TSI Quest BA-202 Bedienungsanleitung

BIO-ACOUSTIC SIMULATORS

MODEL BA-202

USER MANUAL

Bio-Acoustic Simulator Models:

BA-202 Bio-Acoustic Simulator User Manual

BA-202-25 includes Octave Monitor with OSHA Requirements

Bio-Acoustic Simulator Model BA-202

Table of Contents

Bio-Acoustic Simulator Models ..............2

General Description .................................2

BA-202 Model Explained .......................3

BA-202-25 Model Explained..................3

Operating Procedure................................4

Operation Outside of the Audiometric

Room .................................................4

Operation Inside of the Audiometric

Room .................................................4

Microphone Location (BA-202-25).........5

Battery Test (Battery Operation Only) ...5

General Operational Considerations .....5

Testing a Manual Audiometer................6

Testing an Automatic Audiometer .........6

Testing Audiometric Room Noise (BA-

202-25)...............................................7

Testing Audiometric Room Notes:.........8

Specifications ...........................................8

Bio-Acoustic Simulator (BA-202

model)................................................8

BA-202-25 (model) Octave Monitor

(OSHA version)..................................9

General Features.................................10

Controls (See Figures 1, 2, and 3) ......10

Principles of Operation..........................11

Bio-Acoustic Simulator Models

Block Diagram ........................................12

Response Output Jack and Wiring......13

Wiring ..................................................14

Battery Replacement...........................14

Volt Power Adapter..............................15

Maintenance and Calibration...............15

Headphone Calibration Check

(Left/Right Earphone) ......................15

Octave Monitor Calibration.................. 16

Microphone Care................................. 16

Preamplifier Care.................................17

Recommendations..........................17

Contact/Service information .................18

Technical Support Contacts ................18

Service Contact Information ................ 18

Returning for Service...........................19

Calibration...............................................19

Warranty.................................................. 20

Figures

Figure 1: Model BA-202 Bio-Acoustic

Simulator..........................................2

Figure 2: Model BA-202-25 Bio-Acoustic

Simulator & Octave Monitor

(OSHA) ............................................3

Figure 3: Block Diagram, Models

BA-202 and BA-202-25 .................12

Figure 4: Response Jack Wiring .............13

Tables

Table 1: Typical HL Values for Various

Earphones on Audiometer with 5 dB

Attenuator Steps. These levels are

just for reference to see if the

audiometer is relatively correct the

first time that it is tested...................7

Table 2: Allowable Room Noise

Specified by Various Regulations.... 8

2 Bio-Acoustic Simulator Models

Bio-Acoustic Simulator Model BA-202

Bio-Acoustic Simulator Models

Model

Description

BA-202

Bio-Acoustic Simulator

BA-202-25

Bio-Acoustic Simulator & Octave Monitor

OSHA Requirements for Octave Levels (Type 2 accuracy)

General Description

The Bio-Acoustic Simulator Model BA-202 (Figure 1) is a high-quality measuring

device used to fulfill the requirements for daily biological tests of audiometers.

The Bio-Acoustic Simulator Model BA-202-25 also provides the capability to

continuously monitor room noise in octaves during an actual hearing test. This

ensures compliance to either the OSHA or ANSI allowable background noise

limits for audiometric test rooms.

Figure 1: Model BA-202 Bio-Acoustic Simulator

3 General Description

Bio-Acoustic Simulator Model BA-202

Figure 2: Model BA-202-25 Bio-Acoustic Simulator & Octave Monitor (OSHA)

BA-202 Model Explained

The BA-202 series simulator is simply substituted for a human test subject, thus

eliminating the need to use the same person with a known hearing threshold

level. The Bio-Acoustic Simulator’s performance is consistent every day. This

eliminates the variables that can be present when using a human test subject

whose hearing can be affected by such things as a head cold, allergy,

recreational noise exposure, etc. Either model will provide a reference audiogram

when the simulator is connected to a manual or automatic audiometer.

BA-202-25 Model Explained

Audiometric room background noise can easily be monitored during the

audiogram by using the Octave Monitor capability of the BA-202-25 (OSHA

levels). Other factory-set octave levels can be special ordered if requested by the

purchaser.

4 Operating Procedure

Bio-Acoustic Simulator Model BA-202

Operating Procedure

Operation Outside of the Audiometric Room

The unit is intended to be wall-mounted in an audiometer test room. However, the

unit can be operated as a table-top unit outside of the test room if desired. When

used in this manner, the four rubber feet (sticky adhesive backing, provided) will

need to be installed on the back four corners of the unit. When performing the

biological check, the headphones have to be unplugged from the room

connection jacks, brought to the location of the audiometer and simulator, and

reconnected to the audiometer jacks. Also, for the BA-202-25, the microphone

cable must also go from the unit to the inside of the audiometric room and must

hang down from the ceiling (with only 10 feet of microphone cable provided).

Considering these inconveniences, it is much easier to use the unit when

mounted inside of the audiometric room on the wall as follows.

Operation Inside of the Audiometric Room

All models have been designed to be mounted on an inside wall of an audiometric

room with two screws (pan head style, not provided) and a Velcro®brand fastener

(provided). A suggested location would be on the inside of the test room on the

wall opposite the operator's viewing window. It should also be located where the

subject's head will not interfere with the viewing of the indicator lights. When a

good location is determined, fasten the unit as follows:

1. Locate the long slot on the back of the chassis. This slot is intended to slide

onto the screw heads. The four rubber feet are not used when wall-mounting

the unit.

2. Mark the location for the two mounting screws, approximately 3½ inches

apart.

3. If necessary, make two small "starting" holes in the room wall for the screws.

4. Screw the two screws into the wall. Let the screw heads protrude just far

enough so that the long slot on back of the unit will slide onto them. Test to

be sure that the unit slides onto the screw heads.

5. There are two Velcro®brand fasteners on the back of the unit. The "hook"

patch is fastened to the unit; the "loop" patch is stuck onto the "hook" patch.

Peel the backing from the "loop" patch.

6. Slide the unit onto the screw heads while holding the sticky Velcro®brand

fastener surface away from the wall.

7. Once the unit is centered on the screw heads, press the bottom of the unit

firmly against the wall so that the patch sticks to the wall.

®Velcro is a registered trademark of Velcro Companies.

5 Operating Procedure

Bio-Acoustic Simulator Model BA-202

8. The unit is now fastened securely. The Velcro®brand fastener holds the unit

from sliding sideways off of the screws.

To remove the unit from the wall, pull the bottom away from the wall to separate

the Velcro® brand fastener. Then slide the unit to the side.

After sticking the unit's patch to the wall, you may want to remove the unit from

the wall and firmly press the Velcro®brand fastener to the wall to ensure proper

bonding.

Microphone Location (BA-202-25)

The model BA-202-25 requires the use of a cable-mounted microphone to

operate the octave band filters. It is recommended that the microphone be

suspended by its cable close to the ceiling of the audiometric room. Also locate it

in the best position so that the test subject's head will not interfere with it when

entering and leaving the room. Be sure to attach the cable in such a fashion so

that it can be easily removed from the ceiling mount for periodic calibration. The

use of a "screw-type" hook is one way to attach it. Since room ceiling material

varies, use the best method for that type of material.

Battery Test (Battery Operation Only)

Press the ON button to turn the power on. The POWER indicator lamp will flash,

indicating that the battery voltage is sufficient. If this light does not flash, the

battery is too low to operate the unit. When the battery weakens and approaches

the end of its useful life, the intensity of the flashing will lessen and finally

disappear.

General Operational Considerations

The Bio-Acoustic Simulator section checks the audiometer earphones in the

45 dB HL to 75 dB HL range. Therefore, it is important to have a relatively quiet

background when performing the HL tests. All tests should be performed within

an audiometric room for best results.

An original BIOLOGICAL LOG should always be made when the audiometer has

just come back from having an exhaustive calibration. Every successive

BIOLOGICAL LOG should then be compared against the original. By doing this,

as long as the new HL values are within ±5 dB of the original BIOLOGICAL LOG,

the audiometer accuracy is acceptable to begin testing of patients. See Table 1,

for typical HL values for audiometers with 5 dB HL steps.

Table 1 requires that you know the model of headphone that your audiometer

uses. Refer to the audiometer instruction manual. If you cannot find what you

6 Operating Procedure

Bio-Acoustic Simulator Model BA-202

need from the manual, you will need to disassemble one earphone (removing

either the red or blue cup) to read the model of the headphone.

Testing a Manual Audiometer

A typical test procedure would be as follows:

1. Switch the audiometer on and allow it to stabilize per manufacturer's

specifications.

2. Place the earphones onto the Bio-Acoustic Simulator.

3. Turn the Bio-Acoustic Simulator on.

4. Starting at 125 Hz (or the lowest frequency) and 40dB HL on the Left (Blue)

earphone, increase the HL value until the LEFT indicator light appears.

Repeat a few times to be confident of the HL value. Record the HL value.

Repeat this step for all frequencies on the audiometer.

5. Repeat step 4 with the Right (Red) earphone.

6. Keep a BIOLOGICAL LOG of this data. Always compare the new HL values

to the original BIOLOGICAL LOG that was established early in the present

calibration interval of the audiometer. All data should compare within ±5 dB

of the original BIOLOGICAL LOG. See Table 1 for HL value ranges.

Testing an Automatic Audiometer

A typical test procedure would be as follows:

1. Switch the audiometer on and allow it to stabilize per manufacturer's

specifications.

2. Connect the RESPONSE CABLE (059-995) between the patient response

jack of the audiometer and the RESPONSE jack of the Bio-Acoustic

Simulator.

3. Place the earphones onto the Bio-Acoustic Simulator.

4. Turn the Bio-Acoustic Simulator on.

5. Run the audiometer through its normal testing sequence. An audiogram will

be produced.

6. Keep a BIOLOGICAL LOG of this data. Always compare the new HL values

to the original BIOLOGICAL LOG that was established early in the present

calibration interval of the audiometer. All data should compare within ±5 dB

of the original BIOLOGICAL LOG. See Table 1 for typical HL values.

7 Operating Procedure

Bio-Acoustic Simulator Model BA-202

Frequency

TDH-39

TDH-49

TDH-50

Telex

1470

Insert

Earphone

125

55 to 70

50 to 65

55 to 70

250

60 to 70

55 to 70

500

60 to 70

55 to 70

750

60 to 70

55 to 70

55 to 65

60 to 70

55 to 70

1.5K

55 to 65

55 to 70

55 to 65

50 to 60

60 to 70

55 to 70

50 to 60

55 to 65

55 to 70

50 to 65

55 to 70

45 to 60

50 to 65

55 to 70

60 to 75

55 to 70

Table 1: Typical HL Values for Various Earphones on Audiometer with 5 dB

Attenuator Steps. These levels are just for reference to see if the audiometer is

relatively correct the first time that it is tested.

Testing Audiometric Room Noise (BA-202-25)

Room noise within an audiometric room can be tested either continuously or

periodically depending on various conditions that are producing the noise.

However, TSI recommends that this test be performed continuously while test

subjects are being evaluated. Testing is performed as follows:

1. Hang the microphone from the ceiling slightly above the test subject's head.

2. Turn the BA-202-25 on.

3. With the door closed, occasionally view the frequency indicator lights on the

monitor. They should not be on. If the frequency lights are activating at

random, these frequencies are in violation and the subject's test should be

halted. The offending sound source(s) should then be located and

eliminated. If elimination is not possible, either the audiometric booth should

be moved to a quieter location or the test should be scheduled for a more

quiet time. See Table 2 for the allowable values.

8 Specifications

Bio-Acoustic Simulator Model BA-202

Frequency

(in Hz)

OSHA Values

8-Mar-83 *

ANSI Values

S3.1, 1999 **

Values on

Special Order

***

125

-----

35 dB

250

-----

25 dB

500

40 dB

21 dB

40 dB

26 dB

47 dB

34 dB

57 dB

37 dB

62 dB

37 dB

Table 2: Allowable Room Noise Specified by Various Regulations

Testing Audiometric Room Notes:

* The BA-202-25 is set at these values unless otherwise indicated.

*** Contact TSI (See Customer Service section) for special room noise limits that

can be ordered for the BA-202-25. TSI can also modify values for other special

requirements.

NOTE: There is a charge for this modification. Write special values here for

reference if you want to do so.

Specifications

Bio-Acoustic Simulator (BA-202 model)

Test Frequencies

125 Hz to 8 kHz

Calibration

60 HL ±1 dB at 1 kHz continuous tone with TDH-39,

TDH-49, or TDH-50 earphones.

Accuracy

Repeatable to within 2 dB when using an audiometer

with a continuously variable HL control. When using

automatic audiometers, the BA-202 will be repeatable

within the HL step increments of the audiometer (usually

5 dB).

Hysteresis

10 dB ±1 dB between ON and OFF indication for the

LEFT/RIGHT headphone indicators when used with

continuous tone input. This means once activated, the

LEFT/RIGHT headphone signal must be lowered by at

least 10 dB to deactivate the Indicator Light and Relay.

Indicators

3 LEDs—RIGHT, LEFT, and POWER.

Transducers

Two independent Electret Microphones.

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