birt code 39

birt code 39

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It s the nature of a tester s job to come across a lot of developer terms; one of these is marshalling. This term refers to sending data between component objects, like the ones you just made in the .exe and .dll files. Marshalling is an advanced concept beyond the scope of this book, but be aware that common bugs occur when the data types in the .exe and.dll files are not the same. For example, if the .exe code thinks that an integer takes up 4 bytes in memory but the .dll code thinks that it should really be only 2 bytes, then there is a problem. Since all .NET languages share a common description of data types, you can communicate between C# and VB .NET components without having to perform some kind of translation. This is not always the case in traditional COM objects, like the ones you create with C++ or VB6. Applications like these often use components called wrappers, which act as translators between components used in traditional COM applications.

Analysis: We convert the power to SI units:

; = 20 mWb;

Next, we compute the armature current as the difference between source and eld current (equation 1734): Ia = Is If = 30 14 = 286 A The no-load armature voltage, Eb , is given by: Eb = Vs Ia Ra = 240 286 06 = 22284 V and equation 1710 can be used to determine the armature constant: ka = 4 1000 V-s pN = = 15915 2 M 2 4 Wb-rad Ea = ka

Knowing the motor constant, we can calculate the speed, after equation 1725: rad 22284 V = 70 V-s s 0002 Wb 15915 Wb-rad Finally, the torque developed by the motor can be found as the ratio of the power to the m =

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Determine the following quantities for the DC shunt motor, connected as shown in the circuit Figure 1721: 1 2 3 4 Field current required for full-load operation No-load speed Plot the speed torque curve of the machine in the range from no-load torque to rated torque Power output at rated torque

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So far you have created a component .dll that holds some validation logic, but you could also create a new .dll that would hold the ReportToFile class that you have been using in the exercises. In fact, you could use all three separate component files for an application. The Validations.dll would be used from a new component file called ReportMaker.dll that held your ReportToFile class; and the BugReporter application would hold your UI code (see Figure 6-7).

01 02 03 04 05 06 07 08 09 10 Field current (amps)

Known Quantities: Magnetization curve, rated current, rated speed, circuit parameters Find: If ; nno-load ; T -n curve, Prated Schematics, Diagrams, Circuits, and Given Data: Figure 1722 (magnetization curve) Motor ratings: 8 A, 120 rev/min Circuit parameters: Ra = 02 ; Vs = 72 V; N = number of coil turns in winding = 200 Analysis:

To nd the eld current, we must nd the generated emf since Rf is not known Writing KVL around the armature circuit, we obtain V s = Eb + I a Ra Eb = Vs Ia Ra = 72 8(02) = 56 V

17

Having found the back emf, we can nd the eld current from the magnetization curve At Eb = 56 V, we nd that the eld current and eld resistance are 72 = 12 06 To obtain the no-load speed, we use the equations If = 06 A and Rf = E b = ka leading to Vs = Ia Ra + Eb = Ia Ra + ka or n= Vs I a Ra ka (2 /60) 2 n 60 2 n 60 T = ka Ia

Figure 6-7. The component files Not all validations have to go into a separate file; if you were making actual testware, you would perform additional testing to determine what validations should be added to one or both component files. If you found validations that would be useful in other testware applications, you would add them to the Validations.dll. If the validations were specific to the ReportMaker.dll, you would only need to add them to that component. If the validations were specific to this particular user interface, you would include them in the BugReporter.exe. For example, say that you want to make sure that the description of the bug is never allowed to be blank. You know that you have a method in the Validations.dll that tests for empty strings. This method returns true when the string is empty and false when it has something in it. So, you would reference the Validations.dll from your ReportMaker.dll and call the TestForEmptyStrings() method as you did in Exercise 6-5. You would use an If statement to determine the outcome of the method and throw an exception when the string was empty (exceptions were covered in 4). Your code would look something like Listing 6-9.

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