4.4.9 Calibration Procedure
The purpose of this procedure is to determine the number of vehicle speed
pulses per km or mile. Before starting this step, drive the vehicle to a measured km
or mile start point. Bring the vehicle to a complete stop at the start point.
This step puts the taximeter into a mode that counts pulses while the automobile is in motion. At
the start of the mode, the display will show a zero, indicating that it is ready to start counting
mileage pulses (see Figure 17). Begin driving, and the taximeter will count pulses.
Figure 17 The Calibration test initial value of 0 pulses counted.
Button actions at this point:
i) Press to stop the test.
ii) Press a subsequent time to restart the test.
iii) Press to enter count into memory, and exit back to Vacant Mode.
We recommend repeating the calibration procedure 2 – 3 times to ensure that the
counts are fairly consistent. If you see a large variation between subsequent calibration
procedures, you may have a problem with your installation. In that case, ensure that
you are connected to the correct vehicle speed sensor wire, and that you have
grounded the taximeter to the car battery.
4.4.10 Adjusting the Sensitivity during Calibration Test
If your CG3 has the built-in Signal-Conditioner i.e., the Serial Number is 31000 or greater
(section 4.7), you can fine-tune adjust the sensitivity of the VSS detector circuit repeatedly
while in calibration mode.
While in Calibration Procedure (4.4.9, above):
i) Press to stop the test.
ii) Press or to display the current sensitivity value.
iii) Press or to adjust the value.
iv) Press to enter new sensitivity value, and return to calibration test.
You can repeat this multiple times until you are satisfied with the results.
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