Section 2
OPERATION
TIMEWISE 798A
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“+ / –” toggle switch to execute the function. The 798A will compute your new odometer
factors. The currently active factor (visible in the
CLOCK
display) will be updated to its new
value, and the official odometer check distance will be entered into the main odometer.
Note: The other factor in the 798A associated with the active odometer input will also be
corrected. If you subsequently select the other factor, don’t be surprised to see that it, too,
has a new value. Contact Timewise if you don’t want this feature.
Here’s the step by step method to execute the automatic factor calculation:
1. Reset the main odometer at the start of the odometer check.
2. Select
Odo Check
and adjust the
AUXILIARY
display to show the official
odometer check mileage.
3. Drive the odometer check route.
4. At the end of the odometer check make certain
Odo Check
is selected, depress
and hold
SHIFT
, and then actuate any “+ / –” toggle switch.
When executing the
Compute Factor
function, the 798A internally resolves distance to ten
thousandths of a mile (.0001). If you decide to double check the accuracy of the 798A by
manually computing the factor, you will not have such resolution available. As a result, you
may compute a slightly different value than does the 798A. After a ten mile odometer check,
the factor calculated by the 798A can be 0.01% smaller than the value you calculate (using a
resolution of .001 miles). A greater difference is possible if the distance is shorter.
IMPORTANT!
There are three major items to note when using the automatic factor calculation.
First, the calculated time remains unchanged following an automatic factor calculation.
Do not assume the calculated time is corrected following the procedure. It does not happen.
(The auxiliary odometer also remains unchanged.)
Second, when you execute an automatic factor calculation, all four odometer factors may
undergo a correction. That is, the factors associated with the inactive odometer input may
also change. However, to automatically correct those factors, you must have a functioning
transducer attached to the inactive input during the odometer check. (You can use the signal
duplicator jumper plug to simulate a transducer, if you want.) If a transducer is not attached
to the inactive input, the 798A senses this and does not change the associated factors.
Lastly, correct base values for the unused factors (the second factor for the active input, as
well as both factors for the inactive input) must have been set into the 798A. This is because
the 798A computes a correction percentage for the active factor, and then applies that same
percentage adjustment to each of the other factors (unless, as mentioned above, the inactive
input is not receiving a signal, in which case the factors for that input are not changed).
Other items to note:
❏
You must not change the factor or the odometer input during the odometer check.
❏
The automatic calculation uses the overall distance measured by the 798A when
figuring the new factor. Do not split the 798A at the end of the odometer check and
drive beyond the reference marker before executing
Compute Factor
. If you do
so, the 798A will compute incorrect factors. The 798A uses the actual distance
driven, not the split value
.
