Author Topic: AC Voltage Component of DC with Analogue & DMM  (Read 1693 times)

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Offline zenoid

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AC Voltage Component of DC with Analogue & DMM
« on: February 21, 2014, 07:11:41 pm »
hi all - i use an Avo 8 mk6 meter for my model railway hobby & other. - i don't have a DMM.

a few days ago my led tv packed in.
i thought it was the psu caps however they looked ok so i decided to check the single 12vdc output. that too was ok but when i switched the avo to ac a reading of about 25vac was displayed.

i was rather confused by this & posted on another forum regarding. there i was informed that the  ac component of a dc source could not be measured correctly using an analogue meter.

however regarding a DMM, conflicting advice was given  - some said the ac component could be tested others, not.

i would therefore be grateful if someone could enlighten me before i buy one.
 

Offline HKJ

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Re: AC Voltage Component of DC with Analogue & DMM
« Reply #1 on: February 21, 2014, 07:43:45 pm »
This depends on the meter, some meters has a capacitor blocking DC when measuring AC.
If a meter has both AC and AC+DC setting, then the AC settings has a capacitor blocking the DC.
 

Offline zenoid

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Re: AC Voltage Component of DC with Analogue & DMM
« Reply #2 on: February 21, 2014, 08:03:19 pm »
This depends on the meter, some meters has a capacitor blocking DC when measuring AC.
If a meter has both AC and AC+DC setting, then the AC settings has a capacitor blocking the DC.
hi HKJ - many thanks for that -  by any chance you wouldn't have a make/model that would have that function?


 

Offline HKJ

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Re: AC Voltage Component of DC with Analogue & DMM
« Reply #3 on: February 21, 2014, 08:12:14 pm »
hi HKJ - many thanks for that -  by any chance you wouldn't have a make/model that would have that function?

Yes: Fluke 189, Fluke 289, Agilent U1272A, Gossen MetraHit energy

That is because they are high end DMM's, you can also find many cheaper DMM's with that function.
 

Offline zenoid

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Re: AC Voltage Component of DC with Analogue & DMM
« Reply #4 on: February 21, 2014, 10:57:52 pm »
Yes: Fluke 189, Fluke 289, Agilent U1272A, Gossen MetraHit energy

That is because they are high end DMM's, you can also find many cheaper DMM's with that function.

thanks again.
 


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