AmpliVox ER75 - Testing the Response Indicator; Sequence of Operation and Suggested Test Procedure

USING THE ER75
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D-0115622-C (OM011) – ER75 Operating Manual
3.5. TESTING THE RESPONSE INDICATOR
Present an audiometer tone (1kHz, 80dBHL) and check that the indicators on the ER75 and the audiometer
labelled “response” illuminate green.
3.6. SEQUENCE OF OPERATION AND SUGGESTED TEST PROCEDURE
3.6.1. GENERAL
In use the ER75 simulates the actions of a patient responding to an audible stimulus. If a tone level greater than
approximately 75dBHL is provided via the audiometric headset a response signal is output to the audiometer.
The ER75 can detect tones at a range of audiometric frequencies and may be used with Amplivox audiometers
operating in both manual and automatic modes.
3.6.2. PRE-TEST
(1) Set the audiometer up as normal with the exception of the patient response switch which should remain
unconnected
(2) Place the earphones over the earphone couplers on the ER75
(3) Connect the patient response interconnecting lead, supplied with the ER75, between the audiometer and
the ER75
(4) Switch the ER75 and the audiometer on.
3.6.3. TEST PROCEDURE FOR MANUAL AUDIOMETERS
(1) Set the audiometer step size to 2.5dB if this facility is available
(2) Present the first test tone at 65dBHL at 1kHz to the left headphone
(3) If the ER75 responds by illuminating the response indicator on the audiometer return the ER75 for
service & verification; if there is no response, move to step 4
(4) Increase the signal level in steps until the ER75 responds - this should occur at approximately 75dBHL;
record this signal level on an audiogram form
(5) Select the next test frequency
(6) Repeat steps 2 to 5, testing the frequencies in the following order: 1kHz, 1.5kHz, 2kHz, 3kHz, 4kHz, 6kHz,
8kHz, 250Hz and 500Hz.
(7) Repeat steps 2 to 6 for the right headphone
3.6.4. TEST PROCEDURE FOR AUTOMATIC AUDIOMETERS
(1) Run the automatic test sequence (using the ‘Bekesy’ test mode if this is available)
(2) Print a copy of the results
(3) If responses are made at any frequency at levels of 65dBHL or less return the ER75 for service &
verification
3.6.5. ACTION FOLLOWING TEST PROCEDURE
Compare the results with the response levels supplied originally with the ER75, or with the most recent
response levels if the ER75 has been re-calibrated. The audiometer should be returned for service &
verification either to Amplivox or to the designated distributor if the two sets of results differ by more than that
specified in the routine checking regime that has been established by the user organization (see ISO 8253-
1:2010).