Where are all the ESR meters?

But the voltage of interest is across the 1mR+10nH, which still is 10us. The fact that you put a 50R somewhere else is just significant for the

50R enclosing circuit.

Unless you want to check that you indeed obtain a 50.001 ESR cap :-)

--
Thanks,
Fred.

Hmm, only 26 years, he retired early, or what? My main technician has been working for me since 1974, so that's 33 years, and counting.

He was almost 50 years old when I hired him (I was 24). Jim Foster is the fellow I've told about who already had a long history in the automotive industry in Michigan, moved to Arizona and worked in an aluminum foundry... until someone stumbled and poured aluminum into the top of his boot :-(

So he decided to get into another profession, and ended up in my class for technicians ;-)

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave

Gawd, 1964 is 43 years ago...

So? I'm 67 and making money hand-over-fist. And my father is still working, at 88 ;-)

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave

sunk in

really, with

troublemakers

What should you care about my opinion or activities, since it is obvious I am less than nothing as an engineer, a person, or even a member of the human race...

I did not know the commercial instruments allow you to adjust the frequency. For electrolytic testing the standard seems to be a series model at 120Hz until Z exceeds 10 ohms, then it switches to a parallel model at 1KHz.

[snip]

You sure got that right :-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

| 1962 | America: Land of the Free, Because of the Brave

One thing I like about my company is that we have no cost collection system at all... no time cards, no charge numbers, nothing. Everybody is salaried, so we don't track anybody's hours. The only forms we have are for things where keeping a record makes sense, like ECOs that direct that an assembly procedure or BOM be changed, and what it applies to, and most importantly *why* the change was made.

Test folks and production people can and do write ECOs, not just the engineers. I approve and sign them all, just to keep things organized. If there's an immediate problem, people just get together and fix it, now.

There's also a form for adding a part to the PADS library. I am also the Parts Tsar, the only guy who can approve adding a new part to the library... sometimes, it's already there, or we have something that's just as good, or the proposed schematic symbol doesn't meet "company" standards, so it makes sense to have one person coordinate that.

We do keep a "NEXT" folder on a server, with a text file for every rev of every assembly that we make. Anybody can edit the file and make suggestions for the next time we roll the assembly rev, noting any problems, ideas, cosmetics, testability issues, anything at all. We always review and discuss the NEXT file before we rev anything, which often involves talking to the person who made the entry and working something out.

The only way we make any end-item change is by cutting an ECO. If you don't do that, the accumulation of dirty tricks will overwhelm you, and you'll keep solving (or not solving) the same problems. With digital cameras, ECOs are a lot easier that they used to be. I could post a couple to abse if anyone is interested, and I'd like to see other peoples' forms, too.

NO! NEVER! 9001 is a goofy waste of time and has been shown to not improve quality. It was invented by Europeans in an attempt to make the rest of the world as inefficient as they already are.

Every doc we've ever released is online on our server, available to everybody.

Production keeps their own set of manufacturing notes, also on a server. The engineering drawings define an end result, but manufacturing can partition and stage the assembly any way they like as long as the end result conforms with the formally released drawings. So it's fine if they keep informal notes for themselves, but we like them to do it on a server, not loose pieces of paper, so we can back it all up.

If the people are good and care about what they're doing, all sorts of procedures become unnecessary.

John

Given a choice, I'd be thinking of generating the sine from a 'walking ring counter' and a few resistors.

8 sections could give 1% THD unfiltered and the "C" quadrature component pickoff would at least have a chance of being only a few degrees adrift, hence the "adj delay" being far less critical considering the lags in the agressive LPF needed for the square wave. Looking to Speff's 'superior' spec' it would also now be as easy to pick off an "L" sync (ie LCR measure) or to inc/dec the frequency in decades, to allow extending out the impedance ranges.

devastating...

[snip]

Why not generate a direct sinusoidal oscillator? Pretty trivial with good OpAmps.

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave

Those methods can work well with the right people, and in smaller companies. The place I worked for had people scattered around the world. and more layers of bureaucracy than an onion. They had been in business over 30 years, and held to pre computer business models with a piece of paper for everything, or nothing was done.

When I started work there I was told not to even try to have any problems corrected by engineering. It took years for a request to go from the manufacturing floor to engineering and come back, no matter how simple, or critical it was. They even had a policy of refusing to do ECOs on any product designed more than two years ago.

BTW, you were looking for some DIN rail boxes a while back? Bud industries has some in their line:

They also have some other interesting plastic cases in their line.

I never expected to see a Plastic Rackmount Box:

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Biggest problem I've found, is (reliably) squaring up the sines to drive the synchronous switches. Sine driven mixers can work well but component count goes up. Easiest of all, a couple of phased DDS' and a PIC but the cheap and cheerful aspect is then lost. :)

I disagree with the claim of "easiest" for that. If you used a silabs C8051F120 then you may be getting to the "easiest".

Op-amps C8051F120 /! --------------- !Display ! ! ! ! !\\ ! ! !------------!ADC0.0 ! ! !/ ! ! --- unknown ! ! --- ! ! ! !\\ ! ! !------------!ADC0.1 ! ! !/ ! ! ! ! ! !

Hey Jim,

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

I don't suppose you have a copy of the curriculum for your technician classes left anywhere? That you might be able to scan in and post?

I really don't know for sure. Might. I'll look thru my files. But that was 43 years ago :-(

What I do know I have is Jim Foster's notes and schematics on _everything_ I ever designed, including the duds ;-)

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

Don't worry about it. :-)

So how did your interaction work? You handed him a schematic and he went to work and handed you back a board? :-)

Yep, I handed him a pencil sketch and some notes. Back came the board(*) and "pretty" documentation.

(*) Point-to-point wiring like in...

VERY occasionally we'd do a preliminary PCB ourselves, but usually a drawing just went directly to the PCB group.

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave