5
If you are not using a Faraday cage, it might be necessary to shield the complete setup with aluminum
foil or similar to prevent electrical interference from the outside. Connect the aluminum foil to the
ground of the setup (for example, the metal table).
Troubleshooting: If you observe problems with noise, check that the ground of the setup is connected
to exactly the same ground as the data acquisition computer. For example, connect the metal table
to the ground/earth wire of a free power outlet (of the same electrical system), as the computer is
generally connected to ground/earth via the power plug, too. Also, connect the data acquisition
computer’s metal case with a thick ground wire to the ground of the setup, for example, the
metal table, preferably with a 4 mm plug.
4 Service and Maintenance
Cleaning the Connectors
Warning: It is recommended to avoid the use of cleaning solutions to avoid corrosion. If a wet
cleaning is required, use distilled water. Make sure that only the connectors touch the liquid; do not
submerge the miniature preamplifier or the cable. Otherwise, you can fatally damage the electronics.
Clean the connectors with 70 % alcohol and cotton swabs from time to time.
If this does not provide satisfying results, insert only the connectors into a small beaker with acetone or
alcohol and treat them in an ultrasonic bath for 10 to 20 s. Air-dry the miniature preamplifier for about
5 min before use.
You can also clean the connectors with distilled water in an ultrasonic bath. Dry the connectors with
compressed air immediately after sonication and let the amplifier air dry for at least 6 h before use.
Sterilization
Warning: Do not autoclave or sterilize miniature preamplifiers by high heat (above 70 °C) or vapor.
The resin is not heat-stable and may deform under heat. Vapor can lead to a corrosion of the
electronics.
Miniature preamplifiers can be sterilized with standard methods that are not based on high heat or
vapor, for example, with 70 % ethanol, UV-light, or by thermal sterilization in an oven at 56 °C with
an incubation time of 8 hours.
(22 pages)
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