Vehicle starting battery cold-cranking AMPS meter and method
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United States of America Patent
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-
Aug 1, 2000
Issued Date -
N/A
app pub date -
Feb 23, 1998
filing date -
Sep 8, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicle starting battery cold-cranking amps meter and associated method includes providing a current source, a voltage meter, a current meter and a control. The current source produces a current pulse during a brief time interval at a known magnitude that is less than rated cold-cranking amps of the vehicle starting battery being tested. The volt meter measures battery terminal voltage of the vehicle storage battery being tested while the current source is sourcing current to or sinking current from the vehicle starting battery being tested. The control determines internal impedance of the vehicle starting battery being tested from the terminal voltage of the vehicle starting battery while the current source is sourcing current to or sinking current from the vehicle starting battery being tested and determines cold-cranking amps from the internal impedance and an output of the temperature meter.
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