Face Dipstick 2200 Series, Operator'S Manual

Page: 79 / 107

C
HAPTER
8 - TROUBLESHOOTING
8-3
False Readings
If the Start end of the Dipstick
®
is
forward, but the sequential
reading number is even,
If the trigger is in the wrong
position,
If there is a very large step UP in
the graph, where there should not
be one,
If the IRI is far worse than you
have ever seen before,
If part of the profile is “upside
down”

You must keep track of which end of the Dipstick (battery or
start end) is forward after a reading has been taken. The
sequential number displayed by the computer should be an odd
number when the Switch/Start End of the Dipstick is in the
forward position after that Reading has been taken. If it is not
an odd number, then a false reading has been taken or a reading
has been skipped. If the Start End of the Dipstick
is forward
after an odd number reading has been taken, then the sequential
order is OK. The same is true if the Battery End of the Dipstick
is forward after an even number reading has been taken.
As you
collect data, every once in a while, check to verify that the
Switch/Start end is forward when it beeps and an Odd step
Number is shown.

The trigger should always be pressed from front to back to
collect data. If you have to press from rear to front, you are out
of sequence.

If you see a large step UP in the graph where there should not
be one, this is a False reading.

If the IRI is really really bad, check the graph for a False
reading.

When a false reading occurs, the numbering of the survey line
gets out of order and the polarity of the signs (+ or -) on the
Dipstick will be reversed. This will cause your profile to be
turned “upside down” from the point of the error.
To correct a False Or Skipped
reading:
If you are collecting data in long
lines, you should mark the pavement
with the keel provided in the kit
occasionally to show that a good
reading was taken at a particular
point. If you have occasionally
marked locations along the survey
line with sequential reading numbers,
it will be possible to continue with
data collection from the last point
that was marked by using APPEND.
If there are no known points marked
on the pavement, then it may be
necessary to redo the whole line if a
false reading was taken.
A "Skipped Reading" is where you
turned the Dipstick without taking
data. (You did not wait for the beep)
IF YOU CATCH IT WHEN IT HAPPENS:

STOP! Tap “Stop” to stop collecting data.

Do not move the Dipstick.

Get back to the main menu and use COLLECT/APPEND and
"Last Good Step" from two steps back. (2 steps less than that
shown on the screen)

Collect the rest of the run normally
TO FIX A FALSE READING LATER:
If you have been going either up or down hill, or if the False
Reading is large enough to see easily:

Use REPORT/GRAPH, and estimate within 5 steps or so where
the profile suddenly jumps up.

Then use EDIT/READINGS, scroll down to the bad reading. It
will be very large. Delete the False Reading.

Then press “Change Sign” to change the +/- sign of all
subsequent readings.
TO FIX A SKIPPED READING:

There is no easy way to find the place where you skipped a
reading, so you’ll need to do the Run over.