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Show us your square wave

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guenthert:

--- Quote from: Alfons on November 01, 2019, 02:13:56 pm ---I have just converted the TDS744a in a TDS784a, which was done without problems. The bandwidth has doubled. Here is a picture of the same signal as yesterday. You can see how a narrow bandwidth smoothes the signal.

--- End quote ---
  While fundamentally one can expect a signal sampled with higher sample rate to produce a trace which better reflects said signal, in the examples given, there are enough sample points using the lower sample rate to show those 'humps' (harmonics) seen in the second trace.  I rather think those are two different signals.  Perhaps insufficient grounding in one?

  Ah, strike that.  Somehow I read 'bandwidth' you wrote as 'sample rate' (I'm having my coffee now).  If indeed the bandwidth of the low pass filter on the input got risen, you'd expect the different traces you got.  Don't mind me then.

AVGresponding:




Sorry, couldn't resist   :-X

0culus:

--- Quote from: Alfons on November 01, 2019, 02:13:56 pm ---I have just converted the TDS744a in a TDS784a, which was done without problems. The bandwidth has doubled. Here is a picture of the same signal as yesterday. You can see how a narrow bandwidth smoothes the signal.

--- End quote ---

I have an ADF4351 based signal generator evaluation board, and it looks fairly similar to that on my 7104. Really fast edges (I beat it by constructing a Jim Williams pulse generator though) but generally very ugly even with proper termination.  :-//

Alfons:

--- Quote from: 0culus on November 01, 2019, 10:33:30 pm ---
--- Quote from: Alfons on November 01, 2019, 02:13:56 pm ---I have just converted the TDS744a in a TDS784a, which was done without problems. The bandwidth has doubled. Here is a picture of the same signal as yesterday. You can see how a narrow bandwidth smoothes the signal.

--- End quote ---

I have an ADF4351 based signal generator evaluation board, and it looks fairly similar to that on my 7104. Really fast edges (I beat it by constructing a Jim Williams pulse generator though) but generally very ugly even with proper termination.  :-//

--- End quote ---

It would be overkill for me to get me a generator that produces clean signals to about 1 Ghz. But you can use that to test equipment. That's how I got the part. With a little skill you can use it to repair and calibrate equipment, because after all, the frequency is relatively stable to 1 Ghz and the frequency is also relatively accurate. Otherwise, I would not know what to do with it, because RF is not my area.

0culus:
I originally bought the board because I needed a just over 3 GHz CW source that was juuust beyond what my 8664A could provide. I now have an 8672A 2-18 GHz signal generator, which obviously completely outperforms the eval board in virtually every relevant spec, especially phase noise.

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