Owon HDS272S User Manual page 8

powered computer through the port, it is not allowed to measure the primary
power supply of power grid.
Warning:
If the input port of the oscilloscope is connected to a voltage with a peak value
higher than 42V (30vrms) or a circuit with a peak value of more than 4800 VA,
the following measures shall be taken to avoid electric shock or fire:
⚫ Only voltage probes, test wires and adapters with proper insulation
attached to the oscilloscope or accessories suitable for oscilloscope
instrument series products specified by our company shall be used.
⚫ Before use, check the multimeter test probe, oscilloscope probe and
accessories for mechanical damage. If damage available, replace it.
⚫ Remove all unused multimeter test probes, oscilloscope probes and
accessories (power adapter, USB, etc.).
⚫ Firstly, plug the power adapter into the AC socket, and then connect it to
the oscilloscope.
⚫ When testing in a CAT II environment, do not connect a voltage higher
than 400 V to any input port.
⚫ When testing in a CAT II environment, do not connect a voltage with a
voltage difference of more than 400 V to the isolated input port.
⚫ Do not use an input voltage higher than the rated value of the instrument.
Pay special attention when using 1:1 test wires, because the probe voltage
will be directly transmitted to the oscilloscope.
⚫ Do not touch the bare metal BNC or banana plug.
⚫ Do not insert metal objects into the connector.
⚫ Use the oscilloscope only in the specified way.
⚫ The voltage rating mentioned in the "warning" information is the limited
value of "working voltage". They represent V ac rms (50-60 Hz) in AC sine
wave applications; and V dc in DC applications. CAT is the prefix, and II
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