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https://youtu.be/pZ3s524OqTo Here is a odd thing I observing with B gate. Is this normal? Basically I expect the pulse to be shortest at 1nS and gradually widen. What happens here it basically goes in

Here is my attempt to explain in a real-world example the concepts of negative feedback and whether or not it lowers noise. The is for my buddy Keith. I came up with a simple real-world example of

B cannot rotate any further, it's rock solid against lock.

https://photos.app.goo.gl/rb7PqN5fkT6wTV9y5 I can replicate your picture at free running BNC cables 50Ohm termination

If the B-switch setting is faster than the B-knob indicates and the switch is mechanically blocked beyond the 1ns/div setting, it wouldn't be possible to set the B-speed switch to indicate 1ns/div. In

Hi Ondrej, Videos are very useful. I was surprised sweep and gate signals are not aligned but I think you are using different probes for each. Using a BNC cable for all of them will eliminate any

Probably, didn't check that. You probably run against end points. I didn't check any further. You obviously know what you're doing... Raymond

Wouldn't it correct itself at max and min setting? Both my shafts A and B can move from 0.5second to 1nS and no further and neither can rotate freely all the way around. There is a locking mechanism

As? a non-EE, maybe my take on this could be useful, because the OP was looking for a non-technical analogy or explanation. But it should still be accurate. The kids going into the house example does

Sorry to insist and no idea whether it matches any of your other symptoms but on my 485, it's no problem repositioning the knob on its shaft so B runs 10x as fast as A while A and B knobs are

re: Negative Feedback example, etc. Folks tell me that a gentle answer turns away wrath, so I hope this is a gentle reply. I mean it in that spirit. Tom, with respect to your criticism of my example,

Hi, It good you asked but I made sure it's in defined known position. The time base knob cannot be inserted in any other way. It's all locked

Both marked 820 ohms (grey-red-brown); initial measure in circuit R155 real value 1053 ohms (same value when removed), R290 real value 832 ohms and they look like 0.5W (if not more). Now the two have

Thanks everyone for the very interesting contributions. I have one more question about the feedback/noise debacle. Without feedback we have less linearity, therefore the original signal comes with a

I thank everyone for their help. No, it's my mistake, it's "A2 board", not A3: C1274 and C1291. Tek "2465" should not have C1292.

I'm also planning to recap my 2465 (plain vanilla, not -A or -B) as some RIFA's have already exploded, so if Giorgio or someone else puts together an up-to-date list could it please be posted here in

Ignorant question: On the video, I see you are missing some knobs, like the one for Holdoff. Are you sure that you have set that to minimum and others correctly as well and what's more: Are you sure

https://youtu.be/IPcyfDF65oU Here are the observations on the A sweep. Note the difference between free running and triggered

Giorgio, I may have TDK/Epcos B57238S809M 16 mm 8R 5,5A , solded 3 euro, or B57153S0150M000, 15R, 1.8 A, possible 2 in // for the current, my supplier gives 2 to 3 weeks (to be realy verified...)

Your observations in the video look OK for B sweep: 1) There is no change in B sweep in 1n/div and 2n/div settings. 2x is handled by the horizontal amp for 2n -> 1n setting. 2) Delay changing B gate