Sequence Of Operation And Suggested Test Procedure; Pre-Test; Test - Siemens SD 270 Operating Manual

4 Sequence of Operation and
Suggested Test Procedure
The following applies to air conduction measurements – refer also
to ISO 8253 for further guidance.

4.1 Pre-test

1. Switch the audiometer on.
2. Perform a listening check. (see 8.4)
3. Decide whether to use the Threshold Retention Function, the
Store on 2 of 3 option, or an audiogram card to record the
thresholds.
4. Position the audiometer so that the patient cannot see the con-
trol panel or any movement of the operator's hands.
5. Fit the headset to the patient and use the TALKOVER key to give
the following instructions to the patient:
"As soon as you hear the tone, press the response switch.
When you no longer hear the tone release the response
switch."
6. Select the better hearing ear (according to the patient) by
pressing either the LEFT or RIGHT key.

4.2 Test

7. Present the first test tone at 30dB at 1kHz.
8. If the patient responds, reduce the signal level in 10dB steps
until they no longer respond; then increase the signal level in
5dB steps until the patient responds.
9. If the patient fails to hear the first tone, increase the signal le-
vel in 5dB steps until they do respond and then continue with
step 10.
10. Repeat the test by reducing the signal level in 10dB steps until
the patient no longer responds; then increase the signal level
in 5dB steps until they do respond and note this level.
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