It may prove more useful to use dissipation factor rather than ESR even though both are a measure of the same thing. Since DF is a ratio of reactance to resistance it varies with frequency and may be more indicative of capacitor quality than plain ESR.
?? There is a good, short article on DF at:
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On 11/24/2021 3:05 PM, Gene Silvernail wrote:
Church Roger that,
The thing that helped me down the wrong path is the hybrid package. Electrically? it's radial, mechanical is axial...something new for me.
After extracting my head I re-ran cap and ESR readings.? Capacitance is within range when run at 1khz and drops off at 10 and 100 khz. ESR is around around 1 ohm at 1 khz where it goes over range on 10 and 100 khz, meaning way high for ESR numbers.? Today, SMPS's run much faster extending in MHz. So lower Z and R Caps were needed...so how good of a? ESR number is needed at 40 kHz?...So...
All readings would be good if operating below 1kHz, which they aren't. They don't even make 10kHz so...
Conclusionis they're shot and will replace...
Has anyone ever measured 10 or 100 kHz ESR on any of originals that were still working,
Thanks all the your help
Gene/K7QHO
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*From:* [email protected] <[email protected]> on behalf of Dave McGuire <mcguire@...>
*Sent:* Wednesday, November 24, 2021 6:57:38 AM
*To:* [email protected] <[email protected]>
*Subject:* Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?
On 11/24/21 7:38 AM, Chuck Harris wrote:
Depending on the manufacturer, the lead arrangement had another
more practical purpose, it made capacitor orientation irrelevant.
The outer leads were welded to the aluminum can, and were by
convention the negative leads.? The inner lead was positive.
It is virtually always the case with radial leaded aluminum
electrolytic capacitors that the outer most lead(s) will be the
negative lead, and the most central lead(s) the positive.
There were some tantalum caps in a similar package that were all
doubles, as I recall.
?? I forgot to mention this.? The capacitors in question here look like
typical cylindrical Al electrolytics, but they have a third lead coming
out from the *top* of the Al can.? See the datasheet for the
Vishay/Sprague 672D series.
???????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Richard Knoppow
dickburk@...
WB6KBL
