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- 47 -
Understanding
the Replay Tach
The Mega 475 has a built-in Replay Tach that can
store 9 passes. When the Mega 475 records a pass, the
engine RPM is recorded every hundredth of a second for
fifteen seconds after the Transbrake releases. After a pass
has been recorded and the engine is turned off the pass can
be reviewed on the screen of the Mega 475.
Recording a Pass
To start the Mega 475 recording, the unit must first
be armed. This is done by pressing and releasing the push-
button that is connected to the L.L.P.B. terminal, before the
Transbrake is engaged. With the Mega 475 armed, the
recording starts at the release of the Transbrake, when a
delay cycle is run. While the Mega 475 is recording,
“Recording” will be displayed on the screen. Each time a
pass is recorded the oldest pass, pass 9, is erased.
Replaying a Pass
To replay a recorded pass the engine must be turned
off. Then when the Replay Tach screen is being displayed,
the top row of digits display the engine RPM, with the next
row down being the corresponding time. The time is relative
to the release of the Transbrake. The third line will display
which of the 9 passes is being replayed. The last line will
show the current Shift Point being displayed.
Use the
NEXT
key to select the desired pass to be
replayed. Each time the
NEXT
key is pressed the pass
number will increase by one. Keep in mind that pass 1 is the
most current and pass 9 is the oldest recorded pass.
Once a pass has been selected, there are three ways to
look at information. First, if any shifts occurred during the
recording of a pass, the time and RPM of each shift will also
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