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- SUBPROGRAM FR
-
- After a series of stages are designed with the help of subprograms PZ,
- RP, RPCHECK and MPP, the overall response of the cascaded sections can be
- checked out using this subprogram.
-
- The output of the above subprograms will be the input of this subprogram.
- In some cases the input data may come from other sources, for instance in
- the case of a simple RC section. The data is entered by answering specific
- questions for each section in turn. So it would be well to have on hand the
- printouts from the above subprograms where needed. After each stage is entered
- the final answer given is 'end' or 'E' and the program will compute the
- response of the cascaded stages. This can then be compared with the response
- predicted by PZ so as to confirm that the stages have been designed correctly.
-
- More than one frequency response calculation can be made, focusing on different
- frequency intervals if desired.
-
- ***
- PROGRAM OUTPUT
-
- The output is sent to disk files. For the first run the name of the file will
- be FR1A for the first frequency response, FR1B for the second frequency
- response etc. If new data is entered then the output files will be called
- FR2A, FR2B etc. When the program is stopped completely and started
- again these same names will be reused and the program automatically renames
- the old files by adding a letter to the end of the file name to produce a
- new unique file name.
-
- Once out of the program and back in DOS these programs can be accessed by
- commands such as these:
-
- A:\> type b:fr1a { to write on the screen; the screen can be }
- { stopped and started using control-s }
- A:\> print b:fr1b { if a printer is present }
- A:\> copy b:fr2a prn { if a printer is present }
-
- Inside the program they can be examined using the BROWSE option of the menu.
- ***
- GRAPHICS
-
- During subprogram FR the user has the option of examining the frequency
- response using the FV graphics option. If the output files are to be used for
- graphics then it is advisable to use sufficient sample points to make a smooth
- curve. The minimum should be 50 and the graphics can handle at the most 200.
- If the output files are to be used as printed files then any number of points
- may be used. If the user expects to plot with a log frequency axis then best
- results will be obtained using the log option for the plotting intervals.
- The graphics option may be used later so long as the output files remain in the
- directory.
- ***