Author Topic: Rigol 2072a Oscilloscope - 230V Mains - Switching Power Supply Probing  (Read 811 times)

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Offline Performa01

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Re: Rigol 2072a Oscilloscope - 230V Mains - Switching Power Supply Probing
« Reply #25 on: October 16, 2018, 08:23:05 am »
Where i live the mains voltage is over 230V's and at the fully rectified portion of the signal reaches about 400V's DC.

In the MicSig DP10013 differential probe specifications states that

Maximum Differential Test Voltage(DC+AC PK-PK):  130V(50X)

Maximum input common mode voltage(DC+AC PK-PK):  130V(50X)

Does this specification means that i only can use 500x atenuation rate for my device under test or may i use the 50X atenuation without problem? 

Thank you!

Yes I have the same mains voltage and a maximum voltage of about 400Vp should indeed be expected.

And yes, that means you can only use the higher attenuator setting.

This is exactly why I've recommended the TT-SI 9001. In the 100:1 setting, it can handle +/-700V which is plenty for what you need. On the other hand, you have still the 10:1 setting whenever you need differential measurements in some ordinary circuit, where you can safely probe up to +/-70V and have the same attenuation as with any regular 10:1 probe.
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Offline pantelei4

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Re: Rigol 2072a Oscilloscope - 230V Mains - Switching Power Supply Probing
« Reply #26 on: October 17, 2018, 05:16:45 pm »
I use Rigol 2072a + Micsig DP10013 for measurements in hot connections.  :-+
Oscillograms of 1 MHz meander, amplitude 5 V, band limitation 100 MHz
- DP10013 delay around 5ns (blue 10X, yellow 50X)
- noise 50X
- noise 500X
« Last Edit: October 17, 2018, 05:19:36 pm by pantelei4 »

Offline David Hess

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300 volts RMS is 425 volts peak so there should be no problem.  Rigol's lack of frequency derating makes this specification fuzzy so I would not trust it; it could be better or worse so take your chances.

Note that a typical x100 probe will *not* protect the oscilloscope from excessive DC voltage when AC coupling is used.  These probes need to be used with DC coupling at high voltages.

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