True, Mark. It has been several decades since I have created or observed an eye diagram, after all.  I was thinking of how data patterns with long strings of ones or zeroes might not show the entire

Hello Mark, I had a 464 and mine had H.V. problems... so I know quite well this one. Well... There is no test that will give you absolute certainty that T1501 is in working order, besides seeing the

Uh, Dennis, that's Nickel, not Nickle.  A nickle is a kind of bird, and I have heard of people winning bets by asking the color of a nickle.  When people say, "silver", they lose the bet because the

Add one assumption to my statement: Assuming your data is self clocking with no clock available, has 2 or more states, transitions at fixed intervals,is random and has some sort of preamble that is

Hi Miguel, I would guess that around 1984 Mercury was banned in the US around that time. But I am pretty sure Tek used rechargeable Nickle Cadmium batteries in their scopes. Nickle Cadmium has always

Usually you want to trigger on the clock.  That way all the data transitions overlap and form the eye.  Eye closure top to bottom indicates noise, ringing, and other amplitude anomalies.  Eye

Hi John, Ok... So it seems there's a strong DC offset pushing/pulling the A Triggering pre-amplifier way out-of-range. There can be several causes to it. My own 464, for instance, had a defective FET

I don't know why this would happen, it's a mystery for you to figure out :). It might be because I'm pointing you in the wrong direction, and what's actually happening is e.g. that the trigger

can anyone advise me on a 464 ? there is no hv. checked all power supply voltages.they are ok.the hv oscillator is not running.i cant make any sense of the voltage readings i am getting on the

Yes it's definitely possible on TDS7xx. It's a bit better on the later versions (i.e. 7xxD vs 7xxA) because InstaVu was improved to include grading. Intensity is visible through color mapping. You

You really should have active data if you want a worst case eye diagram. Intersymbol interference, jitter and line reflections will vary depending on the data. Assuming your data has 2 or more states,

I took the quick and easy way: I harvested one from a recently died cd-player that happened to have a similar size line filter in it. It was only a few years old, so way newer than my 2215A.. :-) So

Hi Siggi, Thank you for the explanation. Two followup questions: 1) Why would the scope appear to pass test 05 when I manually run the diagnostics but fail on start-up? This probably doesn't

Could someone please post the model # for a replacement of the Schaffner line filter unit for a standard 120V North American powered Tek 2215a scope ? Would this new "mysterious" replacement line

InstaVu seems like the right place to start, but I don't know a way to trigger properly (on both edges). Has anyone done this on this vintage scope? Thanks Dan

Hi Fabio, I carried out the following test ..... While pressing the Trig View, press also the Beam Finder (you should see the trace either stuck near the top or the bottom of the screen). While

Hi Dennis, thanks for your answer, could be a modified rectifier board? http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/050-1841-00.pdf Regards Miguel -----Mensaje original----- De:

If the Mouser part is a TO-247 case, the thermal resistance, Θj-c, is the same. When you get it you should see a metal (tin plated copper) pad embedded on the backside. Should work just fine if

Hi John, No problem about the time... It's a relief for my mind to solve those puzzles. Some comments further down, just after your answers... Regards, Fabio Hmmm... Both things above together, may

Hey Stefan, This is typically because of leaking surface mount electrolytic capacitors on the A5 board. If you consult the archives, you’ll find plenty of information about this problem. Those