Sheet #607u – ATR 0 – 1 – 2 – 3 function
Version 1.04a User guide ATEQ 6th series Page 3/6
Associated parameters to be set:
¾Start (Initial value of the transient),
¾Transient (actual and non modifiable value of the transient),
¾Percentage drift (Drift tolerance on acquisition of the transient, as a % of the reject level).
When a parameter is modified but no learning cycle has started, an ATR error occurs. The
Alarm and End of Cycle outputs are activated.
A learning cycle may be carried out when the measured value is greater than the reject level.
After the learning cycle, the Pass and End of Cycle outputs are activated.
1.4. ATR3
This is the same as the ATR2. The difference is, if the measurement result is negative, then the
measurement absolute value is displayed.
Associated parameters to be set:
¾Start (Initial value of the transient),
¾Transient
(actual, non modifiable value of the transient),
¾Per
centage drift (Percent of the reject level, the measurements used for transcient
calculation are less than this value).
¾Drift (Drift tolerance on acquisition of the transient, as a % of the Reject level).
1.5. T
RANSIENT DRIFT
Due to the evolution of the test conditions (temperature variations...), the value of the transient
can vary through time. It is therefore necessary to track its evolution.
To avoid having to carry out learning cycles too often, the ATEQ instrument saves the last ten
values of parts considered as very good (result close to 0) and recalculates the transient using
the average value.
Parts are considered as very good when their leak rate is lower than the “percentage drift” value
of the reject level. This value can be modified between 0 % and 100 %.
10
partsgoodvery10lasttheofvaluetheof
Transient
¦
The transient attenuation (ATR) can only be used on parts that behave in a very similar
way during the test, in other words, parts that have similar transients.
When the batch of parts changes or when the production is stopped for a certain time, it
is necessary to carry out a new learning cycle, as the transient will change.
The ATR error appears if the difference between the transient and the initial (start) value is
greater than the reject level.
The transient can evolve one way or the other; therefore it is preferable to have identical Test
and Reference reject levels.
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