SHIMPO 921A - Manual (Page 30)

A.1
TRICOR Systems Inc.
APPENDIX A
RESTRICTIONS AND WARNING / PROBLEM / FAILURE
MESSAGE DESCRIPTIONS
Max Force Restriction
Max Force parameter will establish the end of inward travel (bottomout). Max
Force should be set to a reasonable value for the device under test. If the
Max Force is set to small, the inward test range may not reach the desired
bottomout point of the device under test. If the Max Force is set to large
excessive force may be applied to the device under test.
Test Range Travel Restriction
The system can store a maximum of 2,500 data (log) points inward and 2,500
data (log) points outward. With the .0001" lead screw this is approximately
.25" of travel in and out when operating in the 1 step/log mode. Note that this
travel is the test range travel (free position to bottomout) and not total
platform travel. If the test travel range exceeds the 2,500 data (log) points
(more than approx. .25") then invalid results will occur. The configuration
must be changed to increase the steps/log (i.e. 2 steps/log provides ~ .5" test
travel with the standard .0001" lead screw). The user must configure the
parameters properly for the device under test to ensure the test travel does
not exceed the logging capacity of the system, or the test results/data will be
invalid.
Ref Blk Size Restriction
Two restrictions apply to the Distance Reference Gauge and Ref Blk Size.
One is the combination of the platform travel and the Ref Blk size cannot
exceed 6.5535 inches. The other is the location or reference point
established during the calibration cycle using the Distance Reference Gauge
and Ref Blk Size must occur further inward than device bottomout during
device testing. In other words, the reference point must be further (more
travel) away from the platform home position than the device bottomout point
during testing. Failure to comply with these restrictions will cause invalid
results.