Owon VDS Series Quick Manual page 5

To avoid body damage and prevent product and connected equipment damage,
carefully read the following safety information before using the test tool. This
product can only be used in the specified applications.
Warning:
To avoid fire or electrical shock, please use proper power adapter. Use only the power
adapter appointed by the manufacturer and subject to approval of being used in the
user's country.
Warning:
The two channels of the oscilloscope are non-isolated electrically. The channels should
adopt common basis during measuring. To prevent short circuits, the 2 probe ground
must not be connected to 2 different non-isolated DC level.
Warning:
The channels should adopt common basis during measuring. To prevent short circuits,
the 2 probe ground must not be connected to 2 different non-isolated DC level.
The diagram of the oscilloscope ground wire connection:
Signal Input
Ground Clip
The diagram of the ground wire connection when the oscilloscope powered by PC USB
is connected to the AC-powered PC through the USB ports:
Probe
Signal Input
Ground Clip
It is not allowed to measure AC power when the oscilloscope is AC powered through
the adapter, or when the oscilloscope powered by PC USB is connected to the
AC-powered PC through the ports.
Warning:
To avoid fire or electrical shock if a test tool input is connected to more 42V peak
(30Vrms) or on circuits of more than 4800VA:
Use only insulated probes and adapter supplied with the test tool, or indicated by
OWON as suitable for the Oscilloscope.
Before use, inspect probes and accessories for mechanical damage and replace
when damaged.
Remove all probes and accessories that are not in use.
Oscilloscope
Probe
Oscilloscope
(PC USB power)
3
AC Adapter Electrical Outlet
PC
USB Cable
Electrical Outlet