Products > Test Equipment
Fluke 8840A/AF "VDC Ratio"
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J-R:
I noticed some Fluke "8840A/AF" models have a ratio function label by the front/rear switch and the rear terminals, but I couldn't find any further information on this feature.  Has anyone seen any documents referencing this or used it?
AVGresponding:
I've never seen this, do you have a pic?
J-R:
Hmm, I have to give you high-post-count users some grief for not doing a simple image search!

However, I've attached some images shamelessly ripped from the internet just so we don't have to deal with any dead links later...
HKJ:
I do not know the meter, but a guess could be:

There is no switch for ratio and rear input do cannot measure current. Maybe the current switch will select ratio mode when rear input and current is selected?

It is a guess and I would have expected some sort of marking at the current switches (except there is no space for it).
AVGresponding:

--- Quote from: J-R on January 14, 2023, 09:21:57 am ---Hmm, I have to give you high-post-count users some grief for not doing a simple image search!

However, I've attached some images shamelessly ripped from the internet just so we don't have to deal with any dead links later...

--- End quote ---

I did, but I misunderstood what you wrote; I was looking for a separate button.

It's a DC/DC voltage ratio measurement function... It'll give you a ratiometric reading between a reference voltage (0-20VDC) and an unknown voltage (0-1000VDC). Maybe normal VDC readings are possible at the rear using only the "input"... inputs, and leaving the "reference" inputs floating.
Manuals specific to the A/AF seem difficult to find.
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