On Feb 16, 4:52*pm, Winston 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?

jsw