How to find patents for HP equipment
I'm currently looking for any patents released for the HP 8662/3A,
mostly to determine if there's any information about the firmware that
will help in debugging a faulty DCU. HP released the source code for
other equipment (e.g., the 8510) in patents.
However, my difficulty in tracking down associated patents raises the
somewhat broader question of how to reliably find patents for
devices. Currently my methods feel a bit imprecise: I go to
patents.google.com and set the patent office and language, and the
assignee to "Hewlett-Packard Company". Then, I try to determine when the
instrument was released and set the filing date range for several years
before and after this date. I also don't have a robust way currently to
determine the date the instrument was released. However, in this case
the February 1981 Journal featured the HP 8662A, so that's the date I'm
searching around. Finally, I add search terms such as "signal generator"
or "synthesized signal generator" to narrow the results.
This method will still leave 100+ entries to sift through. Moreover,
it's not always entirely trivial to determine which patents are
associated with a particular instrument. For instance, I found
US4323959, which I believe applies to the 8662A. However, this required
knowing that the 8662/3 use a switching power supply with an inverter,
which was unusual and novel for an instrument like this at that time.
Is there a better way?
The Motorola 6800 page
() lists patents
associated with that family of devices. And, the language makes it sound
like these are all the associated patents. So, maybe there's a better
way to find all the patents for a device?
Thanks
Matt
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Re: WTD: Filter capacitors for 8662A PSU
One of them tests completely open, and the ESR on the other is several hundred ohms....
I have located a set of capacitors through another person on this list, so hopefully replacing them (and all the other smaller electrolytics in the power supply) gets my unit up and running again.
73,
Bob Weiss N2IXK
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Re: HP-8753E Options Activated
The systematic is the same on pretty much all HP 8752/53/19/20/22 analyzers, you find the serial number and the 3 Fx codes are setting the options!
one word of caution though on the 8753E/ES CPU board, when removing and resoldering the SMT eeprom
?you need to clean up all flux residue throughly or you can get issues?
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Does anyone know the pinout of the 08516-60009
interconnect cable that connects the 8516 to the 8341B ?
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Re: HP 14570A AC Power Switch
Am 21.02.2022 um 08:24 schrieb Joel Setton:
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Hello,
Has anyone heard about the HP 14570A ? This is not a well-known
product, it is an AC Power Switch, made by the New Jersey Division
(formerly Harrison Labs), and described with some detail in the
December 1982 issue of HP Journal.
Would anyone have a manual or schematics for the 14570A ? I have
not been able to locate it on the Web.
Thanks,
Joel Setton
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Re: WTD: Filter capacitors for 8662A PSU
Hello Why cange them. Are they tested bad or just want to change them ?
best regards Peter
Am looking for replacements for the 2 large +/-160V filter capacitors used in the primary side of the SMPS in the 8662A synthesizer.
The original units are Sprague "compulytic" capacitors, rated 600 uf/250V.? Sprague p/n 32DR6593 They are 1.75" diameter, 3.125" long, with a screw spacing of .750".? The HP p/n is 0180-2835
I cannot find any supplier who has these units available, and the closest replacement units I can find are also non-stock, and are 2" diameter with a different terminal spacing.
Does anyone here have a parts mule 8662A they would be willing to rob the caps out of?
73,
Bob Weiss N2IXK
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HP 14570A AC Power Switch
Hello,
Has anyone heard about the HP 14570A ? This is not a well-known product, it is an AC Power Switch, made by the New Jersey Division (formerly Harrison Labs), and described with some detail in the December 1982 issue of HP Journal.
Would anyone have a manual or schematics for the 14570A ? I have not been able to locate it on the Web.
Thanks,
Joel Setton
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Anyone know what scope this transformer was used on?
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Re: HP-8753E Options Activated
Hi Marcus:
I am not sure that is entirely true yet. While I am pleased with the result, I worry that when I disabled OPT11, but then used 01 01 01 at address 0x00 - 02, which enabled OPT 10 only, may have had an effect I cannot verify. Nonetheless, I am happy to share the .bin files.?
Thanks for pointing me in in the right direction!? I am going to post these results to the eevblog too, as there were people helping me over there too.?
Rich?
On Sunday, February 20, 2022, 02:24:16 PM EST, Marcus Gustafsson <mankan@...> wrote:
Well done Rich.
Sounds like you have confirmed that 8753D and 8753E have the same EEPROM layout after all.
I did some service guide digging this morning and found some indications that they could be the same.
Br
Marcus
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Re: HP8640B manual question
Hello Bill,
?
Try erevisited@...
re your 16NN machine.
?
73 de Brian, VK2GCE.
?
?
I recently dug out two 8640B
sig generators I acquired last year. The newer (SN 16xx) has options 1 and 2
and seems to have RF as far as the counter goes but nothing at the output or
the meter. The second (SN 14xx) has no options installed; the output (checked
with a spectrum analyzer) is clean and the dials match the measurements.?
Both units are in okay mechanical condition, the gearing seems to work okay,
and each has the usual collection of dents and dings.? I have a couple of
questions:
- I can't find a service or operating manual the covers the serial numbers
around 14xx. The earlier manuals stop at 13xx and the newer manuals start at
16xx.? Does anyone know of a manual that covers this range? If not a
manual, is there a set of change pages that bridges the gap between 13xx and
16xx?
- The working 8640B does what I need for my bench work and seems to be pretty
close to specification wrt frequency and output levels, so I am inclined to
just put it on my bench and use it. That said, is there some testing or
preventive maintenance I should do?
- The non-working 8640B can probably be fixed but working out gear of this
complexity is out of my wheelhouse.? Given that the counter suggests that
RF is being generated, if I wanted to dig into the RF section, is the best
strategy just to start at the N connector and work my way backwards?
Thanks in advance!
Bill
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Re: AM modulated sine wave - Q about oscilloscope triggering
Indeed, but who needs a skinless cat at a transmitter site?
TV was more fun, dealing with Vestigial Sideband filters and RF combiners to use a single antenna for NTSC broadcast. I engineered at one high band VHF and two UHF TV stations, starting almost fifty years ago. One s a full 5MW EIRP site on 1700 feet of tower.
I worked at a few AM stations, as well.
On Sun, Feb 20, 2022 at 5:22 PM Matt Harris < kd4pbs@...> wrote: You could also use a detector and a low pass filter feeding the trigger input. That's the way we would trigger the scope on amplitude modulated modulated signals from the amplitude modulated modulated transmitters when I was an amplitude modulated modulated radio station engineer. There is more than one way to skin a cat cat ?
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It is also used in the 5316B model. I bought two of them on Ebay. at different times. Both work, and they were under $30 each, plus shipping.
On Sun, Feb 20, 2022 at 6:45 PM Paul Bicknell < admin@...> wrote: Hi From memory it is only a low frequency counter that go for about ?120 is it worth re-engineering ? ? Regards Paul ? ? Hmmm..... maybe a small programmable logic chip could emulate its functionality?? If that is described in sufficient detail in the HP Journal article.? I have a 5316A that doesn't work properly myself but haven't troubleshot it beyond a quick visual inspection.? HTH. Sent from my T-Mobile 4G LTE Device -------- Original message -------- Date: 2/20/22 2:21 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed The 1820-2131 is used in the 5315A/B and 5316A Universal Counters. I'm not aware if it being used in any other instrument.
Also known as the MRC, "Multiple Register Counter" and described with some detail in the January 1979 issue of HPJournal.
Pure unobtainum, I'm afraid ...
Joel Setton
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I recently dug out two 8640B sig generators I acquired last year. The newer (SN 16xx) has options 1 and 2 and seems to have RF as far as the counter goes but nothing at the output or the meter. The second (SN 14xx) has no options installed; the output (checked with a spectrum analyzer) is clean and the dials match the measurements.? Both units are in okay mechanical condition, the gearing seems to work okay, and each has the usual collection of dents and dings.? I have a couple of questions:
- I can't find a service or operating manual the covers the serial numbers around 14xx. The earlier manuals stop at 13xx and the newer manuals start at 16xx.? Does anyone know of a manual that covers this range? If not a manual, is there a set of change pages that bridges the gap between 13xx and 16xx?
- The working 8640B does what I need for my bench work and seems to be pretty close to specification wrt frequency and output levels, so I am inclined to just put it on my bench and use it. That said, is there some testing or preventive maintenance I should do?
- The non-working 8640B can probably be fixed but working out gear of this complexity is out of my wheelhouse.? Given that the counter suggests that RF is being generated, if I wanted to dig into the RF section, is the best strategy just to start at the N connector and work my way backwards?
Thanks in advance!
Bill
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Re: WTD: Filter capacitors for 8662A PSU
You Could try this. Still fine and working since I re-built the unit back in 2012.  Regards Gerald VK3GJM
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Hi From memory it is only a low frequency counter that go for about ?120 is it worth re-engineering ? ? Regards Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Jim Ford
Sent: 20 February 2022 22:56
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed? Hmmm..... maybe a small programmable logic chip could emulate its functionality?? If that is described in sufficient detail in the HP Journal article.? I have a 5316A that doesn't work properly myself but haven't troubleshot it beyond a quick visual inspection.? HTH. Sent from my T-Mobile 4G LTE Device -------- Original message -------- Date: 2/20/22 2:21 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed The 1820-2131 is used in the 5315A/B and 5316A Universal Counters. I'm not aware if it being used in any other instrument.
Also known as the MRC, "Multiple Register Counter" and described with some detail in the January 1979 issue of HPJournal.
Pure unobtainum, I'm afraid ...
Joel Setton
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Re: WTD: Filter capacitors for 8662A PSU
Hi Bob,
I long ago gave up trying to find replacement electro caps that are both electrically and physically compatible. Modern ones tend to be quite a bit smaller, so I just either make an adapter board to accommodate the different sizes, or stuff the new ones into the old cans.
If you have no luck finding compatible caps, those might be options to consider.
Cheers Tom Sent from my iThing; please forgive the typos and brevity
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On Feb 20, 2022, at 14:45, Bob Weiss <bobweiss1967@...> wrote:
?Am looking for replacements for the 2 large +/-160V filter capacitors used in the primary side of the SMPS in the 8662A synthesizer.
The original units are Sprague "compulytic" capacitors, rated 600 uf/250V.? Sprague p/n 32DR6593 They are 1.75" diameter, 3.125" long, with a screw spacing of .750".? The HP p/n is 0180-2835
I cannot find any supplier who has these units available, and the closest replacement units I can find are also non-stock, and are 2" diameter with a different terminal spacing.
Does anyone here have a parts mule 8662A they would be willing to rob the caps out of?
73,
Bob Weiss N2IXK
|
Hmmm..... maybe a small programmable logic chip could emulate its functionality?? If that is described in sufficient detail in the HP Journal article.? I have a 5316A that doesn't work properly myself but haven't troubleshot it beyond a quick visual inspection.? HTH.
Jim Ford
Sent from my T-Mobile 4G LTE Device
toggle quoted message
Show quoted text
-------- Original message -------- From: Joel Setton <setton@...> Date: 2/20/22 2:21 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed
The 1820-2131 is used in the 5315A/B and 5316A Universal Counters. I'm not aware if it being used in any other instrument. Also known as the MRC, "Multiple Register Counter" and described with some detail in the January 1979 issue of HPJournal. Pure unobtainum, I'm afraid ... Joel Setton
|
WTD: Filter capacitors for 8662A PSU
Am looking for replacements for the 2 large +/-160V filter capacitors used in the primary side of the SMPS in the 8662A synthesizer.
The original units are Sprague "compulytic" capacitors, rated 600 uf/250V.? Sprague p/n 32DR6593 They are 1.75" diameter, 3.125" long, with a screw spacing of .750".? The HP p/n is 0180-2835
I cannot find any supplier who has these units available, and the closest replacement units I can find are also non-stock, and are 2" diameter with a different terminal spacing.
Does anyone here have a parts mule 8662A they would be willing to rob the caps out of?
73,
Bob Weiss N2IXK
|
Re: AM modulated sine wave - Q about oscilloscope triggering
You could also use a detector and a low pass filter feeding the trigger input. That's the way we would trigger the scope on amplitude modulated modulated signals from the amplitude modulated modulated transmitters when I was an amplitude modulated modulated radio station engineer. There is more than one way to skin a cat cat ?
|
Re: Mixing 'n' matching S parameter test sets
Thanks, John. I was hoping that was what you’d meant. ?
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From: [email protected] <[email protected]> On Behalf Of John Lyles
Sent: Sunday, February 20, 2022 12:36 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Mixing 'n' matching S parameter test sets? S parameters, as you know, can be characterized by S11, S21, S12 and S22. The two port test sets have enough directional couplers and power splitters inside to measure all four, by switching the direction of the RF feed, if directed to do all four measurements by the VNA controller. However, the 8754A was built long before that became a necessity for fast bench measurements. There are still just two ports on the test set, I am sorry if I confused the topic. I meant four S parameters being measured.
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Brian
Michael A. Terrell
bill K7WXW
Paul Bicknell