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Smith Chart Zoom???


scm325 2021/01/29 16:02

Just got my unit today, Very Impressed so far. I have used a lot of Anritsu VNA Masters, mainly a MS2034A for over ten years, and then an MS2038C for the last 3 years, all at work, so I'm very famailiar with VNA operation and use.

My question is with the above units, one can zoom in and out on Smith Charts usally in 10db steps, so dependin on the plot, if its very tight one can ZOOM IN for more detail (great way to charecterize loads, tighter the dot is aross the measured freq range, better the load), then if the result start going out side the displayed boundries you ZOOM OUT.

The Question is I thought i saw this capability in these unit....is it there and if so how does one get there.

Thanks.
Steve
KM4V

Siegfried Jackstien 2021/01/30 17:08

Select trace 3... Scale.. Scale/Div
Type in 0.2...and smith is zoomed x5
Type 0.1 and its zoomed x10

Am 30.01.2021 01:02 schrieb scm325 <Highpwr@Bellsouth.net>:

Siegfried Jackstien 2021/01/30 17:12

Correction.. Select trace 2
That is third trace
Dg9bfc sigi
Ps see example of a poty feed

Am 30.01.2021 17:08 schrieb Siegfried Jackstien <siegfried.jackstien@freenet.de>:

Siegfried Jackstien 2021/01/30 17:13

Am 30.01.2021 17:12 schrieb Siegfried.Jackstien@freenet.de:

Siegfried Jackstien 2021/01/30 17:23

Am 30.01.2021 17:12 schrieb Siegfried Jackstien <siegfried.jackstien@freenet.de>:

scm325 2021/01/30 13:19

Siegfried,

Excellent, and thank your reply explained and resolved my Smith Chart zoom issue, AND helped me understand the scale function in general.

Thank You Again & Best Wishes,

Steve
KM4V

Siegfried Jackstien 2021/01/30 18:38

scale seettings differ a bit depending what trace you select

in smith normal is x1 ... and zoom x5 is with scale set to 0.2/div

swr is 1:1 is at bottom (reference is 0 or lowest line in the chart) ...
can be set to 1 .. or 0.5 or whatever per division

return loss can be 6 or 10 or 20 db/ div (depending what you want to see
and how good your match is) ... normally 10/div is fine

trough loss can also be set to 1db per scale div or even lower (say you
wanna finetune a filter for lowest loss)

....

each trace can be scaled ... and can be set up or down (reference spot)

play around with it to get a good feeling what is doing what ...

after you have found your preferred settings ... click on "calibrate"
and save (without the need of recalibrating if you have done that before)

you can use (as an example) average set to x10 while calibrating (takes
a bit longer but has a smoother curve then) ... but for fast measure
save avg x1 in a memory slot (use slot 0 if you want those settings used
after a power cycle)

you also can set smith to be zoomed or not ...just save that in another
memory slot if you want a fast switch back and forth of zoomed unzoomed view

if you get used to ... change settings ... and use the memory slots for
callback of those settings its much easier to use the devicde

in fact its all about "practice" ... use it often and its gettijng
easier and easier

greetz sigi dg9bfc

Am 30.01.2021 um 18:19 schrieb scm325:

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