Completely neglecting any powerline considerations, most scopes
have a maximum vertical input voltage rating, typically a bit more
than the peak to peak input at the maximum volts/division.? This
does not consider the probe.
I'd feel reasonably happy measuring low frequency waveforms with
an X10 probe, 5 volts (50 volts/div scaled) at about 200 volts
plus.
Probes have a maximum voltage limit.
Scope inputs have a maximum voltage limit.
All of those go down as the frequency goes up.
That's on a 1 meg input impedance.
For a 50 ohm impedance, don't even think it.
Then again, I have a high voltage scope probe, too.
Harvey
On 11/18/2021 10:06 PM, Bostonman
wrote:
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This is all useful information about safety. I don't want to
deviate too much, but does seem the original question is somewhat
answered.
Ignoring the safety aspect of measuring 120V, is it safe for the
scope to be measuring 120V or should some soft of device be used
to reduce the voltage?
I have measured 10s of thousands of voltage using a high voltage
probe, but that was with a DMM.
As I stated, I need to do more research on the safety aspect. I've
never heard of anyone blowing up a scope or a probe, however, I
remember blowing a fuse at an old job.
