Vitalograph Spirotrac Instructions for Use
IFU Part No.: 07402
Issue 22
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Page 60 of 78 DT_0006-15
1. Toggle common/separated masking – Set masking levels for each frequency.
2. Turn masking on/off.
3. Masking dB level down.
4. Masking dB level up.
5. Turn masking lock on/off – The masking follows the tone attenuator control.
6. Masking level dB.
4.9.3.3 Automatic Tests
20 dB test
Automatic screening test with a default hearing level set to 20 dB. The hearing level
will increase in 5 dB steps until the subject responds. When the subject responds, the
frequency changes to the next frequency and the hearing level is reset to 20 dB. The
procedure is repeated for every new frequency. The test will continue until all
frequencies have been tested on both ears.
20 dB random test
Only available with Advanced and Diagnostic device
A randomised version of the 20 dB test automatic screening test. The test starts at
default hearing level of 20 dB at 1000 Hz to the right ear and then 20 dB at 1000 Hz to
the left ear. Afterwards, the test will randomly switch between frequency and ear until
all frequencies have been tested on both ears.
Hughson Westlake automatic test
Only available with Advanced and Diagnostic device
The Hughson Westlake test is an automatic threshold test. The test starts at 1000 Hz
and a default hearing level of 20 dB in the right ear. The hearing level will
automatically increase in 5 dB steps until the subject responds and will drop 10 dB
when a subject responds. The test requires the subject to respond to 2 out of 3
presentations of the same hearing level at each frequency before moving on to the
next frequency.
Once the test has finished in the left ear, the same procedure is automatically
repeated in the right ear before the test is completed.
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