Your Test Area
The small size (1 - 2.5 microVolt @ 90dB stimulation) of typical ABR response signals makes it
especially important to minimize electrical noise in the test area and to ensure all conditions
are carefully controlled during testing. Be sure to consider the elements detailed below in
setting up your testing area.
Grounding
Use a designated and grounded electrical outlet.
Enclosure Considerations
Many labs are full of cables, metal structures and other items that generate noise as well as
electrical wires that serve as antennas for electrical noise. We recommend using a sound
attenuating chamber with a built in Faraday cage for ABR testing. It is equally important to use
good practices when using the selected enclosure. A mains power cord that extends from
outside the enclosure to inside the enclosure undermines its integrity.
To maintain the integrity of the enclosure:
Keep AC electrically powered devices (wall/mains powered) outside.
Ensure the preampli
fi
er is completely inside your enclosure.
Ensure the preamp charger is unplugged and outside the enclosure.
Ensure electrode wires are completely inside the enclosure.
Verify the enclosure door shuts securely.
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