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Re: HP8755B SWEPT AMPLITUDE ANALYSER -- parting out
oldtestgear
Got this today -- it is in pretty good condition apart from 2 of the lever switches which are damaged but appear to work. If no one wants any of it this week it is off to the tip. Seems a shame but I don't have room for another orphan piece of kit.
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Phil. --- In hp_agilent_equipment@..., "oldtestgear" <philip.parsons@...> wrote:
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Re: FS: Micronetics M3500-0916S VCO 900-1600MHz
hi pete
im interrest for some can you pls give me yr personal e mail thanks samir From: Peter Loron Sent: Tuesday, October 06, 2009 8:02 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] FS: Micronetics M3500-0916S VCO 900-1600MHz I have a large lot of new Micronetics M3500-0916S surface mount VCO modules, 900-1600MHz available for sale. Asking $3 each. -Pete |
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Re: HP5343A counter
Peter Manfre
Good counter...I have 2 for sale 1 working and one for parts (only needs
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sampler to be good). Pete WA2ODO Steve wrote:
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Re: HP5343A counter
Luis Cupido
Excellent counter if you are interested
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in microwaves. No false locks not easily mistaken by FM or unstable sources, very sensitive and easy to maintain. If you're after lower freq's <1GHz. this is not the best one you could get (on universal counters you have much better). Luis Cupido ct1dmk. Steve wrote: Anyone have experience -- good or bad -- with the HP5343A counter? |
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HP5343A counter
Steve
Anyone have experience -- good or bad -- with the HP5343A counter?
Thinking about acquiring one. The specs indicate it will meet my needs. Just wondering if anyone out there has hands-on experience with this model and what you thought of it. Thanks. Steve K8JQ -- Read The Patriot Post hppt://PatriotPost.US/Subscribe/ Vertitas vos Liberabit |
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Re: Worried about 141T
This would be my guess as well. Fuses do regularly fail from fatigue, and
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I've even manage to collect (and "fix") numerous items because of that. Look carefully at the blown fuse, and if it visually looks pretty good, with perhaps a visible hairline break, that's likely the cause. However, if you see signs of melting, like small blobs on the open ends, or signs of metal deposition on the walls, I'd be concerned that there was a "real" failure. Daun _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of J. Forster Sent: Tuesday, October 06, 2009 1:00 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] Re: Worried about 141T In college, I was interested in building high power audio amps. (I have since outgrown such foolishness). Anyway, big power transistors were EXPENSIVE, like $30 in the late 1960s... a LOT of money. To avoid frying them, I fused the circuit w/ 3AG fuses. That worked fine, but every so often a fuse would blow w/o explaination. I chased this for days w/o success. Eventually, I was testing the thing from a low freqency sine generator at a Hz or two and I noticed the fuse wire was alternately heating (and bowing) then cooling (and straightning), and deduced they were failing by metal fatigue. The same thing could be happnng here. When the unit is turned on, the fuse may briefly heat and then cool... eventuall leading to a fatigue failure at some random time, for no apparent cause. FWIW, -John ================= Eventually both fuses of the IF section had blown as a matter ofSince you're very close to the transformer substation, you probably |
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Re: Question RE: Hp1631D GPIB
ve7ebr
Hi,
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Looking at page 10-5 of the 1631D manual, what you are saying about sending back the data is my understanding as well. It could be a manual typo. in the format of the reply. A few moons ago, I peeked at the fw. code in the ROMs of my 1631D and have labelled quite a few things. I have the command dispatch table for example and a few other routines labeled (try the undocumented HPIB revision command "RV" for fun). Anyway, the information in my file might be of help in your situation as I have the command "TT" broken down. What kind of control program are you writing, if I may ask? Regards, -Benoit --- In hp_agilent_equipment@..., "stychokiller" <jimbot@...> wrote:
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Re: Worried about 141T
J. Forster
In college, I was interested in building high power audio amps. (I have
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since outgrown such foolishness). Anyway, big power transistors were EXPENSIVE, like $30 in the late 1960s... a LOT of money. To avoid frying them, I fused the circuit w/ 3AG fuses. That worked fine, but every so often a fuse would blow w/o explaination. I chased this for days w/o success. Eventually, I was testing the thing from a low freqency sine generator at a Hz or two and I noticed the fuse wire was alternately heating (and bowing) then cooling (and straightning), and deduced they were failing by metal fatigue. The same thing could be happnng here. When the unit is turned on, the fuse may briefly heat and then cool... eventuall leading to a fatigue failure at some random time, for no apparent cause. FWIW, -John ================= Eventually both fuses of the IF section had blown as a matter ofSince you're very close to the transformer substation, you probably |
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Re: Worried about 141T
Eventually both fuses of the IF section had blown as a matter of surge protection. My house is right next to a transformer site from the electrical regulator (20.000V transformed downto 220V) and our power supply in the house is quite unstable.Since you're very close to the transformer substation, you probably have the best (lowest impedance / highest voltage / best stability) power available on that circuit. People downstream from you only have it worse. Or, in other words, I fail to see how being close to the transformer makes the power supply in your house "unstable" -- on the contrary, your "predicament" is usually desirable! I'd argue that you don't really know what caused the fuses to blow. I suspect that unless you completely clear the reference circuit as pointed out by Chris Trask/Al Jamison in their posts, that's still suspect. It must be a common failure mode. I don't know what supply a 141T uses, but I have never ever had fuses blow in otherwise in spec equipment blow due to a surge other than nearby lightning hit. If the fuses blow on rather commonplace power line voltage fluctuations, then either the design choices for the fuses (or other things) were wrong from day one, or something in your equipment is consuming too much power -- either in normal operation, or on during startup transients. Cheers, Kuba |
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3585B - LO unlocked - repair history
Hi all,
Just wanted to share my repair efforts on my HP3585: error on display: "Local osc unlocked" + beep The LED's on the A34 board pointed A27 as the first thing to look at. I found there was an error in the switching between single loop and multiple loop (SL /ML). However the cause turned out to be on the A28 board. U3 is a quad comparator LM339 that failed to convert the levels towards the A27 board. After replacement of the LM339, everything is fine again. I found out that it is much faster to analyze the LED's and look for the boards that are pointed to. Using the troubleshooting diagrams in the manual for section B is very very time consuming and in my case pointed to some other things. Also be careful when removing / inserting the SMB cables on top of the B section boards. I destroyed a SMB male pin and had to replace the connector... Is my second repair... a first problem was no HV present (4 and 12kV) which I reported in an earlier mail. Luckily the HP3585B CRT is still in excellent shape and is very bright and sharp. Hope I can enjoy the instrument further. regards from Mike |
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Question RE: Hp1631D GPIB
I'm currently writing a program to control my Hp1631D Logic Analyzer.
When I send the TA;, TS; or TT; commands, the returned data always contains a CRC and Revision Code value of 0. Does anyone know if this is correct behavior or whether the Manual is erroneous about where in the data the CRC and RevCode fields are located? According to the manual, I should be able to just send whatever the Analyzer gave me back through the GPIB bus and have the Analyzer reinstate the settings it's been given. I'm under the impression that the Analyzer will try to verify the CRC that it receives, so the CRC has to be correct (or is this an invalid assumption?). |
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HP8657B problem
Steve
I have an HP8657B that has developed an odd behavior. Perhaps someone on the list can advise me as to what is going on.
There is a dip in the output level that centers around 53.5MHz. Using 10MHz as a reference, the output drops about 12dB at 53.5MHz. The falloff in level begins around 40MHz, bottoms out at 53.5MHz and is back to normal at about 70MHz. I have observed this output "hole" on two power meters, both of which work OK on an HP8657A. Is there a cockpit error that can cause this "hole" in the HP8657B's output? Or is there a known failure mode that can cause it? Other thoughts? Thanks. Steve K8JQ -- Read The Patriot Post hppt://PatriotPost.US/Subscribe/ Vertitas vos Liberabit |
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Re: 8640 powerdoubler
Greg,
Could you explain a bit more about how you would make gears for the 8640. I understand the cracking is a rather common problem. Mine has cracks but is still holding together and functioning. That said, a spare set of gears would be a good investment should bad things happen. Walter From: tmsteal Sent: Sunday, October 04, 2009 9:29 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Re: 8640 powerdoubler Greg, I would be intersted in two sets of gears if available. Let me know. Thanks --- In hp_agilent_equipment@..., Greg Bowne <gbowne1@...> wrote:
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Re: WTB 8753C Power Supply Module
STEVE REEVES
John,
Please contact me - I have a working one. Steve ________________________________ From: oh8nj2001 <jahla@...> To: hp_agilent_equipment@... Sent: Saturday, October 3, 2009 4:21:19 PM Subject: Re: [hp_agilent_equipment]WTB 8753C Power Supply Module ? Hi John According to Google there seem to be several sources for 08753-60098. Also might want to contact . ebay.com/ yixunhk/ - I have managed to get some 8753 parts from them. 73, Jaakko oh8nj --- In hp_agilent_equipmen t@yahoogroups. com, "jbarnes" <jbarnes@... > wrote:
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Re: HP-182C repair
Hi Paul,
On 10/5/09, Paul Read <paulr@...> wrote: Yes, this has been suggested also by others. The shield should be non magnetic, but I have to test it. The other only option is that someone placed a magnet between the shield and the CRT. I have to inspect it. But this seems higly unlikely :-) Thanks and best regards. Francesco |
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Re: HP-182C repair
Paul Read
Hi Francesco and Guys,
I just had a look at the uploaded image, my first reaction was "there's magnet somewhere near", is it possible that a general De-gauss might help. I know that the main chassis is all aluminium, and all the bits inside the CRT should be non magnetic...but you never know. Best of luck. Kind regards Paul [cid:image001.jpg@...] Paul Read RF Engineer Ext: 235 Wood & Douglas Ltd Lattice House Baughurst Tadley Hants RG26 5LP United Kingdom Tel : +44 (0) 118 981 1444 Fax: +44 (0) 118 981 1567 www.woodanddouglas.co.uk<> www.cofdm.com<> This e-mail and any attachments are confidential and may contain information that is legally privileged. If you are not the named recipient, or responsible for delivering the message to the named recipient, you must not disclose, distribute, forward, copy, store or use this e-mail or its attachments in any form. If you have received this communication in error, please accept our apologies and promptly inform the sender by e-mail or by telephoning 0118 981 1444. Please also immediately delete this message and any attachments from your systems. Although this e-mail and its attachments have been checked by an up-to-date virus-checking program before transmission, Wood & Douglas Ltd cannot accept liability for any damage sustained as a result of software viruses that maybe present. Wood & Douglas collect and monitor all outgoing and incoming e-mails and other telecommunications on its e-mail and telecommunications systems. Registered Office: Lattice House, Baughurst, Hants, RG26 5LP Registration No: 2844692 |
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Re: 8640 powerdoubler
Greg,
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I would be intersted in two sets of gears if available. Let me know. Thanks --- In hp_agilent_equipment@..., Greg Bowne <gbowne1@...> wrote:
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