Enkel dator oscilliscope (2 / 3 steg)
Steg 2: Att få programvaran för ubuntu.
The sound card should be capable of 44100 Hz sampling via the sound
drivers. You must use an external mixer program to select the input
source device, level, etc. Since these unknowns affect the amplitude,
there is no reference to voltage on the Y axis; it is in fact, unknown.
Instead youre given the scale in pixels per sample unit. Note that
the serial oscilloscope devices dont have this limitation. They have
real voltage labels on the Y axis.
Signal math is only valid if Channel 1 and 2 contain signals of the
same sampling rate. It is up to you to make sure this is the case.
Doing math on signals of different sample rates will produce incorrect
results!
The automatic measurements count zero crossings and divide to determine
the frequency and period. If these zero crossings are not "regularly-
periodic", these measurements could be invalid. Oscope does understand
how to measure the built-in FFT functions by locating the peak fre
quency. Use manual cursor positioning to get more precise measure
ments.
Your sound card is most-likely AC coupled so you will never see any DC
offset. You probably cant get DC coupling by just shorting the input
capacitors on your sound card. Use serial hardware to see DC offsets.
The display may not be able to keep up if you give it too much to plot,
depending on your sound card, graphics card, and processor speed.
External math commands are particularly expensive since the kernel must
then split the available CPU cycles across multiple processes. To max
imize refresh speed, hide all unneeded channels, use point or point
accumulate mode, zoom in on Sec/Div as much as possible, and turn off
the graticule.
Because it uses svgalib, oscope must be run as root or be setuid to
root. xoscope doesnt have this restriction.
Xoscope - oscilliscope
Ubuntu BUGS $ sudo lämplig-få installera xoscope
Fedora 16
The keyboard interface may be confusing.
$ sudo yum installera oscilloskop
Pavucontrol - ljudkort kontroll (äldre system kan behöva använda alsa-verktyg istället) AUTHOR sudo lämplig-få installera pavucontrol
Oprövad:
Oscope was written by Tim Witham (twitham originally
based on "scope" by Jeff Tranter (Jeff_Tranter Oscope is
released under the conditions of the GNU General Public License. See
the files README and COPYING in the distribution for details.
Fedora 16 32 bit
sudo yum installera gtk +-devel pavucontrol Ladda ner och extrahera xoscope arkivet cd till katalogen xoscope . / configure sudo göra sudo göra installera