Midtronics GR8 1100, Instruction Manual

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Diagnostic Charge Results
The GR8 displays one of three battery decisions (GOOD
BATTERY, REPLACE BATTERY, REPLACE-BAD CELL) and an
analysis, which includes the battery State-of-Health (SOH).
Refer to the screen illustrations on this page.
Use the
UP
( p ) or
DOWN
( q )
ARROW
keys to scroll to each
screen. To return to the Main Menu, press the
EXIT
soft key.
To print, press the
PRINT
soft key.
IMPORTANT:
When you start a new test, the last
battery test in memory will be overwritten. Re-
member to record or print the results if you need
to retain them.
State-of-Health (SOH)
Another factor affecting a battery’s ability to crank an engine
is its actual condition or State-of-Health (SOH). It is a measure
of the battery’s condition relative to a fresh battery. Based on
cranking rating, open-circuit voltage, conductance (ability to
deliver current) and battery temperature, the GR8 will not only
qualify a battery as “good” or “bad” (should be replaced), but
can also identify a “marginal” battery.
Although a State-of-Health problem can be the result of
defects in construction, it is most often the result of normal
wear-out mechanisms, which are dependant on vehicle needs,
climate, and operating conditions. This results in irreversible
physical and chemical changes until eventually the battery
can no longer hold a charge and supply the power necessary
to start the car and provide auxiliary power to the electrical
system.
As the battery approaches end of life, its deterioration
accelerates, until it finally fails to start the vehicle. Before
failing, the battery may start the vehicle under normal
conditions but may not be able to operate in more extreme
conditions. Extreme heat or cold could expose a weak battery
and cause it to fail.
BAD CELL-REPLACE Results: Diagnostic Charge Mode
Screen 1 of 3
Screen 2 of 3
Screen 3 of 3
A measurement near the
line on the right suggests a
marginal battery.
Measured
voltage
Measured
capacity
Selected
rating
The results include a
Midtronics information code
for ALL decisions.
Total charging
time
B a t t e r y
decision
R e p l a c e d
amp hours
The line on the graph marks
the Pass/Fail threshold for the
battery.
A measurement to the
left of the line indicates
a REPLACE decision.
A measurement to the right
indicates a GOOD battery.
Chapter 6: Charging Menu—Diagnostic Charging GR8 1100
Midtronics Inc. 7000 Monroe Street Willowbrook, IL 60527 www.midtronics.com