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Re: 6632B supply stuck in PROT mode, unable to reset.

 

The output protection crowbar circuit is likely shorted. This has happened to multiple folks who have charged batteries with 6632's.?
It should be repairable. Or at least all the cases I recall hearing about were.
Re: 6632B supply stuck in PROT mode, unable to reset.

 

If this is the typical battery charging fault one has with a 6632, then the output protection crowbar circuit is shorted.? ?
IIRC the thyristor and possibly some associated parts are toast.
This happened to some folks in the local electronics scene some 10years back when surplus 6632's were plentiful.
Many of us got multiples and when you have a pile of 6632's you do everything with them. So a handful got the over voltage protection crowbar burnt out by folk charging car batteries and lipos with them.??
All of the units I know of were later repaired.
Unfortunately my IRC logs don't go that far back so I cannot check the specifics.
Re: VNA Resonance Methodology

 

Sorry, Froggie, I can't help you on the Honymooners; never seen it.
I do have the Rolls-Royce of GDOs: the Boonton Megacycle meter, but because that runs off 110V it would require me to dig out a variac to halve the supply to it. So for expediency, I've been using a FET based dipper (it's pretty damn good, too) instead. I didn't doubt its capabilities; the main reason I went to a VNA was to get away from the plug-in coils limitation which effectively means you can only sweep a band where you believe your resonance lies. A VNA is not in that way constricted (although you do have to re-calibrate after a significant change in frequency, which probably takes longer that swapping out coils! :(
Re: VNA Resonance Methodology

 

Renaud, yes this is fundamental stuff. However, there are a lot of fine points within the fundamentals that as a child you don't learn first time around. You couldn't or you'd never progress in the study unless you were fanatically-driven! Anyway, it's kind of fun to get into the granular detail of these little things once you've got a good overall grounding of electronics.
Re: VNA Resonance Methodology

 

VNA is overkill.

Grid dip must be very loosely coupled.

Coil as described should be fine.

No idea what's " paxolite" check material losses.

We used AirDux or fiberglass or lucite cylinders as coil forms.

See old Boonton, Measurements Inc. HP App notes on Q meters

Use high series R like 10k carbon composition to make current source, low C V probe.

Bon chance

Jon


PS...Jinxie...1950s TV Jackie Gleason..the Honeymooners...Jinxie was the Wife of Ed Norton?
Re: HP 10811-60085 (10 MHz OCXO) No hits when searching for data...

 

The E8663D
Re: VNA Resonance Methodology

 

This is a nice post. I'm learning interesting tricks. Maybe re-learning but that's what "going back to fundamentals" means no?
Cheers to all,
Renaud
Re: Sticky ink of schematics

 

Will do. An update, I found exactly what to call this courtesy of someone from EEVblog. Was found thru searching "toner" in the old threads.
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I've currently stopped any separation on my part to see what options I can take. Also I'm in the Houston area in Texas. Some of the stuff was stored in a neighboring state. For the most part it gets hot and humid but can get snow/frost. I suspect heating from many summers in a warehouse did this.
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-Lex
Re: Sticky ink of schematics

 

On Mon, Nov 25, 2024 at 02:02 PM, Lexter Negron wrote:
Any tips and tricks
I don't know which city you are in.
But, many cities, especially big ones, have a public Archive, staffed with professional archivists.
I guess... mileage will vary, on the 'experts' ... but I found the archivists, in my city, very knowledgeable about 'recovering' and 'prep-ing' old, and damaged, documents, for scanning.
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There are some journals, and monographs, I am aware of; but a professional archivist would know better.
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Besides using the kind of 'gentile' mechanical separation, using thin spatulas, or specialized bone tools... sort of... like you are doing...
One technique for separating pages, I know of, is to use of a 'humidity chamber.'
Another is freezing.
Both sometimes work... but not always... so it's best to experiment first.
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If the pages are damaged, or the ink is damaged, to begin with, or during separation... sometimes the paper can be reinforced with Japanese tissue paper (conservation paper) and 'wheat starch paste.'
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Re: Sticky ink of schematics

 

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I¡¯m simultaneously posting this on the eevblog for solutions. It¡¯s bad when I come to the foldouts. :/ I have significantly better luck with separate pages. Especially if they don¡¯t have print on both sides. This is a HP CLIP btw. Using a plastic spatula meant for walls or deicing a fridge.
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-Lex
Re: VNA Resonance Methodology

 

Er..., yes, That's the other thing I got wrong. I've made 49 turns close wound, so I'm screwed on the overall length, the number of turns and the Q. Par for the course for a first attempt (of a young child!) Perhaps I'll measure the inductance alone just out of curiosity and see how far out I got it from the intended value.
I really must try harder. :(
Re: 6632B supply stuck in PROT mode, unable to reset.

 

OV is for over voltage. That will allow you to follow the troubleshooting flow chart.


On Sun, Nov 24, 2024, 11:29 PM Michael - AF7U via <michael.rosanbalm=[email protected]> wrote:
I forgot to mention, the values for voltage match what I read on the output pins on the PCB.
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Re: VNA Resonance Methodology

 

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I tapped in your coil dimensions into some old software, and with a 31mm former you would need about 42 turns of? 0.4mm wire closed wound to get about 50uH using a 20mm long former.
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The Q at 1.45 MHz is not that great at about 130. The software below allows any parameter to be edited and so the Q curve and all the data gets updated in real time after each change to the design (turns, diameter, length etc).
It usually produces good results as it's based on the classic tables and graphs for solenoid design. It also uses the classic equations for Q.
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Re: VNA Resonance Methodology

 

If half the length (while holding everything else constant), then you get about twice the inductance, so your resonant frequency will be about 70% what you targeted.

It is best in general to space the windings apart by something similar to the wire diameter. In the frequency range you're looking at, you'll about double the Q if you do so.

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070

On 11/25/2024 5:38 PM, Jinxie via groups.io wrote:
I think this is where I may have gone wrong. I'm winding this on a 31mm diameter paxoline former with no core as per the formulas. The wire is 0.4mm and the overall length of the solenoid should have been 20mm. Mine was less than half that as I'd wound the turns touching (yes, they are varnished). That must have thrown the calcs out. Not sure how I made such an oversight but there it is.
Re: VNA Resonance Methodology

 

I think this is where I may have gone wrong. I'm winding this on a 31mm diameter paxoline former with no core as per the formulas. The wire is 0.4mm and the overall length of the solenoid should have been 20mm. Mine was less than half that as I'd wound the turns touching (yes, they are varnished). That must have thrown the calcs out. Not sure how I made such an oversight but there it is.
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-J.
File /All HP, Agilent and Keysight instruments in folders by part numbers/5000 to 5999/HP_5315A_Operating_and_Service_Manual.pdf uploaded #file-notice

Group Notification
 

The following items have been added to the Files area of the [email protected] group.

By: jack <jfrazer716@...>

Description:
HP 5315A operating and service manual
Re: VNA Resonance Methodology

 

To avoid disappointment with the Q that you achieve on your initial attempt, it might be worth it to list what inductance you want and what Q you would be happy with at 1.45 MHz.?
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If I assume 50uH and about 250pF for your resonator, I think you would have to make something quite large if you were hoping for a high Q at 1.45 MHz from a classic air cored 50uH solenoid.?
This assumes you are using enamelled copper wire of maybe 1mm diameter. Having close wound turns makes the winding easier but it will obviously produce a lower Q.
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You could always use Litz wire if this is practical for you as this should boost the Q quite a lot at 1.45 MHz even with close wound?turns.
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The other alternative would be to use a ferrite core based inductor. It should be possible to get a Q of about 400 at 1.45 MHz with a small ferrite core inductor with about 50uH inductance. But this won't be suitable for large signal operation.
Sticky ink of schematics

 

Hello, I want to scan and save forever schematics I recently found from a warehouse. The problem is the ink. Storage conditions for decades are unknown but I assume this wasn¡¯t kept in an air conditioned environment. It wasn¡¯t exposed directly to a flood so at least I have that going for me. However, hot and cold with possible humidity in the mix for decades will still take a toll. Any tips and tricks on how to separate papers from themselves or it¡¯s plastic cover without lifting the ink?
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-Lex
Re: HP 10811-60085 (10 MHz OCXO) No hits when searching for data...

 

I spotted my mistake as well.
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The only 10811- I had in my junk box was a -60111 but I decided to try it
in spite of not being specified for PN anyway.
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I also decided to replace a few capacitors around the POL regulator
on the interface board.
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Before and after the steps above, I listended to a carrier using a 145 MHz
FM radio for hum and noise.
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I also used a 89441 in spectrogram mode and could verify that
the power line frequency noise present close to the carrier when testing
before modifications was gone.
Also a sort of "random noise bursts" around the carrier
which could be seen at first was gone as well.
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It would be intersting to know what types HP replaced the 8662A/8663A
with when they were discontinued.
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Ulf
SM6GXV
Re: HP 8341B 1992 firmware version

 

Hello,
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You can find it here:
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Regards
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