3-3
to step 4. Otherwise, set the counter to operate in this mode, and start
a count. Start the TCTII in A to B, B to A mode. The TCTII will simu-
late a 9 foot vehicle in alternating directions. The count on the display
will be updated after every second vehicle. After the 15 minutes has
ended, both directions should have the same value as is shown on the
TCTII display.
Step 4 - Test Class
Reset the Output dial to 10.
To test the classification mode of your
counter (if it has the capabilities to do so), set the TCTII to CLASSIFY
mode and setup the counter to classify with two road tubes. After en-
suring that the counter and the TCTII are set to the same tube spacing,
start the count and the TCTII. The class of the vehicles that are then
shown on the counter should match the TCTII.
Step 5 - Test Speeds
Reset the Output dial to 10.
To test the counter’s ability to measure
speeds, set the TCTII to SPEEDS mode and setup the counter to mea-
sure speeds. After ensuring that the tube spacings are the same on the
counter and TCTII, start the count and the TCTII. The speed of the
vehicles that are then shown on the counter should match the TCTII.
After the TCTII has stopped, use your analysis software to verify the
results. Each speed (in steps of 5 mph) should have the same number
of counts, with the possibility of the higher speeds being low by 1 or
2 depending on your speed groupings. The total number of vehicles
recorded should match the number on the TCTII.
If you encounter a discrepancy during any of these steps, double check
your setup to be sure the tubes you are using for the testing are the same
length. Also check that the Output dial is set to the proper level and that
there is no blockage in the counter’s nozzles. Once you have verified your
setup, retest the counter. If the same discrepancy occurs, the counter many
need to be serviced.
Chapter 3 — Certifying Counters with the Traffic Counter Tester II
