Not so sure. It claims 1MHz bandwidth. A square wave has a lot of significant Fourier content at high frequencies that make up it's shape. I used to have a 5 Mhz scope and it mangled the leading edges. Low bandwidth will "round" everything off.If you wouldn't ever want to look at more than 1 trace at a time that was up to a 100kHz square wave, you'd be OK with that.
More accurately, the scope USER has to know it's limitations.As Dirty Harry said, "A scope's just gotta know it's limitations".
I'm saying the bandwidth of any scope "clips off" any waveform whose frequency content exceeds the BW. Any part of a waveform that rises or falls quickly has the highest frequency content. Put a 10 KHz square wave (with sharp edges) into a 5 MHz scope and the edges will be rounded off. Fast rising voltage spikes are not shown on a DSO because it only samples twice during the entire event. That voltage spike gets reduced to a couple of dots on the screen.So you're basically saying that the DSO wasn't a 'real time' machine?
No, it's the limitation of the slew rate of input amps combined with slow sampling rates. Usually both are problems in early DSOs. It wasn't until the Tek "RealTime" displays and multi Ghz sampling rates were around that these signal impurities were captured, as noise is extremely wide spectrum.So you're talking about the propogation delay then.
No sir, it has nothing to do with propogation delay. I am talking about how any waveform can be expressed as a series of sine waves of varying frequencies and amplitudes in a Fourier series. If the amplifier stages of your scope only pass signals to 5MHz, all content above that is attenuated or eliminated alltogether. The waveform displayed is the true waveform minus the higher components. For a square wave, it will have rounded off leading and falling edges.So you're talking about the propogation delay then.
Fourier determined that any waveform that exists can be expressed as the sum of a series of sine waves which vary in amplitude and frequency. The first term is the "fundamental" which is the base frequency of the waveform. All additional terms are multiples of that frqeuency at reduced amplitudes.Has someone got a simple way of explaining this to me?
I am a bit simple.
|Thread starter||Similar threads||Forum||Replies||Date|
|Digital Scope Question||Test & Measurement||2|
|Capturing a Frequency Sweep on a Digital Scope||Test & Measurement||18|
|W||Digital 'Scope Single shot problems with long time scale?||General Electronics Chat||5|
|Cheap digital/USB scope...||Digital Design||7|
|Digital Scope||General Electronics Chat||51|
by Jake Hertz
by Jake Hertz