Author Topic: Question about fluke 87 v multimeter voltage reading  (Read 565 times)

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Offline Turttle2013Topic starter

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Question about fluke 87 v multimeter voltage reading
« on: October 16, 2020, 07:05:02 am »
I was asked to measure the max DC input of a charging system, the DC input should be roughly 400v and no more then 800v. When I first measured the dc input it was 1265v. I tested 3 more times and the highest I recorded was 1663v. The manufacture said there was no way it could be that high. So I bought a Fluke 87v and a 1000:1 HV probe, and measured the site again. This time the manufacture flew their tech out to measure as well.

With the 1000:1 HV probe connected to the Fluke and the settings on Auto hold and the voltage range set to 6.000v
the results I got were 0.1114v. As I understand it that with using the 1000:1 HV probe that would equate to 1114v or would I be incorrect?


Thank you for your help with this

1090512-01090516-1 [ Specified attachment is not available ]
« Last Edit: October 16, 2020, 12:01:24 pm by Turttle2013 »
 

Offline MosherIV

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Re: Question about fluke 87 v multimeter voltage reading
« Reply #1 on: October 16, 2020, 07:59:26 am »
I think 0.104V on the dmm means 104V.
The probe is 1000:1 meaning divid by 1000. You need to multiply by 1000 which means move decimal point to right by 3.

BTW the Fluke87V should easily be able to take 1000V and a bit more. The input protection will stop damage from happening.
 

Offline tooki

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Re: Question about fluke 87 v multimeter voltage reading
« Reply #2 on: October 16, 2020, 08:55:49 am »
So i was wanting to test max out of dc it should max at around 800v when i set up the meeter i had it at 6.000v i stead of 1000v and had a hv probe connected 1000:1 so that if the spike was higher then 1000 v dc it wouldnt ruin my meter quetion i am getting reading of say 0.1040 would that actually ne 1040v dc seeing how i set the meter to 6.00v

 The manual shows thisand i am new to the meter. And thi as many setting optionsq
(Attachment Link)
Please use punctuation and fix your typos, so we can easily figure out what you mean instead of trying to decipher a huge run-on sentence paragraph.
 

Offline eblc1388

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Re: Question about fluke 87 v multimeter voltage reading
« Reply #3 on: October 16, 2020, 08:59:41 am »
A DVM would integrate the input voltage for a certain period in order to get a reading. I'm not too sure using a DVM to measure a spike would give meaningful readings as spike is usually of very short duration. The proper instrument to use is an oscilloscope.
 
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