开云体育

You can smooth out the flat-top by adding a little series R from the emitter to the output cable connection. This will trade some edge speed for more civilized appearance afterward. Remember, nothing

True... but if this were the source of the ringing, then wouldn't I see substantially less ringing, and a corner closer to square, on the S-4 25 ps sampling head compared to the S-2 (75) or S-1 (350

Thank you folks for an interesting and informative discussion. Clearly, there is not a general consensus regarding whether or not negative feedback reduces noise. There seem to be many who believe

It might just be the math. You cannot get a perfectly flat top even with infinite bandwidth... Look up Gibbs Phenomena. Basically, the Fourier combination of sine waves to create a square wave will

Thanks nj902, I understand. But I read in the 492P manual that it can transmit the data relating to the waveform in ASCII format, perhaps with a suitable program on a PC they could be converted into a

That is true, but Bodnar's pulser is a full order of magnitude faster than mine (30-40 ps vs. 380) and I'm sure nothing is what it seems at that speed. Anyway, I may just stop here rather than drive

I don't have an answer, but I would note that the Leo Bodnar Fast Risetime Pulse Generator also has some ringing at the start of the flat top, and its circuit construction is extremely compact, so it

When Tektronix introduced the 492, it was an advance in technology to offer so much capability in such a small package. The 492P model includes a GPIB interface for remote control. The 492 platform

Any thoughts on what's causing the ring with the 2 ns period at the start of the flat top? Maybe the short but unavoidable length of exposed center conductor where the charge line connects?

I wanted to write 492P, it's not a day. --Cheers Attilio

oops, sorry. This is a 429P not a 492AP, I was wrong.

Your first post said the instrument is a 492AP. Which is it? They are quite different.

Thanks Robert, I have everything to view the 492P screen plot on PC, but I don't know how to start data transmission from the 492P. I have a Panasonic oscilloscope connected to the PC via the Prologix

Hi, From the KE5FX 7470.EXE manual: "7470.EXE is a Win32-based emulator for the HP 7470A plotter. It will acquire an HP-GL/2 plot and render it in a window. The plot can then be printed, viewed as an

Thierry, See if the Cherry microswitch is is opening and closing. That will do what you describe if it is not mounted right. This is pushed by the pin on the front knobs. The white spool is between

To clear things up, the types mentioned in question are X and Y caps. The X1 can replace an X2 and a Y1 can replace a Y2. The reverse of these is not recommended, e.g. X2 replacing an X1. Mark

The misattribution was due to the way groups.io quotes text, but I'm the one who wasn't paying attention, so I'll accept the blame. For the record, the quote actually came from Mark Vincent.

thank you Dan/Mark. nearly there... There was no reference voltage . I've therefore replaced U752 (LM741). This has restored the sweep on the interface board, AV, AU (holdoff) and can now see the

Thanks :) I stuffed it all into the 5 x 2-1/4 square Minibox, including a 6 ns semirigid charge line. Displayed 10-90 risetime is just under 400 ps on a 75 ps sampling head. Flat-top could be flatter

Hi all, I've just uploaded two screenshots: /g/TekScopes/photo/262075/4 /g/TekScopes/photo/262075/5 It's my PG506's (+) fast rise output directly coupled to a PM3340