Measuring Pulse width modulation PWM - Electronic Circuits Projects Diagrams Free

walters · 9th June 2005, 12:53 AM

How do i measure Pulse width Modulation (PWM) ?
with a oscilloscope?

How do i measure the Duty Cycle of the PWM?
with a oscilloscope?

How do i measure the Pulse width?
with a oscilloscope?

How do i measure the Time constant?
with a oscilloscope?

How do i measure the rise time and fall time?
with a oscilloscope?

how to Measure the Period and frequency of the PWM?
with a oscilloscope?

Russlk · 9th June 2005, 01:01 AM

You answered your own question, so what is your question?

walters · 9th June 2005, 01:06 AM

No i mean how do i do it step by step i don't know what to look for
and how to do it

I know i need to use the oscilloscope but i don't know how to measure
this stuff step by step process can your please help me out?

Russlk · 9th June 2005, 01:34 AM

The oscilloscope has two connections: the ground clip and the probe. connect the clip to ground and the probe to the circuit. There is a verticle position control, set it so the wave form is visible. There is also a horizontal position control, set it so the waveform starts at the left. Set the sweep control to expand the waveform so it suits you. There is also some trigger controls. Set it on auto to begin with. Later, you can try other settings and twiddle with the sync or level control. Has this helped?

walters · 9th June 2005, 01:56 AM

Thanks yes

but im talking more about how to Count the gradules and do formulas
to get the rise time,pulse width,how to actually measure this stuff
that i listed. Have to look at the PWM waveform on the oscilloscope
and count the gradules and look at the time settings and do some
formulas and stuff i don't know how to do this stuff please help me ?

walters · 9th June 2005, 01:58 AM

How do i measure Pulse width Modulation (PWM) ?

How do i count the gradules and what formulas do i need to
Measure this on the oscilloscope?

How do i measure the Duty Cycle of the PWM?
with a oscilloscope?

How do i count the gradules and what formulas do i need to
Measure this on the oscilloscope?

How do i measure the Pulse width?
with a oscilloscope?

How do i count the gradules and what formulas do i need to
Measure this on the oscilloscope?

How do i measure the Time constant?
with a oscilloscope?

How do i count the gradules and what formulas do i need to
Measure this on the oscilloscope?

How do i measure the rise time and fall time?
with a oscilloscope?

How do i count the gradules and what formulas do i need to
Measure this on the oscilloscope?

how to Measure the Period and frequency of the PWM?
with a oscilloscope?

How do i count the gradules and what formulas do i need to
Measure this on the oscilloscope?

zachtheterrible · 9th June 2005, 05:30 AM

http://www.electro-tech-online.com/viewtopic.php?t=240

Hey walters, there is a whole bit on PWM in this theory article with formulas and explanations.

Styx · 9th June 2005, 07:26 AM

HEY walters
Whats with being RUDE!!!!11111one!!!!!

repeating the same question twice and equally within the question repeating multiple time what you want!

It sounds like the real problem is how to use a scope since calculation of duty cycle is just

Ton/Tperiod * 100

Thus if you can get the squarewave on the scope you can then measure the period and also hte time that is is HIGH (or LOW dependant on what you want)

--EDIT--

looking over your question's again it is looking more and more like "how to use a scope". It would really help if you ask the right question

Take the "how do I measure rise and fall time". All that is is changing the timebase of the scope so you can see the slew rate of the signal and measure the time for it to go from 10% of the level to 90% of the level

walters · 9th June 2005, 07:51 AM

Sorry if i was rude i didn't mean it to come off like that if it did

http://www.electro-tech-online.com/viewtopic.php?t=240

I just copied this ocilloscope page and the color yellow for the oscilloscope
lines didn't print can you guys help me try to print the oscilloscope waveforms on this hyperlink its such a really good page on oscilloscopes
but its painted in yellow

Styx · 9th June 2005, 07:56 AM

best bet is to save the page as a HTML file, this will d/l all the piccies to encapsolate the webpage.

The open in yr favoirte image editor (I would recomend GIMP) and do what you think best to improve the situation

I would recommend remving the GRAY background and changing YELLOW for a darker colour

walters · 9th June 2005, 07:59 AM

That seems really hard to do but thanks for the information

Styx · 9th June 2005, 08:10 AM

give me 5min

Styx · 9th June 2005, 08:33 AM

here you go

walters · 9th June 2005, 08:39 AM

I clicked on the download hyperlink but it doesn't do anything
does it work for you ?

Styx · 9th June 2005, 08:41 AM

yes but here is a corrected one.

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9th June 2005, 12:53 AM	(permalink)
walters	Measuring Pulse width modulation PWM How do i measure Pulse width Modulation (PWM) ? with a oscilloscope? How do i measure the Duty Cycle of the PWM? with a oscilloscope? How do i measure the Pulse width? with a oscilloscope? How do i measure the Time constant? with a oscilloscope? How do i measure the rise time and fall time? with a oscilloscope? how to Measure the Period and frequency of the PWM? with a oscilloscope?

9th June 2005, 01:01 AM	(permalink)
Russlk	You answered your own question, so what is your question? __________________ see my website: www.geocities.com/russlk

9th June 2005, 01:06 AM	(permalink)
walters	No i mean how do i do it step by step i don't know what to look for and how to do it I know i need to use the oscilloscope but i don't know how to measure this stuff step by step process can your please help me out?

9th June 2005, 01:34 AM	(permalink)
Russlk	The oscilloscope has two connections: the ground clip and the probe. connect the clip to ground and the probe to the circuit. There is a verticle position control, set it so the wave form is visible. There is also a horizontal position control, set it so the waveform starts at the left. Set the sweep control to expand the waveform so it suits you. There is also some trigger controls. Set it on auto to begin with. Later, you can try other settings and twiddle with the sync or level control. Has this helped? __________________ see my website: www.geocities.com/russlk

9th June 2005, 01:56 AM	(permalink)
walters	Thanks yes but im talking more about how to Count the gradules and do formulas to get the rise time,pulse width,how to actually measure this stuff that i listed. Have to look at the PWM waveform on the oscilloscope and count the gradules and look at the time settings and do some formulas and stuff i don't know how to do this stuff please help me ?

9th June 2005, 01:58 AM	(permalink)
walters	How do i measure Pulse width Modulation (PWM) ? How do i count the gradules and what formulas do i need to Measure this on the oscilloscope? How do i measure the Duty Cycle of the PWM? with a oscilloscope? How do i count the gradules and what formulas do i need to Measure this on the oscilloscope? How do i measure the Pulse width? with a oscilloscope? How do i count the gradules and what formulas do i need to Measure this on the oscilloscope? How do i measure the Time constant? with a oscilloscope? How do i count the gradules and what formulas do i need to Measure this on the oscilloscope? How do i measure the rise time and fall time? with a oscilloscope? How do i count the gradules and what formulas do i need to Measure this on the oscilloscope? how to Measure the Period and frequency of the PWM? with a oscilloscope? How do i count the gradules and what formulas do i need to Measure this on the oscilloscope?

9th June 2005, 05:30 AM	(permalink)
zachtheterrible	http://www.electro-tech-online.com/viewtopic.php?t=240 Hey walters, there is a whole bit on PWM in this theory article with formulas and explanations. __________________ I'm no electronics god, i just talk too much.

9th June 2005, 07:26 AM	(permalink)
Styx	HEY walters Whats with being RUDE!!!!11111one!!!!! repeating the same question twice and equally within the question repeating multiple time what you want! It sounds like the real problem is how to use a scope since calculation of duty cycle is just Ton/Tperiod * 100 Thus if you can get the squarewave on the scope you can then measure the period and also hte time that is is HIGH (or LOW dependant on what you want) --EDIT-- looking over your question's again it is looking more and more like "how to use a scope". It would really help if you ask the right question Take the "how do I measure rise and fall time". All that is is changing the timebase of the scope so you can see the slew rate of the signal and measure the time for it to go from 10% of the level to 90% of the level __________________ Nothing is impossible. Once a problem is realised, the rest is just details

9th June 2005, 07:51 AM	(permalink)
walters	Sorry if i was rude i didn't mean it to come off like that if it did http://www.electro-tech-online.com/viewtopic.php?t=240 I just copied this ocilloscope page and the color yellow for the oscilloscope lines didn't print can you guys help me try to print the oscilloscope waveforms on this hyperlink its such a really good page on oscilloscopes but its painted in yellow

9th June 2005, 07:56 AM	(permalink)
Styx	best bet is to save the page as a HTML file, this will d/l all the piccies to encapsolate the webpage. The open in yr favoirte image editor (I would recomend GIMP) and do what you think best to improve the situation I would recommend remving the GRAY background and changing YELLOW for a darker colour __________________ Nothing is impossible. Once a problem is realised, the rest is just details

9th June 2005, 07:59 AM	(permalink)
walters	That seems really hard to do but thanks for the information

9th June 2005, 08:10 AM	(permalink)
Styx	give me 5min __________________ Nothing is impossible. Once a problem is realised, the rest is just details

9th June 2005, 08:39 AM	(permalink)
walters	I clicked on the download hyperlink but it doesn't do anything does it work for you ?