI 38 Auto Tymp, GSI GSI 38 Auto Tymp, GSI

GSI 38 Auto Tymp, V2, GSI GSI 38 Auto Tymp, V2, Export, GSI 38 Auto Tymp, V2, Export, 240V

GSI 38 Auto Tymp, V3, USA GSI GSI 38 Auto Tymp, V3, Export, GSI 38 Auto Tymp, V3, Export, 240V

GSI 38 Auto Tymp, V4, USA GSI GSI 38 Auto Tymp, V4, Export, GSI 38 Auto Tymp, V4, Export, 240V

DESCRIPTION

38 38

Auto Auto

Auto

Tymp, Tymp,

Tymp,

Vl,

USA

Vl,

Export

Vi,

Export,

V1,,

Export,

240V

USA

V2,

Export

V3,

Export

V4,

Export

100V

Tymp + lpsi Reflex

Tymp +

Tymp

lpsi/Contra

+Ipsi/Contra

+ Aud.

Tymp + lpsi + Aud.

Reflex

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.

STANDARDS

Acoustic Admittance Accuracy

ANSI S3.39 - 1987

Aural Acoustic Impedance and Admittance Standard Type 3

(Middle Ear)

ANSI S3.6 - 1989

IEC 1027-l 991

IS0 645

IEC 601-l

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 Magnetic Compatibility and Safety

ACOUSTIC ADMITTANCE MEASUREMENT SYSTEM - AUTO TYMP

Probe Signals

Frequenc y:

Sound Pressure Level :

Harmonic Distortion:

226 Hz,

85.5

d B

(ANSI <

Spe c

+/-

SPL ,

+/-

2.0

d B

SPL Max)

dB,

Measured in a 2. 0

cm3

coupler

Electro-

Acoustic Admittance Range

0.0 to 1.5

cm3 or 0.0 to 3.0

selected automatically for compensated

tympanogram.

0.2 to 6.0 The 0.2 to 6.0

cm3- ECV/cavity

limits for initiating pressurization (starting test)

cm3 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

Tvmpanogram Gradient:

Pressure interval at 50% of compensated admittance

+/-

0.1 cm

whichever is greater

peak.

Pneumatic Svstem

Pressure

Pressure sweeps to at least -100 dapa if tymps complete otherwise sweeps to -400 daPa

Pressure Accuracv: Rate of Sweep: 200

Test Time

Approximately 1

Direction of Sweep:

ACOUSTIC - REFLEX ACTIVATING STIMULUS SYSTEM

Stimulus Frequencies:

Range

daPa/sec -

(corrected for altitude): + 200 to - 400 dapa (1 dapa = 1.02 mm

water)

+/-

15% or

600

daPa/sec -

for tymp slopes

sec

(high relative tymp will take longer).

Positive to Negative

500, 1000, 2000, and 4000 Hz

+/-

for tymp slopes of

=,>

0.2 ml per 24

daPa

whichever is greater.

daPa

<0.2

ml per 24

daPa

+/-

Stimulus Freauencv Accuracv: Stimulus Total Harmonic Distortion: Stimulus

Output

IPSI:

(Time multiplexed with probe tone, 106 ms On/53 ms Off Cycle) CONTRA: (Steady tone, non multiplexed)

Equivalent Hearing Threshold Levels, in DB SPL

Levels:

500, 4000 Hz

1000, 2000 Hz

500, 1000, 2000 and 4000 HZ 90, 100, 110 db HL

<5% measured acoustically

where speaker driving signal

80, 90, 100 85, 95, 105 dB HL

except at 4 khz

is measured

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) Rise/Fall Time: Pressure:

Automatically set to the pressure of peak compliance - 20

5 to 10

Reflex Determination:

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:

500 1000

6.0

7.0

9.5

1.0

4.5 2.0

5.5 11.5

2000

6.0

4000

3.0

3.5

15.0

msec

Minimum compliance change - 0.05

Occlusion

daPa.

AUDIOMETER

Test Stimulus

Pure Tone

Specifications:

A pure tone is the only stimulus source for this

audiometer.

Discrete

Frequencies:

125,

250,500.750,

and8000

1000,1500,

Hz.

2000,3000,

Equivalent Hearing Threshold Levels. in dB SPL for TDH 39 Earphones: Frequency

Reference Frequency Reference

Frequency

(Hz) 125 250 500

Threshold

(dB)

(Hz)

Threshold

Accuracy:

(dB) 9.0

+/-

45.0 2000

Total Harmonic Distortion (From

25.5 11.5 7.5 3000

10.0

125Hz

40006000

9.5 15.5

to 3000 Hz, measured Acoustically at the

750

10001500

7.0 6.5 8000

13.0

Maximum HL, measured electrically at 4000 & 6000 Hz) < 3%.

4000,6000

Output Hearing Level Control

Calibrated in dB HL. Measured in increments of 5 Ranges:

Additionally a

"+1

frequencies by IO Accuracy

of all

125Hz -10to

500

to 6000 Hz

250

and 8000 Hz

dB"

Extended Range switch, which extends the Maximum HL at all

dB.

settings

of Hearing Level control:

125

to 4000 Hz

6000 to 8000 Hz

Signal

to Noise ratio (in

1/3

Octave):

(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:

Activated state:

>70 dB

Stimulus Off Stimulus On

dBBHL

-10to90dBB

-10to70dBB

+/-

+/- 5

HL HL

or less than -10 dB HL

Rise/Fall Time:

20-50

msec

Measured at the -1 dB and -20 dB points on the signal envelope.

On/Off Ratio:

Above 60 dB HL

With the tone switch off, the output will be at least -10 dB below standard reference equivalent threshold with HL setting of 60

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

Signal Format

Continuous

Signal steady as long as present bar is depressed

Pulsed

Pulse rate:

Duty Cycle:

Rise/Fall Time:

2.5

pulses/sec

50%

20 - 50

msec On/Off Ration (between pulses): > 20 Frequency Modulation FM Rate: FM deviation:

Transducers

Headset: Insert Phone:

Output

5Hz

+/-

TDH-39 Earphones with 60 ohm impedance

Audiovox Model SM-N Earphone,

impedances and voltages on back

panel

Eartip, Eartip

adapter and cord.

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

DESK-TOP FRONT PANEL CONTROLS AND BACK PANEL CONNECTORS

FRONT PANEL CONTROLS

CONTROLS

Mode

Stimulus

Frequencies

Intensity

Tone on Stimulus

Extended Range

Left/Right

Recall or Page Memory

Scroll

TYMP & REFLEX

Tymp Tymp & Reflex

Program Ipsi, Contra or lpsi

Contra 500,

1K,

2K or 4KHz

Autoset

Automatically controlled

N/A L or R (uses R phone for

contra) Page (scrolls through

screens)

AUDIOMETER

Audiometer

Pulse, Steady or FM

Frequency Up, Down

250, 500,....or 8KHz

Rotary Knob (numeric)

dBHL

Present Press to turn on

10 dB

L or R

Clear

Program Mode

M- Erase Screen M- Erase All

Save (saves program

M- Erase Screen M- Erase All

Save

state)

Print Screen Print All

Paper Advance (Press to advance paper, or abort print during printing)

Power Switch Subject Response

Power On Switch on Back Panel Green indicator light on Front panel.

Subject Response Indicator on LCD screen

Display

The display consists of an LCD panel which will display alpha-numeric, icons and graphics (240 X 64 pixels). Items displayed are:

. . .

. . . . . .

. .

Frequencies (alpha-numeric) and Intensity (alpha-numeric) in

Tympanogram (graphics)

Ear Canal Volume (alpha-numeric) Tymp Peak-Admittance (numeric) Gradient (alpha-numeric) Tymp Peak-Pressure (numeric)

Left/Right Ear (symbol)

Memory Ml to

IPSI/CONTRA

(alpha-numeric) Reflex Tracing (graphics) Reflex with

dBHL/No Altitude calibration or sea level calibration (icon - only in altitude calibration mode.

. .

Generic Error (Error Code)

Audiogram

(dBHL,

format.

Back Panel Connectors

. . .

Left/Right Earphone Insert Earphone Power Cord Patient Response Switch

dBHL

Reflex (alpha-numeric)

Frequencies, cursor on frequency under test) or tabular

PRINTER Printer: Printed Data Format:

Used to provide a hardcopy of the test data.

Graphical area 3.75” horizontal X 6.75” vertical (Audiogram or Tymp & Reflex for 2 ears), 51 columns/in horizontal

4 0

rows /in vertical

Choice of Audiogram or Audiotable:

Printer

Speed:

approximately 1.5 minutes to print three screens Tymp and reflex data for each ear and audiogram for both ears.

and

3 choices of reflex printouts

Wallmount power supplies of various types with 5 pin DIN connections are available.

Either three prong plugs (grounded) or two prong plugs (ungrounded) are provided

depending upon the safety requirements of the country.

OR The internal power supply, powered by AC line, 50 or 60 Hz via IEC 320 power inlet with fuse and on/off switch on the rear panel, is also available, for the countries where

the wallmount power supplies are not available. Two

voltage ranges are provided 200 to 250 V or 90 115 V.

+/-

Line

Voltage variation

Line

frequency range

Line

Voltage Current

Power Consumption Line Frequency variation Low voltage input for Wallmount power supplies 10

10 %

60 Hz

0.2 amps at 120 V or 0.1 amps at 240 V AC. 15 watts maximum while printing

+/-

11 V DC 970

mA.

Hi Pot 3000 volts

SUPPLIED ACCESSORIES

VERSION 1

VERSION 2

VERSION 3

1738-0520 1700-l 030 1700-9622 1738-0100 1738-9600 1738-9610

(1738-0401

‘1738-0520

1700-1030 1700-9622 1700-9660 1738-0100 1738-9610

8000-0079

(1738-0402 1738-0520

1700-1030 1700-9622 1700-9660 1738-0100 1738-9600 1738-9610 8000-0175 8000-0079 (1738-0403

Wall Chart Rolled Ass'y

Test Cavity (0.5, 2.0 and 5.0 cc)

Eartips

Package (screening) Instruction Manual Printer Paper (3 rolls supplied with new unit) Kit, Grease, 0 Ring Label Version 1 installed at factory)

Wall Chart Rolled Ass'y

Test Cavity (0.5, 2.0 & 5.0 cc) Eartips Eartips

Package (screening)

Package (Contra Phone / Diagnostic) Instruction Manual Kit, Grease, 0 Ring Contra Insert Phone Ass’y

Label Version 2 installed at factory)

Wall Chart Rolled Ass’y Test Cavity (0.5, 2.0, & 5.0 cc)

Eartips Eartips

Package (Screening)

Package (Contra Phone / Diagnostic)

Instruction Manual Printer Paper (3 rolls supplied with new

unit)

Kit, Grease, 0 Ring

Test Headset Assembly (TDH-39)

Contra Insert Phone Ass’y Label Version 3 installed at factory)

SUPPLIED ACCESSORIES CONT.

VERSION 4

1738-0520 1700-1030 1700-9622 1738-0100 1738-9600

1738-9610 8000-0175 (1738-0404

OPTIONAL ACCESSORIES

1738-9680 1738-9620

4204-0505 7874-0156 8000-0155

1738-0110

1738-9600 8000-0175 Consisting of:

Carrying Case Dust Cover Patch Cord Subject Response Handswitch

Audiocups

Service Manual

Printer Paper Thermal 4” (10.16 cm wide) 5 rolls Test Headset Ass’y TDH 39 8000-O 142 8000-0046 4204-0147 Earphone Cord Ass’y 8000-0143 Earphone Cushion

8000-0079

Consisting of:

Contra Insert Phone Ass’y 4204-0209 Cable, Coaxial 8000-0037 Earphone, Audiovox, 470 ohm

8000-0255SVC Eartip

1700-9622

Eartips Contains:

1700-9600

Eartips Package Contra Phone / Diagnostic Contains:

Wall Chart Rolled Assembly Test Cavity (0.5, 2.0 & 5.0 cc) Eartops

Package (Screening) Instruction Manual Printer Paper (3 rolls supplied with new unit) Kit, Grease, 0 Ring Test Headset Ass’y (TDH-39) Label Version 4 installed at factory)

(1Ea.)

Head band Ass’y Earphone, 60 ohm, plastic, TDH 39P

Modified

Package Screening

2 Ea. of

19mm,

8mm 11mm,

size

Eartips

4 Ea. of 7mm Yellow, 8mm Pink,

10mm Green, 1 mm, Pink, 12mm Yellow, 13mm Blue, 14mm Green

(1Ea.) MX41AR

(1Ea.)

13mm, 15mm, 17mm,

9mm

Blue,

FUNCTIONAL DESCRIPTION

INTRODUCTION

INSTRUMENT DESCRIPTION

The

GSI

38 Auto Tymp is a versatile combination instrument which provides testing capability for tympanometry alone, tympanometry combined with screening acoustic reflex measurements, and screening audiometry. Four different versions are available to meet your individual testing needs. operation, tympanometry alone and tympanometry plus screening ipsilateral acoustic reflex testing.

A second version permits tympanometry alone and tympanometry

combined with ipsilateral and contralateral screening acoustic reflex measurements.

The third version provides testing capability for all three test modes, i.e., tympanometry

alone, tympanometry combined with ipsilateral and contralateral screening acoustic reflex measurements, and screening audiometry.

tympanometry alone, tympanometry combined with ipsilateral acoustic reflex screening testing and screening audiometry. It is possible to field retrofit versions one, two and four with the full functionality provided with version number three original purchase.

The basic version provides two modes of

Finally, the fourth version allows

after

the time of

PROBE INDICATORS

The probe indicators are show in Figure

2-1

Figure 2-1: Probe Indicators

Yellow:

the probe is occluded; remove the probe and inspect for cause of

occlusion

Green lamp: blinking

GSI 38 Auto Tymps is ready to begin a Tymp; steady

green - test successfully started and in progress.

and a description follows.

P3 Orange:

a pressure leak has been detected.

FRONT PANEL CONTROLS AND INDICATORS

Figure 2-2: Front Panel

Power on indicator and label: indicator is illuminated when the GSI 38 is

receiving power.

Print Screen: pushbutton used to print the currently displayed page of memory.

Print All Memory: used to print all pages of data from memory.

Paper Advance:

causes paper to feed through printer; may be used to load

paper or to provide space between printouts.

FM: used during the Audiometry mode to select a frequency modulated test tone when the present bar is depressed; causes the letters FM to appear on the display when selected.

Steady: used during Audiometry mode to select a continuous test tone when present bar is depressed; causes the steady symbol to appear on the display.

Pulsed: used during Audiometry mode to select a pulsed tone when the present bar is depressed; causes the pulsed symbol to appear on the display.

(dB

Attenuator Knob

HL): used to increase or decrease the intensity of the

test tone presented in Audiometry mode; counterclockwise rotation causes the

intensity to be lowered; clockwise rotation causes the intensity to be increased.

FlO

dB:

+10

used to temporarily extend the intensity range by 10

dB;

causes a large + sign to appear on the display indicating that the extended range has been selected.

M+: save key; during Audiometry mode, causes the threshold information per

frequency to be saved on the display; during Program mode, causes option to

be selected; during Tymp/Reflex mode, causes frequency to be stored as a default parameter.

Fll

and > Hz:

selecting

Selecting < causes the cursor to move the next lower frequency;

causes the cursor to move to the next higher frequency.

F12

F13

F14

F15

F16

F17

F18

Present Bar:

Push downward to present test signal to appropriate earphone;

release to turn test tone off.

Prog(ram):

press to select Program mode screen which lists setting available to reflex presentation format, printout header format, audiogram vs. tabular format, display normal box, and identify frequency range for Audiometry mode.

Aud(iometry):

press to select Audiometry mode. (Available in Versions 3 & 4

only).

TYMP:

Tymp Reflex:

press to select Tympanometry only mode.

press select Tympanometty and Reflex mode.

used to identify right ear under test so that data stored in memory and/or

printed is properly identified; for Versions 3 and 4, used to select right earphone

for audiometry.

L: used to identify left ear under test so that data stored in memory and/or printed is properly identified: for Versions 3 and 4, used to select

left

earphone

for audiometry.

F19

F20

F21

F22

F23

F24

F25

F26

F27

IPSI:

used to select an ipsilateral reflex test.

CONTRA: used

select a contralateral reflex test (available with Versions 2

and 3 only).

500: selects 500

as a stimulus during reflex testing. 1000: selects 1000 Hz as a stimulus during reflex testing. 2000: selects 2000 Hz as a stimulus during

4000: selects 4000 Hz

PAGE:

used to scroll through test results stored in memory.

a stimulus during reflex testing.

reflex

testing.

M-: used to erase currently displayed page of data from memory.

M-:

used to erase all pages of data from memory.

PRINTER AND DISPLAY

The printer cover can be removed to reload paper. See Figure 2-3 for location of the

printer and printer cover. Section 2-7 provides paper loading instructions.

Figure 2-3: Printer and Display

The display indicates test mode, parameters for test and test results. See Figure 2-3 for location of display. Figures 2-4 through 2-8 show the individual display format for each test mode.

Figure 2-4: Display Format for

TYMP

Only Test

Figure 2-5:Display Format for TYMP/REFLEX Test

(Reflex

test results given as “Yes” or “No”).

Figure 2-6: Display for

(Reflex test results given in

TYMP/REFLEX

"dB

HL”).

Test

Figure 2-7: Display Format

(Reflex test results given in

Figure 2-8:

REAR AND BOTTOM PANEL

"dB HL"

Display Format for AUDIOMETRY

LABELS/CONNECTORS

The rear panel labels and connectors each one follows.

TYMP/REFLEX

Test

and also shown with a “tracing”)

are shown in Figure 2-9 and a description of

Figure 2-9: Rear Panel

Company name, address, model, serial number and country of origin.

Symbol denotes a

Type B, Class II Product per IEC 878 as referenced in IEC

601 Standard. Symbol denotes Attention, consult accompanying documents. Symbol indicates a service adjustment part that is intended for service personnel

use only. Connector for handswitch. Input impedance -47 k ohm pulls up to 5 volts. Connector for contralateral insert phone. < 1 ohm, 2.5 volts rms maximum open

circuit. Connectors for right and left earphone. 130 ohm, 2.50 volts rms maximum open

circuit. Label describing low input voltage and current from wall mounted power supply.

5-pin

Power Input Jack.

DIN connector for external wall mounted power supply.

RIO

Power Switch with ON/OFF indicators.

NOTE

There is a symbol on the bottom panel that indicates

entry by qualified service personnel only. This symbol

is marked “B

in Figure

2-10

Bottom Panel.

Figure 2-10: Bottom Panel

Figure 2-11: Test Cavity

PRETEST

TYMP

CHECKS

For your convenience, a test cavity is provided with your GSI 38 Auto Tymp. This test cavity enables you to quickly verify, on a daily basis, the prober calibration of your unit.

GSI strongly recommends that you make this quick check a part of your daily routine. TYMP CALIBRATION VERIFICATIONS To initiate the quick check, select the Tymp only mode and insert the probe into the

0.5

cm3 opening on the test cavity. See Figure 2-l 1.

NOTE

Since the important that the probe is inserted as quickly and as smoothly as possible. During the calibration check, the probe must be held carefully and without movement. Do not place the probe on the same counter as the instrument or any moving object during this check as mechanical noise will be picked up by the probe and interfere with the calibration check.

GSI

38 is designed to start automatically, it is

The calibration check will start automatically if the probe has been inserted into the

cavity properly. This is confirmed by the green lamp changing from blinking to a steady condition. If the orange lamp is illuminated, the probe is not properly positioned within

the cavity so that a large pressure leak exists. If the yellow lamp is illuminated, the

probe tip has been occluded.In either case, remove the probe and wait for the blinking

green lamp. Insert the probe once again. Clean the probe tip if necessary (XXXXXX). When the test sequence is completed, the green lamp on the probe is no longer

illuminated.

Remove the probe from the test cavity and note that the green lamp is

blinking once again. The display will indicate a flat line on the tympanogram along with

the value of the test cavity next to the letters ECV (ear canal volume) i.e., 0.5. The

letters NP will appear next to the labels

cm3

and

daPa

and three dashed lines will appear next to the letters GR (gradient). Since the test cavity is a hard-walled cavity, the tympanogram should be a flat line indicating that there is no mobility in the system. The GSI 38 places the letters NP next to the

cm3 and

daPa

headers to indicate that

there is no peak compliance and, therefore, no peak pressure can be determined

during the quick check. Also, since there is no compliance peak detected, it is not possible to calculate a gradient. Therefore, the GSI 38 displays the dashed lines when a gradient calculation isn’t possible. Using the same sequence, place the probe in the

test cavity opening

0.5

cm3 measurement except for the value placed next to the letters ECV 2.0. If you

wish, the same sequence can be followed with the 5.0

labelled

2.0

cm3

Note that the display looks the same as with the

cm3 opening on the test cavity.

To keep a record of this test cavity calibration check, simply press the print all

pushbutton on the front panel of the GSI 38. Since sound pressure will vary with altitude and barometric pressure, some variation

from the 0.5, 2.0 and 5.0 cm

readings may be observed. Your GSI 38 is carefully calibrated at our factory which is at approximately 250 feet above sea level. If you are located at an elevation of 1000 feet or higher, your instrument may need to be

recalibrated to account for your elevation (See Section XXXX). If is not necessary to

recalibrate for barometric pressure changes on a daily basis. Just keep in mind that a change in barometric pressure (i.e., from low to high or high to low) will slightly affect

the test cavity readings. ALTITUDE ADJUSTMENT The Altitude calibration adjustment allows the instrument operator to “correct” the ear

canal volume

(ECV)

measurement and test cavity volume measurement

for variations

due to altitude. Because the GSI 38 is a pressure-sensitive device which makes

measurements relative to ambient air pressure, changes in air pressure due to weather

or altitude will affect the ECV read-out of the instrument. The slight pressure change

resulting from changing weather conditions will usually yield volume read-outs within +/- 0.1

these cavity values by as much as 30%. These

the accuracy of the compliance measurement system in any way.

cm3

of the expected cavity value, but pressure changes due to altitude can shift

changes in pressure do not affect

However, many

instrument operators prefer that their equipment give ECV values as they would appear

at sea level. The altitude calibration mode allow the operator to adjust his/her Auto Tymp without the services of a qualified GSI representative.

TABLE 2-1 Altitude Correction

ALTITUDE CORRECTION

Altitude (ft)

1,500 2,000-3,500 4,000- 6.000

6.500- 7.600

6.600- 6.000 24+/-

6.500-10,000

---

2.1

2.2

2.3

2.5

Altitude

+/-

0.1

+/-

0.1

+/-

0.1

+/-

0.1

Table (cm3)

The altitude calibration mode can only be entered when the

GSI

38 is powered up from its “off’ state while the program mode pushbutton, PROG is depressed. Hold the PROG pushbutton for approximately five seconds.

STEP 1

When entering the altitude mode the display will read as follow:

Altitude Mode

ECV 2.0 cm3 9.99 Standard

(E71) is displayed in the bottom right corner of the display until the probe is in the 2.0 cm3 cavity.

STEP 2

Place the probe into the

2.0cm3 cavity provided with the instrument and check

value against the altitude correction table for accuracy.

STEP 3

If the measured volume is not within the published table value

+/-

.1cc, then the operator should exit the altitude mode by pressing the PROGRAM MODE pushbutton and contact field service. Providing the measured volume agrees with the published

table

With

+/-

.1cc, the operator may proceed with the altitude adjustment.

STEP 4

the probe still in the 2.0

cm3 cavity, select the page pushbutton to enter the

custom calibration mode. Custom will appear on the fourth line of the display.

STEP 5

The value now displayed in the c m to the current altitude.

If the value displayed is 2.0 cc then the volume is adjusted to

the current site. If the value is not 2.0 cc

display area is the volume measured and adjusted

+/- .1,

then press the SAVE pushbutton M+ to customize the volume measurement to the current altitude. The measured volume should now read 2.0 cc.

STEP 6

To exit the altitude mode press the PROG pushbutton to return to normal mode.

PROGRAM MODE

To enter the program mode, select the

PROGram

pushbutton located on the front

panel. The following screen appears the first time you enter the Program mode after

you receive your GSI 38 from the factory. (in other words, there are the default settings

used at the factory during production).

Program Mode

Reflex HL + Curve

Reflex HL only Print - Aud Table Reflex Yes/No l Normal Box ASHA

* Pm Header GSI

Pm Header Off Pm Header Custom Aud Range Narrow

Note that these selections. fall into

five

User Selections

l Print - Audiogram

Normal Box Off

* Aud Range Normal

different groups of controls:

Reflex format for printer Print header format

Audiometric test result format

Status of normal box

Audiogram frequency range

The default setting for each group of controls has an asterisk

(*)

before it so that it is

easy to scan the settings selected for each group.

REFLEX FORMAT

Reflex test results can be displayed and printed in three different ways: reflex dB HL

plus curve; reflex

reflex

HL plus curve. This means that all reflex test results will appear on the

HL only; or reflex yes/no. The default setting for this grouping is

display and the printout with the following information.

NOTE

If you the square cursor next to the asterisk Header custom and press M+ to cause the line appear display.The word SAVED will appear at the lower tight

margin indicating that the custom header is still

selected.

had previous/y entered a custom header, position

(*)

in front of Pm

cursor

at the left-hand margin along the bottom of the

To move the cursor from the left-hand margin without inserting a letter or number,

select the character which represents a space (i.e., rotate the knob one position to right of the letter A). Use the > Hz pushbutton to move over to the next character position. Repeat this sequence until the cursor is moved over to the desired start position for the

first character to appear in your header.

Rotate the

HL knob to select the

appropriate characters to spell out the desired header. After selecting each character,

use the > Hz pushbutton to move over to the next character position. Once all of the header characters have been added, press the M+ pushbutton to save your header in

memory. The word SAVED will appear on the right-hand margin indicating that you

header is now saved. The square cursor will reappear next to Pm Header Custom. It is now possible to exit the program mode or to sequence on the next user selection.

To exit the program mode, press the pushbutton labeled PROG. Enter a single test

result and select print screen to see how the custom header looks. AUDIOMETRIC FORMAT DURING PRINTING The audiometric test results can be printed out in an audiogram format (PRINT

AUDIOGRAM) or in a tabular format (PRINT - AUD TABLE). The default setting for this function is the audiogram format.

NOTE

When a specific frequency is deselected for testing, the result will be frequency. threshold exists at that untested frequency.

Move the < or > Hz pushbutton

AUD TABLE.

Next, select the M+ pushbutton to save this format as the new default

parameter. Note that the

a break in the audiogram line at that

This eliminates the assumption that a

position the cursor in front of the description

word

SAVED appears in the lower right-hand comer of the

PRINT-

display to indicate that this new setting has been saved. With PRINT-AUD TABLE selected, all audiometric test results will appear in a table with the frequency range typed horizontally along the top of the table followed by two lines of test data. The test

results for the right ear will appear next to the letter R and below each frequency

tested. Similarly, the test results from the left ear will follow below the right ear results.

This setting (PRINT-AUD) selects the format for the printout only. An audiogram always appears on the screen while in this mode.

NORMAL BOX FORMAT

NOTE

It is possible to have the normal box, as described by tympanogram screen and printout. The boundaries for this normal box are -150 to

+100 daPa

and 0.2

cm3 to 1.4

cm3.

ASHA,

appear on the

daPa

NOTE

A compliance value of 7.5 automatically turn off the

ASHA

cm3 or greater will

normal box.

The normal box is the default setting. To deselect this normal box, move the square cursor with either the < or > Hz so that it is placed in front of the words Normal Box Off.

While the cursor is in this position, select the M+ pushbutton to save this feature as the

new default setting. Note that the word SAVED appears in the lower right-hand margin.

This message assures you that the normal box ill not appear on the tymp screen or

printout.

AUDIOGRAM RANGE All eleven frequencies are available during audiometry or the range can be abbreviated

to eight frequencies.

The default setting is Aud Range Normal. To select the

abbreviated frequency range, position the square cursor in front of the feature Aud

Range Narrow. Press the M+ pushbutton to save this narrow range for audiometric

testing. Note that the word SAVED will appear in the lower right-hand margin and the

asterisk now appears in front of the narrow range selection. The normal range of

frequencies include 125 Hz through 8000 Hz. The narrow range of frequencies

includes 500 Hz through 6000 Hz. Please note that in the Aud mode, if the narrow range is selected, the < and > Hz pushbuttons will allow you to scroll through this

abbreviated frequency range only. Both the screen and printout will still be

labelled

with the full range of frequencies. i.e., 125 Hz through 8000 Hz.

EXIT PROGRAM MODE Exit the program mode by selecting the PROG pushbutton. Note that you return to the

test mode which was operational prior to entering the program mode.

TEST IN MEMORY The Tymp and TympReflex test results

test sequence

ends.

Audiometric test

are automatically stored in memory when the

results are stored in memory when the M+

pushbutton is pressed a total of eight memory locations are available with the GSI 38. Each test result is assigned a memory location number in order of sequence obtained starting with Ml and continuing up to M8.

To review the individual test results, press the PAGE pushbutton. Note that the screen

contains the appropriate format for each test type stored (e.g., tympanogram or audiogram). The memory number is located in the upper right-hand corner of each

screen.

If, for example, only five tests were stored in memory, only five memory

locations can be scanned. The memory can be scanned a page at a time by pressing

the PAGE pushbutton once and observing the results. The entire memory can be scrolled through by holding the PAGE pushbutton down continuously.

MEMORY ERASE

If there is a particular test result that you wish to delete before printing, PAGE to this

test result and press the M- pushbutton. This causes that particular test result to be erased from memory. The erase mode is accessed when the operator selects a test

to erase and presses the M- pushbutton. The LCD displays a blank screen for erased

memories with the memory location number located at the top right corner. Upon exit form the erase mode the stored memories reshuffle and replace the empty memory with the remaining tests in the order in which they were run. The erase mode will be exited once the operator presses the PRINT ALL or ERASE ALL pushbuttons or any

pushbutton that would normally begin the setup of a new test. Please note that when the erase mode is entered, a current audiogram is no longer accessible to change or to store new HL values.

NOTE

The instrument is programmed to default to the right ear

at 0 audiometric test.

and 1000 Hz upon selection of a new

If you should wish to erase all tests from memory, press the M-(ERASE ALL) pushbutton. (For example, the test results have been printed and you wish to test another person).

NOTE

Be certain that you wish to remove all tests from

M--

memory before pressing the the erasure

pushbutton!

occurs

immediately upon pressing the

pushbutton because

M--

PRINTING TEST RESULTS

The printout will begin with a header if it is selected during the program mode (i.e.,

GSI 38 or a custom header designed by you). The next two lines contain space for entering the individuals name and the test date. This is followed by the test results in the order

that they were obtained/selected.

Either a single test can be printed from memory or the entire group of tests in memory can be printed. To print a single test from memory, use the PAGE pushbutton to arrive

at the desired test result to print.

Once this test is displayed, press the PRINT

SCREEN pushbutton. To print all tests in memory, simply select the PRINT ALL pushbutton. When

PRINT ALL

is pressed and two audiogram tests are stored in memory, they will combine under the following conditions. There must be one left test and one right test sequentially stored in memory. A left and right audiometric pair of tests will not be combined if they are separated in the memory by a tymp test. Therefore, when tests are erased, the resorting could cause a change in left, right or right, left combined when

PRINT ALL is selected. Prior to selecting PRINT ALL the operator should scroll through the tests in memory to determine where the audiometric tests are located. This will help the operator to avoid combining tests from different patients.

CIRCUIT THEORY

+ 67 hidden pages

Grason-Stadler TM262 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WARRANTY

WARNING

PRODUCT SPECIFICATION

CATALOG LISTINGS

DESCRIPTION

INSTRUCTION MANUAL

STANDARDS

AUDIOMETER

FRONT PANEL CONTROLS

Back Panel Connectors

Printer

SUPPLIED ACCESSORIES

OPTIONAL ACCESSORIES

FUNCTIONAL DESCRIPTION

INSTRUMENT DESCRIPTION

PROBE INDICATORS

FRONT PANEL CONTROLS AND INDICATORS

PRINTER AND DISPLAY

REFLEX FORMAT

NORMAL BOX FORMAT

MEMORY ERASE

PRINTING TEST RESULTS

CIRCUIT THEORY