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Partly because you can get those big red ones. Shiny. And they have built-in meters. But I don't want the 10 amp version, I want the 20 amp version. Because 20 is MORE than 10. And more is better.
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I would stay away from higher power no-name versions. I bought one of those 20A, red, shiny, no-name, made-in-China versions and it caught on fire at 15A with flames shooting out the vents. And the fuse didn't blow. A postmortem showed that there was no way the wiper assembly could handle 20A.
You can get used ones for a little more from recognizable names like Staco. A much safer and more reliable route, IMO.
Wise words indeed
ALL most of those blood colored varyzaps are half baked quality with suss wiring and assembly, flimsy, wonky carbon brush and dial coupling assemblies
If you do score one for a slab of loo paper money, open it and sort it out,
and de-rate it by at least 60% if under constant load > 10 amps scribbled on the wishful thinking label = 4 amps real world crossed fingers use
yes they are that crappy, seen a few, don't want to see any more
and have an analogue meter on it to see if any carbon brush skipping or arcing
occurs along the entire travel whilst under load and no load
Used units are definitely the way to go, built for WORK, but need to be checked and serviced, carbon brush assemblies and brush to coil tension/presure? in top shape,
and correctly wired, so no polarity stuff ups or wrong input tap etc
with careful use and in/out FUSING and or optional frugal current limiting on the output, a decent brand or refurbished old school unit won't disappoint
fwiw -if wired correctly- true isolation transformers (which won't work with RCD/GFCIs)
and interference suppression wired isolation transformers (which 100% should/better work with RCD/GFCIs)
have their place on the bench and hospital wards.
For starters they limit the entire street transformer dumping on your DUT and or you,
and isolate the bonded -LIVE Neutral- and Earth combo, embedded in the very ground that you are standing on,
as well as most exposed metal housed devices around you.
Yes, even with an IT you still run the same zappage risks, but not cop the full wrath of the street transformer that aims to please the consumer's
final freak demand
Differential probes are nice, but way overpriced for a TooHungLow made gadget, that's got the same or less parts cost, contruction, and R+D than most of the ever changing CAT litter rated cheap meters they dump on electronics punters
Differential probes are not truly isolated anyway afaict, just a fancy xxx probe, which if badly handled and the cable abused, good luck getting parts and schematics for that fried expensive DSO,
..6 weeks out of warranty