User's Manual

40
If an RECD unit is being used, the calibration of the reference
microphone must be validated by technicians approved by Inventis
S.r.l. The operation should be carried out at least once every 12
months, and whenever the coupler is replaced.
4.2 PERIODIC CHECKS
To maximize the service life of the instrument and all its accessories, it is
advisable that the following tests be carried out on a daily basis:
The tests must be conducted with the instrument positioned for
normal use. For more information, refer to the Maestro software
manuals.
- Before switching on the instrument, check that all the accessories are
properly connected and that the cables and/or connectors, as well as all
other components, are neither broken nor damaged externally.
- Run the calibration procedure for the probe microphones with a new
probe tube to make certain they are functioning correctly.
- Check subjectively that the outputs when using air conduction and bone
conduction are the same for both channels and at all frequencies.
Conduct this test at 10 or 15 dB HL, a level sufficient to verify that the
stimulus signal has been presented. The person who carries out this test
should have optimum hearing.
- Check each frequency at 60 dB HL in AC mode and at 40 dB HL in BC
mode: there must be no distortion, noise or parasite signals.
- Check for correct operation of the patient response button.
- Check the voltage of the earphone headset and the bone vibrator
- Check communication with the patient.
4.3 CLEANING AND MAINTENANCE OF TRANSDUCERS
Do not use liquids or sprays to clean the Trumpet. When cleaning
the device, use a soft cloth moistened with a mild detergent.
The headphone cushions and the bone vibrator are made of biocompatible
material, but are not sterile. To avoid the possible spread of infection when