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NOTE: PLEASE DISREGARD THE PREVIOUS 2 POSTINGS, i HAD TO DELETE THEM AS THE LINK TO THE VIDEO WAS SOMEHOW COMING OUT WRONG. In the mean time I tried B-sweep test, again with signal being same 1KHz

Hi. It could be a simple bad interconnect between boards/cables etc.? I recall from my time at Tek, that some of those semi-gold plated "Harmonica" connectors would become intermittent over time. You

so frustrating to have the same problem again with it just sitting in my shop. I have a shop full of test equipment that sometimes I just cannot get to the bottom of the problem so it gets moved to

Hi Craig Great thanks. You know I did check at least some of the voltages according to the manual before I installed the replacement trigger board so It is probably a good idea to do it again before I

it won't trigger again just like before Larry, My thought is there probably is something up with the power supply. Ive worked on a bunch of these and the can caps seem to fail or get marginal on the

=== U421C pins of the bad scope measured with the good scope. Ozan

My 465M would not trigger a few months ago so I found a used trigger board and installed it and it worked fine. I haven't used it since then, and today, it won't trigger again just like before. It has

Just a heads up, wont be able to get to the scope until Sunday to do the additional testing with B-sweep. But if I am able to do so before I'll post results earlier. As somebody suggested the waveform

Ozan wrote: Ha, good idea! I think trigger level in 2247A is analog so, if A-sweep trigger level setting itself is the culprit, B-sweep will be OK. A and B triggering are independent, of course.

It may not give any immediate clues but you can try B-sweep with sine wave and see if the jump is there in B-trigger too. B side is very similar to A trigger. Since you have other scopes, you can feed

David, OP's above text precludes the presence of what you write with "If so, there might be an intermittent HF spike sometimes on the sine wave from the generator." because the "shifted" situation

BTW the server is still down so the posted video file link is still inaccessible. Also I am not able to receive any emails either, including from this list, but will keep checking the thread once or

Ozan: yes the jitter is still there when feeding a sine wave and trig mode set to NORM. Dave: Yes both sine and square wave signals are from the same generator which really has two independent outputs

Hi Alex. As you said there is no jitter when looking at and triggering from a square wave signal, I doubt that an overall PSU issue would be the cause. Tracing the trigger level/setpoint signal back

Perhaps the OP gets it and accepts it when you write that, Ozan, instead of just hunting for glitches on the DC power supply or suspecting "...the horizontal PLL losing its lock". Raymond

Your observation of sine vs square suggests trigger level jumps up/down. On a square wave edge is fast so even if trigger level moves horizontal jump will not noticeable. In "AUTO LVL" mode a

I will check tomorrow. Assume you ask if the jitter would stop in NORM trig mode? Or should I do the whole sine/square ch1/ch2 alternate testing as before once again?

Oops, I meant to instead write "MUR160", just in case.

If I understood correctly, given the suggestion that the horizontal jitter may be related to the DC power fed to the sweep circuit electronics, I am thinking that tracing the corresponding DC power

Unfortunately the server where the video was uploaded is temporarily down due to a fire at the datacenter on a UPS. I am hoping it will be back online later tomorrow.