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Edited by OASJ2YSeeEhBQo1 at 2020-6-17 09:27
Still, I am not sure what you are trying to show with the pictures above. If you are trying to test the maximum bandwidth of the oscilloscope, I have an impression that you are doing it wrong.
As you did not give any detail of the setup and procedures you are using to do the measurements, I can only suppose.
The maximum output frequency of the HT6254BD's DDS is 25MHz (according to its manual), you are trying to output 60MHz, I think that is the cause of the deformation you are seeing. Try to use a function generator capable of output the frequencies you need.
Another method, is to measure the rising time of a step pulse signal (you will need a special step signal with a very fast edge rising rate, in the order of ps. Tip: you will need a special circuit for that, try to search for "fast edge pulse generator") and then calculate the BW with that number.
Also make sure that you are using correct probes and grounding techniches.
Some articles that may be of interest:
https://community.keysight.com/c ... -bandwidth-yourself
https://community.keysight.com/c ... -of-the-scope-probe
https://community.keysight.com/c ... width-of-your-probe
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Post time 2020-6-12 09:19:10
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