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Variacs are tapped autotransformers. No isolation. You can get an assembly that combines a variac with an isolation transformer. Some companies make a device specifically for checking leakage and

In general, no. A Variac is just a primary with an adjustable tap. Variacs with isolation exist, having their adjustable tap on a secondary winding. Raymond

/g/TekScopes/album?id=86536&p=Name,,,20,1,0,0 Updates to the photo gallery, probing the base of the 177 test fixtures reveals small parasitic spikes, I believe this is what is causing

Interesting information Brian. I have often wondered if a Variac would provide isolation also. I have never checked mine I probably should. Regards John

I was only answering to the comment about isolation transformers. If any user gets one then I hope they can check them out to be sure that they are safe instead of expecting it to work & getting

And if you do get a 2ps rise pulse generator how do you check that that is up to its spec? Roger

Thank you for the additional information. I was curious if it would be of any interesting use when I came across it by chance on ebay. I do not own any TDS series scope and upon better understanding

Brian, Let's not confuse the OP. He has a 'scope with a HV (mains switching power supply) part that is galvanically connected to the mains and a LV part that is under normal conditions separated from

With difficulty. I believe there's a method involving three sampling heads looking at each other's kickout pulses and some maths which can be used to evaluate their performance. The SD-24's pulse

John, Great find! Thanks for sharing. I’m looking forward to seeing this! https://youtu.be/3Co8Z8BQgWc A hoard of never-developed film from the Apollo 11 mission was unearthed, some of it in 70mm.

Tek content begins around 8:58. Specifically, this is part 7 of CuriousMarc's series on restoring an Apollo Guidance Computer, but the whole video (and whole series) is great. You really feel like

Debugging I2C data streams, FPGA outputs, video data outputs from graphics chips. Have a CPLD standalone board that takes apart I2C communications and drives an HP logic analyzer. Goes from time to

Logic analyzers are very useful, but somewhat limited in what they do. They really were needed in the times of 8 and 16 bit microprocessors, and are less useful for microcontrollers. However, since

*Re: Isolation Transformers* When using an isolation transformer for troubleshooting you do not want an earth being connected through. The whole idea is to break any reference between earth & the

Hi Tom, That occurred to me earlier, it is -970V, which seems a little low, but there is no information on tolerance. I measured it with both a 20M DVM, and a 200M 410C. It would be nice to know what

How about the -1kV supply to the PDD electrode? It is regulated mostly by four series 200 volt zeners. If one of those were shorted, it would lower that supply and affect the geometry adjustment. You

I tried pulling the plug on trace rotation, and on y-axis rotation, and the only effect was the trace rotated one line width clockwise. I guess that eliminates them, and any fringing effects from the

Hi Matt, Did you check the various low voltage supplies before you took the power supply out of your 2246? Knowing what the individual voltages are, and knowing how much ripple is present on them will

I got my TR502 Tracking Generator, DC508 Option 7, and TM503 Option 7 all set up and I then discovered I need the 6 pin LEMO cable (3 male pins and 3 female pins) that goes from the Spectrum Analyzer

Since I only have the 308, I can't say about the tektronix ones. However, HP makes things in the 5000 series (such as a 5005B) that are signature analyzers, and peak reading voltmeters... Harvey