Owon SDS Series Service Manual page 7

Safety Requirement
Only qualified technical personnel are permitted to perform maintenance.
Prevent fires and personal injuries.
Use professional power wire. Only use the special power wire that is applied to the user
state.
Connect and cut off in the proper way. Please do not connect or cut off the probe or the
tested wires voluntarily when connecting with the power supply.
Grounding. Make sure the product is earthed properly by grounding conductor before
connecting with the input or output terminal that is to avoid electric shock.
Use the probe in a proper way. The grounding terminal of the probe is earth potential.
Pay attention to the nominal values of all terminals:
No operation is allowed without the instrument cover plate:
Use the standard fuse conformed to the product with the rating value.
No touch is allowed on bare conductors:
Operation is prohibited in case of any undetermined failure:
Keep ventilation in good condition: