Hi Cliff, Yes, in my opinion the "below 10 kHz" problem is purely on the 7854 side, as my 7L5 displays CF correctly in both 7633 and 7104. I did not bother much with it as I simply got used to it, and

Hi Cliff, I wrote about a related problem in this message: https://groups.io/g/TekScopes/message/149400 I also have the same issues with my 7L5/7854 as you reported (improper reset and CF display belo

I live on the other side of the globe and never met any of you, but I highly appreciate the personal, human element in this group's discussions. That's what makes friends, and friendship is better tha

Strange that nobody responded, summer vacations? I was really hoping to hear about this, I currently don't have the 7S11/7T11 but I'm considering getting them. What I do have is a 7S12 with S-4 and S-

Well I suppose this sounds silly, but I just can't get over it. This thin metal sheet inside the handle is surely tough, high tensile strength steel, but somehow subjectively it doesn't nearly impress

Chinese copy of Agilent 82357B USB-GPIB adapter goes for $70-$80 on eBay/Aliexpress, I've been happily using it without a glitch for some time with my 7854. It can be used in NI software through NI-VI

Hi Max, You're welcome, my 7854 appears to be newer: TEK/7854,V79.1F2.00,8K In any case I believe there is something wrong with your unit #1, most probably in the Z-axis circuit/amplifier. Since you h

Hi Max, At first glance I can't help you much, but I'm curious. I have a late model 7854, during AVG it behaves much like your second unit - real time waveform update can be seen clearly (a very nice

Hi Albert, wrote: removed. Q55 provides the snap-off bias current and can safely be removed. With Q55 removed the S-52 Cert Signal Out was about +2 V and Offset had no effect. If my analysis is correc

Hi Albert, You're probably right, I didn't analyze the feedback/offset circuit in fine detail. My conclusion about the offset was mostly based on what I observed while probing around the head. My 7S12

Hi Ed, Did you try switching off digital storage? If there is a fault in it (and it's quite a complex circuit), it would interrupt the signal path. My unit was such a case (was working only with DS of

I think that offset-feedback loop is not affected by lack of sampling, so offset control is still functional (just as the input signal were always zero). Feedback signal enters the head at pins 2&B, a

Hi Albert, In my case (without the snap-off signal) the head sensitivity to input signal was zero. The explanation is in the structure of the strip line to which C52 and C54 are attached. This structu

Heh, I just fixed it, it's working now. While probing all components inside S-4, I found that the bottom lead of R62 was cold soldered (the one soldered to the gold plated PCB strip), it snapped off a

Hi Albert, of S901 "Correction Memory Switch", see page 2-5, is important. For now the best way is to set the switch in the rear (OFF) position (as long as you don't have a pulse generator head). > Ex

Hi Albert, thanks for your help and effort. all try with Readout turned off please. > I did, I uploaded a photo here: https://groups.io/g/TekScopes/photo/89504/0?p=Created,,,20,2,0,0 this was taken wi

That is trace goes upward when you rotate Offset clockwise. Albert. Yes it does. On the 500mV/div setting the range that I'm getting is -2.7div and +2.2div on the graticule. On higher settings I can g

conductor and the junction of diodes C and D? And also, so less important for your problem, the 50R input resistance (due to divider R3)? Yes, I can read +/-1.2V voltage drop from the SMA center to bo

Thank you all for your advice, I just tested the sampling gate of my S-4 and believe it's good. Since I don't have a curve tracer, I improvised one using a 7854, 7A26 and 7A22 driven by a triangle ram

Hi Everyone, This is my first and only piece of sampling equipment, and I can't get it to work. What I get is a flat trace with just some minor noise on it. I connected the same signal (10MHz <1Vpp) t