User Profile

MDOC replied to recommend ESR meter, Multimeter, hot air rework station

in Equipment Usage, Soldering, Techniques, and Reviews

09-01-2013, 01:45 AM
Re: recommend ESR meter, Multimeter, hot air rework station

In response to your request for a picture, the only thing I'll say is I'm older than you. I don't want a debate either, but for different reasons that have nothing to do with anonymity. This medium is a poor source for assessment of character flaws, but there has been foolishness. Have a nice day!

See more | Go to post
Leave a comment:
MDOC replied to recommend ESR meter, Multimeter, hot air rework station

in Equipment Usage, Soldering, Techniques, and Reviews

07-05-2013, 08:42 PM
Re: recommend ESR meter, Multimeter, hot air rework station

Hardly. You think I'm playin'?

[URL="http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&ved=0CEgQFjAE&url=http%3A%2F%2Fti.arc.nasa.gov%2Fpublications%2F5352%2Fdownload%2F&ei=_oHXUcD1FvSz4AOJiYHIDw&usg=AFQjCNE9Cq0s1LDopBiTTyv6vJhL6e3HWw"]NASA report[/URL]Re: recommend ESR meter, Multimeter, hot air rework station

Hardly. You think I'm playin'?

[URL="http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&ved=0CEgQFjAE&url=http%3A%2F%2Fti.arc.nasa.gov%2Fpublications%2F5352%2Fdownload%2F&ei=_oHXUcD1FvSz4AOJiYHIDw&usg=AFQjCNE9Cq0s1LDopBiTTyv6vJhL6e3HWw"]NASA...

See more | Go to post
Leave a comment:
MDOC replied to recommend ESR meter, Multimeter, hot air rework station

in Equipment Usage, Soldering, Techniques, and Reviews

07-04-2013, 12:07 AM
Re: recommend ESR meter, Multimeter, hot air rework station

That's all well and good, but I'm not talking about the LCR. Got nothing to do with it. I'm talking about an ESR meter.

No. For one thing, caps a few years old are still populated on boards. For another, although electrolytic cap design may improve, the measured ESR value is just a measure of capacitor degradation, not performance. Over the electrolytic cap's lifetime, they degrade in both ESR and value....

See more | Go to post

Last edited by MDOC; 07-04-2013, 12:08 AM. Reason: correct formatting error
Leave a comment:
MDOC replied to recommend ESR meter, Multimeter, hot air rework station

in Equipment Usage, Soldering, Techniques, and Reviews

06-23-2013, 09:12 PM
Re: recommend ESR meter, Multimeter, hot air rework station

This video demonstrates why an ESR need not be terribly accurate

[url]http://www.youtube.com/watch?v=N_wbk2F_syg[/url]

The analog meter just needs to be in the right scale. So it is with digital displays. But an auto-ranging ESR meter helps.Re: recommend ESR meter, Multimeter,...yg[/url]<br />...

See more | Go to post
Leave a comment:
MDOC replied to recommend ESR meter, Multimeter, hot air rework station

in Equipment Usage, Soldering, Techniques, and Reviews

06-23-2013, 08:50 PM
Re: recommend ESR meter, Multimeter, hot air rework station

I wonder what your response will be after you read this expose on Amazon:

[url]http://www.amazon.com/review/RO7SLKUNJ2LVN/ref=cm_cr_dp_cmt?ie=UTF8&ASIN=B0053H6EDM&channel=detail-glance&nodeID=16310091&store=industrial#wasThisHelpful[/url]

edit: this review is about the AMM-3031Re: recommend ESR meter, Multimeter,...sHelpful[/url]...

See more | Go to post

Last edited by MDOC; 06-23-2013, 08:53 PM.
Leave a comment:
MDOC replied to recommend ESR meter, Multimeter, hot air rework station

in Equipment Usage, Soldering, Techniques, and Reviews

06-23-2013, 07:58 PM
Re: recommend ESR meter, Multimeter, hot air rework station

"Totally" incorrect, because, you see, the Aktakom AMM-3035 is an LCR meter without ESR functionality. It's not an ESR meter. In addition, 20,000 counts doesn't make it more accurate. The basic accuracy spec does.

But even there, the "2d" in the spec (and "3d" also) mean up to 3 digits error in the reading (not "counts", the "digits" refer to numbers in the LSD of the readout). No metering device has only a single digit error.

[url]http://www.bkprecision.com/products/component-testers/lcr-meters/879B-40000-count-dual-display-handheld-lcr-meter-with-esr.html[/url]...

See more | Go to post

Last edited by MDOC; 06-23-2013, 08:19 PM. Reason: typo correction
Leave a comment:
MDOC replied to recommend ESR meter, Multimeter, hot air rework station

in Equipment Usage, Soldering, Techniques, and Reviews

06-20-2013, 02:11 PM
Re: recommend ESR meter, Multimeter, hot air rework station

Hahaha, you're wrong, my friend. The ESR doesn't use that 760 Hz frequency. And it's not AC. I've already done an analysis on it. Take a look here:
[url]https://www.badcaps.net/forum/showpost.php?p=274344&postcount=46[/url]Re: recommend ESR meter, Multimeter,...ww.badcaps.net...

See more | Go to post
Leave a comment:
MDOC replied to ATTEN 8586 Not heating the Iron

in Equipment Usage, Soldering, Techniques, and Reviews

06-17-2013, 03:32 AM
Re: ATTEN 8586 Not heating the Iron

Somebody does not know English well in China....

See more | Go to post
Leave a comment:
MDOC replied to Self-discharge electrolytic capacitors

in General Electronics Technical Discussion

06-16-2013, 04:32 AM
Re: Self-discharge electrolytic capacitors

I believe it was much longer than several minutes... hours. Certainly less than 24 hours.

See more | Go to post
Leave a comment:
MDOC replied to Self-discharge electrolytic capacitors

in General Electronics Technical Discussion

06-16-2013, 04:27 AM
Re: Self-discharge electrolytic capacitors

I meant that soon after charging up a large cap, the cap was shorted, and there was a loud bang. A period of time, I don't remember how long....

See more | Go to post
Leave a comment:
MDOC replied to Oscilloscope: Which one should I choose?

in Equipment Usage, Soldering, Techniques, and Reviews

05-12-2013, 06:09 AM
Re: Oscilloscope: Which one should I choose?

Well, look at it this way: back in my day, scopes (Tek scopes) cost thousands if not tens of thousands. This one is cheap.

See more | Go to post
Leave a comment:
MDOC replied to Oscilloscope: Which one should I choose?

in Equipment Usage, Soldering, Techniques, and Reviews

05-11-2013, 08:57 PM
Re: Oscilloscope: Which one should I choose?

I haven't developed an opinion on either/or, but I've seen both the Rigol and Owon reviews and at first didn't like the Owon much.

For Rigol, end of life doesn't mean anything because there will still be repair support even if not at Rigol locations. End of life just means no longer supported by the manufacturer.

If you get one from Saelig, both the Rigol and Owon have free shipping, free carry case, and 5% educational discount. Carries a 3-year warranty, too.

But, having also seen the Rigol review,...

See more | Go to post
Leave a comment:
MDOC replied to Self-discharge electrolytic capacitors

in General Electronics Technical Discussion

05-06-2013, 08:38 AM
Re: Self-discharge electrolytic capacitors

Depends on the cap design. Had a cap pop on me years ago in class after several minutes.

See more | Go to post
Leave a comment:
MDOC replied to Self-discharge electrolytic capacitors

in General Electronics Technical Discussion

05-05-2013, 08:54 PM
Re: Self-discharge electrolytic capacitors

No. This leakage (Rp) is through a resistor in parallel with a cap. A cap, especially a large electrolytic one, will hold a charge if cap is removed from a circuit. The charge will dissipate eventually over time, but too slowly enough that it will still hold a charge....

See more | Go to post

Last edited by MDOC; 05-05-2013, 09:00 PM.
Leave a comment:
MDOC replied to Self-discharge electrolytic capacitors

in General Electronics Technical Discussion

04-28-2013, 09:28 PM
Re: Self-discharge electrolytic capacitors

OK - but I meant that a cap removed from a circuit will hold a charge - there is no discharge.

See more | Go to post
Leave a comment:
MDOC replied to Self-discharge electrolytic capacitors

in General Electronics Technical Discussion

04-28-2013, 11:57 AM
Re: Self-discharge electrolytic capacitors

yes, there is some discharge, how much I don't know but depends on the size and capacitance. Big caps can hold a charge for a long time.

See more | Go to post
Leave a comment:
MDOC replied to Self-discharge electrolytic capacitors

in General Electronics Technical Discussion

04-27-2013, 08:06 PM
Re: Self-discharge electrolytic capacitors

No, because of the phrase you mentioned: "when it was connected across the DC voltage." In that configuration, there is no discharge because DC is continuously applied to it. If the phrase is modified this way: "when it was connected across a bleed resister to ground," you'd be right. But, without connecting the cap's leads to themselves or to a circuit, there is little or no discharge.

See more | Go to post
Leave a comment:
MDOC replied to Picking the right pcb preheater within budget.

in Equipment Usage, Soldering, Techniques, and Reviews

04-21-2013, 05:06 AM
Re: Picking the right pcb preheater within budget.

Well, you said 2-300, so it can be interpreted as "from $2 to $300"
I think you meant 200-300.

(Sorry, can't recommend one for you, I never did reballing.)...

See more | Go to post
Leave a comment:
MDOC replied to Help Tektronix 466 repair advice

in Equipment Usage, Soldering, Techniques, and Reviews

04-21-2013, 04:31 AM
Re: Help Tektronix 466 repair advice

epicfatique
The Tek 466 is discontinued product (long discontinued!), so don't waste your time calling TEK.

See more | Go to post
Leave a comment:
MDOC replied to Blue Ring Tester Error???

in Equipment Usage, Soldering, Techniques, and Reviews

04-21-2013, 04:03 AM
Re: Blue Ring Tester Error???

For future reference when looking at schematics, it's easy to tell an NPN from a PNP:
NPN = "never pointing in"
PNP = "Pointing in"

See more | Go to post
Leave a comment:

No activity results to display

Announcement

Profile Sidebar

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment: