3550 Battery HiTESTER Series
11
Q5. Describe the equivalent circuit
for a battery.
A5. The equivalent circuit for a battery is shown
below. In the diagram, "E" represents the
electromotive force, "L" represents the
inductance of the plates and conductors,
"R1"represents the resistance of the electrode
plates and the electrolytic
solution,"R2"represents the resistance of the
movement of the electric charge between the
electrode plates and the electrolytic solution,
and "C" represents the electric double layer
capacitance. This shows that internally, a
battery exhibits not just resistance, but also
impedance that includes capacitance and
inductance. Synchronous wave detection is
a method of measuring just the real
impedance. The 3550 series uses
synchronous wave detection to measure real
impedance.
Q6. Is the resistance displayed by
the 3550 series impedance, or
is it pure resistance?
A.6 A battery's internal resistance is the vector
sum of a resistance component and a
reactance component. Because the 3550
series uses the synchronous wave detection
method, the reactance is eliminated by analog
means and only the (real) resistance
component is displayed. Therefore, the
measured value is not impedance, nor is it
pure resistance; it is the real component of the
impedance (the effective resistance).
Q7. What is "synchronous wave
detection?"
A7. This method detects the test signal by using a
reference signal that is in phase with the test
current. This method is much like a type of
filter circuit. This method demonstrates
excellent frequency selectivity characteristics
for the frequency of the reference signal.
Another characteristic of this method is that it
cancels out the reactance component (the
false portion of the impedance), eliminating
that component from the test results.
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