You are looking at the waveform with a scope probe that presents a 10 meg ohm load to the pulse generator. What you need to do is use a 50 ohm cable to go from the generator to the scope input and include a 50 ohm through termination right at the scope. A real simple solution would be to use a BNC T with the center loaded with a 49.9 ohm resistor. Or just look for a 50 ohm through termination on ebay.
Regards
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----- Original Message -----
From: "lop pol via Groups.Io" <the_infinite_penguin@...>
To: <
[email protected]>
Sent: Sunday, June 17, 2018 9:47 PM
Subject: [TekScopes] 465 bad rise time
Hey guys. I have done a lot of work to this 465. I had initially planned on selling it to help me buy some plugins for my 7633. I decided I don't want to sell it and am keeping it. Today I checked its rise time with a pg506 fast rise. Both channel 1 and 2 closely resemble each other and they are not close to right. Before I start trying to calibrate this thing, does it look like there is some type of component issue left to fix? I am thinking since both channels are so alike there is something wrong besides just out of calibration. Thanks guys.
here are some pictures
/g/TekScopes/photo/59361/0?p=Name,,,20,1,0,0
/g/TekScopes/photo/59361/1?p=Name,,,20,1,0,0
