Nobody can even guess whether the DSO is capable until you tell us what you are measuring and what you want to see.
Sure.
I'm trying to figure the cause of a computer that doesn't boot up and have been asked to check if for a logic pulse (and if present, how many pulses) on the chip enable (CE) pin of the booting ROM (27C010) in order to better trace the source of the problem.
If the frequency of the square wave is very high, it won't display well. It claims an analog bandwidth of 250 kHz so the square wave stream better be lower than about 25 kHz. Anything above that will show significant rounding until, at around 250 kHz, the square wave will look like a sine wave.
Then there is the voltage, the spec is 20V/div max and I assume (without a shred of proof) that there are 10 divisions. This would imply anything up to 200V peak would be acceptable. I doubt that but I don't work at those levels anyway. Around 5V for logic it should be fine.
If I'm not mistaken that's it: a normal 5V logic signal.
How long is the sample string you want to see. If you want to display 10 seconds of trace with 1kHz signal, it's going to be a mess.
There is a 1kHz 3.3V test signal on the scope (according to the docs) so you might want to play with that as you learn the controls.
Yes, I've tried that and I get a nice display of the waveform as I adjust the controls.
I don't think I fully understand the concept of a logic pulse, but an estimated guess (and of course the term gives it partly away): a very short voltage burst at either around +5V (logic high) or close to 0V (IIRC it might actually be anything below +2.5V or so) for a logic low.
In other words, similar to if I was to touch the probe to a constant +5V source, then quickly remove it again (which would be "a single pulse") but of course faster, then briefly touch the +5V source again (for a second pulse). Is this the basic concept?
With this in mind I think I may have figured something out: with the trigger mode to "normal" the display appears to stay at the last reading it took (i.e. the waveform is memorized) until a new reading is taken. Obviously I can't be counting the number of pulses if they're fractions of seconds apart, so I'm guessing the measurement display overlaying the waveform display is what I should look at?
It gives these readings:
- frequency
- cycle
- PW (I assume "pulse width", though I don't exactly know what it means)
- duty
Am I correct to assume the Sec/div control has to be at the scope's fastest (which is 10uS for this particular scope)? And the V/div control needs to be set a 5V (since we're expecting a normal logic signal)?
And I'm assuming the scope is to be set to DC (not AC or GND)?
I also have a probe attached to the scope (instead of using just the crocodile clip originally supplied with it). The GND clip is of course attached to GND from the power supply of the computer. The probe has a switch marked 1x and 10x. Is it correct to assume this is an attenuator function where 10x allows for measuring higher voltages?
Should it be set to 1x or 10x for this particular type of reading?