SEQUENCE OF OPERATION AND SUGGESTED TEST PROCEDURE
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OM033-4 - CA850 Series 5 Operating Manual
5
SEQUENCE OF OPERATION AND SUGGESTED TEST
PROCEDURE
5.1
PATIENT DATA ENTRY
Press the TEST button and then the
‘New Person’ softkey to clear any existing patient data. Enter the required
data as described in Section 9.2. The first line of data to be input is the patient number. As this is the reference
number for all other data (including audiometric test results)
it is essential to use a unique patient number
for each patient
.
Press the
‘Next page’ softkey to advance to the Audiogram page.
5.2
MANUAL TESTING
The following notes are for guidance only
– refer also to ISO 8253.
Use the
‘Erase’ softkey and then the ‘This test’ softkey to clear any existing test data.
Use LEFT/RIGHT keys to select the ear to be tested
– an indicator above the selected key will illuminate
green. Use the
and
keys to change the frequency and the
and
keys to change the tone level. The
values are indicated on the bottom line of the display. Press the PRESENT key to present a tone to the patient
– an indicator above this key will illuminate green.
If the patient indicates that the tone has been heard, the level is decreased in 10dB steps until the patient
cannot hear the tone. Then increase the level by 5dB until the tone has been heard. Repeat the process until
there are 3 responses at the same level in 5 ascending series. Continue to the next frequency to be tested.
Press the
‘Plot point’ softkey to record the threshold, and then repeat the above steps at each required
frequency for both ears.
5.3
BEKESY AND COMPUTER TESTING
If necessary, switch between these test methods as described in Section 11.2.3.
Press the ‘Run Test’ softkey and then press a softkey to specify a test on both ears, the currently selected ear
or a single test using the currently selected ear & frequency combination.
For a both-ear or a single-ear test the option of running a familiarisation routine prior to the test is provided.
The message "Do you want to familiarise?" will appear at the top of the display. (Familiarisation is not available
for a single frequency test.)
a)
Press ‘Yes’ to run the familiarisation routine prior to the test, or
b)
Press ‘No’ to run the test without familiarisation, or
c)
Press ‘Left ear’ to run the test with familiarisation only in the left ear (this option is only available for a
both-ear test).
After successful completion of the familiarisation routine the test will start automatically and will be performed
according to the test criteria and options selected (Section 11.2).
While the test is in progress the option to pause the test is available -
press the ‘Pause’ softkey. The Talkover
function may then be used if required and the test may be resumed by using the indicated softkeys to repeat
the frequency that was being tested, move to the next frequency or cancel the test.
The time available for the patient to respond in Bekesy mode is from the point the
tone is presented until the point when the next tone in the sequence is presented.
In Computer mode the time to respond is from the point the tone is presented to the
beginning of the next presented tone (approximately 2.3 seconds maximum). If a
response is made within this time period a random delay is then added to the time
until the next tone is presented.
