GSi 61 User Manual

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GSI 61

USER MANUAL

Setting The Clinical Standard www.grason-stadler.com

Grason-Stadler, 7625 Golden Triangle Drive, Suite F, Eden Prairie MN 55344

800-700-2282 • 952-278-4402 • fax 952-278-4401 • e-mail info@grason-stadler.com

Part Number 1761-0100 Rev B

Title:

GSI 61 User Manual

reproduced or transmitted in any form or by any means without the prior written permission of Grason-Stadler Inc. The information in this publication is proprietary to Grason-Stadler.

Compliance

The CE 0344 Stadler is an ISO 13485 certified corporation.

European Authority Representative

Grason-Stadler Kongebakken 9 2765 Smørum Denmark

0344

mark identifies compliance with the Medical Device Directive 93/42/EEC. Grason-

1761-0100 Rev. B i

Warnings, Cautions and Errors

Warning! Accessory equipment

connected to the analog and digital interfaces must be

certified to the respective IEC standards (IEC950 for data processing or IEC

60601-1 for medical equipment) Furthermore, all configurations s hall comply

with the system standard IEC 60601-1-1 Everyone who connects additional

equipment to the signal input or signal output port configures a medical system,

and is therefore responsible that the system complies with

Cautions

the requirements of the system standard

IEC60601-1-1 doubt, consult the technical service

department or a local representative.

If in

The GSI 61 Clinical Audiometer is designed to be used with a hospital grade outlet. Injury to personnel or damage to equipment can result w hen a three-prong or two-prong adaptor is connected between the GSI 61 power plug and an AC outlet or extension cord.

Audiometers which bear the Underwriters Laboratories, Inc with accessories that have the proper electrical compatibility and are listed as meeting the requirements of the UL Medical and Dental Equipment Standard. Connecti on of accessories not meeting these requirements may result in electrical leakage currents in excess of those allowed by the standard and present a potential electrical shock hazard to the person being tested.

This warning icon found on the back of the LCD panel indicates dangerous voltage within the

panel. Access to the LCD pa nel is lim ited to authorized Grason-Sta dler service representatives.

When testing with the High Frequency earphones, do not allow the presentation of the signal at the maximum dB HL to exceed 10 m inutes. The buildup of increased temperature can cause harm to the earphones.

This caution label refers the user to the accompanying literature and manuals.

This icon indicates that the GSI 61 is in compliance with Class 1, T ype B requirements of IEC 601-1.

label should be interconnected

Cautions

The following is the list of status messages which will occur with operation of the GSI 61 Audiomet er. These messages will be displayed in one of the bottom three message areas.

1761-0100 Rev. B

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Status Messages

Using Default Data Indicates that the selected transducer and stimulus are not

Erasing Data Indicates that the GSI 61 is clearing stored test information. Saving Data Indicates that the test information is being saved into memory. No T est Data Stored Indicates that there is no test data available to be erased or

Check Hi-Freq Cables Indicates that the High Frequency function is enabled but the

Invalid Selection Indicates that an incorrect selection, such as incompatible

Not Available Indicates an uninstalled option has been selected. No T est Data Stored Indicates that there is no data available for printing, although

Data T ransfer Indicates that data has been processed either by the printer or

Check Printer A check is done to see if the printer is connected and ready to

Printing This is an informational message which is displayed while

No Printer Response If communications problems occur during the course of printing,

calibrated to standard specified (ANSI/ISO) levels.

printed.

cables plugged into the L&R phone jacks are not the GSIspecified type.

transducers, has been made.

the Print Audiogram button has been pressed.

by a remote computer .

receive data by checking the hardware flow control line. If printer is not ready this message will be flashed.

outputting data to the printer. It appears on th e lower right section of the LCD.

this error message will be flashed.

Communications Error Messages

The following communication errors may occur during data transmission through the RS 232 communications:

Comm error: par ity Check GSI 61 and PC parity settings. Comm error: framing Check GSI 61 and PC selections for number of stop

Comm error: overrun See ‘framing’. Comm error: multiple Check parity, baud rate, number of stop bit s and

Comm er ror: spurious Soft error. Should not be repeata ble; if so, problem

Comm error: break See ‘spurious’.

If the word “Help” followed by an error code is displaye d, note the Help Code number . See the GSI 61 Service Manual (1761-0110) for detailed descriptions of these. Turn off the power to the GSI61 and wait 30 seconds. Restart the instrument. Often the error will be cleared by this action. If the error persists, contact an authorized Grason-Stadler service representative.

bits and number of bits per comm and.

byte size on GSI 61.

could be anywhere in GSI 61 digital circuits or PC’ s communication circuits.

1761-0100 Rev. B

iii

Warranty

We, Grason-Stadler, 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 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.

Note: Changes in the product not approved in writing by Grason-Stadler shall void this warranty. Grason-Stadler shall not be responsible 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 ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

1761-0100 Rev. B

Specifications

Standards

Pure Tone - Channel 1 and Channel 2

The GSI®61 Clinical Audiometer meets or exceeds the following st andards: ANSI S3.6-198 9; ANSI S3.43-1992; IEC 645-1 (1992); IEC 645-2 (1993); ISO 389; UL 2601-1 Medical Electrical Equipment; IEC 601-1 Medical Electrical Equipment and CSA C22.2, No. 601.1-M90 Electromedical Equipment.

The CE mark on this product indicates it conforms with the provisions noted in the 93/42/EEC Medical Devices Directive.

CE Mark per Medical Device Directive (93/42/EEC)

0344

European Authority Representative Grason-Stadler A/S Kongebakken 9 2765 Smørum Denmark

Frequency Range

Air Conduction 125 Hz to 12000 Hz High Frequency (optional) 8 k Hz to 20 k Hz Bone Conduction 250 H z to 800 0 Hz Sound Field (optional) 125 Hz to 12,000 Hz (125 Hz to 16,000 Hz

only with High Frequency option, 1761-9630, enabled) Paired Insert (optional) 125 Hz to 8000 Hz Single Insert (optional) 250 Hz to 6 000 Hz Accuracy ± 1 % T otal Harmonic Distortion £2% (earphones and paired insert phones*)

£5% (bone vibrator)

Intensity Range **

Air Conduction: -10 dB HL to 120 dB HL High Frequency:* -20 dB HL to 100 dB HL (with Sennheiser HDA 200

Phones) Bone Conduction:

Mastoid -10 dB HL to 80 dB HL

Forehead -10 dB HL to 70 dB HL Sound Field:* -10 dB H L to 96 dB H L Paired Inserts:* -10 dB HL to 110 dB HL Single Insert:* -10 dB HL to 110 dB HL

Masking Intensity Range (Calibrated in effective masking)

Narrow Band N oise: Maximum dB HL is 15 dB below tone

White Noise: Maximum dB HL is 30 dB below tone

* Optional accessories ** The maximum HL values are applicable to the middle frequencies only.

1761-0100 Rev. B

Grason-

tadler GSI® 61 CLINICAL

Speech Channel 1 and Channel 2

Microphone: For live voice testing and comm unications External A and External B: Accepts recorded speech material from external

stereo tape cassette or CD player

Intensity Range:

Air Conduction: -10 dB HL to 105 dB HL Bone Conduction:

Mastoid -10 dB HL to 65 dB HL

Forehead -10 dB HL to 55 dB HL Sound Field:*** -10 d B HL to 90 d B HL Paired Inserts:*** -10 dB HL t o 95 dB HL Single Insert:*** -10 dB H L to 95 dB H L

Masking Intensity Range

Speech Noise:

Air Conduction (TDH 50P and Ins ert Phones *) and Bone

Conduction

Maximum dB HL are the same as the speech type signals.

Sound Field: -10 dB HL to 80 dB HL White Noise: Equal to Speech Noise

*** Optional Accessories

Steady: Tone continuously present. Pulsed: T one pulsed 200 mSec ON, 200 msec OF F . FM : Tone modulated ± 5% of cente r frequency at a rate of 5 Hz.

Signal Format

Special Test Capabilities

Communications and Monitoring

Dimensions and Weight

ALT : T one alternating between Channel 1 an d Channel 2: Cha nnel

1 is 400 mSec ON, 400 mSec OFF followed by Channel 2, 400 mSec ON, 400 mSec OFF .

SISI: An intensity increment is added to a tone in the selected channel for

200 mSec, every 5 seconds. The HL increments are available in 1, 2 or 5 dB steps.

High Frequency: T one testing in the freque ncy range of 8 kHz to 20 kHz

using High Frequency phones or Sound Field. The frequencies available for testing are: 8 kHz, 9 kHz, 10 kHz, 11.2 kHz, 12.5 kHz, 14 kHz, 16 kHz, 18 kHz and 20 kHz (Optional).

Talk Forward: Permits the tester to speak through the test microphone into the

selected transducer at the intensity level set by the front panel controls.

Talk Back: Allows the tester to listen to comments from the subject in the

testing booth.

Monitor: Th e monitor h ead set or monito r speak er can be u sed b y the tester

to listen to Channel 1, Channel 2 and/or T a lk Back signals.

W x D x H : 20 inche s x 15 inches x 12.6 inches (LCD raised)

50 cm x 39 cm x 32 cm

Height with LCD lowered - 6 inches (15 cm) Weight: 19 pounds 8.7 kg Shipping Weight: 30 pounds 13 .6 kg

1761-0100 Rev. B

Instrument Specifications

Power Consumption Accessories Supplied

Optional Accessories

90 Watts

Test Headset (Matched set TDH-50P) -------------------------------------------------- 8000-0063 Bone Vibrator (B71) ----------------------------------------------------------------------- 8000-0130 Subject Response Handswitch ----------------------------------------------------------- 7874-0156 Test Microphone/Monitor Headset with coiled cord ---------------------------------- 1761-9623 Talk Back Microphone -------------------------------------------------------------------- 8000-003 9 Patch Cords, 6 ft. Grey (4/each) ------------ ---------------------------------------------- 4204-0505 Power Cord --------------------------------------------------------- (Country and voltage specific) Instruction Manual - English -------------- -- -- -------------------------- -- --------------- 1761-0100 Instruction Manual - Spanish ------------ -- -- -------------------------- -- ----------------- 1761-0104 GSI Suite Audiometic Data Management Software ---------------------- ------------- 1010-9600

CD Player ----------------------------------------------------------------------------------- 1761-9621 Stereo Tape Cassette -------------------------------- -------------------------------------- 1761-9622

Speakers, Basic (90 dB) with cables (125 - 16 kHz) ------------------------------------- 1761-9630 Speakers, High Performance (96 dB) with cables (125 - 8 kHz) ----------------------- 1761-9635

Booster Amplifier (220-240V) with cables, for use with the High Performance Speakers only----------------------------------- 1761-9636 Booster Amplifier (100-120V) with cables, for use with the High Performance Speakers only----------------------------------- 1761-9637

Sound Field System, High Performance (102 dB, 220-240V , 125 - 8 kHz) includes High Performance Speakers and Booster Amp ---------------------------- 1761-9638 Sound Field System, High Performance (102 dB, 100-120V , 125 - 8 kHz) includes High Performance Speakers and Booster Amp ---------------------------- 1761-9639

Paired Insert Phones (E•A•R TONE E•A•R TONE E•A•R TONE

Replaceme nt Foam Eartips , Std----------------------------------------- 1700-9604

Replac ement Foa m Eartips , Small -------------------------------------- 1700-9605

3A) ----------------------------------------------- 1700-9606

Single Insert Phone (470) -------------------------------- ---------------- ---------------- - 1700-9609

High Frequency Headphones w/booth cables ----------------------------------------- 1761-9602 High Frequency Cables (to sound booth) --------------------------- ------------------- 1761-9603 (If using High Freq Headphones, these cables are required to connect to the GSI 61)

High Frequency Headphones w/cables to GSI 61 ---- ---- ---- ---- ---- ---- ---- ---- ---- - 1761-96 04 High Frequency Cables (to GSI 61) ---------------------- -------------------- ------------ 1761-9605 (If using High Freq Headphones, these cables are required to connect to the GSI 61) Remote RS 232/Pr inter Inter face -------------------------- -------------------------- ------ 1761-9680 Printer, Color (North Am erica only) ------------------------------------------------------ 1761-9610 Service Manual ----------------------------------------------------------------------------- 1761-0110 Audiocups ---------------------------------------------------------------------------------- 8000-0155 OtoAccess (Network Software for GSI Suite) --------------------------------------- 1015-9600

1761-0100 Rev. B

vii

Grason-Stadler GSI® 61 CLINICAL

Catalog Listings

GSI 61 Clinical AudiometerwithoutRemote

English ---------------------------------------------------------------------------------- 1761-9700-XX French ------- -------------------------- -------------------------------------------------- 1761-9700-XX German --------------------------------------------- ------------------------ ------------- 1761-9700-XX

Italian -----------------------------------------------------------------------------------1761-9700-XXI

Spanish --------------------------------------------------------------------------------- 1761-9700-XXS

GSI 61 Clinical Audiometer with USB Remote

English ---------------------- ------------------------------------------------ -- -- -- ---- 1761-9780-XXE French --------------------------------------------------------------------------------- 1761-9780-XXF German ----------------------------------------- --------------------------------------- 1761-9780-XXG

Italian -----------------------------------------------------------------------------------1761-9780-XXI

Spanish--------------------------------------------------------------------------------- 1761-9780-XXS

Notes -XX refers to the voltage and plug requirements for the country of operation.

viii

1761-0100 Rev. B

Electromagnetic Compatibility (EMC)

1761-0100 Rev. B

Table of Contents

Preface

Chapter 1

Introduction

Chapter 2

Installation

Title---------------------------------------------------------------------------------------------------------i

Warnings, Cautions and Errors- -----------------------------------------------------------------------ii

Warranty -------------------- -- -------------------------- ------------------------------------------------iv Specifications ------------------------------------------------ -- -------------------------- -- -- -----------v

Standards -------------------------------------------------------------------------------------------v Pure Tone - Channel 1 and Channel 2 --- ------------------------------------------------------v

Speech Channel 1 and Channel 2 --------- -----------------------------------------------------vi Signal Format ---------------------- -- -------------------------- -- -------------------------- -------vi Special Test Capabilities ------------------------------------------------------------------------vi Communications and Monitoring --- --------------------------------------------------- --------vi

Dimensions and Weight------------------------------ ------------------------ --------------------vi Power Consumption ---------- -------------------------------------------------------------------vii Accessories Supplied----------------------------------------------------------------------------vii Optional Accessories ----------------------------------------------------------------------------vii Catalog Listings ---------------------------------------------------------------------------------viii

Electromagnetic Compatibility (EMC)-------------------------------------------------------------ix

Introduction ------------------ -- -- -------------------------------------------------- ------------------- 1-1

External Inspection --------------------------------------------------------------------------------- 2-1 Unpacking ------------------------------------------------------------------------------------------- 2-1 Accessories Supplied ------------------------------------------------------------------------------ 2-1 Connectors, Controls and Indicators ------------------------------------------------------------- 2-2

Rear Panel -------------------------------------------------------------------------------------------- 2-2

Left Side Panel--------------------------------------------------------------------------------------- 2-4 Right Side Panel ------------------------------------------------------------------------------------- 2- 4 Front Panel Controls -------------------------------------------------------------------------------- 2-5

V ali d Stimuli Combi nations --------------------------------------------------------------------2-8

V alid T ransducer Combinations --------------------------------------------------------------2-8

Displays ----------------------------------------------------------------------------------------2-14

Test Microphone/Monitor Headset ----- ------------------- ------------------ ------------------ - 2-17

Optional Accessories ------------------------------------------------------------------------------2-18

Hearing Level And Freque ncy Limits------ ---------------- -------------- -------------- ----------2 - 2 4 Initial Installation ----------------------------------------------------------------------------------2-26

Single Room Environment ------------------------------------------------------- ------------2-27 Two Room Installation ------------------------ ------------------------------ ------------------2-27 Loudspeaker Installation ---------------------------- -----------------------------------------2-29

1761-0100 Rev. B

Contents-1

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Grason-Stadler GSI® 61 CLINICAL AUDIOMETERGrason-Stadler GSI® 61 CLINICAL AUDIOMETER

Chapter 3

Operation

Preliminary Checks--------------------------------------------------------------------------------- 3-1

Patient Instructions ----------------------- ---------- -------- -------- ---------- -------- ---------- ---- 3-2

Placement of the Earphones ---------- --------------------------------------------------------3-2 Placement of the Insert Phone ---------------- ------ ------ ------ ------ ------ ------ ------ ------ 3-2 Placement of the Bone Vibrator ---------------------------------------------------------------3-2

Routine Test Procedures ------------- ------------------------ ------------------------------------- 3-3

Threshold Determination (Pure Tone): Modified Hughson-Westlake ------ -- -- -- -- ----3-3

Spondaic Speech Testing, Speech Reception Threshold (SRT) --------------------------3-4 Speech Discrimination (PB Words) -----------------------------------------------------------3-4

Chapter 4

Special Test Procedures

Alternate Binaural Loudness B alance (ABLB) or Fowler T est -------------------------- ------ 4-2 Monaural Loudness Balance (MLB) Test -------------------------------------------------------- 4-3 Short-Increment Sensitivity Index (SISI) --------------------------------------------------------- 4-4

Modifications to the SISI test ---------------------------------------------------------------- 4-4

High Frequency Testing (Optional)------------------------------------------------------------- -- 4-5

High Frequency Testing: Setup Diagrams ---------------------------------------------------4-5 Sensorineural Acuity Level (SAL) T est ---------------------------------------------------------- 4-6 Hearing Aid Evaluation -------------- -------------------------- -- -------------------------- -- ------ 4-6 Tone Decay Test ------------------------------------------------------------------------------------ 4-8

Lombard or Voice-Refl ex T est ---------------------------------------------------------------------- 4-8 Delayed Auditory Feedback (DAF)--------------------------------------------------------------- 4-9

Staggered Spondaic Word Test (SSW)---------------- ------------------------------------------4-10

Doerfler-Stewart T est ------------------------------------ ---------------------- --------------------4-1 1

Modified Doerfler-Stewart Test--------------------------------------------------------------4-11

Pure Tone Stenger Test ---------------------------------------------------------------------------4-12

Chapter 5

Routine Maintenance

Biological Calibration Che ck ----------------------------------------------------------------------- 5-1 Periodic Checks ------------------------------ ------------ ------------ ------------ ------------ ------- 5-1 Calibration Reference Levels ---------------------------------------------------------------------- 5-3

Line Voltage Brownout and Interruptions ---------- ---------------- ---------------- -------------- 5-6 The Message “CAL” -------------------------------------------------------------------------------- 5-6 The Message “Help” -------------------------------------------------------------------------------- 5-6

Contents-2

1761-0100 Rev. B

T able of Content s

Chapter 6

Remote Options

RS 232 Configuration --------------------------------------------------------------------------------6-1 USB Overview ---------------------------------------------------------------------------------------- 6-3 Driver Installation and System Setup -------------------------------- ------------------------------6-4

GSI Suite -------------------------------------------------------------- ------------------------ ---------6-4

Data Flow Control Operation ------------------ ---------------- ------------------ ---------------- --- 6-5

Hardwa re Flow Contro l -------------------------------------- -------------------------- -------- 6-5 Softwa re Flow Co ntrol -------------------------------------- ------------------------ ----------- 6-5

Cable Connections---------------------------- ------------------------------------------------- 6-5

Data Transfer ----------------------------------------------------------------------------------------- 6-6

Record and Field Formatting ------------------------------------------------------------------ 6-6

Checksums -------------------------------------------------------------------------------------- 6-6

Remote Input Operation----------------------------------------------------------------------------- 6-7

Input Record Type -------------------------------------------- ---------------------------------- 6-7

Input Record Type 1 to 4 ---------------------------------------------------------------------- 6-7

Input Record Type 5 - Pushbutton Code Record ------------------------------------------- 6-7 T ype 6- Set Test Frequency Record --------------------------------------------------------- 6-11 T ype 7 - Set HL Record ------------ ------------------------ ---------------------- ------------- 6-12

Remote Output Operation---------------------------------------------------------------------------6-13

T ype 1- GSI 16 Compatible Short Data Record--------------------------------------------- - 6-13

T ype 4 - Error Record -------------------------------------------------------------------------- 6-16 Type 5 - GSI 61 Short Data Record ----------------------------------------------------------6-16 T ype 6 - Test Battery Data Record ------------------------------ ---------- ---------- ---------6 -18

Rec ord Pre fix ------------------------ ------------------------------------------ -----------------6-18

Left Ear T est Data - Pure T one ---------------------------------------------------------------6-18

Speech Test --------------------- ------------ -------------- -------------- ------------ -----------6-20 SISI Test ------------------------ -------------- ------------ -------------- -------------- ----------6-2 0

Alter nate (AB LB) ----------------------- ---------------------------------- ---------------------6-22

Right Ear T est Data ----------------------------------------------------------------------------6-23

Record Term inator ----------------------------------------------------------------------------6-23

T ype 7 - Instru ment Type --------- ------ ------ ------ ------ ------ ------ ---- ------ ------ ------ --6-2 3

Remote Output Operation continued ----------- --------------------------------------------------6-24

T ype 8 - Unit Configuration Record ---------------------------------------------------------6-24

Appendix

Bibliography

Regulatory S

mbols

Test Words ---------------------------------------------------------------------------------------- A1-1 Part One -------------------------------------------------------------------------------------------- A1-1 Part Two -------------------------------------------------------------------------------------------- A1 -1

Bibliography ------------ ---------------------- ---------------------- ------------------------ ---------- B-1 Bibliography for Test Procedures ------------ -------------- -------------- ---------------- --------- B-2

Regulatory Symbols------------------------------------------------------------------------------------C-1

1761-0100 Rev. B

Contents-3

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Blank page.

Contents-4

1761-0100 Rev. B

Chapter 1

Introduction

for the test sequence. The Tracking pushbutton allows the operator to synchronize intensity changes on Channel 2 with those m ade on Channel 1.

All data, including the instrument selected parameters, are displayed on an articulating Liqui d Crystal Display (LCD). Pure tone test results are presented in either a “status” or an audiogram format. The status format clearly shows all test conditions and permits the calibration check of input from the microphone or from recorded test materials. The audiogra m format for pure tone testing displays the stored threshold values for the patient un der test. The display can be tilted to improve the viewing angle for an individual user and to allow easy access to the rear jack panel.

Introduction

The GSI 61 Clinical Audiometer is a microprocessor controlled, two channel audiometer for use in the clinical/diagnostic environment. It has two separate sets of controls, one for eac h of the channels. Each channel can be operat ed indepe ndentl y by its tone bar, or the two channels can be activated simultaneously through use of the interlock button.

The GSI 61 permits the output routing of the test signal through earphones (matched TDH-50P), a bone vibrator (B71), optional loudspeakers, optional paired I nsert Phones (EAR) or sing le Insert Phone, and optional High Fre quency ( Sennheiser HDA

200) Earphones.

The diagnostic tests are easily selected through use of the ergonomically designed front key panel. Flexible routing selections permit the user to select that which is appropriate

The GSI 61 provides testing capabilities for a standard battery of diagnostic audiometric tests including ABLB, SISI, Tone Decay, Stenger, Doerfler-Stewart, Lombard, and Staggered Spondaic Word test (using a three head tape recorder). The High Frequency option extends the frequency range (from 8 kHz to 20 kHz) for ototoxic dru g monitoring.

The GSI 61 has the optional capability of printing the stored audiogram data or of sending the data to a remote computer through an RS 232 or USB interface. The RS 232 and USB interface a re bidirect ional to allow the operator to transmit test results to a computer and to control the audiometer from a remote computer system. The transmittable data record can be configured to be either a single value (threshold and frequency) or battery transfer (all stored parameters for a patient).

1761-0100 Rev. B

1-1

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

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1-2

1761-0100 Rev. B

Chapter 2

Installation

External Inspection

Although this GSI 61 Clinical Audiometer was carefully tested, inspected and packed for shipping, it is good practice after receiving the instrument to immediately examine the outside of the container for any signs of damage. Notify the carrier if any damage is observed.

Unpacking

Carefully remove th e GSI 61 from its shipping container. If the instrument appears to have suffered mechanical damage, notify the carrier immediately so that a proper claim can be made. Be certain to save all packing material so that the claim adjuster can inspect it as well. As soon as the carrier has completed the inspection, notify a Grason-Stadler representative.

If the instrument must be returned to the factory, repack it carefully (in the original container, if possible) and return it prepaid to the factory for the necessary adjustments.

Check that all accessories itemized below are received in good condition. If any accessories are missing, a Grason-Stadler representative should be notified immediately.

Installation

See the Specifications Section of this manual for the catalog numbers of accessories and also for a listing of the optional accessories.

Accessories Supplied

Test Microphone / Monitor Headset

Patient Talkbac Microphone

Patien

Handswitch

Response

Test Headset Assembly

Bone Vibrator Assembly

Not Shown: For Sound Booth use:

her

1761-0100 Rev. B

Handswitch Patch Cord (1) Bone Vibrator Patch Cord (1) Earphone Patch Cord (2)

Instruction Manual.....Power Cord and

GSI Suite CD

2-1

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Connectors, Controls and Indicators Rear Panel

R1 - Monitor Headset

R2 - Ext A and Ext B

The connectors on the rear panel of the GSI 61 are shown in the following diagram. The label and jacks are visible looking down onto the instrument, behind the LCD.

R9 R8 R7 R6 R5 R4 R3 R2 R1

(Modular Phone Jack)

Pin Function

Mic High and +6 VDC 0.2 to 6.0 mV RMS 1.8 K ohm (output)

Phone Low GND 0 ohm

Phone High 3.0 mV to 1.0 V 300 ohm

Mic Shi eld GND 0 ohm

(RCA plug)

Output Voltage

Impedance

R3 - Talkback Microphone

R4 - Left and Right Ear

Phone Outputs

R5 - Left and Right

Input jacks for optional stereo tape cassette or CD player.

Voltage range required: 0.2 to 1.0 V to obtain 0 VU Input Impedance: 15 K ohm

(3.5 mm stereo jack)

Position Function

1 Tip Mic High 0.2 to 2.0 mV RMS and +6V AC 10 K ohm 2 Ring Mic Low - - - - - - - - - - 3 Shield Chassis Ground - - - - - - - - - -

(1/4 inch stereo jack)

Stereo phone jacks for left (blue) and right (red) earphones, patch cords, or High Frequency earphone connector cords.

Voltage: 1µV to 7.0 V RMS (4.45 V RMS for High Fre qu en cy ) Output impedance: 5 ohms or less

(1/4 inch monaural jack)

Output Voltage

Impedance

2-2

1761-0100 Rev. B

Chapter 2 - Installation

Insert Phone Outputs Monaural phone jacks for left and right insert phones or patch cords.

Voltage: 1µV to 4.0 V Output impedance: 5 ohms or less

Note: When the Single Insert Phone option is used, it must be plugged into the left

insert phone output.

R6 - Bone Vibrator (1/4 inch phone jack)

Jack for bone vibrator or gray patch cord.

Voltage: 200 µV to 5.00 V RMS Output impedance: 5 ohms or less

R7 - Subject (1/4 inch phone jack) Response Handswitch Accepts plug from the cable attached to the patient’s response handswitch or

handswitch patch cord.

Pin Function Voltage Impedance

1 Shield GND 0 ohm 2 Digital GND GN D 0 ohm 3

Response input +5V/GND 1K ohm/0 ohm

R8 - CD Player Power (2 pin power jack) Jack

Provides 5 V DC for CD Player.

R9 - Dip Switch/Cal An eighth position bank of switches accessible by an authorized service representative. Switch

R10 – Speakers (5 pin Din connector) Located on rear of instrument.

Connects to left and right loudspeakers.

Pin Function Impedance

Left speaker (high) 1.0 ohm

Left GND 0 ohm

Right speaker (high) 1.0 ohm

Left speaker (low) 1.0 ohm

Right speaker (low) 1.0 ohm

SHLD Right GND 0 ohm

1761-0100 Rev. B

2-3

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Left Side Panel

Right Side Panel

Please Note:

The connectors on the left side panel are shown below.

The power entry module is composed of the power switch, fuse drawer and voltage selection switch, and power cord with hospital grade plug appropriate for the country of destination.

When turned ON, the GSI 61 automatically initializes and displays a screen which states the type of audiometer (IEC and ANSI specified for speech audiometry) followed by a status screen. With the status display, the GSI 61 is brought to the initialization state.

The frequency is set at 1000 Hz and:

Channel 1 Channel 2

Steady tone NB Noise Phone-Right Phone-Left 0 dB HL -10 dB HL

Serial Port

This instrument has Remote and Printing capability, or t h e f o l l o wi n g connectors will be visible on the right side panel of the GSI61:

Depending on the date product configuration purchased, the GSI 61 is either equipped with a Serial Port, a USB Port, or no Remote port at all.

RS 232 Remote Port

USB Remote Port Printe

USB Printer Port DIP Switches

2-4

Port

RS232

Printer Port

Dip Switches

Remote Port

Remote/Printer Option

A mini-DIN connector uses a standard Apple “Hayes Modem” cable (supplied) to provide serial connection to th e equi pment.

A Standard A/B USB cable provides connection to a PC.

A 25-pin PC-Printer Interface Connector. Connects to t h e printer via a standard PCparallel printer cable.

A Standard USB cable provides connection to a printer. See Chapter 6 for more For more detail on these DIP switch settings, and attaching and using a printer , refer to

the Optional Accessories section beginn ing on page 2-18.

1761-0100 Rev. B

Front Panel Controls

The controls on the front panel of the GSI 61 are shown below.

Chapter 2 - Installation

Attenuators (HL Controls) Channel 1 and Channel 2

dB Ste

Size

The GSI 61 contains two independent HL rotary controls for test signal and masking intensity l evel control with a ra nge of -10 dB HL to 120 dB HL (If the High Frequency option using Sennheiser earphones is installed and active, the High Frequency intensity level control ranges from -20 dB HL to 1 10 dB HL). Maximum dB HL values appl y to the mid-frequencies with earphones only. Refer to the specific transducer for dB HL limits in the Table on page 2-24.

These pushbuttons allow the operator to change the intensity step size to 1.0, 2.0 or

5.0 dB. When the GSI 61 is powered up, the dB step size is automatically set to the .

default of 5 dB increments

These pushbuttons are also used to select the intensity

increase when testing in the SISI mode.

1761-0100 Rev. B

2-5

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Signal Format (Frequency Modulation or Warble Tone) Selectors FM - This pushbutton enables pure tones to be warbled at a rate of 5 Hz with a ± 5%

allowable deviation around the selected center frequency. FM is available in all pure tone test modes, including SISI, Pulsed, ALT and High Frequenc y (optional).

Pulsed - This pushbutton causes the tone to be pulsed at the rate of 200 msec ON, 200 msec OFF. Note that the Pulsed tone is not available in SISI or ALTernate test conditions. When a speech test mode is activated, Pulsed is no longer activated.

Alternate - This pushbutton locks both channels together and alternates the tone presentation between the two channels: 400 msec ON Channel 1, 400 msec OFF Channel 1, 400 msec ON Channel 2, 400 msec OFF Channel 2. Both channels receive TONE as the input stimulus. The frequency is automatically set to 1000 Hz and the dB step size, HL settings and the routing reflect the conditions prior to the selection of ALTernate test type. The tones can be manually presented by depressing either PRESENT bar or automatically presented by pressing either INTERRUPT button. The intensity of the tones can be adjusted independently by use of the Channel 1 and Channel 2 attenuators.

SISI - This pushbutton provides an intensity increment every 5 seconds to a steady or FM tone in the selected channel for 200 milliseconds. The SISI test may be run at step sizes of 1.0, 2.0 or 5.0 dB. When SISI is selected, the GSI 61 automatically initializes Channel 1 to receive tone and Channel 2 to receive NB noise. The step size is initialized to 5.0 dB but may be changed to either 1.0 or 2.0 dB at any time during the test. Channel 1 and Channel 2 are set to 0 dB HL; the frequency is set to 1000 Hz. Output transducer and routing reflects the state of the GSI 61 prior to the selection of SISI. Depress the Interrupt pushbutton to allow the SISI increments to be presented every 5 seconds. Press the Interrupt button a second time to terminate the SISI presentation. (Operating the Channel 2 tone bar with Interlock selected in SISI also terminates the SISI increment presentation).

In order to deselect the preselected signal format, change to any non-compatible test stimulus or push the same signal format again. The following table illustrates the compatibilities of test stimulus and signal formats.

VALID SIGNAL FORMATS / STIMULUS COMBINATIONS

TONE

MIC

PULSED

ALT

SISI

EXT A

EXT B

NBN

SPEECH

WHITE

V =Valid combination of signal format and stimulus. X = Invalid combination of signal format and stimulus. * = When White/White is selected stimulus, calibration for White noise will

be for speech.

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Chapter 2 - Installation

Stimulus Channel 1 Tone — The Tone pushbutton allows the selection of a pure tone presentation for and Channel 2 air/bone conduction testing with the choice of four transducer types; Phone (both the

standard TDH 50P and the optional High Frequency earphones), Bone, Speaker, or Insert. When Tone is selected, Narrow Band Noise automatically routes to the opposite channel if the stimulus type on the opposite channel is not compatible with Tone. Note that the selection of Tone on one channel and Mic on the opposite channel is a valid combination. This setting allows the operator to have contact with the patient, especially a young child, without the need to select Talk Forward.

Mic — The Mic pushbutton provides input capability from the test microphone for live-voice testing with the choice of four transducer types: Phone, Bone, Speaker, or Insert. When Mic is selected, Speech Noise automatically routes to the opposite channel if the stimulus type on the opposite channel is not compatible with MIC. Note that the selection of Mic on one channel and Tone on the opposite channel is a valid combination. This setting allows the operator to have contact with the patient, especially a young child, without the need to select Talk Forward.

Ext A, Ext B — External A and External B accept recorded speech material from an optional compact disc player, a two channel tape cassette or a reel-to-reel tape recorder . When Ext A or Ext B is selected on one channel, Speech Noise automatically routes to the opposite channel if the stimulus type on the opposite channel is not compatible with Ext A or Ext B. Note that the selection of Ext A, or Ext B, on one channel and Tone on the opposite channel is a valid combination.

Narrow Band Noise — The NB Noise pushbutton selects narrow band noise. This is a noise centered at each test frequency and available for all frequencies with a 3 dB down bandwidth of greater than octave but less than ½ octave. The maximum dB HL is 15 dB below the maximum pure tone level and is calibrated in effective masking.

Speech Noise — The Speech Noise pushbutton selects speech noise. This is a white noise filtered to a low and middle frequency band, simulating the average

spectrum of conversational speech

Speech noise is calibrated in effective masking level and consists of equal energy per frequency from 250 to 100 Hz with a 12 dB/ octave roll-off from 1000 to 6000 Hz. The maximum dB HL for speech noise is equal to the maximum HL for the speech type signals in each transducer.

White Noise — This pushbutton selects White Noise. White noise is a broad band signal containing acoustic energy at all frequencies between 125 Hz and 12000 Hz. White noise is calibrated for pure tone effective masking if a tone type signal is selected on the opposite channel, and for speech effective masking if a speech type signal is selected on the opposite channel. The maximum HL for white noise selected with a tone signal is 35 dB below the maximum pure tone level. The maximum HL for white noise selected with a speech signal is equal to the maximum HL for the speech signal.

Refer to the following table for the stimuli compatibilities listing.

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Valid Stimuli Combinations

Channel 1 Stimulus

Mic

Ext A

Tone

Ext B NBNoise S Noise White Noise*

* If White Noise is selected on both channels, then calibration is made to speech. If White Noise is selected on one channel only, calibration will be made to the stimulus type on the opposite channel.

Transducer Output Selector

Channel 2

Stimulus

Tone

Mic

Ext A

Ext B

NBNoise

S Noise

W Noise*

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid

Invalid

Valid*

These pushbuttons allow the easy selection of the transducer for each stimulus available for Channel 1 and Channel 2. A transducer selection may be changed at any time.

Valid Transducer Combin ation s

Channel 1

Bone

Speaker Insert

Valid

Channel 2

Phone

Bone

Speaker

Phone

Valid

Routing Output Selector

Tone Bar / Interrupt

Insert

Valid

These pushbuttons allow the easy selection of the routing from the stimulus to the output transducer available for Channel 1 and Channel 2. When first powered on, the routing for Channel 1 will be right and the routing for Channel 2 is left. Left/ Right mixes the stimuli from both channels to each transducer and drives both the left and right transducers with the combined signal. Both the Channel 1 and Channel 2 maximum dB HL limits in mixing are appropriately decreased from the non-mixed maximum dB HL limits. Left/Right -Left/Right routing is restricted to Phone/Phone, Speaker/Speaker and Insert/Insert (paired insert option). Left/Right routing is invalid for bone and the single insert phone.

Each tone bar operates independently to present the selected stimulus for as long as the bar is depressed. The channel turns off immediately when the bar is released. When ALTernate is selected and the tone bar is released, the complete presentation of both channel signals is completed. These pushbuttons determine the status of the respective tone bars and operate independently of each other. When the Interrupt is in the off position, the corresponding channel is activated by depressing the Tone bar bar and deactivated by releasing the Tone bar. To turn on the Interrupt, press the pushbutton. When Interrupt is in the on position, the corresponding channel is deactivated by pressing the Tone bar and activated by releasing the bar. When Interrupt active, an icon is displayed on the LCD. Note that in the ALTernate test mode, the Interrupt pushbuttons do not operate independently of each other.

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Interlock This pushbutton locks both tone bars together so that operating one channel will also

operate the other, according to the status of the Interrupt buttons. To unlock the Tone bars, press the Interlock button again. When the Interlock is active, a message is displayed on the LCD.

Save This pushbutton, when pressed, saves the current dB HL level representing the

threshold level, and effective masking level if selected, transducers and routing. In the Display Audiogram format, the appropriate symbol appears for each Save press.

Tracking

This pushbutton allows the Channel 2 hearing level to track the Channel 1 hearing

level by a selected dB difference. When in Tracking, any dB change to the Channel 1 HL causes the Channel 2 HL to change by the same amount, until the limit of the Channel 1 transducer is reached. If the dB HL limit is reached in Channel 2 before Channel 1, the Channel 2 dB HL display will temporarily flash and remain at this level. Tracking remains on. When the Channel 1 dB returns to a level at which the selected difference between the two channels can resume, Channel 2 again tracks Channel 1. Tracking is in the off state upon initialization of any test type. When tracking is selected, it is possible to manually change the intensity of Channel 2 to alter the dB difference between the two channels without deselecting Tracking. To exit T racking, press the button again. When T racking is active, a message is displayed on the LCD.

Frequency Up/Down These pushbuttons allow the choice of twelve standard audiometric frequencies: 125

Hz, 250 Hz, 500 Hz, 750 Hz, 1000 Hz, 1500 Hz, 2000 Hz, 3000 Hz, 4000 Hz, 6000 Hz, 8000 Hz and 12000 Hz. If the high frequency option is activated, these pushbuttons allow a choice of nine high frequencies: 8 kHz, 9 kHz, 10 kHz, 1 1.2 kHz, 12.5 kHz, 14 kHz, 16 kHz, 18 kHz, and 20 kHz. Each press of the right (R) pushbutton selects the next higher frequency. Each press of the left (L) pushbutton selects the next lower frequency. The new frequency is selected when the pushbutton is released. When at the lower limit of the frequency selection, pressing the (L)pushbutton will cause the display to roll over to the highest frequency limit, and vice versa. If a transducer with a narrower range is selected, only valid frequencies for that transducer are available.

See the Table entitled “dB HL Limits per Frequency and T ransducer” in the Hearing Limits and Frequency Levels Section (pages 2-24 and 2-25) for the allowable frequency ranges of the specific transducers.

Talk Forward Pressing this pushbutton allows the operator to speak directly to the patient through

the microphone at the level set by the Talk Forward control by interrupting the stimulus presentation. Talk Forward can be used with any available transducer , including the optional High Frequency earphones. While Talk Forward is on, the only control which can be activated is the Print, if available. The GSI 61 resumes the test status held prior to pressing the Talk Forward pushbutton when the pushbutton is released.

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Scorer/Timer The Correct, Clear and Incorrect pushbuttons are used for scoring results in Speech,

ALTernate or SISI tests. The scorer is displayed in the test status area of the Status screen. When Speech, SISI or ALT is selected, the scorer initializes to 0/0 = 0%. The operator presses the Correct or Incorrect pushbutton after each presentation, depending on the response. The display indicates the number of correct responses and the total number of presentations along with the percentage of those correctly identified. The display clears with the pressing of the Clear pushbutton.

During tone tests (excluding ALTernate and SISI), the Scorer/Timer pushbuttons may be used to start, clear and stop the timer. The timer is displayed in the test status area of the Status screen. When the timer is first selected, it initializes to 0:00 (0 minutes: 00 seconds). The timer starts when the Start pushbutton is pressed. Times up to 199 minutes and 59 seconds may be displayed before the timer resets to 0:00. The timer may be halted at any point by pressing the Stop pushbutton. The stopped time is displayed.

Upon pressing the Start pushbutton after the Stop

pushbutton, timing is resumed from the currently displayed value. Pressing Clear while the timer is running is invalid. Pressing Clear after Stop resets the timer to 0:00.

Displays These pushbuttons are used to select the format for the screen display format on the

LCD.

Display Status — When the Display Status pushbutton is pressed, the display is formatted as shown in the following Figure: Front Panel Display - Status. This display indicates the current instrument state and VU meters.

Display Status

Display Audiogram — When the Display Audiogram pushbutton is pressed, the display is formatted as shown in the following Figure: Front Panel Display -Audiogram. Two audiograms with the standard range of frequencies (125 Hz to 12,000 Hz), or the High Frequency ranges (8 kHz to 20 kHz), and the instrument status are displayed. Hold the Display Status key for 2.5 seconds to view the left audiogram on the left side, and right on the right side. Hold the Display Status key again to reverse back to the original setting..

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Chapter 2 - Installation

Display Audiogram

High Frequency — When the High Frequency pushbutton is pressed with the High Frequency option installed, the system allows tone testing in the extended range from 8 kHz to 20 kHz. The display remains in the Display Status or Display Audiogram format as previously selected. If the High Frequency option has not been installed and the pushbutton is pressed, the error message “Not Available” appears in the error message area of the display.

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Display High Frequency

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Print Audiogram If the printer option is available and the Print Audiogram pushbutton is pressed, the

current saved test information in audiogram format is sent to the printer. If there is no data stored in the GSI 61 memory and the Print Audiogram pushbutton is pressed, the message “No Test Data Stored” appears in the error message area. If the printer option is not active and the pushbutton is pressed, the message “Not Available” appears.

Remote

When the Remote (RS232 or USB) option is installed, pressing the Remote pushbutton allows the GSI 61, when connected to an external computer, to transmit and receive data from this device. If the option is not installed and the pushbutton is pressed, the message “Not Available” appears.

Data Transfer

When Remote is enabled and the Data Transfer button is pressed, a data record containing the stored test data in a previously selected format is transmitted to a remote device. Data may be transferred point-by-point or as a complete battery of all saved test results. The data transfer format is set by an authorized GSI Service Engineer. If the pushbutton is pressed when the Remote option is not active, the message “Not Available” is displayed.

Data Erase When the Data Erase pushbutton is pressed for at least 0.5 second, all of the stored

test data in the GSI 61 is erased and the message “Erasing Data” is displayed on the LCD. If no data is stored in the GSI 61 memory, the message “No Test Data Stored” is displayed.

Contrast

This rotary control is used to set the brightness of the LCD.

Mic, Ext A and Ext B Level Controls

These rotary controls are used to adjust the signal intensity from the test microphone or the external devices, so that the level reflects accurately on the VU meters on the Status display. These inputs are adjusted by turning the appropriate control until an indication of 0 dB on the average is obtained on the selected channel VU meter.

Note: it has been suggested that for live voice speech testing, the operator should calibrate the GSI 61 to a 1000 Hz pure tone introduced into the microphone. When using an external source, calibrate to the 1000 Hz pretest tone.

Talk Forward Level Control

This rotary control allows the operator to adjust the intensity in a continuous range of 45 to 90 dB HL when givin g the subject instructions through use of the Talk Forward function. The level select ed by this control is calibrated to the transducer currently being used with the subject.

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Chapter 2 - Installation

Monitor Controls The Monitor Headphone or Speaker allows the operator to listen to the stimuli as

they are presented or to listen to the patient’s comments through the talk-back system. The Channel 1 and Channel 2 rotary controls adjust the intensity of the sound presented through the monitor headphone or speaker. The Talkback rotary control adjusts the intensity of the patient’s voice. The Monitor Spkr pushbutton is used to turn on the Monitor Speaker. When Mic is selected, or when the Talk Forward is operated, that channel’s input to the monitor speaker is disabled to reduce acoustic feedback.

Power This Power Monitor green light emitting diode (LED), located in the upper left portion

of the keypanel, is illuminated when power is supplied to the GSI 61.

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Displays

A Liquid Crystal Display (LCD) is hinged to the GSI 61 and is used to display all of the testing information from the instrument. When the LCD is in the lowered position, easy access to the rear connector panel is provided.

The data from the GSI 61 is provided in two formats, Instrument Status and Audiogram. The following figure shows the Instrument Status screen.

{

b. c.

d. e.

f. g.

{

}

The output, in dB HL, for Channel 1 and Channel 2. A graphical representation of the VU meters for each channel. The tone ON icon which is displayed when the presentation is made. The stimulus, transducer and routing currently selected for each channel. If the Interrupt is on, this is also displayed in this area. Frequency, in Hz, selected for Channel 1 or Channel 2. The indicator bar for the subject response displays when the handswitch is depressed. When a speech type condition is selected, this area is blank. Timer/Scorer. General system state, including tone presentation format, dB step size, special tests, monitor speaker, High Frequency (optional), Remote (optional) with data transfer, and print (optional). Error messages/status messages. Refer to Chapter 7 for a description of the error and status

}

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1761-0100 Rev. B

Chapter 2 - Installation

The following figure is a representation of the standard audiogram.

f / g

12345678901234 12345678901234

{

}

andard Audiogram

a. Frequency, in Hz, selected for Channel 1 or Channel 2.

b. The indicator bar for the subject response displays when the handswitch is pressed. c. The saved dB HL (and effective masking level) for the intersected frequency and

Hearing Level.

d. Current output in dB HL for Channel 1 and Channel 2; also the stimulus, transducer

and routing currently selected for each channel. If the Interrupt is on, this is also displayed in this area. The tone ON icon is displayed when the presentation is made.

e. The general system state, including signal format, dB step size, special tests, monitor

speaker, High Frequency (optional), Remote (optional) with data transfer, and print (optional).

f. The graphic represent ation of the audiogram. The display is designed so that the

patient’s right ear audiogram will be on the operator’ s left portion of the display . The left ear is on the right side of the display. In the above figure, the x axis is labeled Left Ear or Right Ear Frequency (Hz) and is marked at the octave intervals of: 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz and 8 kHz. The dashed grid lines are displayed at the one-half octave intervals of: 750 Hz, 1.5 kHz, 3 kHz, 6 kHz, and 12 kHz. The y axis is Hearing Level in dB HL. This ordinate is incremented every 10 dB, starting at -10 dB and ending at 120 dB.

g. When a result is saved, the appropriate audiometric symbol is located on the audiogram.

No Response symbols are placed on the audiogram at the maximum output limit for the transducer and frequency combination.

h. Error message/status message. Refer to Chapter 6 for a description of the error and

status messages. These boxes appear o nly when a message is displayed.

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

In the next figure, High Frequency Audiogram, the x axis is labeled Right Ear or Left Ear Frequency (kHz) and is marked at the frequency levels of 8 kHz, 10 kHz

12.5 kHz, 16 kHz, and 20 kHz. The dashed grid lines are displayed at the intermediate frequencies of 9 kHz, 11.2 kHz, 14 kHz and 18 kHz. The y axis ordinate is incremented every 10 dB, starting at -20 dB HL and e nding at 110 dB HL. A crosshair, spanning the length and width of the audiogram, shows the current frequency and dB level for the ear under test.

High Frequency Audiogram

Audiometric Symbols

Left Ear

Right Ear

Response No Response Description

Response

No Response Description

Air conduction, unmasked, phone or insert

Air conduction, masked, phone or insert

Bone conduction, m astoid, unmasked

Bone conduction, m astoid, masked

Bone conduction, forehead, masked

Air conduction, unmasked, phone or insert

Air conduction, masked, phone or insert

Bone conduction, m astoid, unmasked

Bone conduction, m astoid, masked

Non-ear Specific

2-16

Response

Bone conduction, forehead, masked

No Response Description

Bone conduction, forehead, unmasked

Sound field, aided or unaided

1761-0100 Rev. B

The selection of any stimulus will deselect a previously selected stimulus on the opposite channel if the stimuli are not compatible.

T est Microphone/Monitor Headset

The lightweight test microphone/monitor headset supplied with the GSI 61 provides the operator complete comfort and utility.

A standard microphone is positioned at the end of the adjustable boom. The microphone boom rotates 225 degrees so that the microphone may be worn on either the right or left side of the head.

Chapter 2 - Installation

Place the headset on the head by spreading the headband slightly. Then locate the receiver directly on the ear and slide the headband to adjust the fit. The microphone must be positioned close to the tester ’s mouth so that the filter is almost in contact with the lower lip. The white dot on the base of the microphone must face the tester’s mouth.

The GSI 61 permits the operator to speak through the test microphone into the test transducer at continuously variable intensities from 45 dB HL to 90 dB HL in the Talk Forward mode. The tester’s lips maintain a constant distance from the microphone enabling the VU meter to uniformly average at 0 dB for live voice testing.

A lapel clip and a 10 foot coiled cord with a quick disconnect are included. The telephone jack connector attaches the test microphone/monitor headset to the rear panel.

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Optional Accessories

E•A•RTONETM Insert Earphone Set

Single Insert Phone

There are two insert earphones options available for use with the GSI 1. The first option is the paired E•A•R TONE

Insert Earphone Set which allows for the use of these insert phones in

addition to the TDH 50P earphones. The phones are connected to the panel

on the rear of the GSI 61 in the position labeled Insert Left and Insert Right

The use of these insert earphones is

recommended in order to minimize collapsing of the ear canals while reducing the occlusion effect seen in bone conduction testing when the ear is covered. Insert phones are ideal for hearing aid evaluations where they can used to accurately simulate situations for speech testing of hearing aided patients. Noise exclusion is improved at low frequencies where background noise may be a problem. These insert phones may be used with tone (125 Hz to

8000 Hz), speech and noise signals.

The second insert phone option is a single phone. This insert may be used with tone (250 Hz to 6000 Hz), speech and noise signals.

Printer

Note: When the single insert option is used, the insert phone is connected to the rear of the GSI 61 at the Insert Left position.

An optional color or black-and-white printer may be attached to the GSI61 to allow printing of the audiometric test results. This option may b e factor y installed on the GSI 61. In addition to a choice of color or black-and-white, a choice of separate left and right or overlaid left and right audiograms is provided.

The GSI 61 supports most HP (Hewlett Packard) DeskJet Series Printers that use PCL-3. Contact GSI Service for specific models

The Remote/Printer board option includes a set of external DIP switches which enable the operator to reconfigure the printer color and the audiogram format. The board is located on the right side, near the rear of the instrument. Refer to the figure on page 2-4. The switch definitions are as follows:

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Chapter 2 - Installation

DIP Switches Audiogram Format

Dip switch 1 Selection

OFF Separate Left and Right Audiograms ON Overlaid Left and Right Audiograms

Printer Color

Dip switch 2 Selection

OFF Color Printing ON Black and white Printing

Dip switch 3 Not Used.

Print Bar Code

Dip switch 4 Selection

OFF Print bar code O N Do not print bar code

Parallel Port The Remote/Printer board has a standard “PC-type” parallel printer port. The printer

is connected to this port with a standard “PC-type” parallel printer cable.

User Interface

Printing Pressing the PRINT AUDIOGRAM pushbutton on the front panel of the GSI 61

will send the stored threshold data to the printer. If turned ON, a bar code will be printed with the audiogram. The bar code can be used to quickly input data with AudioScan systems.

Cancel the Print Printing may be cancelled by pressing the PRINT AUDIOGRAM pushbutton a

second time while the “Printing” message is displayed. A “Printing Cancelled” message will then flash on the display.

Multiple Copies Additional copies of the audiometric test results are printed each time the PRINT

AUDIOGRAM pushbutton is pressed, after the “Printing” message disappears from

the display .

Instrument while Printing

Operation The GSI 61 remains operational while printing with the following exceptions: pressing

the Data Erase, Save, Data Transfer and Remote pushbuttons will result in the

error message “Invalid Selection.”

Remote Operation/

The Remote port operation is inactive while audiometric test results are being printed.

RS 232 or USB Interface

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Error Messages The GSI 61 displays error messages when the PRINT AUDIOGRAM pushbutton

is pressed when the following conditions exist:

If there is currently no saved data, this error message will be flashed:

No T est Data Stored

If test data exists, the presence of the Remote/Printer Option board is verified; if it is not present, this error message will be flashed:

Not Available

If the Remote/Printer Option board is present, a check will be done to see if a print job is already in progress. If so, it will be cancelled. If the Remote is currently in use, this error message will be flashed:

Invalid Selection

If all of the above is satisfied, a check is done to see if the printer is connected and ready to receive data. If not, this error message will be flashed:

Check Printer

When all of the above is satisfied, an informational message is displayed while outputting data to the printer:

Printing

If, during the course of printing, communications problems occur, this error message will be flashed:

No Printer Response

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Printer Output Formats The printout formats are shown in the following four figures.

Low Frequency Dual Audiogram Format

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Low Frequency Combined Audiogram Format

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

High Frequency Dual Audiogram Format

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High Frequency Combined Audiogram Format

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High Frequency

It is an option to include high frequency audiometry on the GSI 61. The High Frequency earphones are connected to stereo cable extensions which, in turn, are connected into the Right and Left phone jacks on the rear panel. When the High Frequency option is installed, connect the standard TDH 50P earphone cords into the stereo cable extensions labeled Std. The following two figures show the installation of the High Frequency and THD 50P earphones. When the Sennheiser High Frequency phones are used and the High Frequency option is enabled, the frequencies available for testing are 8 kHz, 9 kHz, 10 kHz, 11.2 kHz, 12.5 kHz, 14 kHz,

16 kHz, 18 kHz and 20 kHz. The intensity range is from -20 dB to 110 dB HL. High Frequency audiometry can also be performed in Sound Field using the Basic Speakers configuration. In High Frequency Sound Field, the frequencies of 8 kHz, 9 kHz, 10 kHz, 11.2 kHz, 12.5 kHz, 14 kHz, 16 kHz are available.

TDH-50 Low Frequency Phones

Sennheiser High Freq. Phones

High Frequency Option Setup: No Sound Booth

TDH-50 Low Frequency Phones

Sennheiser High Freq. Phones

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High Frequency Option Setup: With Sound Booth

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Hearing Level and Frequency Limits

Hearing Level (dB HL)

It is not possible to select a dB HL value outside the limits for a particular transducer/ frequency combination. An attempt to change or select a hearing level control that is outside of the limit will result in the following:

1. The dB HL will stop at the limit value, or

2. The dB HL will go to the nearest allowable level.

In either case, the dB HL display will flash momentarily and then the test channel value will be replaced with NR (No Response). If an audiogram is displayed and the limits for a frequency/transducer are reached, the symbol for no response is displayed in the audiogram. When Speaker is selected on both channels and the optional booster amplifier is not installed, it is possible to increase Channel 2 to a higher hearing level if Channel 1 is lowered. For example, select SPKR/SPKR, 1000 Hz, Tone/Narrow Band, and Left for Channel 1 and Right for Channel 2. Set both Channel 1 and Channel 2 at the maximum dB HL levels. If Channel 1 is lowered by 5 dB, it is possible to then increase Channel 2 by 5 dB.

Frequency Limits

It is not possible to select a test frequency that is invalid for a particular transducer. The Test Frequency buttons will roll over to the lowest frequency after the last valid frequency or the frequency will automatically go to the nearest valid value when a different transducer is selected.

dB HL Limits per Frequency and Transducer

75 100 105 105 105 105 105 105

1761-9639

Sound

Field

Azimuth

90 110 110 110 110 115 115 115 105

High

Frequency

Phone

100

Test

Ear

Signal, Phone Vibrator- Vibrator- Tone

Pure

Tone

125

250

105

500

120

750

120

1000 120 1500 120 2000 120 3000 120 4000 120 6000 110 8000 100

12000

Bone Bone E A R

Mastoid Forehead 3A Insert

N/A

Phone

90 100 110 115 115 115 115 115 115 105

90 N/A

Single 1761-9630 1761-9635

Insert

Sound Sound

Field Field

70 65

95 100 100 100 100 105 105

Azimuth

Phone

N/A 100 110 110 110 110 110 110 105

N/A N/A

Speech 1052

2-24

110

102

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Chapter 2 - Installation

dB HL Limits per Frequency and Transducer continued

Test

Ear

Bone

Mastoid

Signal,

Pure Tone

Speach

Noise

9000

10000 11200 12500 14000

16000 18000 20000

Phone Vibrator-

105

Notes:

1. The High Frequency Phones specified are the Sennheiser HDA 200 Phones.

2. The maximum hearing level for speech with the speech filter in place is 100 dB.

Bone

Vibrator-

Forehead 3A Insert

E A R Single 1761-9630 1761-9635 1761-9639

Tone Insert Sound Sound Sound

Phone

105

Phone Field Field Field

Azimuth

80 80 80 80 80 75

50 N/A N/A

Azimuth Azimuth

96 N/A N/A N/A N/A N/A N/A N/A N/A

92 N/A N/A N/A N/A N/A N/A N/A N/A

High

Frequency

Phone

N/A 100

95 95 84 75 55 33 14

Note: The hearing levels listed in this table are guaranteed maximum levels. These levels are guaranteed only if ANSI, ISO or GSI reference threshold levels, and not customized calibration values, are used. The GSI 61 provides hearing level limits to at least the values listed. However, at no time will the hearing level lim it exceed 120 dB HL.

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Initial Installation

Elimination of Ambient Noise

The GSI 61 can be installed in a single room environment or as part of a two room

suite

Excessive noise in the test environment, such as that produced by conversation, typewriters, printers, or other machines reduces test validity because it tends to mask the test signals, particularly at the lower frequencies where earphone cushions provide less effective attenuation. A room that attenuates sound may be required if ambient noise at the patient’s ears reaches levels sufficient to cause apparent hearing loss at the lower frequencies.

Maximum permissible test environment sound-pressure levels are specified by American National Standard Criteria for Permissible Background Noise during Audiometric T esting, Section 3.1. The following table shows the maximum background levels that can be present inside the room while a valid hearing test is being conducted. These values apply for hearing threshold measurements to 0 dB HL.

Maximum Ambient Noise

Test Tone Freq. (Hz) 125 250 500 750 1000 1500 2000 3000 4000 6000 8000

Test Room level max dB SPL, ears covered 29.0 17.5 14.5 16.5 21.5 21.5 23.0 28.5 29.5 33.0 38.5

Max level dB SPL, ears not covered 23.0 13.5 9.5 7.5 9.0 5.5 3.5 3.5 4.0 9.0 15.5

Notes:

Maximum permissible 1/3 octave band level If the Hearing Level to be measured is -10 dB HL, then 10 dB should be subtracted from the levels listed in this table.

Note: A room providing sound isolation from am bient noise is highly recommended so that hearing threshold values may be obtained. If a separate examination (sound) room is used, it is considered sufficiently quiet for the purposes of these tests if a group of otologically “normal” listeners with their ears occluded is unable to detect any ambient noise during the test period. See ANSI S3.1 Criteria for Permissible Ambient Noise during Audiometric Testing for maximum allowable outside octave band noise levels with three prefabricated sound room types.

Note: Live voice testing requires a separate sound attenuated room for the patient in order to avoid feedback and direct transmission of the test stimuli.

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1761-0100 Rev. B

Chapter 2 - Installation

Single Room Environment

Place the GSI 61 on the desk or table where it will be used. The location should be near a grounded electrical outlet which is needed to accommodate the GSI 61 power cord. Allow a minimum of 2 inches of clearance around the GSI 61 for heat dissipation.

a. Refer to Rear Panel Figure, page 2-2. With the LCD panel in the down

position to allow access to the rear connector panel, connect the following.

• Test microphone/ monitor headset

• External A and External B (if used)

• Power cord for the CD player (if used)

• Patient talk back microphone

• Test headset - red right ear phone, blue left ear phone or the cables for the optional High Frequency phones

• Insert ear phones (optional)

• Bone vibrator

• Patient response handswitch

• Speakers

• Printer

b. To connect the optional high frequency earphones, see the figures on

page 2-23. c. Plug the power cord into a grounded outlet. d. Turn the unit on and observe that the GSI 61 is receiving power.

(The small Monitor Power LED on the front panel is illuminated).

The unit is initialized to T one, Phone, Right, 0 dB HL, 1000 Hz Channel 1;

and Narrow Band Noise, Phone, Left, -10 dB HL, Channel 2. e. Test all of the input and output transducers that will be used during testing

to verify that the signals and communication functions are operating properly.

Two Room Installation

Place the GSI 61 on a desk or table where it will be used. The location should be near a grounded electrical outlet which is needed to accommodate the GSI 61 power cord. Allow a minimum of 2 inches of clearance around the GSI 61 for heat dissipation.

a. Connect the patient response handswitch, the headset, bone vibrator , and optional

insert phone(s) to the connector panel on the inside of the sound room. b. Mount the T alkback m icrophone in the sound room using the hardware provided.

The microphone is usually mounted just above the window frame.

Pass the microphone plug through the grommet hole in the jack panel and connect

directly to the talk back microphone jack on the GSI 61 rear panel (R3).

1761-0100 Rev. B

2-27

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Do not use a patch cord with the Talkback microphone as interference can occur.

c. Use the supplied patch cords to connect the GSI 61 output jacks for all transducers

to the corresponding points in the connector panel on the outside of the examination (sound) room. Refer to the Figures on page 2-23 for the optional High Frequency installation. Plug the monitor headset into the rear panel jack.

Be certain that the transducers connect to the corresponding patch cords through the connector panel.

d. Connect the optional speaker cable to the connector marked Speaker on the rear

of the GSI 61. Pass the other ends of the cable through the grommet holes in the control panel of the sound room. Connect the cable marked “left” to the left speaker, and the one marked “right” to the right speaker.

CAUTION: The wire ends must not touch each other or any other

conductive surface! Do not use patch cords with or instead of the supplied speaker cables. Damage to amplifiers inside the GSI 61 will occur.

e. Mount the speakers in the corners of the sound room. Position the speakers

three feet (one meter) from the patient. The cone of the speaker should be at the same height as the ear of the average patient seated in the normal listening position.

Note: All transducers are pre-calibrated except for the speakers. Contact a local GSI representative to install and calibrate the sound field system.

f. Plug the power cord into a grounded outlet.

g. Turn the unit on and observe that the GSI 61 is receiving power. (The small

power LED on the front panel is illuminated). The unit is initialized to Tone, Phone, Right, 0 dB HL, 1000 Hz Channel 1; and Narrow Band Noise, Phone, Left

-10 dB HL, Channel 2.

h. Test all of the input and output transducers to verify that the signals and

communication functions are operating properly .

2-28 1761-0100 Rev. B

Chapter 2 - Installation

Loudspeaker Installation

The installation of the Basic Speakers, 1761-9630, with the GSI 61 provides a guaranteed maximum level in speech of 90 dB HL (with a 6 ft x 6 ft room, and the patient seated one meter from the speakers).

Note that the High Frequency with Sound Field can only be selected with the Basic Speakers.

Basic Speaker

Cable 90 dB HL

GSI61

Basic Speaker 90 dB HL

Sound Field System 90 dB HL - Basic Speakers and Cable

Frequency Range: 125 to 16,000 Hz

To obtain a maximum level in speech of 96 dB HL, the High Performance Speakers, 1761-9635, may be used.

High-Performance

Cable

Speaker 96 dB HL

GSI61

High-Performance Speaker 96 dB HL

Sound Field System 96 dB HL - High Performance Speakers and Cable

Frequency Range: 125 to 8,000 Hz

For additional output capability (to 102 dB HL guaranteed maximum level in speech) use the High Performance Sound Field System with Booster Amplifier, 1761-9639, as shown below.

Note: The Booster amplifier can only

be used with the High Performance speakers.

Use of the Booster Amplifier with the basic speakers will/can damage the speakers.

Cables High Performance

Cable Booster Speaker

GSI61 Amplifier

145 Watts High Performance

Speaker

Sound Field System 102 dB HL with Booster Amplifier

Frequency Range: 125 to 8,000 Hz

1761-0100 Rev. B

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Blank page.

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1761-0100 Rev. B

Operation

Preliminary Checks

Before starting any procedures using the GSI 61 Clinical Audiometer, ensure that the power cord is plugged in a properly grounded receptacle. Check also that all cords from the tr ansduc ers, handswitch (if used), and printer fit securely in their receptacles on the rear and side panels. If speech testing with recorded voice is to be

erformed, check that the CD or tape unit is connected and operating properly .

Turn on the GSI 61 and allow it to warm up for 10 minutes.

CAUTION!

Chapter 3

Operation

Handle earphones, bone vibrator, and insert earphones with care. Do not drop them nor allow them to be banged together. Severe mechanical shock can alter their operating characteristics which may require that the transducers be replaced.

1761-0100 Rev. B

3-1

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Patient Instructions

Noise Recovery Period

Exposure to high levels of s ound - unm uffled lawn m owers, m any power tools , motorcy cles, rock music, gunfire - tends to create a tem porary threshold shift (TTS) whi ch diminishes with time after exposure. Any patient tested soon after such exposure will manifest a hearing loss that does not accurately reflect the normal hearing threshold. It is important that the testing procedure prescribe some time interval, usually 16 hours, between the high level sound exposure and the actual hearin

Instructing the Patient

Try to put the patient at ease before beginning the proced ure. Explain to the patient:

How the test will be administered.

What he or she should be listening for; explain that the sounds may be different; some may be

soft, some loud.

The purpose of the test is to find the softest tone which can be heard and it is important to

listen carefully. Explain that he or she should respond by raising a finger or hand, or by pressing the handswitch, as soon as the tone is heard. As soon as the tone is no longer heard, the finger/hand shou ld be lowere d or the handswitch should be released.

test.

Inform the patient that each ear will be tested separately, unless otherwise instructed.

Placement of the Earphones

Prior to positioning the earphones on the patient’ s head, inspect the ear canals for any bloc kage due to cerumen or foreign objects. Recognize that soft-walled ear ca nals may collapse under the earphones and this may lead to incorrect threshold levels. Insert phones might be used in these cases. Eliminate all obstructions, such as glasses, hair, or hearing aid, between the earphone and the patient.

Center the earphone over both ears and adjust the headband so that it rests solidly on the crown of the head and exerts pressure on both ears. Place the earphone with the red connector over the patient’s right ear and the earphone with the blue connector over the left ear.

Placement of the Insert Phone

If insert phones are used, push the co rrectly sized eartip onto the earphone and then place the insert phone securely into the patient’s ear. When using the paired E•A•R insert phones, follow the manufacturer’ s recommended procedure for eartip placement and insertion.

Placement of the Bone Vibrator

The bone vibrator m ay be placed on the promont ory of the mastoid process or on the forehead, whichever has been selected for calibrati on.

1761-0100 Rev. B 3-2

Routine Test Procedures

The following procedures are in compliance with the current ANSI and ISO recommendations for Manual Pure Tone Threshold Au diomet ry.

Preliminary

Turn on the instrument and allow it to come to operating temperature.

Check that the transducers and other system components are operating properly.

Seat the patient comfortably in the test area.

Explain the test procedure.

Assist the patient with the earphones or bone vibrator placement.

Patient Familiarization

Select the proper output transducer routing to the desired ear.

Chapter 3 - Operation

Demonstrate the 1000 Hz tone at 40 dB HL (or at a level estimated to evoke a prompt and clear

response) to the patient. The tone duration should be between one and two seconds.

Set the Channel 1 attenuator to -1 0 dB.

Practice: beginning with the tone continuously on, gradually increase the intensity by rotating

the Channel 1 attenuator until a response occurs. Switch the tone off for at least 2 seconds, then present the tone again at the same level. If there is a second response, proceed with a threshold measurement. If the second response does not occur, repeat this step.

Threshold Determination (Pure Tone): Modified Hughson-Westlake

The level of the first presentation should be 10 dB below the level at which the patient responded during the familiarization session. Present the tone for a period of one to two seconds. The time between presentations can be varied, but should not be shorter than the test tone itself. After each failure t o respond to the signal, the level is increa sed by 5 dB until the first response is given. After the response, the intensity is decreased 10 dB and another ascending process is begun.

The threshold is considered to be the minimum intensity setting at which a response has

occurred two out of three times at a single level. Record this setting by pressing the Save pushbutton or by maki ng a notati on on an a udiog ram form.

1761-0100 Rev. B

3-3

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Test Procedure

Test the better ear first.

Repeat the sections on Patient Familiarization and Threshold Determination for each tone setting in the following order: 1000 Hz, 2000 Hz, 4000 Hz, 8000 Hz. Retest 1000 Hz followed by 500 Hz and 250 Hz. If there is a difference of 20 dB or greater between octaves, test the interoctave frequencies, i.e. 750 Hz, 1500 Hz, 3000 Hz, and 6000 Hz. Record these settings by pressing the Save pushbutton with each threshold level.

Repeat this procedure with the other ear.

Determine if masking should be used. The use of masking in the contralateral ear (non-test ear) is indicated if there is a difference in threshold between the two ears of approximately 35 dB or more. If necessary, repeat the testing with masking and again record the testing process.

Spondaic Speech Testing, Speech Reception Threshold (SRT)

Instruct the patient that he or she will be hearing words that have two parts, such as “mushroom” or “baseball.” The patient should repeat the words and if not sure, he or she should not be afraid to guess.

Using either live voice or recorded speech, present the standardized word lists W-1 and W-2 (Appendix 1 in the guide), testing the better ear first. Start 20 dB above the 1000 Hz pure tone threshold level. Present one word on the list and, if the response is correct, lower the level by 2 dB. Continue until the patient has difficulty with the words. When this occurs, present more words for each 2 dB step.

The Speech Reception Threshold (SRT) is recorded at 2 dB above the level at which the patient cannot repeat any words correctly.

Speech Discrimination (PB Words)

Instruct the patient that he or she is to repeat the words presented.

Using either live voice or recorded speech, present the standardized PB word list W-22 (Appendix 1 in this guide). Present the words at a level comfortable to the patient; at least 30 dB and generally 35 to 50 dB above the 1000 Hz pure tone threshold. Using the scorer buttons on the front panel, press the “Correct” button each time the right response is given and the “Incorrect” button each time a wrong response is given.

The Discrimination Score is the percentage of words repeated correctly: Discrimination % at HL = 100 x Number of Correct Responses/Number of Trials.

3-4

1761-0100 Rev. B

SpecialTest Procedures

Special Test Procedures

This section describes some special test procedures that can be used with the GSI 61 Clinical Audiometer.

The flexibility of the GSI 61 allows for preference choices in test setup and operations. operator makes the channel, routing, transducer and presentation mode selections which are appropriate to the test requirements. The Interrupt pushbutton may be selected for continuous and automatic stimulus presentations, or the tone bar may be pressed for manual presentation. Channel 1 and C hannel 2 may be interlocke d for simultaneous presentations or operated independentl y. Each channel can be routed Right, Left or Left/ Right.

Chapter 4

The

1761-0100 Rev. B

4-1

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Alternate Binaural Loudness Balance (ABLB) or Fowler T est

The perceived growth of loudness of a s uprat hreshold tone i n an im paired e ar m ay diffe r from the compared growth of loudness of a tone of i dentical fre quency in t he normal ear. Recruitment, if present, may be found.

1. Assist the patient with the placement of the earphones.

2. Determine the threshold level for each ear at all frequencies being tested.

3. Select the ear to serve as the reference ear, typically the ear with the better hearing

sensitivity . This ear will receive the tone at a fixed intensity.

4. Select the ALTernate tone format. Channel 1 and Channel 2 will automatically interlock in

this selected format. The In terrup t button sho uld b e selected fo r au tomatic presen tation of the tone. The tone will alternate from Channel 1 at the rate of 400 msec on, 400 msec off followed by Channel 2 at 400 m sec on, 400 msec off.

5. The tone may be manually alternated between Channel 1 - Right and C hannel 2 - Left by

pressing the tone bar (with the Interrupt in the off position) for the duration of the time the signals are to be presented.

6. To increase the test reliability, the patient should be given several trials to judge whether a

variable tone is “softer,” “equal to,” or “louder” than the tone in the reference ear.

7. Set the intensity of the tone for each channel to 20 dB above the threshold of each

corresponding ear.

8. Alternate the tone presentation between the ears.

9. Keeping the intensity fixed in the reference ear, vary the intensity level of the tone

presented to the test ear. Record the level at which the patient judges both of the signals to be of equal loudness.

10. Repeat the above procedure increasing the intensity of the tone for the channel routed to

the reference ear by 20 dB each time until an intensity of 80 to 90 dB is reached. Identify the dB HL of the tone necessary to “balance” in loudness the tone in the reference ear at each level. This procedure is followed for each frequency to be balance tested.

4-2

1761-0100 Rev. B

Monaural Loudness Balance (MLB) Test

A comparison of perceived loudness growth is made betwee n two di fferent freque ncies o n the same ear .

. The frequency where the best hearing is detected is used as the “reference” frequency for

the comparison of perceived loudness with tones at the impaired frequency. There should be a difference of at least 25 dB between thresholds at each frequency tested.

. The output (tone) is routed to a single earphone (Right or Le ft).

. The procedure is essentially the same as the ABLB test. The signal is manually alternated

from frequency to frequency. The reference frequency is increased in intensity in 20 dB steps above threshold.

. Instruct the patient to indicate when the two frequencies appear to be equal in loudness.

. The level at which the loudness of the test frequency balances the loudness of the

reference frequency is recorded.

Chapter 4 - Special Test Procedures

1761-0100 Rev. B

4-3

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Short-Increment Sensitivity Index (SISI)

Patients exhibiting coc hlear pathol ogy a re be tte r able to detect small increments in intensity at low sensation levels than normally hearing subjects or subjects with patholog ies located elsewhere in the auditory system. A continuous tone is presented to the test ear at 20 dB SL

. Every five seconds, a selected increment in intensity is introduced to the continuously

presented tone for a duration of 200 msec.

Using earphones, establish the threshold of the test ear for the selected frequency.

Carefully instruct the patient prior to testing that a faint but steady sound will be heard and

a small jump in loudness may occasionally occur. The patient is instructed to respond each time he is certain that the jump is heard.

Press the SISI button and the desired dB Step size.

Select T o ne or FM and route t he stim ulus t o t he test ear t hrough Channel 1 (R ight o r Left ).

Set the intensity for Channel 1 to 20 dB above threshold. Masking noise may be routed to the contralateral ear through Channel 2.

Press the Interrupt button for Channel 1 (and Channel 2 if m asking is being use d).

Familiarize the patient with responding to noticeable increments in intensity by providing

practice trials selecting each available dB step (5 dB , 2 dB or 1 dB).

Present twenty 1 dB increments with the patient responding each time an increment is

detected. After the fifth, tenth, and fifteenth presentations, the increment can be omitted or raised to 5 dB as a check for validity of the response and to ensure against “rhythmic condition.”

Score each correct response by pressing the Correct button and each wrong response by

pressing the Incorrect button. The SISI percent score is displayed on the status screen.

Modifications to the SISI test

Select step sizes larger than 1 dB at 20 dB SL.

Present 1 dB increments at increasingly higher sensation l evels .

V ary step sizes from 1 dB t o 5 dB at 20 dB SL in both ears.

Present 1 dB increments at increasingly higher sensation levels to both ears.

4-4

1761-0100 Rev. B

High Frequency Testing (Optional)

The administration of some aminogly cosi de ant ibioti cs and/ or c hem othera pi es can ca use a sensory-neural hearing loss, typically observed in the high frequency ranges (above 12 kHz).

1. Installation of the High Frequency option is necessary for this test capability. Contact a

GSI representative for additional information.

2. Install the High Frequency earphones as shown in the following figures: High Frequency to

Booth, or High Frequency - No Booth.

3. Select the High Frequency audiogram display format by pressing the High Freq pushbutton

on the front panel.

4. Assist the patient with the placement of the High Frequency earphones.

5. Proceed as with pure tone threshold testing, recording the thresholds onto the audiogram.

High Frequency Testing: Setup Diagrams

Chapter 4 - Special Test Procedures

TDH-50 Low Frequency Phones

Sennheiser High Frequency Phones

High Frequency - No Booth

TDH-50 Low Frequency Phones

Sennheiser High Frequency Phones

1761-0100 Rev. B

High Frequency to Booth

4-5

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Sensorineural Acuity Level (SAL) Test

A modification of the Rainville Method.

A procedure for the measurement of sensorineural sensitivity comparing threshold shifts

roduced by bone conducted maskingnoise in normal hearingsubjects and in patients.

This narrow band masking allows for a noise intensity signal necessary to achieve the desirable greater threshold shifts at l ower f requencies.

Assist the patient with earphone (or insert phone) placement and with positioning the bone vibrator on the forehead.

Using Channel 1 with Phone and Tone selected, establish the patient’s air conduction thresholds in each ear for each frequency to be tested. Frequencies between 250 and 4000 Hz are suggested as the most useful for the purposes of this test.

Using Channel 2, select Bone and Narrow Band Noi se.

Determine air conduction thresholds again for each ear in the presence of bone conducted noise.

Determine the patient’s threshold shift caused by noise.

The “sensorineural loss” at each frequency is the difference between the patient’s threshold produced with the noise and the amount of shi ft no rm al hearing adul ts e xpe rie nce unde

the same conditions.

Hearing Aid Evaluation

Unaided Test

Based on the Carhart Method (1946).

Seat the patient in a sound field room (6 feet by 6 feet) at a distance equal t o one meter from the speakers. The patient’s ears should be at the same level with the face of the speaker.

The Insert phone may be selected as an alternate transducer for hearing aid evaluation.

Adjust Ext A and/or M ic to peak at an average of 0 on the VU meter.

Score each correct response by pressing the Correct button and each wrong response by pressing the Incorrect button to obtain an unaided Speech Reception Threshold (SRT). Live speech or recorded spondees will be presented in the test ear.

Continue with unaided word discrim ination testi ng to obtain a word discriminat ion score.

Obtain an unaided estimate of tolerance limits (Uncomfortable Loudness Level or UCL). The patient should be told that the clinician’s voice will be uncomfortably loud, but he should report whether he actually feels a pressure, a tickle or pain. Beginning at the speech reception threshold level, the patient is requested to answer simple questions while the attenuator for the selected channel is increased in 5 dB steps. Continue this procedure until a reading of 80 to 90 dB HL is reached or until the patient indicates that the sound is painful.

4-6

1761-0100 Rev. B

Chapter 4 - Special Test Procedures

Aided Test

The following aided tests are then performed for com parison.

. Obtain an aided Speech Reception Threshold in the sound field room with the patient

wearing the hearing aid to be evaluat ed.

. The attenuator for the channel routed t o the ai ded ear shoul d be set t o 40 dB HL (c om fort

setting).

. Instruct the patient to turn up the volume of the hearing aid until the tester’s voice is

comfortably loud. Hearing aid volume should remain at this setting throughout the test.

. Present spondees, beginning at the 40 dB setting and attenuating the intensity until the

aided threshold is reached.

. The aided discrimination score can then be obtained by initially setting the intensity to 30

to 40 dB above the aided t hreshol d. The hea ring aid’s volum e should be set fo r a 40 dB HL speech input.

. Obtain aided measurement of discomfort or tolerance limits with the same gain control

setting.

. The measurement of efficiency in noise can be determined .

a. Set the hearing aid gain for a 50 dB HL speech input level. b

. Present word discrimination material at 50 dB HL through Channel 1 t o the

aided test ear. c. Route speech or white noise to the aided test ear through Channel 2. d

. Increase the noise gradually until the words can no longer be repeated.

. Continue comparative tests with each hearing aid in evaluation.

1761-0100 Rev. B

4-7

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Tone Decay Test

Patients with retrocochlear patholo gy of the eighth nerve exhibit a rapi d “abnorm al auditory adaption” or a “temporary threshold drift” in response to a continuous pure tone presentation.

Carhart Tone Decay Test (1957)

Establish the patient’s hearing threshold for the test ear using earphones or insert phones

and selecting a pulsed tone.

Instruct the patient to depress the handswitch as soon as a tone is heard, and to release the

handswitch only when the tone becomes inaudible.

Begin the test with a continuous tone. Set the intensity for the selected channel to 0 dB SL

(or 20 dB SL to present an easier lis teni ng ta sk). The Interrupt push butt on m ay be select ed or the Tone bar may be manually depressed for the duration of the test.

As soon as the patient responds, begin ti ming by pressing the Start pushbutton of the

scorer/timer. Record the number of seconds the tone sustains audibility with the Timer on the front panel of the GSI 61 (F17).

If the tone becomes inaudible before the minute criteria is met, without interrupting the tone

presentation, raise the intensity in 5 dB steps until the tone is heard for a full minute.

Reset the timer at each increase in intensity level. Continue this procedure until the tone is

heard for a full minute, or until an intensity of 40 dB SL is reached.

Lombard or V oice-Reflex Test

The Lombard Testisbased on theprinciple thatindividuals monitor their vocal intensityby means of auditory feedback. It is normal for individuals to speak more loudly when exposed to a background of m asking noise (a pproxim ately 16 t o 20 dB above t he threshol d for the noise).

The patient is given a clearly typed paragraph to read aloud into the talk back microphone.

Put on the monitor headphones (monitor speaker may also be selected). Adjust Channel and T alk back monitor knobs to appropriate levels.

Select Speech Noise as the input signal on Channel 1. Routing should be Left/Right. The output is presented through the earphones or sound field speakers. Channel 2 is not active during this test.

Signal to the patient to begin reading. With the Channel 1 attenuator set to an intensity of 0 dB HL, gradually increase the intensity of the noise level.

ote the level of masking at which t he patient’s voice becomes m ore inte nse and c ompare

this level with the de

4-8

ree of supposedpatienthearingloss.

1761-0100 Rev. B

Delayed Auditory Feedback (D AF)

If a person’ s voice is recorde d and played back with a delay of 0.1 to 0.2 seconds, t he auditory feedback causes the speaker to slow down or alter his speech in a stuttering manner.

1. The patient is given a clearly typed text to read which can be completed in 30 to 60

seconds.

2. Using patient earphones, or sound field speakers, the test may be performed by routing the

stimulus (Ext A) to both ears (Left/Right), and with or without Speech Noise to the non-test ear .

3. The Examiner uses the same monitoring procedure desc ribed in Step 2 of t he Lombard test.

4. The patient is placed before the talk back microphone and asked to read the text. His

reading is tape recorded and timed with the timer.

5. The patient is asked to repeat the reading while the recording of the speaker’s voice is

routed to the selected transducer with a delay of 0.1 to 0.2 s econ ds .

Chapter 4 - Special Test Procedures

Note: A three head tape recorder with the appropriate delay capabilities is required.

6. The intensity of the signal (controlled by the attenuators) is first set to 0 dB HL and raised

10 dB after each reading is complete until a positive result is seen.

7. Each reading is timed with the timer. A change in the reading rate (3 to 5 seconds), an

increase in the vocal intensity, or a stuttering effect indicate that the auditory feedback was heard.

1761-0100 Rev. B

4-9

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Staggered Spondaic Word Test (SSW)

. Using earphones or speakers in a sound field, and an external source of speech, establish

the patient’s speech threshold relative to the three frequency, pure tone average for each ear .

. Set the intensity level of the signal for the Channel 1 and Channel 2 attenuators to 50 dB

. This level may be adjusted for severe hearing loss or tolerance problems. A presentation level of 30 dB SL is suggested when air-bo ne gaps exceed 20 dB (J. Katz and E

. White, unpublished).

. Forty spondaic words recorded on an external source are presented to the patient in

partially overlapping pairs. The patient is asked to repeat both spondees:

a. W ith C hannel 1 rout ed right and C hannel 2 r outed left, the first syllable of the first

spondee is presented to the right ear alone through Channel 1.

. Select the Interlock button and simultaneo usly present the second syllable of the first

spondee through Channel 1 to the right ear, and the first syllable of the second spondee to the left ear through Channel 2.

c. The second syllable of the second spondee is then presented to the left ear alone.

. The presentations of the spondees are alternated from ear to ear. (The right ear may

receive the first monosyllable and the left ear receives the first monosyllable of the next pair of spondees). Thus, twenty presentations are right ear first and twenty presentations are left ear first.

e. Practice word pairs should be presented to the patient before scoring begins.

Time --------------------------------> 123

Right ear up stairs Left ear down town

4-10

1761-0100 Rev. B

Doerfler-Stewart T est

It is difficult to maintain consistent supra-threshold responses to audito ry signals in the presence of several levels of noise in the same ear. Masking noise can cause confusion and interferes with the ability to judge the loudness of signals.

Using earphones or speakers in a sound field, establish a recorded binaural spondee

threshold (SR T each ear (Left/Right) through Channel 1.

Chapter 4 - Special Test Procedures

). Live voice (Mic) or record ed (Ext A or Ext B) spondees ma y be routed to

Raise the speech signal to SRT

+ 5 with the Channel 1 attenuator without interruption.

Speech noise is introduced to both ears (Left/Right) through Channel 2 along with the words.

Speech noise is introduced at a low level (0 dB HL is suggested) and is increased in 5 dB

increments with the Channel 2 attenuator for each spoken spondee until the intensity level is 20 dB below the SR T

Obtain the “noise detection threshold” (NDT).

Obtain the “noise interference level” (NIL) by increasing noise in 2 dB steps (Cha nnel 2)

+ 5.

until the patient stops repeating the spondees.

Maintain speech signal intensity (Channel 1) at the same level while increasing the

intensity of the noise (Channel 2) in 5 dB steps to a level 20 dB above NIL. Present one word at each increment level.

Maintain the noise at this level (Channel 2) and reduce the intensity of spondees in 5 dB

steps (Channel 1) to a level 15 dB below SRT

Decrease the level of noise in 5 dB steps (Channel 2) for each spoken spondee until NIL is

. Present one word at each decrement.

reached. Continue to decrease noise level and note the level at which the patient begins to again repeat spondees.

Reestablish a speech threshold (SRT

) as in Step 1.

Modified Doerfler-Stewart Test

This test is performed in one ear, using pure t ones a nd w hite noise as a m asker. selection for Channel 1 (Tone) and Channel 2 (White Noise) should be the same for the ear being tested (left or right).

1761-0100 Rev. B

Routing

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Pure Tone Stenger Test

If two tones identical in all ways except loudness are introduced simultaneously into both ears, only the louder tone will be perceived.

Screening Procedure

Assist the patient with the placement of earphones.

Use standard audiometric techniques to obtain a record of the patient’s “thresholds” at

each test frequency in both the good and the poor ear.

Interlock the tone bars of Cha nnel 1 an d C hannel 2. Route the tone to bot h ear

simultaneously (Channel 1 - Right; Channel 2 - Left).

Select the desired frequency. Set the attenuator for the channel routed to the better ear at a

level 10 dB above the threshold for that ear. Set the attenuator for the channel routed to the poorer ear at a level 10 dB bel ow t he th reshol d for that ear. Present the simultaneous tones.

Obtaining Minimum Contralateral Interference Levels

Present a tone at 10 dB SL to the better ear while simultaneously (C hannel 1 and Channel 2

interlocked) presenting a tone at 0 dB HL to the poorer ea r .

Maintain the same intensity level in the good ear but raise the intensity for the poorer ear

by 5 dB and present the two tones.

With each response, continue to present the tones to each ear simultaneously. Raise the

tone routed to the poorer ear by 5 dB each ti me the patient fails to respond.

Modified or Speech Stenger Test

Used, as is the Pure Tone Stenger test, in unilateral hearing losses to determine the level of contralateral interference when a speech signal is delivered to the ear with the greater loss. (The difference in SR T betwee n the ears should be at least 20 to 25 dB).

Follow the procedure described above (Pure Tone Stenger) using Speech stimuli.

Spondees are presented simultaneously by live voice or recorded speech at a level 10 dB

above the better ear threshold and 10 dB bel o w t he threshold for the poorer ear.

The minimum contralateral interference is determined in the same manner previously

described using spondees.

The minimum contralateral interference is the lowest intensity level in the poorer ear at

which the patient stops repeating 2 or more spondees correctly.

4-12

1761-0100 Rev. B

Routine Maintenance

Biological Calibration Check

The microprocessor based circuit design of the GSI 61 Clinical Audiometer should provide trouble-free service for a long time period. It is recommended to routinely make and file the audiogram of one person for t he purpose of biologic calibration. This person (or group of persons) should have a known stabl e audi omet ric curve that does not exceed 25 dB HL at any frequency. This procedure should start when the GSI 61 is first installed and then be continued. Remember that individual threshol d can shift by as much as 5 dB from day to day; however variations that exceed this range may point to difficulties which require attention.

Periodic Checks

The routine maintenance checks described below may point to the source of some instrument problems. If they do not, the instrument should receive technical service before further use. The checks should be made at periodi c int ervals, e ven if biol ogic checks reveal no problems.

Chapter 5

Earphone and Bone Vibrator Cords

With extended use, earphone a nd bone vibrator cords tend to fray internally at the connectors. This fraying can decrease or increase the signal level or an intermittent signal as the cord is flexed.

T o check for either condition, turn on the GSI 61. Set the HL to a comfortably audible level. Activate both Interrupt buttons to ON. Bend the cord next to the plug at both ends of each earphone. Listen for an intermittent signal, abrupt changes in the signal level, or a scratchy sound that coincides with the flexing of the cord. The presence of any of these conditions signifies that the cord should be replaced.

Repeat the test for the other earphone, the bone vibrator and the insert phones.

Hum and Noise

With the GSI 61 initialized to Tone test type and the Channel 1 Interrupt button in the ON mode, turn the Channel 1 Hearing Level control from 0 to 60 dB HL. Listen for low frequency hum (60 or 120 Hz) and any other noise (hiss or low rushi n g so un d) at al l at tenuat or levels through the earphone. Some audible noise at levels above 70 dB is permissible. If these noises are detected below 70 dB, the audiometer should be schedule for maintenance. Repeat this procedure with the Channel 2 Hearing Level cont rol .

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Distortion and Frequency Shift

This check can be made by listening to the GSI 61’s output through the earphones and pressing all frequencies (in the 125 Hz to 12000 Hz range) at a loud, but not uncomfortable level (70 to 80 dB HL for normal ears). Listen also to ensure that the signal fr equencies cha nge appropriately when the FrequencyL and R pushbuttons are operated. If distortion is heard in one earphone but not the oth er, the chances are high that the earphones are at fault and should be replaced. In any case, the audiometer should be scheduled for immediate maintenance.

Speech Level Check

To c heck t he speech le vel with recorded speech, select Ext. A, Channel 1, and ensure an external CD player is plugged into the GSI 61. Place the earphones on a person with normal hearing – Less than 25 dB. Present a word list from the CD player at 40 dB. If intelligible speech is not he a r d with the Ch annel 1Hearing Level control set at 40 dB or less, the audiometer or the external device should be scheduled for technical service. To double check a possible problem with the audiometer, check the speech level with live voice through the Mic.

Internal Controls Check

Should the front panel controls lock into one state and it is not possible t o change any of the parameters, turn off the power . Wait one minute and then power on.

Bone Vibrator Check

This check must be performed in a quiet en vironment or in a sound room . W ith the frequency Hz set to 2000 Hz, the Channel 1 HL set at 40 dB HL and the bone vibrator positioned properly, the tone should be clearly audible to a person with normal hearing – less than 25 dB. When a bone vibrator fails this test , the cali bration sh ould be verified. If the bone vibrat or cannot be calibrated to specifications, it should be replaced.

Masking Level Check

Select the Tone test type. Activate the Channel 2 Interrupt button so that it is on. Listen for a smooth, even hiss with the C hannel 2 Hearing Level control set at 50 dB HL.

Talk Forward Check

Speech should be clearly audible (in the earphones) when spoken in a normal tone with the T alk Forward dB HL control set at 45 dB HL.

5-2

1761-0100 Rev. B

Calibration Reference Levels

Chapter 5 - Routine Maintenance

It is recommended that each GSI 61 receive a thorough calibration certification once a year. If periodic checks are also desired, the t ables in this section provide the S PL values per frequency for each transducer . If the measured values are not within ± 5 dB at 125, 600 0, 8000 and 12,000 Hz in the earphones, the GSI 61 should be scheduled for immediate maintenance.]

Sound Pressure Levels for Pure Tones with TDH 50PEarphones

SPL values with TSH 50P earphones for 70 dB HL setting

Frequency 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 12000 Speech IEC 303

117.5 96.5 83.5 78.5 77.5 77.5 81.0 79.5 80.5 83.5 83.0 87.5* 90.0

IEC 318

115.0 97.0 83.5 79.0 77.5 77.5 79.0 81.5 82.0 86.0 85.5 82.5* 90.0

*Interpolated

Note: The 125 Hz through 8000 Hz values are based on ANSI S3.6-1989 and ISO 389-1991 Standards.

Reference Levels for Pure Tones with E•A•R Tone Earphones

SPL values with the E•A•R T one Earphones for 70 dB HL setting

Frequency 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 Speech IEC 126

96.0 84.0 75.5 72.0 70.0 72.0 73.0 73.5 75.5 72.0 70.0 82.5

98.0 87.5 79.5 76.0 75.5 79.5 81.5 83.0 85.0 86.0 85.5 88.0

IEC 711

Note: The 125 Hz through 8000 Hz values are based on ISO 389, Amendment 1.

Effective Masking Values for Pure T ones - ISO 8797

Narrow band noise SPL value for 70 dB HL setting

Frequency 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 12000 Speech Noise IEC 303

121.5 100.5 87.5 83.5 83.5 83.5 87.0 85.5 85.5 88.5 88.0 92.5* 90.0

IEC 318

119.0 99.0 87.5 84.0 83.5 83.5 85.0 87.5 87.0 91.0 90.5 87.5*

*Interpolated

Note: For narrow band noise, the level control is calibrated in dB of effective masking. The SPL in each one-third octave band centered at each frequency is calibrated to a level 3 dB above the standard reference level for this frequency.

1761-0100 Rev. B

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

(Pass Band Upper and Lower Frequency Limits at 3 dB Points)

Bandwidths for Narrow Band Masking Sounds

Center Frequency , Hz

Lower Limits, Hz Upper Limits Hz

, 125 105 -111 140 - 149 250 210 -223 281 - 297 500 420 -445 561 - 595 750 641 -668 842 - 892

1000 841-891 1120-1190 1500 1260-1340 1680-1780 2000 1680-1780 2240-2380 3000 2520-2670 3370-3570

4000 3360-3560 4490-4760 6000* 5050-5350 6730-7140 8000* 6730-7130 8980-9510

12000* 10092-10570 13500-14275

* Due to the limitations of the existing couplers and artificial ears, acoustic measurements are not required.

Bandwidth for Narrow Band Masking Sounds (High Frequency)

(Pass Band Upper and Lower Frequency Limits at 3 dB Points)

Center Frequency Hz

Lower Limits Hz Upper Limits Hz

,, 8000 6730-7130 8980-9510 9000 7570-8020 10100-10700

10000 8410-8910 11220-11890 11200 9420-9980 12570-13320 12500 10510-11140 14030-14870 14000 11770-12470 15710-16650 16000 13450-14250 17960-19030 18000 15138-16042 20196-21413 20000 16820-17815 22440-23792

5-4

Bone Vib rator (B71) Calibration V alues for Non-occluded T est Ear

Mastoid Placement (ANSI 3.43 and ISO 7566)

Frequency 250 500 750 1000 1500 2000 3000 4000 6000 8000 Speech* Radioear B71 with non-occluded ear

Tentative

67.0 58.0 48.5 42.5 36.5 31.0 30.0 35.5 40.0 40.0 55.0 dB re: 1 N

Notes: These values were obtained with 30 to 35 dB effective masking by air conduction to the non-test ear.

The above values apply for the mast oid position using the Bruel and Kjaer ty pe 4930 artificial mastoid, having manufactu rer’s serial numbers of 526226 or highe r, and type B71 bone vibrators used with a P-3333 headband.

These values are from ANSI 3.43 and ISO 7566.

o standard reference equivalent threshold level for speech has been established for bone

vibrators.

The reference level used for the calibration of speech is 12.5 dB above the 1000 Hz level or at a force level of 51.2 dB re: 1 N.

The values in the table are

ased on 0 dB HL settings.

1761-0100 Rev. B

Chapter 5 - Routine Maintenance

Bone V ibrator (B71) Calibration Values for Non-occluded T est Ear

Forehead Placement (ANSI 3.43 and ISO 7566)

Frequency 250 500 750 1000 1500 2000 3000 4000 6000 8000 Speech* Radioear B71 with non-occluded ear

* Tentative

79.0 72.0 61.5 51.0 47.5 42.5 42.0 43.5 51.0 50.0 63.5* dB re: 1 N

Speaker Reference Threshold Levels Re: 20 mPa

Frequency 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 12000 Speech 45° Azimuth 0° Azimuth

23.5 12.0 3.0 0.5 0.0 -1.0 -2.5 -9.0 -8.5 -3.0 8.0 11.5 12.5

24.0 13.0 6.0 4.0 4.0 2.5 0.5 -4.0 -4.5 4.5 13.5 13.5 16.5

Frequency (Hz) 45° Azimuth 0° Azimuth

8.0 10.5 11.0 10.0 11.5 16.0 43.5

13.5 15.5 15.5 14.0 13.0 18.0 44.5

Notes:

1 . Forty-five degree Azi muth reference threshold val ues are based on ISO 8253-2. 2 . Zero degree Azimuth reference t hreshold values are based on ISO 226 -1.

Frequency (Hz) 8 K 9 K 10 K 11.2 K 12.5 K 14 K 16 K 18 K 20 K Sennheiser HDA 200

Reference threshold values based on ISO/TC 43/WG 1 N 190 and Tom Frank, PhD; “High Freq. Hearing Thresholds in Young Adults Using a Commercially Available Audiometer,” Ear and Hearing, Vol. 11 No. 6, 1990.

8000 9000 10000 11200 12500 14000 16000

Reference Levels for Pur e Tones with Sennheiser HDA 200

SPL V alues with the Sennheiser HDA 200 Earphones for 0 dB HL Setting

16.0 17.0 21.5 21.0 27.5 37.5 58.0 8 3 105

1761-0100 Rev. B

5-5

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

The Message “CAL”

The calibration for the GSI 61 is stored in the system’s memory, and this data is continually monitored. If an erro r should be found in the calibration memory, the message “CAL” is displayed in the appropriate channel’s intensity area. “CAL” is displayed as long as the faulted transducer and stimulus combination is selected. The channel is forced into an off condition and cannot be turned on until a new stimulus and transducer combination is selected. When the message “CAL” appears in either Channel 1 or Channel 2, note the specific combination selected. Try the same combination on the alternate channel. Or p o w e r down and power up to attempt to clear the fault. Should “CAL” continue to be displayed, contact a service representative and report the specific combinations and conditions used.

The Message “Help”

Should the message “Help” appear in the message area of the display, the GSI 61 will enter a lock out mode which will disable all front pan el operations. In addition to the me ssage “Help,” code numbers will appear. These numbers are important as they indicate the possible source of the problem.

Note: It is extremely important to record these numbers.

Reset the GSI 61 by turning off the power, waiting 30 seconds, then turning it on. Should “Help” continue to be displayed, contact a service representative and report the specific conditions used.

Line Voltage Brownout and Interruptions

The GSI 61 is designed to protect against abnormal AC power conditions by returning to the power-up initialization settings; thereby protecting the un it against unwanted conditions at the transducers. This will automatically occur when interference is not too severe. However, under extreme conditions the GSI 61 will enter a lockout mode which will not permit front panel operations and then restarting operation.

. This can be rectified by simply powering down for approximately thirty seconds

5-6

1761-0100 Rev. B

Remote (RS 232) Option

Remote Options

Description

The interface option for the GSI 61 Clinical Audiom eter allows electronic transm ission of test parameter information from the GSI 61 to a remote external computer; the user may also remotely control the operations of the GSI 61 by an external computer. The RS 232 option can only be used with those instruments which have the Remote board installed.

Two communicat ion protocol s are available with the GSI 61. One is identical to the protocol used on the GSI 1 6 Audiom eter allowi ng the G SI 61 t o be use d in the sam e environment as that instrument. The other interface protocol adds the features provided by the GSI 61 such as the ability to transmit complete audiogram information with a single push of the Data Transmit button, and High Frequency audiometry.

Operation

The GSI 61 Data Transfer option functions in all operative test modes of the audiometer. software link is enabled by pressing the Remote button on the instrument’s front panel; a message to this effect can be observed on the LCD display. The link is disabled by depressing the Remote button again. Note that the word “Remote” will be erased. The Remote indicator must be displayed in order for the tra nsfer of i nform ation t o occur. Actual data captur e and tr ansfer oc curs when th e Data Tr ansfer bu tton on the fr ont panel is pressed. Wh en the Data Transfer button is pressed; all pertinent unit switch settings and display information is internally buffered by the GSI 61 for transmission through the serial interface to an external computer. During the period of data capture and to the end of transmission of the data record, “Da ta Transfer” is displayed on the LCD panel (activation will be 0.5 seconds, minimum).

Chapter 6

RS 232 Configuration

The GSI 61 is configured as a DCE (D ata Communications Eq uipment) device a nd would normally connect to a remote device configured as a DTE (Data Terminal Equipment) device. Hardware hands haking (R TS/ CTS) and soft ware handsha king (x on/xoff) a re provided to control data flow.

The RS 232 configuration of the GSI61 Remote interface must be set to match the interface configuration of the comput er. This configuration is set by the Grason-Stadler service representative during installation. A dip switch (S1) is provided on t he serial interface board to configure the interface for baud rate, parity and number of data bits, number of stop bits and data flow control; this switch is inside the GSI 61 and is not accessible by the user. These settings are read on power up and the hardware is initialized appropriately.

1761-0100 Rev. B

6-1

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

The configuration is selected as follows:

OFF = Logical 1 ON = Logical 0

Baud rate: Position # 3 2 1 Selection

OF F OFF OF F 9600 Baud (GSI 16 compatible) OFF OFF ON 4800 (GSI 16 compatible) OFF ON OFF 2400 (GSI 16 compatible) OFF ON ON 1200 (GSI 16 compatible)

ON OFF OFF 600 (GSI 16 compatible) ON OFF ON 19.2K ON ON OFF Invalid Selection ON ON ON Invalid Selection

Parity/Data Bits: Position # 5 4 Selection

OFF OFF No Parity /8 Data Bits OFF O N Odd Parity /7 Data Bits

O N OF F Even Parity /7 Data Bits

ON ON Space Parity /7 Data Bits

(GSI 16 compatible)

Data Flow Control: Position #6 OFF = Hardware flow control used.

(GSI 16 compatible) ON = Software Flow control used.

Stop Bits: Position #7 OFF = 1 Stop bit

ON = 2 Stop bits (GSI 16 com patible)

Position #8 This position is not used.

The default settings are 9600 baud, no parity , 8 data bit s , 1 st op bit, a n d hardware flow control.

6-2

1761-0100 Rev. B

USB Overview

Print Capability

Remote Computer Capability

Compatibility

Printer Interface Language Compatibility

Data/Control Interface Hardware Compatibility

The GSI 61 remote option allows for interfacing the audiometer to an external USB printer (either color or monochrome) for the purpose of printing au diogram records. Additionally, the GSI 61 can be connected to a remote computer for managing patient records. Connection to the remote computer is v ia a US B co nn ection.

Refer to the Optional Accessories section of Chapter 2 in the GSI 61 User Manual (PN: 1761-0100) for print functionality/capabilities.

The details of the Remote data stream are described in greater detail within this chapter.

In general, for a printer to be compatible, it must support th e pr int lang uag e PCL3. If a printer does not support PCL3, it is known to be incompatible. Support of PCL3 print language may not guarantee that a printer is fully compatible. Even for a compatible printer, advanced print features may not be available.

Compatible Print Languages

PCL3 is the native print language of the GSI 61. A number of PCL print languages are considered to be supersets of PCL3 and should be compatible if implemented strictly to the specification. Rarely, a printer manufacturer may deviate slightly from the PCL specification and incompatibility can occur. Any time a new printer is to be specified, verify compatibility carefully. Superset languages include: PCL3+, PCL4, PCL5, PCL5e, PCL5c, and PCL6 Standard.

Incompatible Print Languages

PCL3 GUI, PCL6 Enhanced, PCL XL, all PostScript, PictBridge, and GDI languages.

The remote board is USB 2.0 Slow/Ful l speed com patible. Since USB 2.0 is a superset of USB 1.x, it is also com patible with those computers using USB 1.x.

Operating System Compatibility

The remote option is possible with the following operating systems:

Chapter 6 - Remote Options

Windows XP Pro Windows Vista Business Windows 7 (32 or 64 bit)

1761-0100 Rev. B

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Driver Installation and System Setup

Switch Position ON/UP OFF/DOWN

1 - Single/Dual Audiogram R&L Audiograms print on a common axis R&L Audiograms print on separate axes 2 - Color/B&W Prints are in col o r Prints are in B&W 3 - Unused Do Not Use Default 4 - Bar Code No bar code is printed Bar code is printed

Driver Installation is platform and operating system dependent. Refer to the installation instructions on the driver media (CD-ROM P/N: 1761-0650) that corresponds to this system and its operating system. For most Windows operating systems, the necessary drivers will install automa t i c a ll y . Ins ert the CD-ROM into th e P C pr io r to co nnecting the GSI 61 . On c e the drivers are installed, the CD-ROM can be removed and stored for future use or reference.

Set configuration switch S# according to the desired print color and audiogram arrangement.

Remote Computer When the GSI 61 is connected to the computer, it will show up on the PC as a virtual COM

port. The application will need to select that COM port. Generally, the serial port parameters (baud rate, stop bits, parity, handshaking, etc.) are then arbitrary and the virtual COM port driver handles all of those considerations. Simply select the desired COM port and accept the default parameters for baud rate, parity, etc. The virtual COM port normally appears as COM5. The COM designation can be changed through the Windows “Hardwar e Device Manager,” if necessary.

GSI Suite

GSI Suite Audiometric Data Management software is compatible with the GSI 61 as well as the TympStar. GSI Suite captures, saves, and stores audiometric data from the GSI 61 and allows the addition of comments into a report. It can also provide the data in a PDF format that is compatible with electronic medical data records.

Data transferred from the GSI 61 include the following: air conduction (masked and unmasked) thresholds, bone conduction (masked and unmasked) thresholds, and sound field thresholds. Speech information and Pure Tone Averages are entered manually in the appropriate fields with GSI Suite. All Masking levels are saved and printed on the report created by GSI Suite. The audiogram is saved to a directory for future retrieval and/or converted to PDF format for easy transfer to an EMR program. If configured, the report can also be e-mailed.

Every GSI 61 that has a remote board (RS 232 or USB) is compatible with GSI Suite.

1761-0100 Rev. B

Data Flow Control Operation

Hardware Flow Control

When hardware control is selected, RTS/CTS handshaking is used. The remote device may use the RTS signal to allow or inhibit data transmission f or the GSI 6 1 to t he rem ote device. When the RTS signal is set true by the remote device, the GSI 61 is enabled to transmit data. When the RTS signal is set false by the remote device, the GSI 61 is inhibited from transmitting data. The remote device should insure that RTS is set true prior to requesting data from the GSI

61. If the RTS signal is false at the start of a transmission, or goes false during a transmission, the GSI 61 will wait for 6 seconds for the signal to return true. If this do es not occur, the transmission is aborted and the error message “Not Available” will temporarily flash.

The GSI 61 uses the CTS signal to allow or inhibit data transmission from the remote device to the GSI 61. When the CTS signal is set true by the GSI 61, the remote device may transmit to the GSI 61. When the CTS signal is set false by the GSI 61, the remote device must not transmit to the GSI 61. Failure to comply with this condition may result in the loss of data transmitted to the GSI 61.

The GSI 61 will set the CTS line false to prevent data transmission by a remote com puter. This occurs while processing a completed input command, while printing, while the GSI 61 is transmitting a record and whenever the remote device is not enabled through the Remote button.

Chapter 6 - Remote Options

Software Flow Control

When software flow control is selected, XON/XOFF handshaking is used. Software XON/ XOFF flow control is available to allow software commands from the external computer to start and stop the flow of data from t he GSI 61. The XOFF character used is the ASCII control character [DC3]. The XON character used is the ASCII control character [DC1]. Sending XOFF to the GSI 61 pauses its transmi ssion; sendi ng XO N to the GSI 61 resum es the transmission. Once XOFF is received by the instrument, XON must be received within 6 seconds. If it is not received within this time constraint, the error message “Not Available” is fl ashed on t he fr ont LC D panel.

Cable Connections

The GSI 61 remote interface provides a serial interface consisting of RxD (Received Data), TxD (Transmitted Data), R TS (Request to Send), CTS (Clear t o Send) and ground signals at the end of the supplied DB-25 male connector. This cable, which is supplied with the Remote Option, can also be purchased as an Apple “Hayes Modem” cable, available from Apple dealers.

IMPORTANT: Make sure this cable incorporates all the signals in the figure below!

1761-0100 Rev. B

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Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Data T ransfer

Record and Field Formatting

Communication with the remote device is performed by sending and receiving i nformation in “records.” Each type of information has its own record format. Each record is divided into “fields” which contain specific information. All records are formatted with a predefined, fixed length format. The ge neric format for all records is:

Record Prefix Record Type Data Fields Checksum Record Terminator

The record prefix consists of a “:” character and d eno te s the star t of a record. Input records do not contain a checksum. The record terminator consists of a “CR,” “LF” sequence. Each r ecord co nsists o f f ixed length d ata fields with any unused or Zero data fields filled with a “0.” All records consist of a sequence of printable ASCII characters from the set of “0” to “9,” “A” to “G,” “-,” “:,” .”,” “_,” “CR” and “LF.” All multiple character ASCII fields will be right justified with unused character positions filled with “_” characters. Positive numeric values will not contain a “+” sign; this will be implied. Negative values con ta in a “ -” s ign in any ch ar a ct er pos itio n to the lef t of the mos t significant digit if the num ber. Unless specified, the decimal point for non-integer numbers will not be included in the character sequence.

Checksums

Checksums will be calculated so as to maintain compatibility with the GSI 16 as the mod 256 sum of all preceding characters on the record, including the “:” prefix, and stored as two HEX ASCI I characters.

6-6

1761-0100 Rev. B

Remote Input Operation

Validation

Each character is validated for parity, frami ng, overrun, and break interrupt errors. If an error is detected, an error message is displayed to indicate the type of error. For overrun errors, an error record is transmitted back to the remote. For parity and frami ng erro rs, no error record is transmitted since any transmission most likely will result in a similar error at the remote and the record would be unintelligible. If a spurious character is received, an error message is flashed on the LCD. When a complete input record is received, the record is validated and processed. If the record is invalid, an error record is transmitted back to the remote device. All input records are validated in the following manner:

• must begin with a “:,” and end with a carriage return, line feed sequence,

• must contain all valid ASCII characters,

• must conta in a valid r eco rd typ e ,

• must contain a valid function code, and

• must contain a valid function subcode when required.

Acknowledgment

The GSI 61 will acknowledge the correct reception and processing of all input records by transmitting an ASCII ACK character after the record has been processed. This record acknowledgment will not be sent if the GSI16 compatible record format has been selected.

Chapter 6 - Remote Options

Input Record Type

These records are sent by the remote device to control its functions.

Input Record Type 1 to 4

Reserved for the GSI10.

Input Record Type 5 - Pushbutton Code Record

This record type provides the ability to remotely simulate the operat ion of all user controls. The record specifies the control operation using a function code which defines the group of controls and a sub-function code which defines the specific parameter to select of the function to perform. Control operations are processed in the same manner as if they had been manually entered. All parameter or functional defaults and restrictions will still apply.

1761-0100 Rev. B

6-7

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Function Function Group Function Sub Code Pushbutton/

Code Subgroup Function

01 Reserved for GSI 10

02 Channel 1 Stimulus “0” Tone

03 Reserved for GSI

“1” NB Noise “2” White Noise “3” Speech Noise “4” Mic “5” Ext A “6” Ext B

04 Reserved for GSI

05 Channel 2 Stimulus “0” Tone

“1” NB Noise “2” White Noise “3” Speech Noise “4” Mic “5” Ext A “6” Ext B

06 Transducer

Combinations Channel 1

“0” Bone Bone “1” Spk Spk “2” Spk Phone “3” Bone Phone “4” Phone Phone “5” Phone Bone “6” Phone Spk “7” Phone Insert “8” Bone Spk “9” Bon

“A” Spk Bone

“B” Spk Insert “C” Insert Phone

“D” Insert Bone

“E” Insert Spk “F” Insert Insert

Channel 2

Insert

07 Output Routing Channel 1

08 Subject Trigger “0” No

09 F M “0” Off

10 Interlock “0” Off

11 Tracking “0” Off

6-8

Channel 2

Combinations “0” Left Right

“1” Right Left “2” Left Left “3” Right Right “4” Left/Right Left/Right

“1” Yes

“1” On

1761-0100 Rev. B

Chapter 6 - Remote Options

Function Function Group Function Sub Code Pushbutton/

Code Subgroup Function

Reserved for GSI 10

Test Frequency “0” Decrement Frequency

“1” Increment Frequency

Reserved for GSI 10

Channel 1 Tone Bar “0” Release

“1” Press

Channel 2 Tone Bar “0” Release

“1” Press

Channel 1 Intensity “0” Decrease 1 step

Control “1” Increase 1 step

Channel 2 Intensity “0” Decrease 1 step

Control “1” Increase 1 step

Channel 1 Interrupt “0” Off

“1” On

Channel 2 Interrupt “0” Off

“1” On

Reserved for GSI 10

Remote Output “0” Normal mode: Initiates

Request a data record transfer of the

current type selected on the remote dip switches.

“1” HL Calibration Mode:

Stores the calibration data into EEPROM.

All modes: Initiates a data record transfer of the current test type selected on the remote dip switches.

1761-0100 Rev. B

Pulsed “0” Off

“1” On

ALTernate “0” Off

“1” On

SISI “0” Off

“1” On

Transducer Type “0” Ch 1 Phone

“1” Ch 1 Bone

6-9

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Function Function Group Function Sub Code Pushbutton/

Code Subgroup Function

29 conti nued Transduc e r Type “2” Ch 1 Spk

Routing “0” Ch 1 Left

SISI/ HL Control

Monitor Speaker “0” Off

“3” Ch 1 Insert “4” Ch 2 Phone “5” Ch 2 Bone “6” Ch 2 Spk “7” Ch 2 Insert

“1” Ch 1 Right “2” Ch 1 Left/Right “3” Ch 2 Left “4” Ch 2 Right “5” Ch 2 Left/Right

Step Size “0” dB

“1” dB “2” dB

“1” On

Calibration Mode “0” Exit to Normal Mode

“1” Enter HL Calibration Mode

Scorer/Timer “0” Correct/Start

“1” Clear/Clear “2” Incorrect/Stop

Print “0”

Data Erase “0”

37 Talk Forward “0” Off

“1” On

Talk Forward Level “0” 45 dB

“1” 60 dB “2” 75 dB “3” 90 dB

Oscillator Control “0” Turn Oscillator off

“1” Turn Oscillator on

Screen Display “0” Status display

“1” Audiogram display “2” High Freq. Audiogram

Display

6-10

Save “0”

Frequency range “0” High Freq.

(8000 - 20000 Hz)

“1” Normal Freq.

(125 - 12000 Hz)

Transmit Unit ID “0”

record

1761-0100 Rev. B

Chapter 6 - Remote Options

Function Function Group Function Sub Code Pushbutton/

Code Subgroup Function

Transmit Unit “0”

configuration record

Load Default Data “0” Load HL configuration

default data

“1” Load Self Calibration

default data

“2” Load all default data

Perform Self-Cal “0”

Data Transfer Transmit a data output

record in the following format:

“0” (Spare format, currently

defaults to “3”)

“1” GSI 16 Compatible

Short Data Record

“2” GSI 61 Short Data

Record

“3” Test Battery Data

Record

Input Record Type 6- Set Test Frequency Record

Enter Diagnostic “0” Exit to Normal Mode

Mode “1” Enter Push Button diagnostic

“2” Enter Display diagnostic “3” Enter Hardware diagnostic “4” Enter Loopback diagnostic

This record is used to set the frequency of the oscillator to the standard audiometric low and high frequencies in the Normal, HL Calibration and SISI Calibration modes. This record type is invalid in the Push Button diagnostic, Display diagnostic and Loopback diagnostic modes. Nonstandard frequencies, fre quencies ou tside th e current r ange or frequencies invalid for the current transducer are invalid and will result in an error record being transmitted. Frequencies greater tha n 12 kHz are invalid if the GSI 16 compatible record format is selected and will also result in an error record being transmitted.

Character Number of Field Name Field Description

Offset Characters

Record Prefix “:”

Record Type “6”

Function Code “01”

Test Frequency Format: Frequency value in Hz

( i.e. 750 Hz = “_750”) Range: Low Freq. - 125 Hz to 12 kHz High Freq. - 8 K to 20 kHz Resolution: Standard Audio frequencies

1761-0100 Rev. B

Record “CR,” “LF”

Terminator

6-11

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Input Record Type 7 - Set HL Record

The record which is set by this record varies based on the operating mode ind i c ate d below. This record type is invalid in the Push Button Diagnostic, Display Diagnostic and Loopback Diagnostic modes and will result in an error record being transmitted.

Character Number of Field Name Field Description

Offset Characters

Record Prefix “:”

Record Type “7”

Function Code “01” = Ch 1

HL value Format HL value with 1

Record Terminator “CR,” “LF”

“02” = Ch 2

implied decimal position (i.e. 20 dB HL = “_200”) Range: Low Frequency: -10 to 120 dB HL High Frequency: -20 to 100 dB HL Resolution: 1 dB

6-12

1761-0100 Rev. B

Remote Output Operation

Chapter 6 - Remote Options

Output Record Type 1- GSI 16 Compatible Short

Data

These records are sent by the GSI 61 to the remote computer to transfer parameter or status information. During the time that an output record is being sent and transmitted, the Data Transfer indicator is displayed on the LCD panel. The indication displays for a minimum of 0.5 seconds.

Character Number of Field Name Field Description

Offset Characters

Record Prefix “:”

Record Type “1”

Test Type “0” = Tone test

Ch 1 Stimulus “1” =Tone

Zero Field “0”

“1” =Speech test “3” =SISI test “4” =Alternate test

“2” =NB Noise “3” =White Noise “4” =Speech Noise “5” =Mic “6” =Ext A “7” =Ext B

SISI “0” =None/Off

“1” =Reserved for GSI 10 “2” =On with 1 dB step size “3” =On with 2 dB step size

1761-0100 Rev. B

6-13

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Character Number of Field Name Field Description

Offset Characters

5 continued

SISI “4 ” = Re se rv ed fo r GSI 10

“5” =On with 5 dB step size

Timing “0” =None/Steady

“1” =Reserved for the GSI 10 “2” =Pulsed 200/200 msec on/off

Zero Field “00”

Ch 2 Stimulus “1” =Tone

“2” =NB Noise “3” =White Noise “4” =Speech Noise “5” =Mic “6” =Ext A “7” =Ext B

Transducer Type Ch 1 Ch 2

“1” =Bone Bone “2” =Spk Spk “3” =Spk Phone “4” =Bone Phone “5” =Phone Phone “6” =Bone Spk “7” =Bone Insert “8” =Spk Bone “9” =Spk Insert “A” =Phone Bone “B” =Phone Spk “C” =Phone Insert “D” =Insert Bone “E” =Insert Spk “F” =Insert Phone “G” =Insert Insert

6-14

Output Routing Ch1 Ch2

“0” =None None “1” =Left Right “2” =Right Left “3” =Left Left “4” =Right Right “5” =LR LR “6” =Left LR “7” =Right LR “8” =LR Left “9” =LR Right “A” =None Left “B” =None Right “C” =Left None “D” =Right None

Subject Response “0” =Released

“1” =Pressed

F M “0” = Off

“1” = On

Interlock “0” = Off

“1” = On

1761-0100 Rev. B

Chapter 6 - Remote Options

Character

Offset

Number of Field Name

Characters

Tracking

Zero Field

HL Step Size

Ch 1 Numeric HL Display Data

Ch 1 Interrupt “0” = Off

Ch 2 Numeric HL “-100” to “1200” Display Data Range: - 10.0 to 120.0 dB

Ch 2 Interrupt “0” = Off

Frequency Display “__125” to “12000” Data Range: 125 to 12000 Hz in

Field Description

“0” = Off “1” = On

“00”

“1” = 1 dB “2” = Reserved for GSI 10 “3” = 5 dB “4” = 2 dB

“-100” to “1200” Range: -10.0 to 120.0 dB

“1” = On

standard audiometric frequencies

Output Record Type 4 - Error Record

Zero Field “000000”

Checksum See page 6-4; Checksums

Record Terminato

“CR,” “LF”

Contains information on the type of error which has occurred. The types of errors which would result in an Error Record are:

•

System errors

•

Input record which has an incorrect format or is invalid for the current operating

mode

•

Pushbutton operation commands which are invalid

Character Offset Number of Field Name Field Description

Characters

Record Prefix “:”

Record Type “4”

Error Code See next table;

Checksum See page 6-4; Checksums

Error Codes

1761-0100 Rev. B

Record Terminator “CR,” “LF”

6-15

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Error Record Codes

Output Record Type 5 - GSI 61 Short Data

Record

6-16

Error Code Error Description

01 Invalid ASCII character in an input record 02 Invalid number of characters in an input record 03 Invalid input record type 04 Invalid input record function code 05 Invalid input record funct ion sub code 06 Reserved 07 Invalid Set Frequency record Frequency value 08 Invalid Set HL record HL value 09 Invalid machine conditions for GSI 61 compatible data 10 Generic NACK in response to an invalid input record 11 Invalid Start-of Record: when receiving unexpected characters 12 Overrun of GSI 61 UART 13 Invalid combination of Basic Speakers and Booster Amp 14 Invalid HL; requested HL cannot be provided due to attenuator limits.

HL set to closest possible value. 15 Printin g was aborted by keypad. 16 Printing was unsuccessful due to communications or printer problem.

Contains the current state of all instrument parameters, including the expanded frequency and HL ranges of the GSI61. This record is not GSI 16 c om patible.

Character Number of Field Name Field Description

Offset Characters

Record Prefix “:”

Record Type “5”

Test Type “0” = Tone test

Ch 1 Stimulus “1” = Tone

Zero Field “0”

SISI “0” = None/Off

Timing “0” = None/Steady

Zero Field “00”

“1” = Speech test “2” = SISI test “3” = Alternate test

“2” = NB Noise “3” = White Noise “4” = Speech Noise “5” = Mic “6” = Ext A “7” = Ext B

“1” = Reserved for GSI 10 “2” =On with 1 dB step size “3” =On with 2 dB step size “4” = Reserved for GSI 10 “5” =On with 5 dB step size

“1” = Reserved for the GSI 10 “2” =Pulsed 200/200 msec on/off

1761-0100 Rev. B

Chapter 6 - Remote Options

Character Number of Field Name Field Description

Offset Characters

Ch 2 Stimulus “1” = Tone

“2” = NB Noise “3” = White Noise “4” = Speech Noise “5” = Mic “6” = Ext A “7” = Ext B

Transducer Type Ch 1 Ch 2

“1” = Bone Bone “2” = Spk Spk “3” = Spk Phone “4” = Bone Phone “5” = Phone Phone “6” = Bone Spk “7” = Bone Insert “8” = Spk Bone “9” = Spk Insert “A” = Phone Bone “B” = Phone Spk “C” = Phone Insert “D” = Insert Bone “E” = Insert Spk “F” = Insert Phone “G” = Insert Insert

Output Routing Ch1 Ch2

Subject Response “0” = Released

“1” = Pressed

F M “0” = Off

“1” = On

Interlock “0” = Off

“1” = On

Tracking “0” = Off

“1” = On

1761-0100 Rev. B

Zero Field “00”

HL Step Size “1” = 1 dB

“2” = Reserved for GSI 10 “3” = 5 dB “4” = 2 dB

6-17

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Character Number of Field Name Field Description

Offset Characters

Ch 1 Numeric “-200” to “1000”

HL Display Data Range: -20.0 to 100.0 dB

Ch 1 Interrupt “0” = Off

“1” = On

Ch 2 Numeric “-200” to “1000”

HL Display Data Range: - 20. 0 to 100.0 dB

Ch 2 Interrupt “0” = Off

“1” = On

Frequency Display “__125” to “20000”

Data Range: 125 to 20000 Hz in

standard audiometric frequencies

Timer Value Elapsed time in seconds.

Range: “____0” to “12000” seconds

Output Record Type 6 - Test

Battery Data Record

Record Prefix

Left Ear Test Data – Pure Tone

Scorer # Correct Number of correct Speech Test

Value Zero responses. Range: “__0” to “100”

Scorer Total Value Total number of Speech Test

presentations. Range: “__0” to “100”

Checksum See page 6-4; Checksums

Record Terminator “CR,” “LF”

Contains all left and right ear test data currently stored in the test data memory. This record is not GSI 16 compatible.

Character Number of Data Type Field Name

Offset Characters

1 ASCII

ASCII

slnt

RecordPrefix

Record Type

Pure Tone Test 125 Hz Air Conduction Threshold- Test Ea

Pure Tone Test - -20 to 120 dB x 2 125 Hz Air NR = 260 to 540 Conduction NT = 32768 (0x8000) ThresholdMasking Ea

Field Description

“:”

“6”

-20 to 120 dB x 2 R = 260 to 540 T =32768 (0x8000)

6-18

1761-0100 Rev. B

Chapter 6 - Remote Options

Character Number of Data Type Field Name Field Description

Offset Characters

sln t Pure Tone Test - -20 to 120

125 Hz Bone NR = 260 to 540 Conduction NT = 32768 (0x8000) Threshold- Test Ear

s l n t Pure Tone Test - -20 to 12 0 dB x 2

125 Hz Bone NR = 260 to 540 Conduction NT = 32768 (0x8000) ThresholdMasking Ear

s l n t Pure Tone Test - -20 to 12 0 dB x 2

125 Hz Sound Field NR = 260 to 540

NT = 32768 (0x8000)

Pure Tone Test - See Pure Tone Test -

250 Hz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

500 Hz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

750 Hz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

1 kHz 125 Hz fields

102

122

142

162

182

202

222

242

262

Pure Tone Test - See Pure Tone Test -

1.5 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

2 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

3 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

4 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

6 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

8 kHz Low Freq 125 Hz fields

Pure Tone Test - See Pure Tone Test -

12 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

8 kHz High Freq 125 Hz fields

Pure Tone Test - See Pure Tone Test -

9 kHz 125 Hz fields

1761-0100 Rev. B

282

302

Pure Tone Test - See Pure Tone Test -

10 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

11.2 kHz 125 Hz fields

6-19

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Character Number of Data Type Field Name Field Description

Offset Characters

322

342

362

382

402

422

Speech Test

424

428

Pure Tone Test - See Pure Tone Test -

12.5 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

14 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

16 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

18 kHz 125 Hz fields

Pure Tone Test - See Pure Tone Test -

20 kHz 125 Hz fields

uChar Bone Vibrator “_0” = Forehead

Calibration “_1” = Mastoid

sl nt Speech Test - -20 to 120 dB x 2

Test Ear Threshold NR = 260 to 540

NT= 32768 (0x8000)

sl nt Speech Test - -20 to 120 dB x 2

Masking Ear NR = 260 to 540 Threshold NT = 32768 (0x8000)

SISI Test

432

434

436

438

442

444

446

uChar Speech Test - “_0” = None

Masking Type “_1” = White Noise

“_2” = Speech Noise “_3” = Ext A “_4” = Ext B

uChar Speech Test - _0 to 100

Number Presented

uChar Speech Test - _0 to 100

Number Correct

slnt SISI Test - 125 Hz _-20 to 120 dB HL

Test Ear Threshold x 2

NR = 260 to 540 NT = 32768 (0x8000)

uChar SISI Test - 125 Hz “_0” = 5 dB

Pulse Height “_1” = 2 dB

“_2” = 1 dB

uChar SISI Test - 125 Hz _0 to 100

Number Presented

uChar SISI Test - 125 Hz _0 to 100

Number Correct

448

6-20

SISI Test - 250 Hz See SISI Test - 125 Hz

Fields

1761-0100 Rev. B

Chapter 6 - Remote Options

Character Number of Data Type Field Name Field Description

Offset Characters

458 10 SISI Test - 500 Hz See SISI Test - 125 Hz

Fields

468 10 SISI Test - 750 Hz See SISI Test - 125 Hz

Fields

478 10 SISI Test - 1 kHz See SISI Test - 125 Hz

Fields

488

498 10 SISI Test - 2 kHz See SISI Test - 125 Hz

508 10 SISI Test - 3 kHz See SISI Test - 125 Hz

518 10 SISI Test - 4 kHz See SISI Test - 125 Hz

528 10 SISI Test - 6 kHz See SISI Test - 125 Hz

538 10 SISI Test - 8 kHz See SISI Test - 125 Hz

548 10 SISI Test - 12 kHz See SISI Test - 125 Hz

558 10 SISI Test - 8 kHz See SISI Test - 125 Hz

568 10 SISI Test - 9 kHz See SISI Test - 125 Hz

SISI Test - 1.5 kHz See SISI Test - 125 Hz

Fields

Low Frequency Fields

Fields

High Frequency Fields

Fields

1761-0100 Rev. B

578 10 SISI Test - 10 kHz See SISI Test - 125 Hz

Fields

588

598 10 SISI Test - 12.5 kH z See SISI Test - 125 Hz

608 10 SISI Test - 14 kHz See SISI Test - 125 Hz

618 10 SISI Test - 16 kHz See SISI Test - 125 Hz

628 10 SISI Test - 18 kHz See SISI Test - 125 Hz

638 10 SISI Test - 20 kHz See SISI Test - 125 Hz

SISI Test - 11.2 kHz See SISI Test - 125 Hz

Fields

6-21

Grason-Stadler GSI

61 CLINICAL AUDIOMETER

Alternate (ABLB)

Character Number of Data Type

Offset Characters

648

652

656

664

672

680

688

696

slnt

Field Name Field Description

Alternate Te st - -20 to 120 dB x 2 125 Hz Test Ear NR = 260 to 540 Threshold NT = 32768 (0x8000)

Alternate Te st - -20 to 120 dB x 2 125 Hz Masking NR = 260 to 540 Ear Threshold NT = 32768 (0x8000)

Alternate Test - See Alternate Test 250 Hz 125 Hz fields

Alternate Test - See Alternate Test 500 Hz 125 Hz fields

Alternate Test - See Alternate Test 750 Hz 125 Hz fields

Alternate Test - See Alternate Test 1 kHz 125 Hz fields

Alternate Test - See Alternate Test -

1.5 kHz 125 Hz fields

Alternate Test - See Alternate Test 2 kHz 125 Hz fields

704

712

720

728

736

744

752

760

768

Alternate Test - See Alternate Test 3 kHz 125 Hz fields

Alternate Test - See Alternate Test 4 kHz 125 Hz fields

Alternate Test - See Alternate Test 6 kHz 125 Hz fields

Alternate Test - See Alternate Test 8 kHz 125 Hz fields Low Frequency

Alternate Test - See Alternate Test 12 kHz 125 Hz fields

Alternate Test - See Alternate Test 8 kHz 125 Hz fields High Frequency

Alternate Test - See Alternate Test 9 kHz 125 Hz fields

Alternate Test - See Alternate Test 10 kHz 125 Hz fields

Alternate Test - See Alternate Test -

11.2 kHz 125 Hz fields

776

6-22

Alternate Test - See Alternate Test -

12.5 kHz 125 Hz fields

1761-0100 Rev. B

Chapter 6 - Remote Options

Character Number of Data Type Field Name Field Description

Offset Characters

Right Ear Test Data

Record Terminator

Output Record Type 7 -

Instrument Type

784

792

800

808

816

1630

1632

Note: HL threshold values are transmitted as hexadecimal values scaled by 2.

Alternate Test - See Alternate Test -

14 kHz 125 Hz fields

Alternate Test - See Alternate Test -

16 kHz 125 Hz fields

Alternate Test - See Alternate Test -

18 kHz 125 Hz fields

Alternate Test - See Alternate Test -

20 kHz 125 Hz fields

814

See Left Ear fields

uChar Checksum See page 6-4;

Checksums

ASCII Record Terminator “CR,” “LF”

Contains the instrument type and software version information. This record is not GSI 16 compatible.

Character Offset Number of Field Name Field Description

Characters

Record Prefix “:”

Record Type “7”

Instrument Type “04”

Software Revision “xx.xx”

Checksum See page 6-4; Checksums

Record Terminator “CR,” “LF”

1761-0100 Rev. B

6-23

Grason-Stadler GSI

61 CLINICAL AUDIOMETER

Output Record Type 8 - Unit Configuration Record

Contains the information on Dip Swi t c h configuration selections. This record is n ot GSI 16 compatible.

Character Number of Field Name Field Description

Offset Characters

Record Prefix “:”

Record Type “8”

NBN Offset “0” = Custom Narrow Band Noise

WN Offset s “0” = Custom White Noise

Insert Phone Typ e “0” = Paired EARTone

Speaker Type “0” = Basic

Booster Amp “0” = Not in use

offsets in use “1” = Standard Narrow Band Noise offsets in use

offsets in use “1” = Standard White Noise offsets in use

“1” = single insert phone in use

“1” = High Performance

“1” = Booster Amp in use

Bone Vibrator “0” = Forehead

Calibration

Speech Filter “0” = Not in use

Language “0” = English

High Frequency “0” = Other

Phone Typ e “1” = Sennheiser

Phone Coupler “0” = NBS 9A

Type “1” = IEC 318

Insert Phone “0” = IEC 126 (HA1/HA2)

Coupler Type “1” = IEC 711

Speaker Az imuth “0” = 0 degrees

Calibration

High Frequency “0” = installed

Opti on “1” = Not installed

“1” = Mastoid

“1” = Speech filter on use

“1” = French “2” = German “3” = Italian “4” = Spanish

“1” = 45 degrees

6-24

Speech “0” = Custom

Calibration

Checksum See page 6-4; Checksums

Record Terminator “CR,” “LF”

“1” = Sta nda rd

1761-0100 Rev. B

Appendix 1 -T est Words

This appendix consists of two parts.

Part One contains an Alphabetical List of the Spondaic Words Used in Auditory Tests W-1 and W - 2 (SRT). W-1 is a constant level rec ording; W-2 is a descending level recording.

Part T wo contains the words (PB Word Lists) used in Auditory Test W-22 (Discrim ination).

Alphabetical list of the Spondaic Words used in Auditory Tests W-1 and W-2

Appendix 1

Part One

Part Two

1. Airplane 10. Eardrum 19. Iceberg 28. Railroad

2. Armchair 11. Farewell 20. Inkwell 29. Schoolboy

3. Baseball 12. Grandson 21. Mousetrap 30. Sidewalk

4. Birthday 13. Greyhound 22. Mushrooms 31. Stairway

5. Cowboy 14. Hardware 23. Northwest 32. Sunset

6. Daybreak 15. Headlight 24. Oatmeal 33. Toothbrush

7. Doormat 16. Horseshoe 25. Padlock 34. Whitewash

8. Drawbridge 17. Hotdog 26. Pancake 35. Woodwork

9. Duckpond 18. Hothouse 27. Playground 36. Workshop

1. An 14. Low 27. As 40. Jam

2. Yard 15. Owl 28. Wet 41. Poor

3. Carve 16. It 29. Chew 42. Him

4. Us 17. She 30. See (Sea) 43. Skin

5. Day 18. High 31. Deaf 44. East

6. Toe 19. There (Their) 32. Them 45. Thing

7. Felt 20. Earn (Urn) 33. Give 46. Dad

8. Stove 21. Twins 34. True 47. Up

9. Hunt 22. Could 35. Isle (Aisle) 48. Bells

10. Ran 23. What 36. Or (Oar) 49. Wire

11. Knees 24. Bathe 37. Law 50. Ache

12. Not (Knot) 25. Ace 38. Me

13. Mew 26. You (Ewe) 39. None (Nun)

CID Auditory T est W-22 (PB Word Lists)

List 1A

1761-0100 Rev. B

Appendix 1 - 1

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

1. Yore (Your) 14. Now 27. Young 40. Off

2. Bin 15. Jaw 28. Cars 41. Ill

3. Way (Weigh) 16. One (Won) 29. Tree 42. Rooms

4. Chest 17. Hit 30. Dum b 43. Ham

5. Then 18. Send 31. That 44. Star

6. Ease 19. Else 32. Die (Dye) 45. Eat

7. Smart 20. Tare (Tear) 33. Show 46. Thin

8. Gave 21. Does 34. Hurt 47. Flat

9. Pew 22. To (Two, Too) 35. Own 48. Well

10. Ice 23. Cap 36. Key 49. By (Buy)

11. Odd 24. With 37. Oak 50. Ail (Al e)

12. Knee 25. Air (Heir) 38. New (Knew)

13. Move 26. And 39. Live (verb)

1. Bill 14. Oil 27. When 40. On

2. Add (Ad) 15. King 28. Book 41. If

3. West 16. Pie 29. Tie 42. Raw

4. Cute 17. He 30. So 43. Glove

5. Start 18. Smooth 31. Hand 44. Ten

6. Ears 19. Farm 32. End 45. Bull

7. Tan 20. This 33. Shove 46. Through

8. Nest 21. Done (Dunn) 34. Have 47. Chair

9. Say 22. Use (Ye ws) 35. Owes 48. We

10. Is 23. Camp 36. Jar 49. Ate (Eight)

11. Out 24. Wool 37. No (Know) 50. Year

12. Lie (Lye) 25. Are 38. May

13. Three 26. Aim 39. Knit

List 2A

List 3A

List 4A

1. All (Awl) 14. Leave 27. Art 40. Jump

2. Wood (Would) 15. Of 28. Will 41. Pale (Pail)

3. At 16. Hang 29. Dust 42. Go

4. Where 17. Save 30. Toy 43. Stiff

5. Chin 18. Ear 31. Aid 44. Can

6. They 19. Tea (Tee) 32. Than 45. Through (Thru)

7. Dolls 20. Cook 33. 46. Clothes

8. So (Sew) 21. Tin 34. Shoe 47. Who

9. Nuts 22. Bread (Bred) 35. His 48. Bee (Be)

10. Ought (Aught) 23. Why 36. Our (Hour) 49. Yew (You)

11. In (Inn) 24. Arm 37. Men 50. Am

12. Net 25. Yet 38. Near

13. My 26. Darn 39. Few

Appendix 1-2

1761-0100 Rev. B

Appendix 1 - T est W ords

Children’s Spondee List

1. Sidewalk 15. Mousetrap 29. Toothbrush 43. Necktie

2. Birthday 16. Cowboy 30. Dishpan 44. Ash Tray

3. Cupcake 17. Wigwam 31. Bathtub 45. Bedroom

4. Airplane 18. Coughdrop 32. Jackknife 46. Toy Shop

5. Headlight 19. Churchbell 33. Ice Cream 47. Playpen

6. Blackbird 20. Sunset 34. Schoolroom 48. Dollhouse

7. Shotgun 21. Daylight 35. Backyard 49. Highchair

8. Eyebrow 22. Footstool 36. Doorbell 50. Downtown

9. Railroad 23. Pancake 37. Drugstore 51. Meatball

10. Baseball 24. Hotdog 38. Streetcar 52. Sunshine

11. Stairway 25. Outside 39. Hopscotch 53. Barnyard

12. Armchair 26. Scarecrow 40. Jump Rope 54. Bus Stop

13. Playground 27. Playmate 41. Shoelace 55. Football

14. Doorstep 28. Rainbow 42. Hairbrush 56. Bluejay

57. Birdnest

1761-0100 Rev. B

Appendix 1 - 3

Bibliography

American National S tandards Specifications for Audiometers (ANSI Standard S3.6-1989).

American National Standards Specifications for Calibration of Pure Tone Bone Conduction Audiometers (ANSI Standard S3.43-1992).

Acoustics - Standar d Reference Zero for Calibration of Pure T one Audiometers (ISO S tandard 389-1975).

Audiometers - International Electrochemical Commission (IEC 645 - 1992, 1993).

Criteria for Permissible Ambient Noise During Audiometric Testing (ANSI Standard S3.1 -

1977).

Dempsey, James J., 6000 Hz as an Early Indicator of Noise-Induced Hearing Loss, “Ear and Hearing,” V ol. 6, No. 3, 1985, pp. 159-160.

Dirks, Donald D., et al, Bone Conduction Calibration: C urrent Status, “Journal of Speech and Hearing Disorders,” XLIV , May 1979, pp. 143-155.

Dreschler, W.A. et al, Role of High-Frequency Audiometry in Ea rly Detection of Ototoxi city , “Audiology” (1989) 28 (4): 211-20.

Frank, T ., High Frequency Hearing Thresholds in Y oung Adults Using a Commercially Available Audiometer, “Ear and Hearing,” V ol. 11, No. 6, 1990, pp. 450-454.

Grimes, Charles T ., Audiologic Evaluation in Infa ncy and Childhood, “Pediatric Annals,” 14:3 March 1985, pp. 211-219.

Guidelines for Pure-Tone T hreshold Audiometry (ASHA19 - 1989).

Katz, Jack, Hand book for Clinical Audiomet ry (3rd Edition), Baltimore: Williams and Wilkins (1985).

Laurell, G. and Jungnelius, U., High-Dose Cisplatin Treatment: Hearing Loss and Plasma Concentrations, “Laryngoscope,” 1990 July, 100 (7), pp. 725-34.

McRorie, T .I. et al, Aminoglycoside Ototoxicityin Cystic Fibrosis, “Am I Dis Child,” 1989 Nov, 143(11):1328-32.

Margolis, Robert H., et al, Masking with Narrow-Band FM Noise, “J. Ac oust. Soc. Am.,” Vol. 56, No. 2,August 1974, pp. 692-694.

Martin, Frederic N., et al, The Present Status of Audiometric Practice: A Follow-Up Study, “ASHA,” July 1978, pp. 531-541.

Methods for Manual Pure - Tone Threshold Audiom etry (ANSI S3.21 - 1978).

Meyerhoff, W .L., et al,Audiologic Threshold Monitoring of Patients Receiving Ototoxic Drugs, “Ann. Otol. Rhinol. Laryngol.,” 1989 Dec 98: 950-54.

Michael, Paul L., et al, A Comparison of Acoustic Performance Between a New One-piece Earphone Cushion and the Conventional Two-piece MX- 41/AR Cushion, “J. Acoust. Soc. Am.,” 67(2), Feb. 1980.

1761-0100 Rev. B

Grason-Stadler GSI® 61 CLINICAL AUDIOMETER

Morgan, Donald E., et al, Suggested Threshold Sound Pressure Levels for FrequencyModulated (W arble) T o nes in the Sound Field, “J. Speech and Hearing Disorders” XLIV, Feb. 1979, pp. 37-54.

Reference Equivalent Threshold Force Levels for Audiometric Bone V ibr ators (ANSI Standard S3.26 - 1981).

Royster , Julia D., Audiometric Evaluations for Indust rial Hearing, “Sound and Vibr ation,” May 1985, pp. 24-29.

Studebaker , Gerald A., Clinical Masking of Air - and Bone-Conducted Stimuli, “J. Speech and Hearing Disorders,” Vol. 29, No. 1, Feb. 1964, pp. 23-35.

Swanson, D.J., et al, Erythromycin Ototoxicity: Prospective Assessment With Serum Concentration and Audiograms in a S tudy of Patients with Pneum onia, Am. J. Med., Jan 19 92 (1):61-8.

Weatherly, R.A., et al, Cis-Platinum Ototoxicity in Children, “Laryngoscope” 101 (9), 1991 Sept: 917-24.

Underwriter’ s Laboratory Safety S tandard (544 - For Medical and De ntal Equipment).

Bibliography for T est Pr ocedures

Beagley , H.A. and Barnard, S., Manual for Audiometric T echniques, Oxford University Press,

1982.

Buus, S., Florentine, M., Redden R., The SISI T e st, “Audiology ,” 21, pp. 273 - 293, 365-385,

1982.

Harbert F . And Young, I. M., Threshold Auditory Adaption, “J. Aud. Res.” 2, pp. 273-293, 365385,1982.

Hattler, K. W. and Shuman, G . I., Efficiency of the Stenger , Doefler -Stewart and Lengthened OFF-Time B ekesy T ests. “Acta Oto laryngol., 72, pp. 262-2 67, 1971.

Hood, J. D., Loudness Balance Procedure for the Measurement of Recruitment, “Audiology ,” 16, pp. 215-228, 1977.

Jerger , J. and Jerger, S., A Simplified Tone Decay Test, “Arch. Otolaryngol., 101, pp. 403-407,

1975.

Jerger , J. and Tillman, T .,ANew Method for the Clinical Determination of Sensorineural Acuity Level (SAL), “Arch. Otolaryngol.” Vol. 71, June 1960, pp. 948 -955.

Katz, J., Handbook of Clinical Audiology, W illiam and W iltkins, 3rd Edition, 1985.

Katz, J., The SSW Test: An Interim Report, “J. Speech and Hearing Disorders,” 33, pp. 132-146,

1968.

Newby , H.A., Audiology, Forth Edition, Prentice-Hall, 1979.

Olsen, W. O. and Noffsinger, D., Comparison of One New and Three Old Tests of Au ditory Adaption, Arch. Otolaryngol. 99, 1974, pp. 94-99.

Owens, E., Tone Decay in Eighth Nerve and Cochlear Lesions, J. Speech Hear. Disord., 29, 1964, pp. 14-22.

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Regulatory Symbols

No. Symbol IEC Pub. Description

980

Symbol for "DO NOT REUSE"

980

Symbol for "USE BY"

LOT

980

Symbol for "BATCH CODE"

4 SN 980

Symbol for "SERIAL NUMBER"

STERILE

980

Symbol for "STERILE"

STERILE EO

STERILE R

STERILE

980

Symbol for "STERILIZE", including the "METHOD FOR STERLIZATION

Symbol for method of sterilization using irradiation

Symbol for method of sterilization using steam or dry heat

1761-0100 Rev. B

REF

980

Symbol for "CATALOG NUMBER"

Symbol for “European Representative”

Symbol for “Manufacturer”

980

Symbol for “Date of Manufacture”

C-1

GSi 61 User Manual

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User Manual