krw used his keyboard to write :
35g2000pry.googlegroups.com>,
[email protected] says...>
Really? They both use resistive divider networks across the DUT.
I really don't understand the resistance (if you will excuse the
expression) to Arloe.
Of course both analog and digital meters (excluding, for practical
purposes, the original topic) have resistive input. For the purposes
Arloe uses a meter, the intentionally high impedance of most digital
meters is a liability. The lower impedance of an analog meter, and
some digital meters, is an advantage.
alt.home.repair gets more electric power questions than this
newsgroup, with the OP usually less technical savvy (some at a.e.e
that aren't either). It is rather common for someone to ask why there
is 83 volts on a wire that should be dead. The common response is it
is a "phantom voltage" picked up by using a high impedance digital
meter and to use an analog meter (or light bulb).
As Arloe said "An analog meter 'IS A LOAD' a DMM is NOT."
Arloe is just saying to use the appropriate tool.
In addition, he can't kludge a lower impedance onto a high impedance
meter. He may meter power circuits that have an available fault
current of tens of thousands of amps. In the US you may need to wear a
"flash suit" to merely meter the voltage. The meter must be designed
to safely fail on those circuits.
Same applies to responses to Stewart, who is speaking from
professional experience.
aioe.org, Goggle Groups, and Web TV users must request to be white
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Posted through googlegroups (yech) because my news source apparently
doesn't like cross posting.