ADInstruments PowerLab 2/20 Owner's Manual page 6

Figure S–1
Equipment safety symbols on
ADInstruments devices
designed for safe connection
to humans
vi
General Safety Instructions
• Since the PowerLab is used in conjunction with a computer
(which has much higher leakage currents) the subject must be at
least 1.83 metres (6 feet) away from any of the equipment, to
avoid contact with the computer. The Bio Amp or BP Amp cable
provides enough distance. Alternatively, an isolation transformer
can be used to supply power to both the PowerLab and the
computer.
• The PowerLab 2/20 and PowerLab 4/20 are classified as Class I
medical equipment, which means that protection against electric
shock in the event of a fault relies on a direct connection through
the power cable to your building's earth conductor. The power
cable supplied with your PowerLab provides the required ground
connection to the power outlet. If your building does not have
power outlet sockets with a good ground connection, then you
may use the ground connection on the rear of the PowerLab to
provide the equipotential connection to the building's earth
conductor. A ground connection is an essential part of this
equipment's safety. Never use the PowerLab without a ground
connection.
Safety Symbol Explanation
Every ADInstruments device designed for connection to humans,
including the Bio Amp, BP Amp, GSR Amp and Stimulus Isolator,
carries one or more of three safety symbols, as shown in Figure S–1.
These symbols appear next to those input and output connectors that
can be directly connected to human subjects.
BF symbol: Body-
protected equipment
!
Warning symbol: see
documentation
CF symbol: Cardiac-
protected equipment
PowerLab Owner's Guide