VC4000DAQ Manual
11
The VC4000 has 2 modes: Braking and Acceleration.
Braking
Use the Braking mode to test a vehicle’s brakes or measure the drag
factor of a road surface. From the “READY” screen press
2
Bra king
.
Press the Braking key while at a
complete stop
. If the Braking key
was pressed while reviewing data from a previous test, or if the
zeroing setting was turned off, it’s not necessary to come to a
complete stop before pressing the Braking key. The VC4000 will
use the zero reference from the previous test or if zeroing was turned
off it will use the zero reference established at the factory. See page
89 in setup for more details on zeroing. The VC4000 will zero adjust
the accelerometers to the current angle the unit is facing. Press the
“Auto Start” key before accelerating up to your target speed, or press
it after you’ve reached your target speed if conditions might cause
vibration to prematurely activate the unit.
Basic steps for brake testing:
1. Connect sensors if you are using them.
2. Mount the VC4000.
3. Position the vehicle on the same incline as the test is being
performed.
4. Press the Braking key. Unit will zero adjust itself.
5. Press the Auto Start key.
6. Accelerate up to target speed.
7. Apply the brakes hard and fast and come to a complete stop.
8. Use the arrow keys to scroll through the data.
For further details see application specific sections. Note: Braking
mode always uses 100Hz sample rate.
Modes
Operations Basics
VC4000DAQ Manual
12
Acceleration
Use the Acceleration mode to measure time, speed, distance,
average G and peak G during acceleration. From the “READY”
screen press
1
Acceleration
. Always press the Acceleration key while at a
complete stop. The VC4000 will
zero adjust
the accelerometers to
the current angle the unit is facing. A menu will appear showing
some pre-defined tests and a custom choice. Choose
Custom
to
make your own test. You may also press the Auto Start key to
start a
QuickSet
™ ¼ mile test.
Basic steps for acceleration testing:
1. Connect sensors if you are using them.
2. Mount the VC4000.
3. Position the vehicle on the same incline as the test is being
performed.
4. Press
the
Acceleration key. Unit will zero adjust itself.
5. Select a test from the menu or Press Auto Start key for ¼
mile testing.
6. Accelerate up to the end point.
7. Use the arrow keys to scroll through the data.
For further details see application specific sections.
0-30 mph
0-60 mph
0-80 mph
0-100 ft
0-300 ft
0-5 sec
Custom
AutoStart 1/4 mile
