1] Acquisition Menu - Mecmesin MultiTest-x Series Operating Instructions Manual

Mecmesin MultiTest-x manual

[1], [3], [1] Acquisition Menu

[1], [3], [1], [1] Threshold
The 'threshold' is a force value (in the units indicated)
that, once exceeded, will trigger subsequent logging of data. Any value between zero
and the capacity of the testing machine can be entered. If the threshold value is set to
zero, data logging will start at the moment the test starts. Under all other
circumstances, a force value exceeding the threshold value must be observed before
logging of data is initiated. Data logging must occur for specimen break, analyses and
limits functions to activate. If no data have been logged, recalculation will not function,
and there will be no data available to send to the computer.
[1], [3], [1], [2] Sample Break
The 'sample break' feature will stop the test when the force value drops below the
maximum value observed by the percent entered. For example, if a percentage value
of '10' has been entered, and a test is running in which the maximum value observed
has been 100newtons, then, at any time after the observation of that maximum, the
test will end whenever a load value of 90newtons or less is observed.
If the percentage drop is set to too low a value, typically 5% or lower, false triggering
could occur due to signal 'noise', or the specimen slipping in the grips. Similarly, if the
percentage drop is set to too high a value, typically 80% or greater, the specimen is
likely to have broken in two before the software deems a break to have occurred.
If the percentage drop is set to 100, the sample break feature will be disabled, i.e. the
test will be only be terminated by the Control section of the program or when the
[Stop/BK SP] key is pressed.
If a test is configured such that the force goes from tensile to compressive (i.e.
through zero load), then the sample break must be disabled. Similarly, if a procedure,
19