Hi Scott:
Many dual channel scopes (whether digital or analog) include an “add” function
for the two channels. One channel must be inverted to measure the charged
capacitance.
The resistance of the two probes must be accounted for in the capacitance
discharge time. (The same – for only one probe -- is true for the scheme using
an isolating transformer.)
You should get the same results for both methods.
Best regards,
Rich
IEEE Life Fellow
IEEE Medal for Environmental and Safety Technologies
From: Scott Xe <scott...@gmail.com>
Sent: Monday, October 17, 2022 8:18 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Assess risk of electric shock from charged capacitors
In order to judge if there is no risk of electric shock from charged
capacitors, it is required to measure the voltage across L and N of mains plug
after the removal of power input. To avoid grounding loop between test
equipment and the unit under test, an isolating transformer is strongly
recommended. I have learnt another way by using Add Function and two hot
probes of a dual channel DSO. Can someone advise which way is more common in
safety conformity test. Especially the latter one, I have not tried it yet
before and appreciate any notes I must take in the measurement.
Thanks and regards,
Scott
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