Re: New phase lock board for 8753ES - qualitative first test
I'm tired when I got to the lab tonight but the interesting thing so far is that it seems every single component I have checked is within tolerance, from the 0.1% resistors to the reference Zener to the YIG oscillator.? Testing is frustrating because the same test gives different results on different days.? I may be dealing with a tolerance issue where some items are adding up high and some others are adding up low with the net result that the unit fails.
For example the YIG oscillator is specified with a sensitivity of 23 +- 1 mA/GHz and my initial measurement shows it at 22.15 mA/GHz. Now the pretune voltage is slightly high - still in spec - but combined together this is too far out for the firmware to capture.
I can try something simple as a test:? if I add in 3.4 ohms in series with the 40 ohm sense resistor this will center the tolerances.? East enough to do and just as easily reversible.? I have two YIG oscillators to play with so can measure each, and each phase lock board.
This weekend.
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On 3/22/2019 8:52 AM, Jim Cotton via Groups.Io wrote:
My experience with a HP 70900A LO and a similar range YIG (ie, not correct part number) from a signal
generator of the same era was that I had to play with the resistor divider (DC) network to get it into range
so the diagnostic software could change the control word.? The YIG had the "plumbing" pointing in a
different direction (straight out the side)? so the RF shield could never be installed, but it worked.
The manual said (roughly) at x volts you should have y to z Ghz out, if not change the resistors...
It took two years to find all the HP 9000 pieces to load the diagnostic software.? Doing calibration of the
HP 70000 units requires so many obscure and expensive HP pieces of test equipment I gave up collecting them.
Jim
On ?Thursday?, ?March? ?21?, ?2019? ?09?:?57?:?08? ?PM? ?EDT, Peter Gottlieb <hpnpilot@...> wrote:
Today I received a new A11 phase lock board for my misbehaving 8753ES (thank you
Pete M!).
A lot of measurements will follow as I have lab time, but I thought I'd run a
simple "plug it in and hold ears" test.
Test 48 now passes.? The 1 V/GHz waveform test on the analog bus has the same
shape as before, but the starting voltage is below 3.5 volts instead of 3.6 as
in the original board.
I still have some intermittent lock issues below 10 MHz but this is major progress.
I have a lot to do, including Root Cause Analysis of the failure of the original
phase lock board.? Perhaps the precision 6.2 volt reference zener has gone out
of tolerance, it would only need to be a few percent off.? I will see.
What this means is that when the troubleshooting guide says the waveform should
be as they show, it means literally in this case.? A waveform starting at 3.6
instead of 3.5 volts may cause failure.
Much more to follow!
Peter
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This was my first upload and I didn't do it right.? I uploaded 10 pictures of the frequency doubler of the 8657B.? I neglected to rename the pics to something useful, and I didn't explain what they were.? So nobody will know unless I can be shown how to correct this.
Bob
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05083.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05083.JPG
Cheers,
The Groups.io Team
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Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05092.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05092.JPG
Cheers,
The Groups.io Team
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Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05091.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05091.JPG
Cheers,
The Groups.io Team
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Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05090.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05090.JPG
Cheers,
The Groups.io Team
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05089.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05089.JPG
Cheers,
The Groups.io Team
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05088.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05088.JPG
Cheers,
The Groups.io Team
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05087.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05087.JPG
Cheers,
The Groups.io Team
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05086.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05086.JPG
Cheers,
The Groups.io Team
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05085.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05085.JPG
Cheers,
The Groups.io Team
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05084.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05084.JPG
Cheers,
The Groups.io Team
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: DSC05083.JPG
Uploaded By:
Bob Albert
Description:
Innards of the frequency doubler.
You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/DSC05083.JPG
Cheers,
The Groups.io Team
|
Re: NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B
I read about the 6811B and in the worst case I could redo the calibration constants myself, I will buy a DS1230Y from Digikey and make the replacement. Thanks. ? Regards Yves De?: [email protected] <[email protected]> De la part de Greg Muir via Groups.Io
·¡²Ô±¹´Ç²â¨¦?: 21 mars 2019 19:15
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B ? The DS1230Y utilizes an encapsulated internal battery.? The battery is disconnected until external power is applied breaking the "freshness seal" and connecting the battery to the RAM.? So with a new device you are dealing with battery shelf life until it is powered up.? And I assume that nearly all if not all device programmers will supply power to break the seal and allow you to program it and remove it from the socket without losing the newly programmed contents.
Good reading:
Some of the above data reflect older dates.
I see that Digi-Key still handles large quantities of the DS1230Y:
As well as does Mouser:
And others out there.
Greg
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Re: HP5335A fan replacement
Dan,
The change occurred in the April 25, 1985 update:
"Change B1 from 3160-0209 to 3160-0450 FAN-24VDC, 36 CFM"
The closest I could find in today's market is the EBM Papst 8124G. This fan has a specification of:
35 (not 36) CFM
38 dBa
18 - 30 VDC.
I also found this fan in several 5335A counters installed at the factory by HP, so I figure it's the right one. I found some for about $22 in an online search.
The 8124K is the ball-bearing equivalent to the 8124G, which is sleeve bearing.
Hope that helps!
Regards,
Joe
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Re: I'm officially lost now with this 8753ES
Wow, I can't imagine that any engineer who was able to get hired by HP
wouldn't understand why JPG isn't appropriate for screen shots or other
line art. (or anything else that isn't a continuous-tone natural scene,
which is what JPG was designed for, and the only thing for which it
works well) The options weren't great back then, unfortunately. The .PNG spec was brand new and hadn't caught on yet. Unisys was shaking everyone down for royalties on the .GIF patent. I'm not sure .BMP existed at that time -- I believe it did, and it would have worked, but it was mostly a Windows-specific format. Dunno if the Unix and Mac people would have been happy with that. .TGA and TIFF would have worked but the files were large and cumbersome, and as I recall they weren't used widely outside the desktop publishing business. .PCX and .LBM would have worked well since RLE compression is a good fit for this type of file, but again they didn't have a lot of support across different platforms and industry sectors. So that left .JPG. While definitely not the 'right' format, if you crank the quality level up high enough, it could yield tolerable results, and unlike .GIF it could be freely implemented. Arguably HP should have paid the danegeld for the .GIF license and called it good, but it's hard to second-guess them at this late date. -- john, KE5FX
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Re: HP5335A fan replacement
On Tue, Mar 19, 2019 at 07:22 PM, Joe / KN5U wrote:
By the way, the original fan was 120 VAC, but repair note changed the fan to 24 VDC. This was precipitated by the power supply relay and socket overheating. The repair note had a description of a circuit mod using a diode and also replacing the fan and socket. I have done a few of these mods and this a fairly simple fix. Let me know if you need a copy of the change.
Joe, KN5U
I have looked extensively, but have not found a 24V fan with the necessary airflow specs that also had quieter operation than the fan already in the unit. You mention that you have done some mods to change the fan from 110V AC to 24 V DC. What fan did you use as the replacement and do you happen to know its airflow/noise specs? Thanks, Dan
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Re: Replacement battery for 8566A
On Fri, Mar 22, 2019 at 03:04 PM, Adrian wrote:
Yup, that's the one, not as nicely made as the HP original but it dropped straight in and is still running! I'm not using the 8566A as much as I was these days so I find I need to fire it up for a few hours each week to keep the battery topped up but it does the job. Modifying it so it charges in 'standby' has been on my list for a few years ... I'll get there one day....!
Awesome, thanks! My battery is completely dead, even running it for a few hours won't charge it. Hope you share the modification if you ever get around to it. :o) Sean
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Not sure about that one, it came out of the 1500MHz plug-in SA hat Fi he HP180 scope Regards, ? Stephen Hanselman Datagate Systems, LLC 3107 North Deer Run Road #24 Carson City, Nevada, 89701 (775) 882-5117?office (775) 720-6020?mobile s.hanselman@...
a Service Disabled, Veteran Owned Small Business DISCLAIMER: This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.
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On Mar 22, 2019, at 14:14, rpoz28cam via Groups.Io < rpoz28cam@...> wrote: Steve, Is that one fit a 8590A by chance? ?I have another box that has a noisy Yig in it as well. ?I suspect the yig heater isn¡¯t working, it drifts +- several hundred Khz. ?Causing to analyzer to fail the 100Khz band width confidence test.? Let me know & I do appreciate you looking. ?
Thank you,?
Jon Sent from my 20" Texas sized? On Mar 22, 2019, at 1:30 PM, Stephen Hanselman < kc4sw.io@...> wrote:
Jon, ? I only have one good HP 5086-7080 2.05->3.55GHz Sorry, ? Steve ? ? Hello,? Stephen that would be great. ?Thank you! Sent from my 20" Texas sized?
On Mar 22, 2019, at 1:29 AM, Stephen Hanselman <kc4sw.io@...> wrote:
I have a couple of HP and several avantek units. ?I¡¯ll check the on in the morning Regards, ? Stephen Hanselman Datagate Systems, LLC 3107 North Deer Run Road #24 Carson City, Nevada, 89701 (775) 882-5117?office (775) 720-6020?mobile s.hanselman@...
a Service Disabled, Veteran Owned Small Business DISCLAIMER: This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.
On Mar 21, 2019, at 20:33, rpoz28cam via Groups.Io <rpoz28cam@...> wrote:
I am in need of a HP 5086-7592 Yig oscillator.? I have found many on Ebay but figure with the nature of these things I could end up with a part no better than what I have.? Any advice would be greatly appreciated.
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Re: Replacement battery for 8566A
Yup, that's the one, not as nicely made as the HP original but it dropped straight in and is still running! I'm not using the 8566A as much as I was these days so I find I need to fire it up for a few hours each week to keep the battery topped up but it does the job. Modifying it so it charges in 'standby' has been on my list for a few years ... I'll get there one day....!
Adrian
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On 3/22/2019 9:18 PM, [email protected] wrote: Thanks everyone who replied. Is this the listing?
Sean
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The users guide says:?Setting Display Intensity To adjust the intensity of the display, press and rotate the front panel knob, use the ( ) ( ) keys, or use the numerical keypad to set the intensity value between 50 and 100 percent. Lowering the intensity may prolong the life of the LCD.
Stuart K6YAZ
Los Angeles, CA
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