Joel said:
Unless your older analog meters had a FET input, the impedance wouldn't have
been anywhere near that high -- more in the ballpark of 1k-100k, actually!
That Fluke Multimeter probably is about 10M, although it's likely to be spec'd
as something like 10M in parallel with, say, 20pF, so by the time you hit
10kHz you'd be down to under 1M.
---Joel
10/11 Megohm analog meters were built with a dual triode or a pair of
FETs to reduce loading the circuit you were working on. AKA VTVM or
FET-VOM
They had 10 Megohm input impedance on AC, plus a 1 Megohm resistor in
the DC probe to reduce the capacitance of the meter lead to keep it from
interfering with the D.U.T.
I can post a schematic to A.B.S.E if you are not familiar with this
type of meter.
--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.
Michael A. Terrell
Central Florida