On Oct 23, 1:23 pm, Eric Jacobsen <eric.jacob...@ieee.org> wrote:
> He's talking about zero-span on typical spectrum analyzers, which
> allows a time-domain view of the signal like an oscilloscope.
>
> I think it boils down to working a lot like an oscilloscope in that
> mode. I'm not completely sure what the question is in that regard.
Yes, but it sounds like he's got it free running. HP/Agilent (and
probably most other) analyzers offer a video level trigger mode, but
in my experiments it is primitive compared to a scope's trigger
circuit. On the other hand, it's implicitly a storage scope so you
can single shot it. But again, on ours at least there's not single
shot button, you have to change to repetitive and change back.
Basically - the start of a good capability, but not finished in the
model I was playing with.
Reply by Jerry Avins●October 23, 20082008-10-23
Eric Jacobsen wrote:
> On Thu, 23 Oct 2008 10:02:33 -0400, Jerry Avins <jya@ieee.org> wrote:
>
>> PARTICLEREDDY (STRAYDOG) wrote:
>>> hi all,
>>> small doubt..i was Spectrum analyzer..all along in place..where
>>> i work.but..i was wondering..how..by providing external trigger..the
>>> time domain (zero span signal) is stabilized and locked to external
>>> trigger and its stable and not moving in the view screen..
>>>
>>> ofcourse..i will select..trigger option as external trigger...instead
>>> of free run..
>>>
>>> can anyone..point to some literature or explain..the underlying events
>>> happening..
>> What instrument do you mean? It seems to me that you described an
>> oscilloscope display.
>>
>> Jerry
>
> He's talking about zero-span on typical spectrum analyzers, which
> allows a time-domain view of the signal like an oscilloscope.
>
> I think it boils down to working a lot like an oscilloscope in that
> mode. I'm not completely sure what the question is in that regard.
He's probably too young to remember vertical- and horizontal hold
controls on TV sets.
To OP: the signal's amplitude is shown on the vertical axis, with a
sawtooth (sweep) waveform providing the effect of time on the horizontal
axis. For the signal to appear stationary on the display, the sweep time
must contain an integer number of periods of the displayed waveform. The
sync functions like a PLL to achieve that.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by Eric Jacobsen●October 23, 20082008-10-23
On Thu, 23 Oct 2008 10:02:33 -0400, Jerry Avins <jya@ieee.org> wrote:
>PARTICLEREDDY (STRAYDOG) wrote:
>> hi all,
>> small doubt..i was Spectrum analyzer..all along in place..where
>> i work.but..i was wondering..how..by providing external trigger..the
>> time domain (zero span signal) is stabilized and locked to external
>> trigger and its stable and not moving in the view screen..
>>
>> ofcourse..i will select..trigger option as external trigger...instead
>> of free run..
>>
>> can anyone..point to some literature or explain..the underlying events
>> happening..
>
>What instrument do you mean? It seems to me that you described an
>oscilloscope display.
>
>Jerry
He's talking about zero-span on typical spectrum analyzers, which
allows a time-domain view of the signal like an oscilloscope.
I think it boils down to working a lot like an oscilloscope in that
mode. I'm not completely sure what the question is in that regard.
Eric Jacobsen
Minister of Algorithms
Abineau Communications
http://www.ericjacobsen.org
Blog: http://www.dsprelated.com/blogs-1/hf/Eric_Jacobsen.php
Reply by Jerry Avins●October 23, 20082008-10-23
PARTICLEREDDY (STRAYDOG) wrote:
> hi all,
> small doubt..i was Spectrum analyzer..all along in place..where
> i work.but..i was wondering..how..by providing external trigger..the
> time domain (zero span signal) is stabilized and locked to external
> trigger and its stable and not moving in the view screen..
>
> ofcourse..i will select..trigger option as external trigger...instead
> of free run..
>
> can anyone..point to some literature or explain..the underlying events
> happening..
What instrument do you mean? It seems to me that you described an
oscilloscope display.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by PARTICLEREDDY (STRAYDOG)●October 23, 20082008-10-23
hi all,
small doubt..i was Spectrum analyzer..all along in place..where
i work.but..i was wondering..how..by providing external trigger..the
time domain (zero span signal) is stabilized and locked to external
trigger and its stable and not moving in the view screen..
ofcourse..i will select..trigger option as external trigger...instead
of free run..
can anyone..point to some literature or explain..the underlying events
happening..
thanks
particlereddy