SHIMPO 933 - Manual (Page 26)

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When the break update run mode is selected, the user is caution to enter a relatively
large value. The LCTS is a life cycle tester. It is not intended to take data readings with
every test cycle. Windows has unpredictable timing. Setting the update count less than
20 usually get the LCTS and software application into a race condition which eventually
locks out the communications. Close and restart the application to restore
communications. Use an update count greater than 100.
Force Adjustment
Maximum test force is set by limiting the air pressure applied to the air cylinder. The
pressure regulator and gauge for reading the pressure are on the front panel of the LCTS
(Figure 3). The force is determined by a simple equation.
Force = Pressure • Piston Surface Area
The piston of the standard LCTS has a diameter of 7/16 inch which results in a surface
area of 0.150 inches
2 . The force is then
Force (lbs) = 0.150 • Gauge Reading (lbs/in 2 ).
Setting the pressure to 40 psi will give a force maximum of 6.0 lbs. The maximum
pressure should not be set above 45 psi. The internal air values will begin to leak above
this pressure.
Speed Adjustment (Option)
Some LCTS are equipped with air flow rate restrictors. These permit the velocity of the
cylinder stroke to be reduced. The tested device is impacted with less acceleration force.
The flow rates for the up and down strokes can each be independently set. The
adjustments are accessible through covered openings on the right side of the LCTS. A
long, flat blade screwdriver is required. Remember that restricting flow rate will lengthen
the test cycle time.