What are type data?

Tags:

  2 minute read  

Type data describe the special characteristics of different types of workpieces. Using type data you can test the specifications of different types of test items with the same test program.

Example

For further explanation see the following example. Various tests are carried out on the voltage monitoring module K523 to prove its functionality specified in the data sheet before it is delivered to our customers. The tests performed on the K523 module can be divided into the following two sub-tests:

  • High-voltage test

  • Functional test

These tests are subdivided into individual processes.

In the process High voltage test the leakage current is to be tested. An attribute is applied to each measurement. To be able to evaluate whether an executed measurement is to be assessed as pass a lower and an upper limit value must be specified for the measured value. The boundary conditions for a test are set via parameters. In the selected example of the high-voltage test on the K523 module the high-voltage tester is parameterised via the TestVoltage and TestCurrent parameters.

typedata example
Figure 1. Organisation of type data using the example of the voltage monitoring module K523:

Process

A process describes the characteristics of a test. Applied to the example with the K523 module, it is the high-voltage test at one position and the functional test at a different position. The type data could be assigned to the processes HighVoltageTest and FunctionalTest. Each process has Parameters, Attributes and Characteristic Lines.

Parameter

Parameters are the values needed to set the components for a test. In the example of the voltage monitoring module K523, this is e.g. the NominalSupplyVoltage, which is applied during the Functional test.

Attribute

Attributes are the values to be measured during a test. They are used to evaluate the results, here, for example, the SupplyCurrent of the DUT[1], which may be between 20.0 - 22.5mA.

An Attribute has the following properties:

  • Name or key

  • Tolerance lower limit value

  • Tolerance upper limit value

  • Unit

  • Decimal places count

  • Evaluation required, this property indicates whether the result of this attribute is to be taken into account in the overall classification.

Before an Attribute is evaluated, the measured value is rounded to Decimal places count.

Characteristic Line

A characteristic line is a two-dimensional representation of the relations between two physical quantities characteristic for the component.

UML Diagramm

uml typedata
Figure 2. Simplified class diagram of the type data
1. Abbreviation for Device Under Test