Tremetrics RA660, Operation Manual

Page: 38 / 79

RA660 Operation Manual
8509790 Rev. 2 36 18/04/2018
5.5.5 Plug Status
The RA660 headphones, response switch and room monitor microphone have an
identification circuit that allows the RA660 audiometers to determine if the proper
accessories are connected to the correct jacks. If everything is corrrect the plug icon
on the details screen is green, if there is a connection error the plug icon is red.
Connections Correct Connection Error
A plug connection error will not prevent operation of the unit, but it does indicate a
potential problem that shoul be investigated. If an accessory need to be changed the
identification circuit can be reset by right clicking on the plug icon. You will be
promted for a password before the identification can be reset.
5.6 Perform a Daily Biological
5.6.1 Integrated Bio-acoustic Simulator
The RA660 has an integrated bio-acoustic simulator which is an OSHA acceptable
substitute for a human subject for performing the Daily Audiometer Calibration Check.
The process, often referred to as the Daily Biological, is intended to verify the
audiometer calibration and cannot be used to perform the annual audiometer
calibration. Also, the RA660 implements the
equally important “Listening Check” by
guiding the test administrator through the process of confirming tone stimulus quality.
The Daily Biological should be performed at the start of each day of testing.
5.6.2 The Automated Daily Biological
1. Place the audiometer headphones on the RA660 with the red right earphone
in the red coupler) and the blue left earphone in the blue coupler. Be sure
that the earphone cushions are seated properly as show below and fully
inside the couplers. The cushions should be replaced if they do not fit inside
the couplers.