Author Topic: DC coupling on the AC mV input of some Fluke multimeters  (Read 2359 times)

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Offline Balaur

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DC coupling on the AC mV input of some Fluke multimeters
« on: November 06, 2010, 01:52:13 am »
Hello,

I was wondering why the AC mV setting for some Fluke multimeters (ex: 114-117) is DC-coupled?

Are there any practical reasons for that?

I have to use a capacitor and maybe some hundreds K resistor in parallel to the multimeter input in order to be able to use that setting when measuring ac signals on biased transistors or ripple levels.

Is there something I'm totally oblivious to?

Thank you,
Dan
 

Offline NiHaoMike

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Re: DC coupling on the AC mV input of some Fluke multimeters
« Reply #1 on: November 06, 2010, 02:23:24 am »
Probably so they can eliminate the relay needed to switch between AC and DC coupling at the input. The selection can then be done with a low voltage electronic switch after the input amplifier.
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