For a Simpson 260
For a Simpson 260
(OP)
why would anyone put a 500v 2A fuse in series with a 250v 1A fuse in series with the common lead?
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RE: For a Simpson 260
It does not give you any problems with high potential on the GND because it is a closed instrument and GND is not possible to touch.
Also, this is 1950 technology and no one cared back then. The more problematic fact is that the test leads are non standard and that it is not possible to connect safety-enhanced test leads. But, who cares? You can have instruments superior to the 260 for something like 20 bucks. And real safe and high-quality instruments for around 100 dollars.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: For a Simpson 260
When was the last time any of us had to use the Ohms per Volt rating to determine the circuit loading that the test instrument would present?
Was the Simpson one of those with quite a low Ohms per Volt or am I confusing it with another old "quality" name?
And for a really low Ohms per Volt, does any one remember the Wigginton (Wiggy) voltage tester. The older the lower!
Bill
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"Why not the best?"
Jimmy Carter
RE: For a Simpson 260
My Simp has 20 000 opv at DC and 1 000 opv for AC.
The latter was very good because you loaded AC circuits a bit and wasn't fooled by ghost voltages.
My old Siemens Multizet draws 60 mA on the 6 V AC scale. That's 100 opv. Can it get any lower?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: For a Simpson 260
They were crude but rugged and dependable. I imagine they saved many lives over the generations that they were in common use.
Bill
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"Why not the best?"
Jimmy Carter
RE: For a Simpson 260
RE: For a Simpson 260
Roy
RE: For a Simpson 260
It turns out the 2A was protecting the equipment and the 1A was protecting
the (presumably more costly) 2A from nuisance tripping.
RE: For a Simpson 260
Another big advantage over multi-meters was couldn't check voltage with the meter inadvertently on Ohms or milli-amps. I never had a multi-meter blow up in my hands but I have heard descriptions of large power breakers (1400 amps) being tripped by a multi-meter. Sure glad it wasn't me holding the meter.
As you mentioned, some multi-meters use a capacitor in the AC circuit to block DC.
Bill
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"Why not the best?"
Jimmy Carter
RE: For a Simpson 260
I guess we didn't quite understand the question. Your answer seems to make a lot of sense.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: For a Simpson 260
Bill
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"Why not the best?"
Jimmy Carter