Notes on the Sine Wave Java Applet
To make the display advance one 15 degree step press
'Stop'
then 'Forward' once for each step. Pressing 'Reverse' decreases the degrees
one 15 degree step at a time.
In 'Three Phase' mode the degrees always increase in
'Go' mode.
In reverse the display will show two of the wires to the three phase motor have
been reversed.
Various information about the Applet is
shown on the browser 'Status' line, usually at the bottom left of the browser
frame.
When the Applet begins there is a delay while the
background pictures load. With the browser and ( rather slow ) computer I am
using it takes some time for the pictures to load. If you want to reduce
the picture load time you can edit a copy of this file in Notepad and change
"4000" to what ever value you like. If you set the value too small the
picture may not load at all.
<PARAM
NAME=picture_load_time
VALUE="2500"
> <!--
milliseconds -->
Pressing Go repeatedly ( six times ) in
Three Phase mode will cause the milliseconds per cycle to be displayed. Notice
that this value varies somewhat. If the computer is doing something else at the
time the sine wave display is to be updated the update is delayed until the
computer processor again returns to the Applet. A faster computer will
probably reduce this fluctuation.
The control buttons are drawn from data
stored in arrays in the computers memory. To see the contents of these arrays
hold 'Shift' and press ? . To reset to normal
press / . You will see a lot
of flickering while viewing the button parameters. Normally an image that is to
be displayed is first drawn in off screen memory. When the image is finished
it is then displayed to the screen image.
Press 'Stop' more than six times to stop the
sine wave image from updating the screen. Pressing 'Go' will cancel. Even with
the sine wave update turned off the program should still update the background
image now and then. If the Applet frame is moved off the edge of the browser
frame then returned Applet's background will be blank until it updates itself.
