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nctnico:

--- Quote from: wizard69 on February 28, 2021, 04:21:27 pm ---
--- Quote from: Fungus on February 28, 2021, 03:12:32 pm ---
--- Quote from: nctnico on February 28, 2021, 03:04:00 pm ---Yes. If a scope is deep enough I like to stack equipment on top.

--- End quote ---

If only somebody could invent "adjustable shelving".

--- End quote ---

Better patent that idea quick.

As for stacking I never really liked it because the minute you need to pull an instrument or just move it around you run into a lot of frustration.   A shelf per layer might not work in every case but it is simple to implement.   I can imagine though people not wanting to spend $100 on shelving to place their $20 000 of equipment on.

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Shelving isn't ideal either due to varying equipment height and depth. I usually build stacks of equipment dedicated for a project (partly due to not having room for shelves). And sometimes re-shuffling the stack of equipment is necessary.
tautech:
TiN knows how to build a decent bench:
https://www.eevblog.com/forum/projects/custom-bench-for-electronics-lab-using-t-slot-extrusion-frame/
Kleinstein:

--- Quote from: wizard69 on February 28, 2021, 04:10:55 pm ---Actually I do want better CAT ratings on bench meters.   I may be 60 but I still remember the stupid things students do in tech classes.   The idea that they are marketing this as a solution for education is what prompted my post.

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Students do a lot a crazy things. It is even easier in Europe then in the US: the standard 4 mm plugs nicely fit many European power outlets.
So it is a good thing they introduced the fixed shrouded plugs, especially for educational use.

It makes some sense to have at least some 300 V CAT II rating, but not much more really needed.
A much higher rating can get quite expensive as it may require special relays instead of the more normal ones.

A not so high CAT rating also allows for cheaper fuses, which may be an issue for use with students.


The new DMM format may not replace the old 34450 - just an alternative in a different form factor. So one has the choice, depending on the space available and use. Not so sure the 34450 is that popular with automated setups, as it is not that much cheaper than a 34460 or similar.
floobydust:
Bench multimeters have low (common-mode) isolation voltage to their mains power, due to the power transformer.
It looks like the EDU34450A has a linear PSU for lower noise floor, there's a mains power transformer in there. The MCU noise in the 34461A is quite noticeable though.

If I was designing mains SMPS using these multimeters, they would have a short life. They autorange down to mV and get hit with say 370VDC and click clank clunk relays with auto-ranging. So the input stage gets multiple overloads every time. This is differential-mode I am referring to. Then the mux/JFET's get killed and it's a $500 repair bill for the $725 product.
Berni:
I don't think a really high CAT rating is all that important for such an educational bench DMM.

It has to not explode being plugged into the 230V mains outlet and that is it. If any high voltages are used in the experiment the stuff is generally covered under some plastic, shrouded banana jacks used etc... because they know some of the students are stupid and will not pay attention to what they are doing. If high voltages at such high currents are used to require the proper high CAT rating meters then they REALLY should not leave students to mess with it unattended. But a mains outlet, any decent name brand DMM will take that without exploding and harming the user.

The overall robustness of the meter is more important id say. It must survive having 230V shoved into it for any combination of input connections and measurement modes. Sure it might blow a fuse on mA or A but once replaced it should continue to work fine.
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