3550 Battery HiTESTER Series
14
End of a 9640 Clip-type Lead with
Temperature Sensor
8 Temperature Measurement…...……………………………………
Q1. Why is temperature measured? A1. Temperature measurement is important for
two reasons. One is because the internal
resistance changes according to the
temperature. This allows workers to use the
temperature of the electrolytic solution to
determine the extent of battery deterioration.
Another reason is to discover damaged
batteries. A battery with an internal short
circuit will reveal itself by heating up when it is
charged. Although the 3550 and 3551 is not
able to measure the temperature of the
electrolytic solution, it is able to measure the
temperature of the terminal, which is close to
the temperature of the electrolytic solution.
However, in a 12V lead storage battery,6
individual batteries are connected in series;
we have heard that even if one of those
batteries is damaged internally, the terminal
temperature does not rise very much.
Q2. Why is the temperature
measurement sensor inside the
probe?
A2. This was done in order to avoid adding to the
work that the worker must do. Because the
temperature sensor is built into the test probe,
the terminal temperature can be measured
simply by clipping the probe onto the terminal.
In addition, measuring the terminal
temperature rather than the ambient
temperature provides a clearer picture of the
degree of battery deterioration.
9 Batteries………………….…...………………………………………
Q1. Does the internal resistance of a
battery change after charging or
after discharging?
A1. Yes. When measuring the internal
resistance of a battery with the 3555,the most
accurate measurements can be taken when
the battery is fully charged. Because
maintenance is performed on a UPS with the
3550 and 3551 when the battery is in a
normally charged state, this issue is not a
concern.
Q2. Does the internal resistance of a
battery change according to its
temperature?
A2. The internal resistance does change
according to the temperature. Sample
measurements taken by HIOKI for reference
purposes are included at the end of this sales
guide in the paper on "Applying Low
Resistance Measurement Techniques to the
Evaluation of the Performance of Backup
Batteries."
Refer to the reference material
at the end of guide.
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