> > The =805 models have 1M Ohm rather than 10M Ohm on voltage. Go "BANG"
> > in a blue flash with 500V DC on the 750V range

> That doesn't make sense. =A0500V into 1Mohm is only 250mW. =A0If it went =
bang
> with a blue flash there was something else going on, probably bad insulat=
ion
> or dirt in the wrong place. =A0This wouldn't be the fault of 1Mohm versus
> 10Mohm input impedence.

I believe the point being made is that the two aspects are both
indicative of the lower quality of such units.

Low cost multi-meter sold here, where we have 230 VAC mains, often
have an added instruction sheet that says that they are not suitable
for connection to AC mains, despite usually having a top ACV range
labelled 750 VAC or 1000 VAC on the dial.

But fwiw, it would not be at all surprising if bottom end meter makers
not only did not use resistors (or strings thereof)_ that were rated
for the voltage liable to be applied, but also used nominal 1/8 Watt
parts in locations where dissipations of double that may occur.
In "certain countries" the utter refusal in many or perhaps even most
cases, to do "the right thing" when it's not the cheapest thing, even
when the consequences are well enough known, needs to be experienced
to be believed.

Two days ago I was approached by a prior contact seeking design
assistance (lighting related). Even when I offered a full competent
design for free that would not cook the batteries and would not
unnecessarily shorten the LEDs lifetime, and which would cost little
or no more  than the design they were proposing to use she declined to
even discuss it. The person is a friend who I like personally and get
on with well, but the rationale behind the mindset that accepts such a
 degree of refusal to do things right, so far escapes me.
Multimeters, or LED lights, that are the product of such approaches,
are "best avoided" :-).


        RM

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.