EXPERIMENTALTESTPLAN In a test plan, you identify the variables that youwill measure, but you also need to look closely atother variables that will influence the result
EXPERIMENTAL TEST PLAN • In a test plan, you identify the variables that you will measure, but you also need to look closely at other variables that will influence the result
Test PlanA test plan draws from the following three steps:1. Parameter design plan. Determine the test objective andidentify the process variables and parameters and a means fortheir control2. System and tolerance design plan. Select a measurementtechnique, equipment, and test procedure based on somepreconceived tolerance limits for error.3. Data reduction design plan. Plan how to analyse, present, anduse the anticipated data
Test Plan A test plan draws from the following three steps: 1. Parameter design plan. Determine the test objective and identify the process variables and parameters and a means for their control. 2. System and tolerance design plan. Select a measurement technique, equipment, and test procedure based on some preconceived tolerance limits for error. 3. Data reduction design plan. Plan how to analyse, present, and use the anticipated data
VariablesVariables are entities that influence the test. In addition to thetargeted measured variable, there may be other variables relevant tothe measured process that will affect the outcome.All known process variables should be evaluated for anypossible cause-and-effect relationshipsA variable that can be changed independently of other variablesis known as an independent variable.A variable that is affected by changes in one or more othervariables is known as a dependent variable
Variables • Variables are entities that influence the test. In addition to the targeted measured variable, there may be other variables relevant to the measured process that will affect the outcome. • All known process variables should be evaluated for any possible cause-and-effect relationships A variable that can be changed independently of other variables is known as an independent variable. A variable that is affected by changes in one or more other variables is known as a dependent variable
Thecontrolofvariables A variable is controlled if it can be held at a constant value orat some prescribed condition during a measurementVariables that are not or cannot be controlled during measurement butthat affect the value of the variablemeasured are called extraneousvariables.215214Sotno21321212.211.Test 1 (30.2 in. Hg)Test2(29.7 in.Hg)C Test 3 (30.0 in. Hg)me(mir
The control of variables • A variable is controlled if it can be held at a constant value or at some prescribed condition during a measurement Variables that are not or cannot be controlled during measurement but that affect the value of the variable measured are called extraneous variables
ParametersWe define a parameter as a functional grouping ofvariablesA parameter that has an effect on the behaviour of the measuredvariable is called a control parameter.Availablemethodsforestablishing control parameters based onknown process variables include similarity and dimensionalanalysis techniques and physical lawsParameter is controlled if its value can be maintained during a setofmeasurements
Parameters A parameter that has an effect on the behaviour of the measured variable is called a control parameter. Available methods for establishing control parameters based on known process variables include similarity and dimensional analysis techniques and physical laws. Parameter is controlled if its value can be maintained during a set of measurements. We define a parameter as a functional grouping of variables