Typical ESR values

"The image ?ftp://jjlarkin.lmi.net/Tant_ESR_Rig.JPG? cannot be displayed because it contains errors."

I thought you were getting a real web site? Can't you use flikr in the mean time?

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Reply to
Tim Wescott
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[...]

It's fine, never had a problem with any of Johns FTP images.

Must be you!

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John Devereux
Reply to
John Devereux

Tim -

Try: copy the link and paste into browser address bar.

Reply to
John S

Both download and display fine for me, using Mozilla Firefox.

Possibly Tim is retrieving the files through a client which isn't switching to "binary" mode before retrieving? Doing ASCII-file newline/carriagereturn translation on a JPEG is very likely to mangle it badly...

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Reply to
Dave Platt

Works fine for me, using wget and display.

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Reply to
Fred Abse

cannot be displayed

he

I have had trouble and I have a very standard install. I'm on the wrong = =

computer to suggest the solution given to me.

Reply to
David Eather

f

of

larly

it if

kHz.

llowed

Nice trick. I slapped in a 10uF 35 V tant.

~80mV or 80mV/10 *50 =3D0.4 ohms.

formatting link

lotsa ringing at the step... What=92s that about? Bad technique on my part?

formatting link

George H.

Reply to
George Herold

works for me?

Jamie

Reply to
Jamie

Put a 50 ohm R across your gen output..

Jamie

Reply to
Jamie

if

That ringing is about 40 MHz. The edge from my function generator probably isn't fast enough to excite something like that. Still, it's probably lead lengths or something causing all that ringing.

John

Reply to
John Larkin

I find that some gen outputs have reactive circuits in them. Not properly terminated to bring the Q down to 1 or less.

Also, I've seen problems with lack of shoot through on complemary emitter followers as unity buffers on equipment exhibiting this effect.

A non reactive fixed load on the output normally fixes this. Ringing can be suppressed if the device that is delivering the signal has a high gain loop back and enough current handling to counter the reaction.

Many signal generators do not have feed back on their final stage to help the driving circuit maintain the output.

I've designed amplifiers to drive magnetic scan and focus coils and one of the items in the design is to have the amplifier attempt to counter act any reactive response, other wise, it'll show in the sweeps and focusing.

That's my take on it :)

Jamie

Reply to
Jamie

Does this work?

formatting link

formatting link

The web site needs work, and it's kind of a nuisance to throw files up onto. The FTP is really fast and easy, but some people can't see it.

John

Reply to
John Larkin

The question mark indicates you don't know whether it does or not. Are you asking a question Dip Shit?

Reply to
John S

Do you have a lot of smokers in your work area? why is that scope so yellow? Or is that the natural color? my Rigol is near white.

btw, I have the 100mhz version, not the software hacked 50mhz, if that makes any difference?

Jamie

Reply to
Jamie

No. I'd never hire anybody who smokes.

why is that scope so

The Rigol is a little off-white, a faint cream color. Probably the camera is set for daylight mode or something. But you're supposed to be admiring the fabulous waveform, not the photography.

This one isn't hacked. Risetime measures 5.6 ns, which is a 63 MHz bandwidth. That's fine for most of what I do. If it's not, there's my

20 GHz 11801 right beside it.

John

Reply to
John Larkin

e of

ind of

icularly

ate it if

100kHz.

ing

followed

r,

Yeah, the sharp edge. I tried the x10 probe but there was too little signal and too much noise... pickup... My lab bench seems to live in a bath of 100MHz.

I was thinking after bad mouthing my x1 probes I now have to dig one out.

George H.

Reply to
George Herold

ESR

Now, the funny thing I've got right now: I have 8 channels in parallel, supplied from a single current-limited supply. But the thing is, if the current from 8 channels at full power, flows into one channel as fault current, that's four amperes more than it was designed to run... Ever had a case like this? What's the best way to handle it?

Tim

Reply to
Tim Williams

Yeah, forgot, the wave form looks nice ;) Jamie

Reply to
Jamie

I don't exactly understand the situation. Got a sketch?

Does this involve tantalum caps?

John

Reply to
John Larkin

A description should suffice [rum disclaimer inserted here]:

Yes -- I have eight output transformers in parallel from the same current-limited PWM driver. Now, under normal conditions, all eight channels are working correctly, so the current shares evenly, and all the caps are happy (the maximum supply is 5A, so they each see a maximum of 5A / 8 =3D 0.6A peak, so the RMS ripple is under 0.42A, fine for a chip tantalum, though I have ceramic specified at the moment). But under fault, the whole 5A could flow into just one channel, which makes things "interesting". I may implement a "max-of-channels" current limit for this.

Tim

Reply to
Tim Williams

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