Author Topic: Agilent Multimeter U1252B Blown up  (Read 631 times)

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Offline kevinsagen47Topic starter

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Agilent Multimeter U1252B Blown up
« on: October 06, 2023, 02:38:27 am »
Two of my company's U1252B have burnt mark traces in their PCB. |O I don't recall doing anything weird.
I was measuring the voltage and frequency of 1000Vrms signals.
Peak-to-peak voltage is max 3000V (which is higher than the written 1000V max), shouldn't it give me a warning or something?
I used the same rated CAT III 1000V Fluke 289 and 87V, and they are both perfectly fine.
I even used the BM235, which is only rated for CATII 1000V, no problem!
What should I do with them? Use them as paperweights? :-DD
« Last Edit: October 06, 2023, 02:40:50 am by kevinsagen47 »
 

Offline bdunham7

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Re: Agilent Multimeter U1252B Blown up
« Reply #1 on: October 06, 2023, 02:59:19 am »
I'd say they're toast.  This 3000Vp-p AC voltage, is it symmetrical or is there a DC component?  IOW, what is Vpk or the absolute peak voltage at any time?

I'm glad your other meters didn't blow up, but when I'm looking at high voltages like this where I don't actually know what the signal might look like, I prefer to use a HV divider probe like the Fluke 80K-6.
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 


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