Products > Test Equipment
Fluke 79 179,... wrong readings
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tggzzz:

--- Quote from: chinoy on November 04, 2023, 05:29:20 am ---Im having the exact same problem with a Fluke 223
In fact I made a similar post about this just a few days back.
I cant even get two Flukes to agree with each other.  Facing this problem with both a/c and d/c.

--- End quote ---

If you mean this thread
https://www.eevblog.com/forum/chat/how-do-you-calibrate-your-gear/msg5148885/#msg5148885
then many people have asked you for important information, and you have not given it.

Without the information people have requested, we cannot determine whether the meters are faulty, your test techniques are faulty, your understanding is faulty - or whether there is no problem at all.

Over to you...
temperance:

--- Quote ---Im having the exact same problem with a Fluke 223
In fact I made a similar post about this just a few days back.
I cant even get two Flukes to agree with each other.  Facing this problem with both a/c and d/c.
--- End quote ---

For AC the Fluke might be wrong because the tape head is a floating 300...600 Ohm source.
bdunham7:

--- Quote from: temperance on November 04, 2023, 02:37:00 pm ---For AC the Fluke might be wrong because the tape head is a floating 300...600 Ohm source.

--- End quote ---

I can't find a Fluke 223 model anywhere, no idea what it is.  Perhaps an Asian-only model that has managed to hide from the internet entirely?

In any case, for a 179 the input is 10M/<100pF.  That would present a load (Z) of at most 1.5M to a 1kHz signal, leading to an error of less than 0.05%.  The specified accuracy of a 179 at 1kHz is 2%. 
bdunham7:

--- Quote from: chinoy on November 04, 2023, 05:29:20 am ---Im having the exact same problem with a Fluke 223

--- End quote ---

Can you post a photo of this meter or a good link to a page for it?
BeBuLamar:

--- Quote from: bdunham7 on November 04, 2023, 03:46:43 pm ---
--- Quote from: temperance on November 04, 2023, 02:37:00 pm ---For AC the Fluke might be wrong because the tape head is a floating 300...600 Ohm source.

--- End quote ---

I can't find a Fluke 223 model anywhere, no idea what it is.  Perhaps an Asian-only model that has managed to hide from the internet entirely?

In any case, for a 179 the input is 10M/<100pF.  That would present a load (Z) of at most 1.5M to a 1kHz signal, leading to an error of less than 0.05%.  The specified accuracy of a 179 at 1kHz is 2%.

--- End quote ---

I think he might mean the 233 with remote display
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