DAILY BIOLOGIC CHECK OF AUDIOMETERS
An audiometer must be checked before each day of use or if a problem is suspected with
the equipment during use. After the audiometer is turned on, the operator should listen to
the signal at different dial settings through each transducer that may be used in testing.
In order to do a daily biologic check, the operator should:
Check the cords for signs of wearing or cracking.
Check all connection points for secure insertion.
Check the audiometer for loose dials or dials that are out of alignment.
Check that the earphones are securely attached to the headset.
After putting on the headsets, present a tone and make sure it comes through the
Turn the attenuator dial from minimum to maximum levels and listen for
increases and decreases in loudness. Be sure to increase the attenuator to high
intensity levels. In addition to presenting the tone at these high intensity levels,
allow the tone to be absent to listen for hum.
For screening purposes, check the screening levels to be used at each frequency.
Make sure that the sounds, which the client is expected to hear, can be heard in
If the equipment is to be used for threshold testing, then the threshold of the
clinician (or a person with known thresholds) should be checked.
Turn the frequency dial with the attenuator set at a comfortable loudness and
listen to each frequency.
Jiggle the earphone cords and listen for continuous tone presentation. A
defective cord will produce static or cause the tone to be intermittent.
All transducers that will be used in testing must be checked.
In all of the above situations listen for audible clicks, discontinuous presentation of the
tone, crosstalk between the earphones, static, hum, background noise, a dead earphone, or
any undesired interference with the presentation of the tone. If problems exist that cannot
be solved, then testing cannot be done. Document the quality control data on the