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Without looking at the circuit, the one thing I’d want to know is what fraction of the total resistance is owned by the pot? That fractional proportionally reduces the sensitivity of the total

For some time I have tried to calibrate a Keithley 261 Picoampere source, but I have found that some parts of the design are inherently prone to drifting. Specifically, the calibration of different

Thanks very much Peter for that information. It certainly helps explain what i have observed on testing. At 1 MHz, which is the lowest frequency for which I could measure the voltages there is indeed

I found two projects that might help: https://www.envox.eu/ This is an open source multi-channel power supply project that includes control with SCPI commands, so somewhere in the sources on github

On Sunday, 16 July 2023 at 00:25:54 BST, Morris Odell <vilgotch1@...> wrote: "It seems that there is a significant voltage drop in the connection consisting of a short (about 100 -150 mm) cable

Good point. The 308 manual lists the minimum timing between gates as 1 clock. So this is within specified behavior. The 308 is spec'd for a 50ns clock period (20 MHz). The 5004 also says 1 clock

Does the manual specify those timing details? (start/stop timing, max speeds, etc.) I would think that it does...(?). Is it working "as designed"? As for the LFSR polynomial, I remember that the

Could it be that Tek decided that the 308 would work with the way they did their SA designs, and HP did the same? I'd say that the HP design is likely the more versatile one, except that one would

Interesting stuff So the signature gets unstable at higher frequencies. It seems to be missing a stop signal and the gate window is twice what it should be. I stole the design from the Tek 308, so I

My attempt to make an adapter to excite the TF1245 from a signal generator wasn't going too well so i decided to repeat and extend my measurements.I borrowed the TF1246 HF exciter again and also a HP

Theoretically, if you know the number of clock pulses in the gate window and the EXACT data stream and timing, you could calculate the signature. In fact, I have done exactly this in the trivial case

I wouldn't argue for SA on new builds, I think it was a production tool whose time has passed. But if you like it and are writing software for a new device it's probably possible to calculate the

Harvey and Pete make excellent points. SA is really limited to a certain generation of products and it was a means of doing component level repair without necessarily having a deep technical

The problem is not so much useful/not useful as it becomes a "can you do it at all"? Take your average 6809 design (a la Tektronix).? The node points were on the data lines, address lines, control

Using modern parts, you can certainly make SA work at high speeds. There's no inherent speed limitation. But I think the main point is that SA is only useful in certain very specific cases that are

Small update: In single shot mode, I can get signatures matching a 5004 up to 5MHz (which is as fast as my current function generator can go). It also matches the unstable signature which happens when

Contact me privately at SteveHx at HxEngineering period com. Steve Hendrix

Yes, I think it was one of those that I'd seen. Either sound as though they might get you most of the way there - I think you'll be very lucky to find one that's complete in every possible way and yet

Regarding, "What have you looked at ?" I think it was this one: https://reference.arduino.cc/reference/en/libraries/vrekrer-scpi-parser/ It works against a limited set of fixed strings defined a

I have seen one but not investigated how compliant it is. I'm not sure I can find it again and be sure it's better than one you've rejected. What have you looked at ?