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| Clarification about floating measurement with an insulated oscilloscope |
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| giacomo:
In another topic about the tektronix ths series of handheld oscilloscope an user of the forum has underlined that from the manual the maximun allowed floating voltage without insulated probe would be 30Vrms, that sound low, so i wondered if the reasons are more regard humans safety or if we must also pay consideration for the scope safety or for not screw our measurments. I thought that the question was also applicable to insulated oscilloscopes in general. |
| madires:
Most likely to encourage you to use insulated probes when dealing with lethal voltages. 30Vrms won't hurt you, but 300Vrms will. |
| capt bullshot:
The 30Vrms spec. matters only for your personal safety. If it's ok for you (and your gut feeling of safety), you can use an unsinsulated probe for the max. rating of the scope common mode voltage. Just keep in mind, it's dangerous for you, not the scope. |
| bdunham7:
There are regulations that prohibit exposed conductive parts from having more than 30Vrms or 42Vpk to ground. An uninsulated probe connector will be at the same potential as the ground lead, thus the specification on the scope. The scope doesn't care whether the probe is insulated or not, but you should. |
| lor3n7o:
Hello everybody. The curious thing is that this THS700 oscilloscope comes with P6117 probes (of which I am attaching the datasheet). However, the P6117 has a fully insulated bnc connector covered in plastic material. But according to the manual, even with this probe it is possible to carry out floating measurements for only 30V. I have never noticed this limitation on floating voltage with standard probes, so I have sometimes made the measurements between high and low voltage with p6117 probes and nothing has happened, but now I have doubts. At this point I am very curious to know what is particularly about the hi voltage floating tek P5102 probe. |
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