[geeks] Tektronix TDS 220

[geeks at sunhelp.org]

~ But, like vue meters on audio equipment, some people just 
~ like the feel
~ and look of a nice Simpson meter.  For "that's about right" 
~ measurements
~ I prefer the quick readability of a needle, even over a good 
~ bar graph. 

Some measurements are impossible on a DMM, such as a voltage that is
wandering (unsteady). Sometimes the lag of a needle swing helps smooth out a
quickly wobbling voltage too.

~ Of course most DMMs have very high input impedance, so if precision
~ matters a DMM will affect thge circuit under test less, and 

4 words. Vacuum Tube Volt Meter. Indispensable for high impedance needs, and
often higher impedance than "affordable" DMM's.

~ there is no
~ possible way to get 3 digits of precision with even a good mirrored
~ meter.

There are some sneaky ways to do this (shunts/bridges/whatnots). The idea is
to keep most of the voltage out of the meter and use a very sensitive scale.
Its been way too long, so I forget the specifics, but it can be done.