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Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters

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teddy529:
BenchVue iPhone/Android version is just a joke... |O

and on the memory size thing -> |O

Howardlong:

--- Quote from: Corporate666 on March 03, 2015, 05:33:17 pm ---
--- Quote from: Howardlong on March 03, 2015, 04:58:32 pm ---
--- Quote from: Sbampato12 on March 03, 2015, 04:50:32 pm ---
--- Quote from: Howardlong on March 03, 2015, 03:26:12 pm ---I'll test the water here.

What is the justification for blowing $3,000 on a 7.5 digit dmm?

I am desperately trying to keep an open mind, but it is my head that's saying besides a very, very, very few edge cases this has strong parallels to audiophoolery.

Please educate me!

--- End quote ---

If you could pay a lot more on a 8.5 digit dmm, why not on a 7.5 digits?
Some cases you need, and when you need, you need.

--- End quote ---

But what are those cases?  :-//

--- End quote ---

Well, testing voltage and current references for one.

Or what if you have an application where you're using a high quality ADC to measure something and you want to check your results in testing before releasing something to the field?  Or for calibrating a device using an ADC prior to shipment.  Or anytime that having a more accurate result is valuable... light sensing, temperature sensing, or whatever.

I don't think there is any parallel to audiophoolery, because an 8.5 digit DMM will actually have that level of resolution and accuracy, whereas audiophoolery is about expensive products that don't actually do anything at all.

--- End quote ---

What I was trying to understand though were the practical end uses. So, what practical end user device would that ADC be in for that you need that level of absolute accuracy, other than another DMM or voltmeter?

For audio or RF, for example, I wouldn't be using a DMM to measure the performance of an ADC.

Sorry, I am not trying to be difficult, I am just genuinely trying to understand what practical use cases there are for such a device other than "because you can", which is of course an option.

As far as I understand there are very limited real practical uses for such a device, but they will look nice on the bench.

In fact I was expecting the answer to be more along the lines of tracing trends rather than absolute measurement, but even then I would expect the applications to be rather limited.

georges80:
The Fluke 8845A that I have was originally purchased for its very low current measuring capability versus a typical hand held meter.

So, at least in my case the 6 1/2 digits wasn't nearly as important as the ability to measure nA accurately. i.e. bench meters of this caliber have other features that come 'for free' that may be more important in the purchase decision that the number of digits.

I doubt more than a tiny fraction of folk have a need for 6 1/2 or 7 1/2 or ... accuracy and indeed many of the purchasing decision are based on wanting the perceived latest & greatest versus needing it :)

cheers,
george.

Howardlong:

--- Quote from: georges80 on March 03, 2015, 10:34:50 pm ---
So, at least in my case the 6 1/2 digits wasn't nearly as important as the ability to measure nA accurately.

--- End quote ---

I can completely understand that, that makes a lot of sense.

EEVblog:

--- Quote from: georges80 on March 03, 2015, 10:34:50 pm ---I doubt more than a tiny fraction of folk have a need for 6 1/2 or 7 1/2 or ... accuracy and indeed many of the purchasing decision are based on wanting the perceived latest & greatest versus needing it
--- End quote ---

Trying watching something simple, like the slow discharge of a battery, using a 4.5 digit meter. Good luck.
Having a 6.5 digit meter is like having a deep memory scope. You don't know how useful it can be until you get it.

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