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Personally I'd replace C911: 22uF 15V tant bead on a 13V PSU rail, diagram 17 (not the PSU diagram!), and IIRC there are a couple of others on that rail, hidden on the other diagrams 7, 9, 11,

In switcher parlence, the "start up" capacitor is called the bootstrap capacitor because the supply picks itself up by its bootstraps. It is often charged by using a high wattage resistor connected

Switching supplies can be a problem when they fail. I recently had a Agilent VXI E4808A chassis that the main power supply failed, at least its 12 volts out did. That power supply is huge with a

SMD electrolytic capacitors are a tricky problem in several ways: First, they are easily damaged by the heat of the reflow oven, and solvents that may be used in cleaning flux,... though

Does anyone know how to remove the complete sampler block from the printed circuit board? I ask since I'd like to replace the channel select switches. The solder lips are hidden between sampler block

I have to agree with Chuck. Most test equipment with imbedded/integrated switchers are going to be very difficult to qualify parts if working. Their functionality can be extremely subtle. Blanket

Hmmm...? Did he die-bond, wire-bond, and package the FPGA or just solder it onto the board?? Not so impressive if it's the latter.? Still, the link to the website shows microwave devices being

My take on this after replacing thousands of surface mount electrolytic capacitors is replace them all when you get a new to you device that is more than ten or so years old. Switchers are harder on

I think I figured out why the calibrator rise time measurement doesn't read to spec. I warmed up the 11810 for about 40 minutes to do the Enhanced Accuracy adjustments. That seemed to go fine except

Replace Rifa mains interference suppression delayed action smoke generators on sight; if there is any sign of cracking in the transparent case, don't even turn it on. Where there are tantalum beads

Tough question. Yes, switching supplies are inherently harder on components than linear, but they also use much better parts. And they are more likely to be designed using math, rather than rules of

I have a few questions about power supplies and would like some opinions. Are switching powers supplies inherently harder on components than linear power supplies? If you picked up a 70's-80's

Hi Reginald, It is in the archives: /g/TekScopes/topic/7659008#141241 Enjoy. Egge Siert

Because there is a mismatch between the high plate resistance of the output pentodes or tetrodes (about 4.5k-ohms in push pull) and the loudspeaker. The impedance transformation goes as the square

Gentlemen... have a look here: /g/TekScopes/message/155394?p=,,,20,0,0,0::Created,,egge+siert,20,2,0,30465052 Albert

Through the tube era and the discrete solid state era professional balanced audio lines in radio and recording studios were also impedance matched at 600 ohms (earlier 500 ohms) because they were

The user manual I quoted has a revision date of May 1989. The August 1988 service manual states the calibrator is < 35 ps. The February 1989 revision page states the same rise time. As I noted

Thanks Craig... so, if I were to summarize what you wrote, at such short distances, there's really no opportunity for a reflected signal to go out of phase with the incident signal? In watching the

They must have changed the cal output circuitry on the later models.

It is to do with the frequency range. As soon as the length of