David Nebenzahl wrote:
On 3/29/2009 2:41 PM Jon Danniken spake thus:

"svu geek" wrote:

I need to buy a multimeter. I noticed that for the resistance some
have 2000k and some have 20M, which I believe are totally different.
Which one is better to have? Or does it even matter? I'm mostly
interested in testing something that's around 2M. So I don't know if
it matters which multimeter I get.

For resistance measurements, more is better. A short circuit is
ideally zero ohms, and it goes up from there.

Practically speaking, you might never need to measure more than 2
MegOhms, which is a high enough value for most uses.

You're confusing the *resistance* range of a meter to its *impedance*.
Both are measured in ohms. The impedance has nothing to do with how high
a resistance the meter will measure.


Hi,
On digital meters input impedance is pretty high already. High Z gives
more accuracy by not loading circuit under measurement but some times it
is not useful for it's high sensitivity. That is why I still have old
tank Simpson 260, Fluke, and even an old VTVM when dealing wth high
frequency circuit. On top of that o'scope if I need to see something
when numbers don't help. Some times also simple test light is enough.