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- HP-Agilent-Keysight-Equipment
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Re: 8662A
the VCOs are hand built and tested on the line, so they had to be
sent back into the factory for repair or replacement. through the late 90s many of the components vital to these VCOs like the glass pin diodes were becoming very difficult to find and were of poor quality. your best bet will be to try and locate another of the VCOs from a different unit. they are all identical regardless of 8662A or 8663A. each unit required an identical pair of the VCOs so there's a few of them out there to be sure. --- In hp_agilent_equipment@..., "Mike Feher" <n4fs@e...> wrote: I am trying to get my 8662A to work. I bought it knowing that it hadthe VHF (320-640 MHz) VCOs is not behaving the way it should. There are twoof these VCOs in the unit, essentially identical. They use a pair of 2N5397N channel JFETs in an oscillator and it is varactor tuned. There is no infoon them at all in the manuals as it is a factory repair part only. I wonder ifany one on here has any experience with them that they could share. Thanks -Mike
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Re: HP 54200A Manual
Bob Japundza
I would have to say that if you can't fix it with conventional
troubleshooting techinques (looking for bad caps, diodes, etc. in a particular section) then you may as well just find a new one, I picked my 54200a up for $75, in good shape. Regards, Bob --- In hp_agilent_equipment@..., Sam Reaves <sreaves@v...> wrote: Dave,manuals do not have any schematics in them and the instruments have a lot ofcustom IC's in them. The service manual will get you down to a board for which HPhas (or should I say had) an exchange price your bad board for a goodboard. I have a HP 54503A that has a problem with the main board and HP wanted a$2500.00 exchange price for the board which is way more than the scope isworth. on CD. I have gotten many manuals from him and they are good quality scans._____________________________________________________________________ ___ _____________________________________________________________________ ___ for an likeoriginal) it's a bit steep for me. I have a dead 54200A here I'd manual Ito get running again. point memay be missing some details on features. Can anyone here manual?to a free or purchasable pdf version of the programming/user _____________________________________________________________________ ___ _____________________________________________________________________ ___ ------- -------Yahoo! Groups Links |
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Re: HP 54200A Manual
Dave Brown
Sam
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Tks for the info re Dave Miller. Comments re possible issues with the 54200A noted. For some time the scope was powering on OK but failing POST. Still worked OK-, albeit with suspect cal. Not used it for nearly a year, and now it just won't power on at all. Possibly a power supply issue I guess but I need to have more info to start diving inside with some degree of 'comfort'! 73 Dave, ZL3FJ ----- Original Message -----
From: "Sam Reaves" <sreaves@...> To: <hp_agilent_equipment@...> Sent: Thursday, October 28, 2004 1:09 PM Subject: [hp_agilent_equipment] Re:HP 54200A Manual
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Re: HP 54200A Manual
Sam Reaves
Dave,
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One caution on the manuals for the 54XXX scopes. The service manuals do not have any schematics in them and the instruments have a lot of custom IC's in them. The service manual will get you down to a board for which HP has (or should I say had) an exchange price your bad board for a good board. I have a HP 54503A that has a problem with the main board and HP wanted a $2500.00 exchange price for the board which is way more than the scope is worth. If you really want a manual contact Dave Miller AA4DF for a copy on CD. I have gotten many manuals from him and they are good quality scans. see: Sam W3OHM hp_agilent_equipment@... wrote:
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Re: 54200A manual
Thomas Fowler
Great! Let me know how it works.
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At 03:40 PM 10/27/2004, you wrote:
Thomas, I found a original manual on ebay for $45. |
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Re: 54200A manual
Bob Japundza
Thomas, I found a original manual on ebay for $45.
BTW, I have a NI GPIB card somewhere, I may give your 54200A utility a try. Regards, Bob --- In hp_agilent_equipment@..., Thomas Fowler <tfowler@m...> wrote: Bob--finally tracked one down (xeroxed) from an outfit in Italy that handlesthe scope a while back so I don't have anything to lend you.manual I manual?may be missing some details on features. Can anyone here point me
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Re: 54200A manual
Dave Brown
Bob
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They seem to be hard to find-at a reasonable price- I think manualsplus have one listed but at 70 dollars for a copy (more for an original) it's a bit steep for me. I have a dead 54200A here I'd like to get running again. DaveB, NZ ----- Original Message -----
From: "Bob Japundza" <bjapundza@...> To: <hp_agilent_equipment@...> Sent: Wednesday, October 27, 2004 7:19 AM Subject: [hp_agilent_equipment] 54200A manual
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Re: 54200A manual
Thomas Fowler
Bob--
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I had one of those scopes. Finding a manual was really tough--I finally tracked one down (xeroxed) from an outfit in Italy that handles manuals. But it wasn't free--cost about $60 as I recall. I sold the scope a while back so I don't have anything to lend you. At 02:19 PM 10/26/2004, you wrote:
Hi All, |
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54200A manual
Bob Japundza
Hi All,
I just purchased a 54200A scope and have figured out how to generally work the scope but I'm sure that if I don't get a manual I may be missing some details on features. Can anyone here point me to a free or purchasable pdf version of the programming/user manual? Thanks in advance, Bob |
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8153A power up question
phila_renewal
Hi group:
I was lucky enough (?) to obtain a pile of HP 8153A lightwave multimeters in a pile of other equipment -- but no plugins. They do not give any display, and since I have so many of them all identical, my assumption is that it is "normal" for them to not give a display without a plug-in. I'm eBaying them now "as-is" (gotta clear some space and fund other endeavors) and someone suggested they should give a display even without a plug-in. I don't want to sell any "junk" without full disclosure (not my cup of tea -- I've been burned myself so many times buying equipment off of eBay that I know only too well what it's like) so I need your collective experience on this. Can anyone tell me for sure -- should an HP 8153A do anything on turn-on if it has no plug-in in one of its bays? Thanks to all, -Keith |
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Re: HP 355C VHF Attenuator
Dan Tulloss
¿ªÔÆÌåÓý?
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Re: HP 355C VHF Attenuator
¿ªÔÆÌåÓýWhy
not try DeOxit and Pro Gold first?
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HP 355C VHF Attenuator
Gentlemen,
I just received a 355C attenuator I won on ebay. When put to the test the attenuation is all over the place. Traced the faults to two of the micro switches. When closed the contact resistances varies from several ohms to open circuit depending on the number of times I rock the switch. I don't have any documentation on the unit so can't quote the part numbers. One most likely could not afford the genuine HP part anyway. Does any one know of a replacement part for these micro switches? Thanks David David Hopkins (VK4ZF) Queensland AUSTRALIA davhop@... S 27, 22.294 E153, 11.008 |
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Re: Digest Number 197
Rick,
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I am not familiar with these particular supplies, but I have found that with the HP/Harrison supplies (such as the 6200, 6286, ...) there is a serious fooboo in the drive circuitry for the power transistors. The supply is designed to be able to pull both up and down. If the supply is driving a large capacitor, or perish the thought, a sealed lead acid battery, the predriver transistors will croak instantly if the supply is asked to supply a voltage that is less than that on the terminals. You might try doing a quick check on the transistors that drive the pass transistors. -Chuck Harris Dave Haupt wrote: Rick, |
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Re: Digest Number 197
Dave Haupt
Rick,
Is is possible that these power supplies use remote sensing? If so, you need to connect the output terminals to the sense terminals. If these are not connected, many power supplies will immediately go to full voltage, but lab grade supplies usually have a sensing system to detect the absence of the connection, and send the voltage to zero. Hope this is helpful, Dave W8NF Santa Rosa, CA Date: Tue, 19 Oct 2004 06:43:11 -0500 From: "Richie Thompson" <radiorick@...> Subject: HP 6263B and 6267B power supply problems Good morning, I recently bought three HP power supplies, the 6263B and the 6267B and all experiencing the same problem. I do not get any voltage out of them; I was wondering if there is some trick I don't know about. I do have the operating / service manual. These do not have the built in variable pot. So, I have to wire them with "resistance programming of output voltage" as seen on fig 3-4. I am using a 1000 ohm resistor for my programming resistor that should produce 5 volts (200 ohm per volt calculation) I am using a 520 ohm load resistor. When I turn the power off, I see the volt meter needle rise then bleed off. Any ideas on what I may be overlooking? This is my first time playing with this programming of output voltage type. Thanks, Rick T _______________________________ Do you Yahoo!? Express yourself with Y! Messenger! Free. Download now. |
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HP 6263B and 6267B power supply problems
Richie Thompson
¿ªÔÆÌåÓýGood morning, I recently bought three HP power supplies, the 6263B and the 6267B and all experiencing the same problem. I do not get any voltage out of them; I was wondering if there is some trick I don¡¯t know about. ? I do have the operating / service manual. ? These do not have the built in variable pot. So, I have to wire them with ¡°resistance programming of output voltage¡± as seen on fig 3-4. ? I am using a 1000 ohm resistor for my programming resistor that should produce 5 volts (200 ohm per volt calculation) ? I am using a 520 ohm load resistor. ? When I turn the power off, I see the volt meter needle rise then bleed off. ? Any ideas on what I may be overlooking? This is my first time playing with this programming of output voltage type. ? Thanks, Rick T ? |
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Wanted: op instructions for HP5302A counter
emailw8nf
I'm going to be using this beast for event counting. Would be
interested in operation instructions, or tips. Prefer, naturally, a manual - paper, electronic, whatever. But if someone can simply say "just push these buttons and it'll self-arm and go", then that's adequate. TIA Dave W8NF |
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Re: [Test-Equipment] HP 8620 help
It would be far cheaper to look for some old telephone
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connectors. There are probably dozens of scrap cables and connectors laying on the ceiling tiles of the office where you work... obsoleted when industry switched over to CAT5. The phone guys never take that stuff out unless they are forced to. -Chuck John Miles wrote: Thanks for the confirmation on the physical connector type, guys. I'll go |
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Re: [Test-Equipment] HP 8620 help
John Miles
Thanks for the confirmation on the physical connector type, guys. I'll go
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ahead and buy some SCSI interconnects. I am hoping to come up with a PC interface to these units, complete with phase-locking. Going to need access to the back connector to pretune the plugin and detect what band is selected. -- john KE5FX I am looking to do some interfacing to the 50-pin connector on |
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