Vericom VC4000DAQ, Owner'S Manual, Page: 32 / 66

VC4000DAQ Manual 59
Figure 21: Calibration check on bottom
The VC4000 will show the X, Y and Z axis calibration information.
The total range for each accelerometer should be
2.000 ±0.020 . The
error is half of the indicated number past the decimal point. For
instance if the X axis showed 2.010, then the error is half of 0.010, or
0.005 G.
If you make a mistake and don’t want to keep the data or import it to
Profile, the run can be deleted. Once deleted it cannot be restored.
Select
Delete Run and choose the file number from the numeric
keypad, then press ENTER / YES or simply press ENTER / YES to
select the most recent run without typing in a file number. It will
prompt you to press
ENTER / YES or CLEAR / NO . Pressing
ENTER / YES will delete the run and pressing CLEAR /NO will abort
the delete process. Deleting the run does not free up any memory.
If you purchased Vericom’s portable
thermal printer , one run or all
the runs stored in memory can be printed on it from the VC4000.
Print
Delete Run
X = 1.999
Y = 2.000
Mode – Cal. Check
Z = 1.998
Tools
VC4000DAQ Manual 60
The data printed will be the summary information such as Time,
Speed, Distance, Average G and Peak G along with a graph of the
acceleration vs. time. Connect the printer to one of the RS232 ports
using Vericom’s thermal printer to VC4000 cable, which can be
identified by a sticker that reads “Connect to Printer” on the RJ12 to
Dsub converter end. Use Setup to set the RS232 port to “Printer”.
RS232(1) is set for the printer by default. Select
Print from the Tools
menu, and then choose Print Run or Print All Runs .
The compass built into the VC4000 must be calibrated
anytime it is
moved to a new vehicle, or even if it is moved to a new mounting
location in the same vehicle. This is because the metal in a car has
some magnetic fields and blocks or distorts the earth’s magnetic
field.
Figure 22: Earth's Magnetic Field
The compass heading shown on the VC4000 is relative to
magnetic
heading , which is not exactly the same as the geographic heading
because of how the earth’s magnetic fields lay. Also the fields vary
by your geographic location on the earth. For instance in central
California the difference between magnetic north and geographic
north is 16° to the East. So when the VC4000 shows 16° east you
Compass Calibration