3550 Battery HiTESTER Series
17
(3)The battery terminals are not in proper
contact, so that measurement is not carried
out for all 4 terminals.
(4)The measurement lead is broken.
(5)The battery temperature is different.
(6)There is a large ripple voltage across the
battery terminals.
10 Miscellaneous………….…...………………………………………
Q1. Up to what capacity is testing
possible?
A1. It depends on how many valid digits the user
requires. Batteries have a smaller internal
resistance the larger their capacity is. As a
guide, in the case of a lead storage battery with
a capacity of about 400Ah, the resistance is
approximately 0.5mΩ. When measured with the
3550 or 3551,the result would be about 50
counts or 500 counts. Alkaline storage batteries
have an even smaller resistance.
Q2. What is the relationship
between the deteriorated state
and the internal resistance?
A2. According to a JAPAN STORAGE BATTERY
ASSOCIATION Technical Reference (SBA3508-
1984), once the capacity drops below 80%, it
decreases at an accelerating pace; therefore,
the point at which the capacity drops below
80%is regarded as a guide for determining
when a battery has reached the end of its
operational life .At this point, the internal
resistance of the battery is about 1.5 to 2 times
greater than when it was a new battery.
Accordingly, even if you do not know what the
internal resistance of the battery should be
when the battery is in good condition, it is
possible to measure the internal resistance at
regular intervals and use the extent of the trend
towards increased resistance to estimate the
deterioration of the battery.
Q3. Can a battery other than an
alkaline battery be used for the
power supply?
A3. Manganese dry cells can also be used.
Although ni-cad dry cells can also probably be
used, the system shuts down soon after the
battery indicator first appears, so from the
standpoint of saving data, we cannot
recommend the use of ni-cad batteries.
Q4. Aside from AC resistance
measurement, what are
methods are available for
diagnosing batteries?
A4. There are basically two methods for evaluating
the deterioration of a battery. One is to directly
measure the discharge capacity of the battery
by conducting charging/discharging testing.
The other is to measure the internal resistance
and use that information to estimate the
deterioration of the battery. There are
furthermore two method for conducting
charging/discharging testing: discharging a fully
charged battery until it is completely discharged,
and discharging a fully charged battery for a few
minutes and then using that information to
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