imperfect exponential

Actually my 466 crashed the first time I turned storage mode on, and has never recovered. (It's sitting in the back of a closet here someplace, unlikely to see the light of day.)

At least Windows lets you play solitaire on your scope. ;)

Cheers

Phil Hobbs

You can shop Amazon on the LeCroy. Try that on a 466!

I think I saw a reference to an analog meter that used a tiny stepper motor to rotate the needle. As I recall, they use them in automobiles.

So, build your own meter.

Oh I forgot to respond to the post by Phil. You can still buy meters. (I too like a meter when tweaking up a signal... optical or otherwise.) Phil, I've got a couple Hoyt meters on my shelf. (not edge reading) and not micro amps but (I think) 1mA FS.

Here,

You'd have to gain up the current. (Also two edge reading meters, not zero center, and 1mA FS)

Want 'em?

George H.

It can also send out spam. :)

Have been following along?

I wouldn't have it. I'm not much one on analog scopes anymore, but I'm not a fan of Winblows scopes, either.

You can't grab the waveform and manipulate it on your 466. The 466's FFT function isn't worth squat, either.

Yep, modern speedometers and tachs are stepper motors.

• I said NOTHING about calculus or number theory. Shoot,the values and curve seen on the screen lends to a simple non-math RC interpretation that any electronic tech should be able to do in under 100mSec.

My handwriting is so abysmal that I no longer try.

Isn't it obvious? The wet electrolytic needed to be re-formed...

Slightly more plausible: Non-linear C-V characteristics. The charging curve seen on the scope is so bad that it is an obvious distortion of what should be a standard C charging curve. The first 2 minor divisions show a long RC curve; in the middle the RC is obviously a LOT shorter.

Some of the old chart recorders used long thin pencil-sized galvos that basically were taut-band meters without magnet (the other part of the meter); 16 channels (i think, been 40-50 years) were typical. If you can find one or two of those chart recorders mouldering in some surplus shop...

Now, do not dis him! He obviously had other things in mind, and this was a quick experiment with a jotted note, hastily "scribbled". I dare say that most of us old farts cannot PRINT as well or as neatly.

Whichever is easier. I'd settle for any small constant current source for charging and a sawtooth wave discharge if that is easier to do. Or diodes in series to do charge by constant current discharge by R.

Looks like you could use a sine wave to about 1v peak to peak across the capacitor at most without the capacitance changing by too much.

Which he then posted on-line. Confusing your readers with rotten hand-writing is inconsiderate.

Krw's thinking went the same way a few years ago.

You might use an ILS indicator from an airplane. The small aircraft are changing to glass cockpits, and there are abandoned indicators around.

The indicator has two zero-center meters with needles at 90 degrees to each other, just good for the X-Y display.

Why would I want to do that?

True, only engineers are interested in knowing what's really going on.

Interesting, thanks. That would sure make a fun retro look.

Cheers

Phil Hobbs