High Voltage Protection (480VAC)

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opeleg

High Voltage Protection (480VAC)

Post by opeleg » Wed May 04, 2011 8:31 am

Hello, I have a 4424 scope. I have a few questions regarding 3 phase mains voltage measurement.

1) I understand that to measure 3 phases I will need 3 high voltage differential probes like the TA041. Can I measure a single phase (480V) with a passive 10x or 100x probe?

2) Should I have any concerns about my laptop when measuring high voltage? What kind of protection is there through the usb port? Is it isolated?

Thanks,
Omer

ziko
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Re: High Voltage Protection (480VAC)

Post by ziko » Wed May 04, 2011 5:02 pm

Hi whether it is single phase or three phase, you will still need to use somethign like the TA041.

Kind regards
Ziko

Technical Specialist

opeleg

Re: High Voltage Protection (480VAC)

Post by opeleg » Fri May 06, 2011 5:37 pm

Why is that? If I have attenuation on the probe, the voltage that scope sees should be either 48V (10x) or 4.8V (100X). Is this not correct?

Thanks,
Omer

ziko
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Re: High Voltage Protection (480VAC)

Post by ziko » Tue May 10, 2011 10:43 am

Hi if you are measuring mains voltage then you need isolated probes that are designed for this voltage. This is a safety requirment really. The probe needs to be CATII or CATIII rated for use in this environment.

Kind regards
Ziko

Technical Specialist

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