VC4000DAQ Manual
105
Figure 45: Brake pedal activation switch
The External Activation Input is used for starting the run when one of
the Reaction timers is used, when 12V is applied, or other input
switch is used. This switch allows the operator to
bypass
the Auto
Start G-Threshold. When using the external activation switch the
activation of the test will be
either
the switch or the G-Threshold
(0.2G default) which ever comes first. This switch may be used in
the Acceleration mode as well as the Braking mode.
When using the reaction timer switch the run will start the instant a
key is pressed and a lamp turns on.
When using the brake light switch or brake pedal switch the brake
run will start the instant the brake lights come on or the pedal is
touched, which is typically before the 0.2G threshold is reached.
Drag Factor (Average G) will be
significantly less
when using the
external activation switch because of the increase in time due to the
braking systems mechanical reaction time. The activation switch
may be connected to any 5 – 36VDC input.
Figure 46: External Activation Switch input
Plug in cable before turning the VC4000 power on. To install the
external activation input use an External Activation cable available
External Activation
Plug reaction timer or
other 12VDC activation
source here.
Sensor I
n
put
VC4000DAQ Manual
106
from Vericom Computers, Inc. Or make your own using a connector
and solder sockets available from electronics distributors.
BOM:
Description Part
Number
Molex SL 0.10” crimp housing, Version G Molex, 50-57-9404
2x Box crimp terminals
Molex, 16-02-0102
Assembly instructions:
1. Solder two crimp terminals to one end of the wires.
2. Place the positive wire terminal into pin 1 of the housing.
3. Place the ground wire terminal into pin 2 of the housing.
Figure 47: Molex crimp housing
Insert the black 4-pin connector of the cable into the External
Activation connector located in the back of the VC4000.
