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 Subject :Question: How to read frequenct off FFT plot?.. 2017-07-04 03:54:22 
Statik
Joined: 2017-06-08 07:06:24
Posts: 4
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Hi all,

My Xprotolab Plain arrived today and I have the XScope software running on Linux Mint 18.1 flawlessly. I am wondering how one reads the frequency off the FFT plot? The manual mentions that FFT is the only way to do a frequency read on the analog inputs, so, how do you get the numbers?

 

Thanks!

Statik

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 Subject :Re:Question: How to read frequenct off FFT plot?.. 2017-07-14 06:55:39 
Statik
Joined: 2017-06-08 07:06:24
Posts: 4
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For anyone who is wondering about this, here is what I have figured out:

The FFT frequency span AND the AWG sweep function ranges are both set by the current timescale of the oscilloscope. I made the following chart during testing:

Wavegen                                    FFT Dispay             
time/div     Range Shown       Min prod    Max prod     f/div        f range     f/point
8us/div            -             000000      125000      125000       1000000     7812.5
16us/div     000000-996030       000000      125000       62500        500000     3906.25
32us/div     000000-498015       000000      125000       31250        250000     1953.125
64us/div     000000-249007       000000      125000       15625        125000      976.5625
128us/div    000000-124440       000000       62220        7777.5       62220      486.09375
256us/div    000000- 62220       000000       31110        3888.75      31110      243.046875
500us/div    000000- 31110       000000       16000        2000         16000      125
1ms/div      000000- 15937.5     000000        7968.75     996.09375     8000       62.255859375
2ms/div      000000-  7968.75    000000        4000        500           4000       31.25
5ms/div      000000-  3984.38    000000        1600        200           1600       12.5
10ms/div     000000-  1593.75    000000         800        100            800        6.25
HALF DISPLAY (4 divs only, 32 points per div)
20ms/div     000000-  1593.75    000000         800        200            800        6.25
50ms/div     000000-   796.875   000000         320         80            320        2.5
0.1s/div     000000-   318.75    000000         ??          40            160        1.25
0.2s/div     000000-   159.375   000000         79.05       20             80        0.625
0.5s/div     000000-    79.6875  000000         31.45        8             32        0.25
1s/div       000000-    31.875   000000         15.9375      4             16        0.125
2s/div       000000-    15.9375  000000                                     8
5s/div       000000-     7.905   000000                                     3.2
10s/div      000000-     3.1875  000000
20s/div      000000-     1.53    000000
50s/div      000000-     0.765   000000

 

If you look at the chart in a monospace font, it looks ok

 

Statik

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