AmpliVox 270+ User Manual

270+
Operating Manual

AmpliVox 270+ Specifications

General

Type	Sound Level Meter
Power Supply	9V battery
Measurement Range	30 - 130 dB
Frequency Range	31.5 Hz to 8 kHz
Frequency Weighting	A, C
Response Time	Fast, Slow
Display	LCD
Weighting Networks	A, C
Time Weighting	Fast, Slow
Microphone	1/2 inch Electret Condenser

Summary

1. INTRODUCTION

1.2. INTENDED APPLICATIONS

Details the professional users and the scope of the audiometer's capabilities.

1. ACCESSORIES AND WARNINGS

1.5. WARNINGS

Clarifies the meaning of warning and caution labels used throughout the manual.

2. UNPACKING AND INSTALLATION

2.3. SAFETY INSTRUCTIONS

2.3.1. General

General safety measures for operating electrical equipment and user responsibilities.

2.3.2. Cautions - General

General cautions to observe when operating the device.

2.3.10. Mains Supply Operation

Details safe operation using the mains adapter.

2.3.4. Electrical and electrostatic safety

Details safety for electrical connections, static discharge, and modifications.

2.3.5. Electromagnetic compatibility (EMC)

Guidance on avoiding interference and ensuring EMC compliance.

3. PRINCIPLES OF OPERATION

3.2. PRINCIPALS OF PURE TONE AUDIOMETRY

Explains the process of measuring hearing thresholds using pure tones.

3.3. PRINCIPALS OF SPEECH AUDIOMETRY

Describes the use of speech audiometry for assessing hearing loss and fitting aids.

4. USING THE 270+

4.1. GENERAL PRECAUTIONS

Lists essential precautions to observe while operating the audiometer with patients.

4.2. SWITCHING THE INSTRUMENT ON AND OFF

Details how to switch the instrument on and off safely and efficiently.

4.6. FUNCTION BUTTONS

4.6.1. PRESENTING A TONE

How to use the 'PRESENT' button to deliver or interrupt test signals.

4.6.3. TALKOVER AND TALKBACK

Instructions for using the talkover and talkback features for patient communication.

4.6.6. SIGNAL

4.6.6.1. SELECTION OF TONE AND SPEECH MODULE

How to switch between Tone and Speech audiometry modes.

4.6.8. MASK (ACTIVATE MASKING)

4.6.10. AUTO (AUTOMATIC TESTING)

Setting up manual or automatic tone audiometry test procedures.

4.6.12. SPECIAL (SPECIAL TEST SELECTION)

4.7. MENU

4.7.2. CONFIGURATION

Modifying settings for present time, speech units, gain, masking, etc.

4.7.2.1. Auto-TEst Settings

Customizing parameters for automatic audiometry tests like retry count and frequencies.

4.8. PERFORMING PURE TONE AUDIOMETRY

4.8.3. PERFORMING PURE TONE AUDIOMETRY

Step-by-step guide for performing pure tone audiometry tests.

4.8.4. MASKING (PURE TONE AUDIOMETRY)

Details on using masking with bone conduction and different masking intelligence levels.

4.8. MASKING (PURE TONE AUDIOMETRY)

4.8.4.1. BC MASKING TRANSDUCERS

Using masking earpieces for bone conduction tests.

4.8.4.2. MASKING INTELLIGENCE

4.8. AUTOMATIC TESTING

4.8.5. AUTOMATIC TESTING (PURE TONE AUDIOMETRY)

How to perform automated tone audiometry with or without masking.

4.9. PERFORMING SPEECH AUDIOMETRY

4.9.1. GENERAL

4.9. SPEECH TESTING PROCEDURES

4.9.4. USING LIVE SPEECH (EMIC.)

4.9.5. USING RECORDED SPEECH (LINE)

4.9.6. MEASURING THE SRT SCORE

Using the counter to measure SRT and interpret results.

4.9. MASKING AND FREEFIELD SPEECH

4.9.7. MASKING (SPEECH TESTING)

4.10. PERFORMING SPECIAL TESTS

4.10.1. STENGER (TONE AUDIOMETRY)

How to perform the Stenger test to identify pseudohypacusis.

4.10.2. PERFORMING ABLB

4.10. SPECIAL TESTS - SISI, MHA, HLS, DECAY

4.10.3. PERFORMING SISI

4.10.4. PERFORMING MHA

4.10.5. PERFORMING HLS

4.10.6. PERFORMING DECAY

4.11. TRANSFERING DATA TO PC

Data Transfer to Noah and AmpliSuite

5. ROUTINE MAINTENANCE

5.1. GENERAL MAINTENANCE PROCEDURES

5.2. CLEANING THE 270+

5.3. CLEANING THE ACCESSORIES

6. TECHNICAL SPECIFICATIONS

6.1. STANDARD AND REGULATORY

6.3. TONE AUDIOMETRY

6.4. SPEECH TESTING

7. EMC GUIDANCE & MANUFACTURER'S DECLARATION

EMC Precautions for Hospital Use

Essential Performance and EMC Compliance

EMC Emissions and Immunity

Electromagnetic Emissions Guidance

Electromagnetic Immunity Guidance

Immunity to Voltage Variations and RF Fields

Electromagnetic Immunity Guidance (Continued)

RF Communications Equipment Separation

8. APPENDIX A - FREE FIELD CALIBRATION PROCEDURE

General Calibration Overview and Assurance

8.5. FREEFIELD SPEECH CALIBRATION

Speech Channel Equalisation and Level Setting

Step-by-step guide for equalising the speech channel and setting SPL.

8.6. FREEFIELD WARBLE TONES CALIBRATION

Warble Tone Calibration Procedure

Procedures for entering calibration mode and adjusting levels for warble tones.

8.7. FREEFIELD LIVE SPEECH CALIBRATION

Live Speech Calibration Considerations

Caveats on using live speech for audiometry and the required skill.