VC4000DAQ Manual
61
are actually pointing geographically north at 0°. See the following
declination chart.
Figure 23: Magnetic declination chart
For a more accurate declination chart see web site:
http://www.ngdc.noaa.gov/seg/geomag/declination.shtml
or search the web for more accurate tools.
NOTE:
The VC4000 must be mounted
relatively level
to get the
most accurate compass data.
Tools
VC4000DAQ Manual
62
Compass Calibration
1. Install the VC4000 relatively level in the vehicle where it will
be mounted during testing.
2. Turn compass on in the VC4000
a. Tools/Setup/Sensors…/Sensors
Internal/Compass.
b. Select
On
or
On-Record
then press
ENTER / YES
.
c. Press
CLEAR / NO
3 times to get back to the Tools
menu.
3. Scroll down to Compass Calibration and press
ENTER /
YES
.
4. Drive the vehicle in 2 or more complete tight circles.
5. Press a key to stop the calibration.
6. Display will show some diagnostic information. Press the
CLEAR / NO
key to get back to the Tools menu.
The VC4000 can copy stored runs onto a
Secure Digital Flash
Card
(SD card). The SD card does not need to be installed into the
VC4000 during testing. It is used for transferring data from your
VC4000 to a computer in lieu of a USB cable, RS232 cable or
Bluetooth connection. The VC4000 stores all runs in internal flash
memory until you clear them. External flash memory (SD Card) is
not fast enough to store the data from the VC4000 as it’s running. A
typical 1GB SD card will hold over 200,000 runs.
Figure 24: SD Card slot
SD Card Options