Electronics > Beginners

Rogol 1054Z actual bandwidth

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Mechatrommer:

--- Quote from: rhb on December 20, 2017, 12:49:27 am ---How about a screen shot of a sweep generator feeding a "hacked" scope? Has anyone posted that?

--- End quote ---



--- Quote from: xrunner on December 20, 2017, 07:03:46 pm ---But certainly the scope can easily display signals in excess of 500 MHz.

--- End quote ---
no, beyond 500MHz, you will see aliased signal...

xrunner:

--- Quote from: Mechatrommer on December 21, 2017, 07:23:05 am ---no, beyond 500MHz, you will see aliased signal...

--- End quote ---

Yes, if you don't care about amplitude or frequency accuracy. 900 MHz signal shown below, is displayed quite nicely. The amplitude and frequency you would measure with the scope will be wrong, but that's not the point.

scopeman:
Hello,

You should re-run this test with a known good 50 ohm feed through termination and start with a 50KHz signal with six divisions of
signal and increase the frequency to the point where you have 4.2 divisions of signal and repeat this for each attenuation setting to get a better idea of what the bandwidth of the scope itself is.

Sam
"scopeman"

Mechatrommer:

--- Quote from: xrunner on December 21, 2017, 01:38:34 pm ---
--- Quote from: Mechatrommer on December 21, 2017, 07:23:05 am ---no, beyond 500MHz, you will see aliased signal...

--- End quote ---
900 MHz signal shown below, is displayed quite nicely.

--- End quote ---
thats called 100MHz garbage


--- Quote from: xrunner on December 21, 2017, 01:38:34 pm ---The amplitude and frequency you would measure with the scope will be wrong, but that's not the point.

--- End quote ---
if the point is try to make out something from garbage, then yes i get your point.

xrunner:

--- Quote from: Mechatrommer on December 21, 2017, 03:48:07 pm ---if the point is try to make out something from garbage, then yes i get your point.

--- End quote ---

You aren't understanding the point I'm making. It's not garbage - it's a signal, it's useful information. If you want to trace a signal on a board to see if it exists then it's just fine for that above ~130 MHz. The signal is very easy to view on the DS1054Z hundreds of MHz higher than it's bandwidth limit (which is simply the -3dB point - not where it completely stops working).  :-//

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