control FM sweep.vi modifications

[GoogleCodeExporter]

Desired modifications: 

1. add a button which will pop up a message telling you what the frequency
spacing will be based on the current settings.

2. add a voltage amplitude control (voltage peak-to-peak)

3. add on rf on/off button for channel 1

4. add capability for additional frequencies (or fewer frequencies), as
desired. Six possible frequencies would be sufficient.

5. Change the controls so that we can use a reasonable tab order.

6. Add ability to sync based on a changing magnetic field. That is, take
the specified frequency values and scale them up/down (each second?) with
the ratio of "current field divided by what the field was at the start".

Original issue reported on code.google.com by john.s.c...@gmail.com on 11 Aug 2009 at 8:14

[GoogleCodeExporter]

Voltage control and RF on/off added; halfway there getting the tab order to 
work.

Original comment by mjjohn...@byu.net on 12 Oct 2009 at 4:05

• Changed state: Started

[GoogleCodeExporter]

Tab order now works as expected, and it will track the magnetic field (at
approximately one change per second--I'm not sure the function generator can 
update
faster than this).

Original comment by mjjohn...@byu.net on 23 Oct 2009 at 12:45

[GoogleCodeExporter]

Now allows for a variable number of frequencies to be specified, from 1 on up to
infinity (or rather, until something breaks).  The tab order was sacrificed to 
make
this happen; it could be added back, I think, if it's important, but earlier it
sounded like with the magnet tracking implemented, tabbing was much less 
important.

Original comment by mjjohn...@byu.net on 8 Jan 2010 at 9:48

[GoogleCodeExporter]

Goal: finish by 1/15/10

Original comment by john.s.c...@gmail.com on 9 Jan 2010 at 12:04