Jim Wilkins wrote:
On Feb 16, 4:52 pm, wrote:
Jim Wilkins wrote:
...
Note how Hawkins and Barling used a one-step process
for each frequency of interest with their very low impedance
measuring circuit.

http://www.telepower.com.au/INT95b.PDF
By forcing a small, levelled, alternating broadband current
through the battery, they measured the resulting voltage
between 5 milli-Hz to 100 Hz in order to arrive at an
impedance reading, calculated by an attached PC.
They went on to measure impedance above 10 Hz (to 100 KHz)
using current-levelled sinewave excitation.
..
--Winston-

Did it seem to you that they might have been measuring the response of
their test setup in addition to the batteries?

No doubt they did.

One can only hope that they minimised noise of various kinds,
virtually eliminated coloration of the data by their test
set and did a few sanity checks before publishing data.

The good news is that they *could* use various capacitors
and inductors as transfer standards, measured with a
calibrated bridge to get an idea of where inaccuracies
might lay.

--Winston --"LISN, do you want to know a secret?"