User's Manual

PASS-TCU User Manual 11
Power-off: A component shall be considered "Power-off", when it is not electrically connected to a power
source, as in case of shipping or storage conditions. “Power-off” condition may require use of mating
connectors during some of the tests and shall be specified clearly in the “Test Parameters”.
PTC: Positive Temperature Co-efficient (Device with PTC feature shuts off power supply or reduces certain
component applications (e. g. CD-playing for a car radio) when device temperature goes above certain
maximum operating temperature specified).
PV: Production Validation.
Soak Time (T
soak
): Time taken by component to reach chamber ambient temperature at high or low
temperature during thermal cycling tests from the time chamber temperature reaches corresponding high or
low temperature levels.
Temperature class: Classification of maximum temperature a component will experience based on its
mounting location and specific packaging variations in the vehicle.
T
min
: Lowest ambient temperature experienced by any component (Usually -40 0C).
T
max
: Highest ambient temperature experienced by any component. Value of Tmax depends on temperature
class of the component.
Usage Life Profile (ULP): It is a software tool that assists in selecting the applicable qualification tests and
test parameters for a component based on input data such as design or service life, in-vehicle component
location, customer driving/usage pattern or other environmental stresses.
Vibration Class: Classification of vibration intensities a component will experience based on its mounting
location in the vehicle.