Electronics > Projects, Designs, and Technical Stuff
Measuring sub 2Hz frequency with high accuracy
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bdunham7:

--- Quote from: ricko_uk on June 07, 2020, 06:47:32 pm ---Thank you bdunham7,

it does measure it if I put the entire waveform on the screen but as per my oy original post then the resolution is very low. I needed to measure it with a high precision (as high as possible, ideally 4 or more decimal digits).

--- End quote ---

OK, I thought you weren't even getting the two decimals.  The measurements in the menu are done with the on-screen information, so the precision is quite limited, I'm guessing you see something like 2.00 Hz, or even 2.0 Hz (which would be pretty crappy) and you want 2.0000.   It appears that neither of your instruments will give you what you want directly and you either have to use cursors, which will likely be no more precise, or some workaround like running your test signal into CH1 and your AWG into CH2 and then adjusting the AWG output to exactly overlap your test signal.  That should give you the precision you want.  That' s the best idea I've got.
ricko_uk:
Thank you bdunham7 :)
ejeffrey:

--- Quote from: ricko_uk on June 07, 2020, 03:50:17 pm ---Thank you bdunham7,
I just checked me Rigol MSO1104z and if the frequency is lower than 15Hz it just shows "< 15Hz". I assume because the internal counter overruns/rolls-over...

--- End quote ---

I would expect the counter in the signal generator would be better than that.  Have you tried to figure out why that was giving poor results?
ricko_uk:
The signal generator gives several decimal digits accuracy but had issues getting to trigger or give steady readins. The signal is very precise and stable but the readings were not. Now I managed to get the reading with enough accuracy.

Thank you all! :) :)
bdunham7:

--- Quote from: ejeffrey on June 07, 2020, 10:01:09 pm ---
--- Quote from: ricko_uk on June 07, 2020, 03:50:17 pm ---Thank you bdunham7,
I just checked me Rigol MSO1104z and if the frequency is lower than 15Hz it just shows "< 15Hz". I assume because the internal counter overruns/rolls-over...

--- End quote ---

I would expect the counter in the signal generator would be better than that.  Have you tried to figure out why that was giving poor results?

--- End quote ---

Add-on simple counters may lack features like noise reject and adjustable triggers that are necessary to get stable readings in some cases.  I was actually surprised shocked at how well the FY6900 handled it.
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