modified 6 years ago

Further scope investigation

00:36:30

Since I now figured out that my scope should actually measure 200MHz rather good, I now wanted to find out what the issue used to be.

See first post on this: http://everycircuit.com/circuit/5128890717306880

This was the result when I connected the ADF4351 directly to my scope with just a 50 ohm coax and used the scope on X1.

http://imgur.com/a/mh2FqcP

Now I removed all my cables at the ADF's output and just connected the probe, that was delivered with the scope, to the SMA connector and got this. I used it on X10. (The schematic in this post should match my probes specs) 

http://imgur.com/a/scMqCzU

At 40MHz the amplitudes of both measuring methods match pretty well.

So I think I figured out the issue and I'm pretty happy with it since I wanted to buy proper probes anyway.

Maybe this post helps anyone to figure out such a problem too or find inspiration.

As always, if I'm doing any stupid mistakes plz let me know.

published 6 years ago

hurz

6 years ago

i hope you have something like this to have a flat frequency response http://everycircuit.com/circuit/5732531459325952

ViolationMad

6 years ago

Well might be, I just simplified it a bit. Also those probes are such trash, that they might also be just a resistor and some coax...

hurz

6 years ago

yes, a good probe is an investment. The ones with the scope are mostly rubbish

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.