Daktronics C44 - Manual (Page 35)

C-44 Race Timer 3-7
Operation
If the cars had been racing at an actual sea-level track with dial-ins of 10.25 and
10.17 respectively, the handicap would be 10.25 - 10.17 = 0.08 seconds. The
concept of altitude corrections assumes that both cars in the race will be affected to
the same percentage by the thinner air at altitude. Thus, both cars’ E.T.’s are
adjusted by the same altitude factor. The altitude E.T.’s are thus 10.41 and 10.32
respectively.
A fair race based on the altitude corrections concept, therefore, requires that the
resulting handicap at altitude will be 10.41 - 10.32 = 0.09 seconds.
Using Altitude Adjustment
To set the race controller for altitude adjustment, press <CTRL><F1> to get the
Setup Parameters menu, followed by <A> to access the Altitude Adjustment Factors.
The <TAB> or <ENTER> key is used to move the highlight bar to the Altitude
Adjustment On:__ line. Press the <SPACE BAR> to alternate between Yes and No.
Similarly, the Factor # can be selected by moving to the Factor: __ line and pressing
the <SPACE BAR> until the desired number is displayed.
Once the factor sets have been preset (Refer to <A> Altitude Adjustment Factors in
Section 3.3), they can be selected as described above. The current selection of
adjustment factors is displayed on the monitor. Also, an A1, A2, or A3 will be
printed on the time slip to indicate which adjustment factor set has been selected.
Using Dial-ins With Adjustment Factors
When a dial-in is entered, it is assumed to be a sea-level dial-in. This usually comes
from a published index or, in the case of E.T. racing, from the time slip of an earlier
altitude-adjusted time trial run.
For the tree handicap countdown, the sea-level dial-in that is entered for each lane is
divided by the current E.T. adjustment factor to give the proper handicap difference
based on the two cars performance at altitude. This insures a properly matched
handicap race. Since the E.T. used to determine breakouts is a sea-level E.T., it is
compared to the sea-level dial-in to determine if a breakout has occurred.
Note: The system does not allow any dial-in's greater than 99.99. Therefore, if an
adjusted dial-in figures to be greater than 99.99, the originally entered dial-in will be
used for the tree handicap.
Figure 5: Identical Race as in Figure 2, but without Altitude Adjustment