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Show us your square wave

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taydin:
10 MHz clock output from my agilent pattern generator, measured directly at the clock pod with the spring ground lead that wraps around probe tip:

Physikfan:
Here are square waves 32 MHz, 300 MHz and 2.6 GHz of a HP8133A
measured by a Tektronix TDS820, 6 GHz oscilloscope with 44 ps rise time:

Square wave 32 MHz of the HP8133A, x-axis 5ns/div, y-axis 200mV/div:


Square wave 300 MHz of the HP8133A, x-axis 500ps/div, y-axis 200mV/div:


Square wave 2.6 GHz of the HP8133A, x-axis 100ps/div, y-axis 200mV/div:


The rise time displayed in the last image is about 60 ps

HighVoltage:
I just came across this old Tektronix video from 1961, explaining really nicely about the square wave.
This might be a real good video for the young players...
The Square Wave 1961

Tomorokoshi:
That's not a square wave...

That's a square wave.

gf:
A 10MHz square wave from the built-in DDS of my Hantek 6074BD USB oscilloscope, displayed on the same oscilloscope. Directly connected with a coax cable, with external 50Ohm terminator at the scope. The DDS is specified DC~25MHz, using a DAC clock of 200 MHz. The rise time approximately reflects the 25MHz bandwidth limit of the function generator. All in all not spectacular.

The 2nd image shows the same same signal, but at a low amplitude of 10mV. The apparent ripple can hardly be overlooked.  A FFT from this signal shows a decent peak at 200MHz, so I'm pretty confident that we see the DDS clock, leaking through to the signal output :( In reality, the ripple amplitude is likely even higher, since the scope's analog bandwidth is only 70MHz.

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