LS SDHT User manual

Larson Systems Inc.
13847 Aberdeen Street NE Phone: [phone]
Ham Lake, MN 55304-6789 Fax: [phone]
www.larsonsystems.com Email: [e-mail]
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How to Use SDHT Pass Through Testing
When using Pass Through Testing, a target value (either in Force or
Length), must be preset. If using a Two Point mode then two target values
must be preset.
There are two limitations when using Pass Through Testing:
•First, Pass Through Testing data storage is finite. When performing
a test, the amount of storage used will be displayed. When storage
reaches 100%, the test will finish even if the target has not been
passed.
•Second, to get the best readings the rate of force change must be
below a certain level. This changes with the rate of the part being
tested. If the tester detects the rate of change of the force is too high
a message will be displayed suggesting to slow down.
Setup
Each testing mode, Manual or any of the Two Point with Rate
modes, has its own target values. The mode to be used must
be selected using the MODE button before accessing the Pass
Through Testing setup menu.
1) Press the OPTION button until the screen shows “Pass
Through”.
2) Press F1 to enter the “Setup” menu.
3) Using the F1 button select the target measurement: Force or
Length.
4) Press OPTION to go to the next menu.
5) Using the F1 and F2 buttons, enter the target value.
6) Press OPTION to go to the next menu.
7) If the current mode is a Two Point mode then a second target
can be entered.
8) When all target points are set press the OPTION button to
scroll back to the 1st target point.
9) Press the ON/CLEAR button to exit back to the primary
display. If you want to immediately start the Pass Through
Testing mode, press the SEND button to move up a menu
level and press F2 to Start using Pass Through Testing.
Using Pass Through Testing – Continued on Page 2

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Using Pass Through Testing
1) Use the MODE button to select the testing mode to be used.
2) If Pass Through Testing setup has not been performed already, preset the Pass Through
Testing targets as described above.
3) Start the Pass Through Test.
a. If the Pass Through menu in not being displayed, press the OPTION button until the
screen shows “Pass Through”.
b. Press the F2 button to Start Pass Through Testing.
c. The menu display will close and the display will return back to the primary display.
4) The message “Hit F1 to Start” will flash on the screen.
5) Prepare the part for testing by placing it on the tester, then press the ZERO FORCE button to
remove the weight of the spring from the reading.
6) Press the F1 button to start the test.
7) The Pass Through Testing data storage usage buffer will show as a percentage in the upper left
corner of the display. Before the display reaches 100% move the upper platform to pass through
the target position(s).
8) When the target has been passed or when the display hits 100% the result will be shown.
9) At this point result can be written down, stored, or sent out the printer port.
10) If the rate of change of the force was too fast, a message will be shown suggesting to slow down
the testing.
a. The rate of change is only checked near the target. It is possible to rapidly move the
platform to a point near the target. This is useful when passing through the second point
of a two point test.
11) Press the ON/CLEAR button to clear the measurement to prepare for the next test.
12) When finished using Pass Through Testing, the feature must be turned off.
a. Press the OPTION button until “Pass Through” shows, then press F2 to Stop the Pass
Through Testing mode. Press the ON/CLEAR button to return to the primary display.