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Siglent SDS5034X scope: Voltgaes allowed to apply to it?
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Faringdon:
Hi,
We want to use a bit of coaxial cable as a DIY probe to scope a leakage inductance spike which goes up to ~250Vpk.
Can we put the coax into this scope directly (with a BNC connector on it)?

AYK, the coax piece doesnt have the 10MEG resistor in it, its just a piece of plain coax
People usually say +/-300V to a scope...but this is with the 10MEG probe resistor in there?

Manual and service manual doesnt say
https://siglentna.com/product/sds5034x-350-mhz-4-ch/
tautech:

--- Quote from: Faringdon on January 07, 2023, 08:01:30 am ---Hi,
We want to use a bit of coaxial cable as a DIY probe to scope a leakage inductance spike which goes up to ~250Vpk.
Can we put the coax into this scope directly (with a BNC connector on it)?

AYK, the coax piece doesnt have the 10MEG resistor in it, its just a piece of plain coax
People usually say +/-300V to a scope...but this is with the 10MEG probe resistor in there?

Manual and service manual doesnt say
https://siglentna.com/product/sds5034x-350-mhz-4-ch/

--- End quote ---
P9 of the datasheet does under Max. Input voltage
https://int.siglent.com/u_file/document/SDS5000X_Datasheet_EN02B.pdf
Performa01:
The specifications clearly state  max. input voltage @ 1 MΩ ≤ 400 Vpk(DC + AC), (DC~10 kHz).

So the real question is about the frequency spectrum of that signal. If the rise time of that spike is not faster than 35 µs, you should be totally safe. But even if it is faster, it is unlikely that the input circuitry will suffer damage from a moderate overload lasting only a few microseconds.

The 10 kHz apply to a continuous sine wave and not a spike with low repetition rate.

It all comes down to the total energy pumped into the scope input. This in turn quite obviously depends also on the physical size of the inductor...
2N3055:
Scope is grounded instrument.
What are you measuring and how?
Please explain exactly.

If you never measured it, how do you know what spike voltage is?

Safe way of measuring high voltage/ high energy is having safety reserve..

If DUT is floating and can be safely connected to scope then you could use normal passive 100x probe rated for 1000-1500V. There are dozens of them to buy, some very inexpensive.
If DUT is part of something grounded, then you need high voltage differential probe.

SDS5000X is not cheap scope. Damaging it because you try to save money on probing is not cheaper long term...




Faringdon:

--- Quote ---P9 of the datasheet does under Max. Input voltage
https://int.siglent.com/u_file/document/SDS5000X_Datasheet_EN02B.pdf
--- End quote ---
Thanks, this scope must not be menat for use with SMPS, as only giving the voltage rating for up to 10khz, is totally no good for SMPS work....just thinking of eg flyback drain voltages etc etc etc....
Also, i assume they mean its 400vpk when you use a 1:1 probe?

Presumably if you  use a 10:1 probe then its 4000Vpk?

I just connected this scope via a 10:1 probe to a node which was pulsing up to 200V for some 100ns every 3.3us.....i hope ive not damaged it?
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