Products > Test Equipment
DIY Logic Analyzer Probe and Pods for Siglent (and LeCroy) scopes
oz2cpu:
Fantastic looks like you nailed it :-)
did you try to use the SKEW settings ?
with this you can trim the LA delay to match that analog channels
techneut:
I was looking for cables and came across a scart cable. In it are 6 small flexible coax cables 50 Ohm. Is it worth the trouble to strip this cable and use them or is it not any better than twisted pairs? I would probebly need to change the 120 Ohm resistor value?
oz2cpu:
scart coax is 75 ohm, so yes, all 120 ohm, needs to be 75
this way each side of the coax is terminated with 75, and you should expect as little as possible ringing, and better timing.
I prefer to use a high impedance as possible, twisted pair is about 120 ohm, and this way you load the signal source less,
that is also what you want.
oz2cpu:
LATEST NEWS : MY STOCK IS EMPTY.
I DO NOT PLAN TO MAKE AND SELL MORE.
ALTIUM AND GERBER FILES ARE NOW IN THE THINGIVERSE LINK.
MAKE PCB and 3D files for OWN private use is alowed.
MAKE and sell PCB or 3D files, or fully assembled product, ONLY alowed if the sale price ONLY cover actual expenses.
it is NOT alowed to modify this design and distribute any part of it as your own.
techneut:
--- Quote from: oz2cpu on May 14, 2021, 01:13:25 pm ---scart coax is 75 ohm, so yes, all 120 ohm, needs to be 75
this way each side of the coax is terminated with 75, and you should expect as little as possible ringing, and better timing.
I prefer to use a high impedance as possible, twisted pair is about 120 ohm, and this way you load the signal source less,
that is also what you want.
--- End quote ---
That is what I expected 75 Ohm but I used the TDR with a variable resistor at the end of the cable and it was 50 Ohm. For analog video (< 5MHz) it doesn't realy matter. The BNC's used in analog video are also 50 Ohms. Only with SDi (540 MHz and higher) came the 75 Ohm BNC.
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