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4hv.org :: Forums :: General Science and Electronics
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Another dumb question - approximating frequency with oscilloscope.

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tarakan2
Tue Aug 05 2014, 07:26AM Print
tarakan2 Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

Is approximate Frequency of the signal =

(10^[Power of the Dial Setting] * Multiple on the Dial) / 2*[waveform length in centimeters]


Power of the dial setting as in x*10^-n = prefix*(x)
Centi n= 1
Centi n= 2
Milli n= 3
Micro n= 6
Nano n= 9
Pico n= 12

(or 1/10^-n)

So if I have a dial set to 100 microseconds / centimeter and the waveform takes about 1.5 centimeters on the screen,
then the input signal frequency is around 3333.3Hz?

Thank you.
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Patrick
Tue Aug 05 2014, 07:57AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
i think your complicating things.
typically were taught : Hz = 1/t


tarakan2 wrote ...

So if I have a dial set to 100 microseconds / centimeter and the waveform takes about 1.5 centimeters on the screen,
then the input signal frequency is around 3333.3Hz?

Thank you.

at 100 uS per cm then,
1.5cm x 100us = 150uS
so, 1 / 0.00015 S = 6666 Hz

others should cjheck im about to sleeeeeeeeeeeeeeeep



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Dr. Slack
Tue Aug 05 2014, 08:08AM
Dr. Slack Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
It's easier to take it a step at a time.

If the dial is set to 100uS/cm, and the waveform takes 1.5cms, then the period is about 150uS.

If the period is roughly 150uS, then the frequency is somewhere in the region of 7kHz.

Note that I've presented the answer to the number of decimal places appropriate for reading frequency off a scope.
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Patrick
Tue Aug 05 2014, 08:13AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
i believe there are only two sig figs so 6.6 khz ...
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Proud Mary
Sat Aug 09 2014, 10:45AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Hiya Tara,

don't forget you can build yourself a nifty 1MHz test oscillator for a couple of quid, so you can really see what is going on with your 'scope.

Stella
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