Products > Test Equipment
Using (and living with) Siglent SDS1000X-E Series Oscilloscopes
tautech:
--- Quote from: skempf on July 15, 2021, 03:49:40 pm ---I don't have a 50Ω terminator, so I'm just using a probe. The FG (1032x) is set to 1MHz square wave, 50% duty, 1Vpp. Is this what one would expect to read on the scope?
--- End quote ---
Precisely what you expect without 50 Ohm termination.
Risetime meets and betters the 7ns spec and the overshoot is the result mismatched termination on the SDG which BTW always has a 50 Ohm source impedance.
bdunham7:
--- Quote from: tautech on July 15, 2021, 08:32:01 pm ---Precisely what you expect without 50 Ohm termination.
Risetime meets and betters the 7ns spec and the overshoot is the result mismatched termination on the SDG which BTW always has a 50 Ohm source impedance.
--- End quote ---
Where is the mismatch???
tautech:
--- Quote from: bdunham7 on July 16, 2021, 01:44:10 am ---
--- Quote from: tautech on July 15, 2021, 08:32:01 pm ---Precisely what you expect without 50 Ohm termination.
Risetime meets and betters the 7ns spec and the overshoot is the result mismatched termination on the SDG which BTW always has a 50 Ohm source impedance.
--- End quote ---
Where is the mismatch???
--- End quote ---
50 Ohm source to 10x probe.
bdunham7:
--- Quote from: tautech on July 16, 2021, 01:56:36 am ---
--- Quote from: bdunham7 on July 16, 2021, 01:44:10 am ---
--- Quote from: tautech on July 15, 2021, 08:32:01 pm ---Precisely what you expect without 50 Ohm termination.
Risetime meets and betters the 7ns spec and the overshoot is the result mismatched termination on the SDG which BTW always has a 50 Ohm source impedance.
--- End quote ---
Where is the mismatch???
--- End quote ---
50 Ohm source to 10x probe.
--- End quote ---
The source is it's own termination, there's no need to add another when there's no transmission line. I don't know the exact distance between the 50R pad in the SDG and the end of the BNC connector, but λ/4 would be in the GHz range for the likely distances of a few cm. You can add a 50R pass-thru to make it a 25R output if you like, but there's still a distance between that 50R and the terminators BNC connector....
tautech:
Knock yourself out looking at properly terminated sources for square waves here:
https://www.eevblog.com/forum/testgear/show-us-your-square-wave/
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