Bonjour a tous: It seems a lot of related topics in this thread:
Probe use in differential and single ended
Safety ratings
Probe design
Floating portable scopes
It is wise to do a bit of research in this area:
Probes: Tektronix Circuit Concepts Oscilloscope Probe Circuits
https://w140.com/tekwiki/images/6/62/062-1146-00.pdfSpecific models:
https://w140.com/tekwiki/wiki/ eg
https://w140.com/tekwiki/wiki/P5102The 30 VAC or 42.2 VDC rating of a scope or probe is a UL class of SELV = Safety Extra Low Voltage, in theory the max V for touching safety.
P5102 etc are designed to prevent contact and used in dangerous power applications.
The rating in the spec of 30V reflects the UL ratings and protects again liability in case of lawsuit.
I have used scopes and probes since 1960s including on high power and high voltage devices , to 55 kV.
I have seen scopes floated to 20 kV with appropriate precautions (LLNL)
Most TEK 10X probes have a 300-400 V peak rating.
HV probes P6013, P6015, P6015A have x100, X1000 and ratings to 20 kV, 40 kV peak.
I have never need a differential HV measurement, but used some diff active HV probes, such as Yokogawa 701921, 700V
Finally ALL of these "safety" probes have so much bulk, insulation and complication that usefulness is low.
Depending on your expérience and the danger of the devices being probed, you must judge if the risk is worth the benefit. Amateur Radio, Broadcast and power engineers know how to work and measure safely. Novices may not.
Kind Regards,
Jon
PS: LEGAL NOTICE I AM NOT GIVING ANY ADVISE, I HAVE NO LIBAIBLITY IF YOU ARE INJURED OR WORSE!