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86603 attenuator blowing fuse
My 86003 2.6 GHz RF section is blowing the fuse in the main frame - I think it's the -21 volt supply. The unit contains a 86601-60142 attenuator which is to be used with the 86603-60065 driver board, which is present. This attenuator and driver board do not match the information in the manual. The attenuator in the manual switches diodes along with the attenuator to turn the relay off as soon as it switches. This unit does not have diodes, so I assume the driver board applies a short pulse to switch the relay, or perhaps drops the current after switching.?
Does anyone have information on this driver board? Thanks, Gary Appel |
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Re: HP8595A firmware request
Angelo> My HP8595A spectrum analyser is stuck because of corrupted firmware on EPROM.? Could anybody please help?
Have you tried searching for the HP part numbers labeled on the EPROMs on the processor board?? There should be four socketed EPROMs (or possibly two if it's really old), and would have numbers like 5181-xxxx or 08590-xxxxx. Steve> I have an 8595E if that helps. I'm reluctant to open it up as it's working fine. Is there a way to dump the EEPROMs via GPIB etc? To save you some trouble, there are already EPROM images for the 859xE series available on ko4bb.com, but I don't know if they will work on a 8595A. To answer your question, you can dump anything in the processor's address space with these GPIB commands: ? /g/HP-Agilent-Keysight-equipment/message/103548 The EPROM occupies an address range starting at 0x000000.? It's possible it shows up at other addresses too, but that's where the initial vector table resides so it at least has to be there. -mark |
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Re: Historical question¡ªHP frequency standards
Jeremy went through hp catalogs from 1943 to 1968 and provided this chart:
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One of the questions he and I have at this point is not so much which versions of the hp 100 exist or when they were for sale, but what series numbers exist and how many of each were produced. Now and then on the 'net I've seen comments about hp production quantity -- by hp itself or by retired hp insiders. I'm not sure where that kind of information comes from, but it's interesting from a collectors point of view. /tvb On 3/1/2021 10:10 AM, Patrick Manning wrote:
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Re: [hp_agilent_equipment] GPIB-USB Controller
Thank you, Thomas.? I'm very sorry to learn that sad news. Thanks for the offer to share code. Have you have a chance to look for your code? Thanks for your help. Eric
On Thursday, October 29, 2020, 05:12:33 AM CDT, Thomas S. Knutsen <la3pna@...> wrote:
Jack passed away in september 2019.?? I have some EZ-GPIB code for 8568B, its so close it usually?works on?the 8566. I will share it?when I get home from work today.? ?Agilent 82357B can be used, but you have to use the VISA drivers.? BR? Thomas. tor. 29. okt. 2020 kl. 02:59 skrev Eric via <neutron68=[email protected]>:
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With Best regards, Thomas S. Knutsen. ?Please? avoid sending? me? Word? or? PowerPoint? attachments. |
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Re: Historical question¡ªHP frequency standards
Jeremy - I just dug through my catalogs looking at the 100E.? It last appeared in the 1967 catalog, though from '65 on it appears that it had become kind of an also-ran, no longer rating a picture and being mentioned only briefly on the 106A/B 107 AR/BR page in a brief paragraph listing some quick specs and the price ($1100 in 1968).? I wouldn't be terribly surprised to find that 116- was its final engineering revision. -Pat On March 1, 2021 at 11:02 AM Jeremy Nichols <jn6wfo@...> wrote:
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Re: HP 8901B/8902A History
Mike, this would have been in the mid-1970s and yes, it was a lot of work, a lot of money to do a run for just a few chips. That¡¯s why it stuck in my memory.? On Mon, Mar 1, 2021 at 7:16 AM Mike Vande Voort <mike@...> wrote:
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Jeremy Nichols 6. |
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Re: Historical question¡ªHP frequency standards
Patrick, thank you for that bit of data. My 100E is also a 116. I¡¯ve not yet found any 100Es with another serial prefix but it¡¯s early days yet.? On Mon, Mar 1, 2021 at 12:39 AM Patrick Manning <pbmanning@...> wrote:
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Jeremy Nichols 6. |
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8640B output switch
I have two 8640B's that work well.? One has a typical output selector but the other one is auto ranging.? I think that is what it is called.? If on the 10 range and then reduce output with the vernier the output automatically switches to the 3 range when output drops below 3.? A little confusing for me the first time I came across that.? My question has to do with the background behind the output selector dial.? There is a vertical line which indicates the output range selected but adjacent to that is a wide arc for about 20 degrees followed by a thin line for another 20 degrees or so.? What do those arcs designate?? I've looked at the operators and service manuals but can't find any info.
Thanks, Bill A |
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Re: HP 8901B/8902A History
¿ªÔÆÌåÓýwas this before FPGAs and the like ? ? a lot of steps to ¡°cook¡± up a batch of IC¡¯s I would expect, and not all of them survive the birthing process ? From: [email protected] <[email protected]> On Behalf Of Jeremy Nichols ? ¡°About 100¡± is what my memory says.? ? ? ? On Sun, Feb 28, 2021 at 1:58 PM Mike Vande Voort <mike@...> wrote:
-- Jeremy Nichols |
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Re: Old HP 8558B spectral analyzer
Don, and others
Thank's for your answer First my native language is the French, so i use reverso to translate. My oscilloscope is a HP182T (i bought the hp182T + spectral analyzer HP 8558b on ey) I know they broke down, but I got a good price on E..y. The HP182 now works, there was only one Zener "burn" So there is some confusion for the word display. The problem is on the displays?above the reference level and freq span button (the four "digits") on the spectral analyzer. (see picture) No frequency on display. they are "black". to understand what I¡¯m doing, you have to watch this video first. we can test the analyzer, without putting it "plug-in" of HP182 I therefore rowed the +15v and -12.6v power supplies of the HP182 by wires directly on the analyzer. so it's open and i can see some signals with my Philips oscilloscope (the second) I did not bring back the 100v which is only used to sweep? ?horizontal the oscillo HP182.(at this time) So I was able to control various signals, the sweep (pcb A8), the meter voltage?which varies with frequency . ) (pcb A7) this famous signal meter voltage is used to display the frequency on the digits. (The pcb of the digits? is a kind of converter voltage/ displays /analogique / digital) all signals are good on this connector attached to this PCB THE BIG PROBLEM IS DOCUMENTATION I have 2 documents HP 8558-60102 (July 1985) and HP 8558-60043 (October 1977) But unfortunately, the schematics are more recent and the schematic??PCB of the displays is not the one I have see the pictures of the pcb, it¡¯s an assembly of 5 small pcb, and that¡¯s the schematic of what I need. (Here, the converter is only made with 74xxxx circuits and transistors, not with a 20-legged circuit where everything is integrated.) So you need a manual service older than 1977??? Big question. Someone have the schematic??? my serial number is 1321Axxxx see pictures: The spectral analyzer My pcb display (recto / verso) Diagram of more recent display The more recent display? I think you¡¯ve figured out that¡¯s the old schematic I need thank's for your answers ![]()
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plan version recente.GIF
decodeur dans les docs.GIF
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Re: Old HP 8558B spectral analyzer
Gerard,
What display are you using? The HP 180 series ( 180¨C184A,C,T) or the HP 853A? The 8558A has a small circuit card on the top, left, rear of the plug-in. This makes the connection for the horizontal sweep, the vertical goes through the connector on the rear. I haven¡¯t touched one of these in 30 yrs. so I may have it reversed. Determine which is at fault the display or the plug-in. Don Bitters |
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Re: Historical question¡ªHP frequency standards
Jeremy, for what it's worth, I have a 100ER; its serial number is?116-00508 so there were at least 408 of that version. -Pat On February 28, 2021 at 3:48 PM Jeremy Nichols <jn6wfo@...> wrote:
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Re: Historical question¡ªHP frequency standards
Hi Jeremy:
There might be a clue in the "Changes" part of the manual. -- Have Fun, Brooke Clarke axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it works. 2. Everybody, with no exceptions, holds false beliefs. |