TE Connectivity CBP-5T Mk II Customer's Manual page 38


PARS - This is a dynamic press cycle termination based on actual forces generated during the pressing process.
PARS is defined as "Percent Above Range Sample" (Force Per Pin Limited). This force condition uses a special
algorithm that calculates the average force generated while pressing the connector into the PCB. The "Start" and
"Distance" boxes in the middle of the screen define the bounds for the average. Thus, rather than pressing to a
specific force, the actual force required is dynamically calculated for each cycle and termination is based on this
force. The "%" is an excess force, as a percentage of the calculated average, which is added to the average to
ensure the connector is fully seated.
For example: The "Start Height" is entered as 0.40 mm [.016 in.] and the "Distance" as 0.20 mm [.008 in.].
PARS force is invoked in the 'Force (N)'column, row 4, and 25% is entered. As the connector is pressed,
the force readings taken from 0.40 mm to 0.20 mm [.016 in. to .008 in.] above the board are averaged. The
head continues to press until the force generated is 25% higher than this average. Note that if the force
exceeds 125% of the average before the PARS line (row 4 in this example) is reached, the press will stop
at the higher % value attained when row 4 is reached. The "FPPL" feature means that the press will always
stop on error if Max FPP (specified in the Connector Editor) is exceeded before the specified PARS value
is reached.

PARS from Connector Database- Same as above except the percent, start height, and distance values
are obtained from the connector database entry for this connector type.

Auto PARS – This force condition locates the PARS region that is below the entered "Start Height" and of
the entered "Distance" that has the minimum average force, and performs PARS analysis on it based on
the PARS percentage entered. This is effectively a "rolling" PARS analysis that uses what is theoretically
the best PARS region below the entered "Start Height".

Auto PARS from Connector Database – Same as above except the percent, start height, and distance
values are obtained from the connector database entry for this connector type.

Force Gradient - This technique monitors the rate of change of force to distance. This method is used for
robust components that need to be seated firmly. Generally, the force vs. distance plot will make a sudden
steep upturn as the component contacts the mating surface. The component stops moving so the force
rises quickly. A minimum slope is specified for the upturn, which corresponds to how solidly the component
is pressed. The slope is calculated using the ratio of ΔForce and ΔDistance entries specified by the user.

Force Gradient from Connector Database- Same as above except percent value is obtained from the
connector database entry for this connector type.

Min Force/Pin * Number of Pins - This force is calculated by multiplying the number of pins in the
particular connector being pressed by the minimum required force per pin. Both the number of pins and the
minimum force per pin are entries in the connector data base. This can be used to assure at least a
minimum force is generated during the pressing process.

Max Force/Pin * Number of Pins - This force is calculated by multiplying the number of pins in the
particular connector being pressed by the maximum allowable force per pin. Both the number of pins and
the maximum force per pin are entries in the connector data base. This can be used to prevent excessive
force from being generated during the pressing process.

User Force/Pin * Number of Pins - This variable is provided for the flexibility of defining a force event
variable other than Max and Min force per pin. Its use is up to the programmer's discretion. For example,
while pressing to force it may be useful to terminate on "User Force/Pin * Number of Pins" rather than "Max
Force/Pin * Number of Pins". The variable "Max Force/Pin * Number of Pins" would still be used to
generate an error if the allowable force is exceeded.

User Force/Pin * Number of Pins * - Same as above except a step specific custom multiplier can be
added to adjust the calculated value.

Custom Force – Allows the user to specify a fixed custom total force value will trigger the force action.
Rev C
409-35001
38 of 92