Understanding Bandwidth - The #1 Test Gear Spec You Need to Know

[@KeysightLabs]

Thanks for watching! A couple clarifications: 1. When the input voltage is higher than the currently plotted voltage, the waveform will continue to move positive. When it's lower than the plotted voltage, the waveform will move negative. So, there will be a phase shift between the input voltage and the actually plotted waveform. The plotted waveform will also likely be distorted. 2. In the RF engineering world, bandwidth refers to a span of frequencies instead of 0 Hz -n Hz. Filtering and transmission techniques and are used to filter out unwanted frequencies. For example, cellular 4G runs on a carrier frequency of 2-8 GHz with channel bandwidths of 5-20 MHz.

[@Jameswen-electronics]

*Please scope i never have any and im not able to work with my electronics😢😢*

[@Whopperjaw.]

Excellent video! I learned something new! ...I now have the information I need to complete my space laser!

[@NLS87]

"my 1.5GHz oscilloscope" -> dies

[@tomb8430]

Very good explanation. Never properly understood this, now it's crystal clear.

[@KeysightLabs]

Glad it helped!

[@ameliabuns4058]

I wonder if it's possible to compensate for the effect with software?

[@Pawelr98]

I had a friend, who happily measured 100+MHz on 35MHz analog oscilloscope. With digital scopes there's a problem of ADC speed. With multi channel operation the possible frequency goes down. For analog it all depends on components and quality. My 250MHz analog has RF transistors on input, allowing for 500MHz signals to be seen. However my slow portable 5MHz analog will have trouble keeping up even at 8-9MHz, having sync problems(unless the signal is also connected to external sync input) and introducing plenty of distortion into the signal.

[@blitznoobz1457]

So this is like monkey see monkey do but the person copying ( Scope) is a slow person and can't keep up as fast ( due to the limit ) and it has to follow what the input does and I can think of it as lagging behind?

[@KeysightLabs]

Right, that's a good way to think about it

[@Surya9201]

Hi, in digital scopes we have ADC to measure voltage at every clock/ sampling rate. And for high speed Digitizer input voltage range is merely 2Vpp at 50ohm termination. Can we do same here by selecting small input range and feeding small voltage but higher frequency's. I understand rise time issues will be improved since now it has to swing few voltage/mV at high speed.

[@kruskotv1311]

Hes talking about test gear 101, is that some video ? And what about this "test gear 201" , is that a video or article ? Please link it

[@JimmyMakingitwork]

So we either need a super expensive high bandwidth scope to make sure we are covered, or we need to know in advance what it’s primary use will be to save money on tools. I feel a little smarter now.

[@Motorman2112]

Is 2:56 the same thing that happens when you put a capacitor across the signal line?

[@nickstanley5064]

Yes, because the capacitor and the output impedance of your source will form an RC low pass filter, filtering out higher frequency components and reduce the signal's rise time and limit the bandwidth of your system. How much will your signal be affected depends on the RC components.

[@Tutoelectro1]

Nice video David. Clear explanation!

[@KeysightLabs]

Thanks!

[@Jameswen-electronics]

*Please scope i never have any and im not able to work with my electronics😢😢*

[@yaghiyahbrenner8902]

Imagine the slew rate margins internally, how tight must be errh!, factor in temperature, drift over time and the expected performance of the instrument 20 years from now. Slew rate reminds me of the video: The paradox of the derivative | Essence of calculus, chapter 2

[@jafarhussain482]

I have a question .. When an oscilloscope has low bandwidth then what kind of signal is not displayed correctly A- sine wave B- SQUARE WAVE C- TRIANGULAR WAVE D- MODULATED Reply me fast

[@KeysightLabs]

In general, fast edges slow down and amplitudes are reduced as the signal exceeds the system bandwidth.

[@praveenkumarsingh1436]

Suppose u have sent 100 Mhz sine on oscilloscope and scope's bw is set to 100 Mhz.... Then sine will be displayed correctly with 30% attenuation. But if u have sent 100 Mhz square, then high frequency components of square (300Mhz, 500Mhz and so on) will be lost so square signal can't be represented correctly with only 100 mhz..

[@Alex-rv8gw]

what is the time domain and frequency domain ???

[@RobeenaShepherd]

I knew the rules, now I understand why the rules, thank you! 💝

[@volvo09]

Thanks for that, really helps when trying to understand scope specs, and show how useless some of these low end "chinese" scopes can be with super low bandwidth.

[@T-She-Go]

I love this. Thank you

[@beachboardfan9544]

WTS why have I been missing vids! CMON YT!

[@KeysightLabs]

Hit the alarm bell icon, and you'll get notifications for every video!

[@beachboardfan9544]

I did! ...months ago!

[@grhinson]

The easel is is not facing the camera and the editing could be tightened up, but everything else is good. At least your putting out help videos

[@KeysightLabs]

Thanks for the feedback, we're definitely working on tightening everything up!

[@SunilYadav-th1wb]

I don't like, the wastage of paper. Rest all good thanks man

[@ronaldschild157]

I'm glad to learn I'm not the only one feeling this way.

[@HamedAdefuwa]

Funny to hear him say why don't manufacturers just state a higher spec and limit the amplitude, that's literally what all the Chinese cheap manufacturers do lol.

[@AvenEngineer]

but does it have a FULL BRIDGE RECTIFIER?!?!?!?

[@Fabi33677]

you mean the MOTHER of ALL FULLEST BRIDGE RECTIFIER ?

[@Eagleoneradiogod]

He was only able to obtain a one way mono use single polarity partial bridge rectifier!

[@ronvaliant9337]

Electroboom

[@3dsmaxrocks699]

Check out my ELECTRIC guitar....

[@ovalwingnut]

👍😁 Thank you

[@B3.1425]

Amazing

[@HansDelbruck53]

My delivery driver's truck will do 100 Miles Per Hour because I live in America.

[@KeysightLabs]

#NextDayDelivery

[@fightocondria]

*Raises the question

[@kaustavsengupta8757]

*When you decided to pull out your big guns(1Ghz oscilloscope) to educate common masses onto bandwidth 101....😂😂😂

[@KeysightLabs]

Haha, yeah. I like to use the ones with bigger screens because they're easier to see on camera.

[@padmanabhaprasannasimha5385]

@@KeysightLabs that actually makes a lot of sense. I always used to think this is y'all just showing off neat gear..

[@johnavonvincentius1884]

hello?

[@johnavonvincentius1884]

bbbut i dont have a scope

[@pmcouto]

Keysight will be happy to sell you one! ;-)

[@RemcoStoutjesdijk]

So... you expect me to buy a 1.5 GHz scope, but you don't think I understand slew rate. WTF do I need a scope that fancy for?

[@KeysightLabs]

Nah, of course not! I like to use the big scope for video because it's a lot easier to see the screen.

[@johnvine5731]

There's a lot of background music consuming my bandwidth. Unlistenable.

[@davidmotley4207]

Wasting paper, wasted your video. Not too much content.

[@volvo09]

OMG, the paper! It could have been used for the the upcoming TPS report.