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Argh! When in doubt, believe the Tek manual. I read that a 2 ohm load was sufficient, resulting in 2.5A draw. Wrong. Added a second 2 ohm on the options line (because the fusing on the 2 exposed +5VD

The inner and outer parts of the knob come off together after removing the setscrew.? Under the knob, the pot itself (and an indexing washer) is held in place with a nut. Bob Weiss

Thank you for the replies. I am away from the lab until Monday afternoon. But I am almost sure that the signal at the emitter of Q310 is correct. Roger

I need to remove the delay time knob and pot from a 465. Getting the inner knob off looks easy (as soon as the .050" Allen bit gets here from Amazon). How do I remove the outer part of the knob, and

A further note on this - Jared, you're spot on with your observation on the color mismatch, and such a pertinent point to make. I assume, as LEDs are pretty "narrowband" light emitting devices, the

I agree checking pin 7 of U350 is a good idea. That said pin 1 of U350A is the output of a unity gain amplifier summing in a DC voltage and should not have any steps. It should reflect the same DC

It is absolutely important to do CAL 06! You should be able to see the flaws on any high speed square wave input. If you have a PG506, it will definitely show the flaws. You can get most of the way

Hi Nigel, In Test 02, all of the error codes listed are unique orthogonal values. I don't recall what happens if more than one switch is stuck, but I am pretty sure that the scanning matrix used for

The step generator looks OK, the step amplifier has a problem. Take some more measurements at U350 pins 1 and 7. Are there more steps present there?

Dear All, I am struggling with this unit for some time. The waveform at TP305 is correct, according to the manual. However I can not obtain more than 5 steps at TP-306. I have checked the voltage at

Rogerio O <rodd414@...> added the album Tek 577 unable to display more than 5 steps ( /g/TekScopes2/album?id=279289 ) : The waveform at TP305 is fine, but when I turn the knob

I guess my issue was not appreciating the mix of digital values and analog values, something that would never have occured to me; my brain thinks in either one *or* the other. Just for the hell of it

I guess my next question is.... is it worth re-doing CAL 06 using the equipment that I do have rather than accepting nominal values? In the absence of a TD Pulser, I have the following TM50x modules:-

In the digital world, you can have all sort of variables.? Bytes (8 bit values), words (can be 16 bit values), etc... Much of the vocabulary depends on the underlying processor. True and false are

Hi Nigel, Thanks for coming back on this. Chuck being Chuck, his explanation was more extensive and clearer than my rather terse remarks. It illustrates exactly what you write as regards wording of a

Apologies if I've missed the point there; I have to say that despite your inputs and Chuck's it never actually occured to me *precisely* what was written in the specs. It did not at any time occur to

Having found no one to respond with experience with this problem, I've forged on and think have found the bad components. For the sake of anyone else who has a TDS5xx, 6xx, or 7xx with a similar power

Hi Nigel, The format for these messages is well-documented (SM) and the occurrence of the "03" value has been included in many messages in this and its sister group over time. As an example, I

Sorry, got dragged into something else, back on this now. I know about the cap error on the schematics, haven't replaced those 2. Again, it works if the +5VD feedback input to the regulator board is

We have reached a point in time where the tunnel diodes of old are slower than ordinary SMD logic and comparator parts. Leo Bodner has available a pulser that easily exceeds the rise time specs needed