16 Apr
2011
16 Apr
'11
3:44 p.m.
On 4/15/11 9:18 PM, Brent Hilpert wrote:
We all agree there are always comparisons to some
reference or other,
but the point I was attempting to make of the distinction between
approaches remains. The calculable capacitor situation relies on another
definition of C to calculably take the measurement back to that of the
more fundamental measurement of distance, as opposed to simply
calibrating it as another C (more turtles).
Ahh ok, I understand what you mean now.
I once had an argument with a fellow who didn't believe
potentiometric voltage measurement systems ever had any value, because
there have been "multimeters", VOMs and VTVMs for many decades. "Why do
all that comparison stuff with standard cells when you can just MEASURE
the damn thing?" he asked. He didn't understand that there's a voltage
reference of one sort or another inside every VOM and VTVM.
Just what does constitute an LSB interval in that DVM's ADC, anyway?
-Dave
--
Dave McGuire
Port Charlotte, FL