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Preparing for a Test
Determining When to Stop a Test
The setting used for the "Test Mode" parameter determines how and when a transmission rate test is
stopped (Test Completion). Four different methods of stopping a transmission rate test are provided. The
four methods are: "Continuous", "Standard", "Convergence By Cycles" and "Convergence By Hours".
The Continuous mode executes until manually stopped by an operator. The Standard mode executes for
the number of cell examination cycles specified by the "Number of Cycles" parameter. The Convergence
modes execute until equilibrium is achieved as defined by the convergence parameters.
Unless the characteristics of the test sample are well understood, the continuous mode should be used. If
the test is stopped prematurely the transmission rate reported will not reflect the true transmission rate for
the material. For more detailed information on the "Test Mode" parameter see the Instrument Help system.
Choosing a Test Method
There are three different ways to specify how a permeation test is to be performed. These "Test Methods"
are described briefly in the following section. For more detailed information see the Instrument Help system.
The Auto Test Method
The Auto-Test Method removes most of the requirements for the user to make decisions regarding
test methodology. The Auto-Test Method utilizes an internal rule-set to dynamically optimize test
parameters and an advanced dynamic convergence algorithm. To perform a test the user just needs
to enter the sample identification information and the standard test conditions (Test Temperature
and RH). For more information see "How the Auto-Test Method Works" in Appendix D.
A test performed using the Auto-Test Method may take longer to complete due to stricter
requirements for Test Completion (when a test is stopped). The Auto Test Method does not allow
the flexibility of specifying exactly how the test will be performed.
The Advanced Test Method
The Advanced Test Method allows the user to specify all of the parameters and conditions used to
perform a permeation test. An Advanced Test Method allows the most flexibility in determining how
a permeation test will be executed. The Advanced Test method also allows Test Sequencing.
Saved Test Methods
Saved Test Methods are Advanced Test Methods that have been saved and can be recalled for later
use. Saved test methods are accessed using the "Methods" control displayed at the bottom of any
Advanced Test Method screen.
Using Test Sequencing
The Sequential Testing function allows a series of tests to be performed on the same samples at different
test conditions (Temperature and RH). Once started a sequential test series will execute all of the tests in
the Sequential Test Parameters table without requiring user intervention.
The series of test to be executed is defined by enabling the Sequential Test function in an Advanced Test
method and defining the individual test conditions using the Sequential Test Parameters Table. For more
information see "How Sequential Testing Works" in Appendix D.
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OX-TRAN Model 2/12 R Operator's Manual
Revision L
MOCON, Inc.
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