SM010-3 Siemens SD 270 Operating & Service Manual Page 27
Display Counter
The Display Counter is available only in Speech mode. Use Softkey 3 to
activate the counter. For any given level of stimulus the display then
shows the percentage correct alongside the total number of responses. To
use the counter the operator selects ‘YES’ or ‘NO’ according to the
response made by the patient. Pressing Softkey 3 clears the counter to
zero. To exit from the Display Counter screen press Softkey 4. Any results
will be saved and further results may be added to those already
established (use Sofkey 3 to activate the counter again).
1. Live Voice Speech Audiometry to Headphones
1.1
Set Up:
a) Connect a microphone to the MIC1 input on the audiometer
b) Press SPEECH and use Softkey 1 to ensure that ‘MIC’ is displayed in
capitals (indicating that the external microphone is selected)
c) The microphone is initially routed to the left earphone. To select the
right earphone press RIGHT
d) The input signal is adjusted in 1dB steps by use of the MASK rotary
control
e) Input signal adjustment should be made to adjust for the operator’s
voice to peak at the 0dB point on the LEVEL dB bar graph; the
earphone output will then be 89dBSPL for a SIGNAL setting of 70
dBHL and 1kHz puretone into an IEC 318 ear simulator
f) The output level is controlled in 5dB steps by the SIGNAL control
1.2
Procedure:
The operator may now read the required word list to the subject and
record the responses; the patient may respond either by (a) repeating the
spoken material or (b) writing the words. If the response is spoken, the
operator should press the TALKBACK key to hear this response (see
operator monitoring above).
2. Live Voice Speech Audiometry with Contralateral Masking
2.1
Set Up - as described in 1.1 then:
a) Select MASK
b) Speech-weighted masking is now routed to the opposite earphone to
that selected