VC4000 Manual
25
Using Brake Mode
NOTE:
The VC4000PC in brake mode will stop recording data when
the acceleration is positive again. So during the impact if the
accelerometer senses positive acceleration it will end the test. In
brake mode the sample rate is always 100Hz.
1. Drive to the area where you want to take a measurement, or
close, where the slope is the same.
2. To power on, press the
POWE R
key and hold for 1 second
until the unit beeps.
3.
From the “READY” screen press the
2
Bra king
key with the
vehicle at a complete stop. The VC4000 will zero adjust the
accelerometers, show the available record time in seconds,
display the run number being saved, and then display:
4. Press the
Auto Start
key. The VC4000PC will display 'Auto-
Start-Ready' and the current G reading.
5. Accelerate the car to the desired initial braking speed. After
reaching the desired initial braking speed, trigger the
VC4000PC using the external trigger or tap the brakes hard
enough to break the G-Threshold (0.200 default). Then
impact the object.
NOTE:
Be sure to set the G Range back to 2G for other types of
testing so speed and distance are more accurate.
If you are testing a motorcycle or large truck that decelerates by
more than the default 0.200G threshold when shifting or lifting from
the accelerator, to avoid false triggering of your braking run, you may
press the Auto Start key any time after zero adjusting. For example,
you may press Auto Start
after
the vehicle has reached the desired
braking speed and before applying the brakes. If it’s not possible to
PUSH
AUTO START
Avoiding False Triggering
