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- HP-Agilent-Keysight-Equipment
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Re: HP items for sale
开云体育Hello, no problem. If you ever change your mind let me know With best regards Tam Hanna --- NEW: Enjoy electronics? Like seeing oscilloscopes get repaired? Please subscribe to my new YouTube channel -> On 16.10.2017 21:01,
hp_ciscovss@... [hp_agilent_equipment] wrote:
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Re: 3585B Spectrum Analyzer
So far I've removed all the boards I could that were relatively easy.? I have not touched the ones that are under a metal panel identified as A and then a number. A31 or A32 for example.
I'm no longer getting the several beeps sequence as before so something has changed. Noticed after examining the power supple boards. However the alphanumerics still do not display and the flashing dot on the screen remains. No burnt components were noticed when examining the boards or even a hint that something was askew. So, on to the next phase but that will be tomorrow. thanks, Peter ve3poa? |
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Re: Plan to deep cleaning my gear
开云体育?????? You have not said what equipment you want to clean. It does make a difference. I have detailed the method of washing employed at the -hp- service center a great many years ago but this was used on what are now antiques. I will repeat it for any interested. We used liquid dishwashing detergent diluted in warm water in a paint spray gun.?????? For the residue of cal tags and property tags WD-40 works pretty well as does hand cleaner. Naphtha may work and usually does not attack paint. Ronsonol is pretty pure and does not leave a residue, I use it for cleaning camera shutters but canned naphtha is cheaper and probably works as well. I would be careful of the "all purpose" solvents now sold to replace naphtha, MEK, acetone, etc. It really can't and may attack some items naphtha does not. ?????? If you clean a chassis by spraying and rinsing it really must be baked out. We used a ventilated electric oven at 130F for at least two days and I preferred to let things cook for longer if possible.??? Make sure to remove any parts that are water or heat sensitive. On 10/16/2017 12:37 PM, Daun Yeagley
daun@... [hp_agilent_equipment] wrote:
I find that Ronson lighter fluid, which is just naptha works very well.??? This includes not only label goo, but a wide range of "dirt".??? It's mild and doesn't hurt plastics (at least not any that I've come across).??? I keep it right there on my bench and use it for most cleaning jobs, including also flux removal. -- Richard Knoppow dickburk@... WB6KBL |
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Re: Plan to deep cleaning my gear
开云体育I find that Ronson lighter fluid, which is just naptha works very well.? This includes not only label goo, but a wide range of "dirt".? It's mild and doesn't hurt plastics (at least not any that I've come across).? I keep it right there on my bench and use it for most cleaning jobs, including also flux removal.Daun Daun E. Yeagley, II, N8ASB
On 10/16/2017 1:39 PM,
guancalvin@... [hp_agilent_equipment] wrote:
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Re: Plan to deep cleaning my gear
The only thing I'd wash with water and soap is the front panel itself (completely removed from the instrument, and any pcbs or wiring harnesses removed from it), any knobs once removed from the pots, and possibly the rubberized keyboard membrane (if applicable) after removed from the backing pcb. They come out like brand new using hot-ish water, manual dishwashing soap (palmolive, dawn, etc), and if necessary an old toothbrush or larger scrub brush (with very soft bristles). For anything else, I'd just use compressed air to remove as much dust as possible and stop there. On Mon, Oct 16, 2017 at 10:39 AM, guancalvin@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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Re: YIG device failure modes
Tobias,
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The main coil is for pretune -- which brings the center frequency of the YTO to the YTO PLL's capturing range which is usually +/- 20~30mhz around the CF. The FM coil is used to perform the phase locking. HP also feeds LF from the loop filter to the main coil path to help DC tracking and pretune. I would worry more about the FM coil's tuning sensitivity and modulation bandwidth which have great effects on the closed loop dynamic. The tuning sensitivity is easy to measure yourself but the modulation bandwidth is not. The idea is to make sure the FM bandwidth (which translates to a pole in the open loop transfer function), is 10 times higher than the PLL's open loop bandwidth. Good luck! Calvin ---In hp_agilent_equipment@..., <tobias.pluess@...> wrote :
Jeff, re-fitting a different YIG was an option which I was thinking about when I repaired my 8341A sweeper. The YIG is a 5086-7323 which operates from 2.3 to 7GHz and tuning coil sensitivity is 24mA/GHz. However, I wonder how accurate those 24mA/GHz are. For
instance, if I fitted another YIG with 20mA/GHz, would that work as well? the YO driver used can be calibrated for offset and gain... Have you ever fitted a replacement YIG? What about those SYTMs HP has used sometimes (switchable YIG tuned multiplier)? is there any replacement? And do you have an idea what the reason could be for the semiconductor to fail? assuming the operating voltages were ok, is there some chemical aging process or so which destroys the semiconductor some day? because there are instruments which are 30 yrs
old and still working, but the older they get the more difficult it will be to find spare parts I guess; if the YIG fails and cannot be replaced, the whole instrument is nothing more than a really heavy paperweight.... Tobias HB9FSX -------- Original message -------- From: "kmec@... [hp_agilent_equipment]" <hp_agilent_equipment@...> Date: 10/16/17 06:01 (GMT+01:00) To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] YIG device failure modes ? I have tested several hundred YIG devices over my career. (Have drawers full of them, its a sickness)? I have seen more misaligned YIG support rods or bad oscillator semiconductors than I have seen bad coils. ? Sometimes the coil connection fails at the solder point due to wire wrap/crimp failure and current heating the joint, eventually it opens, have fixed three like this. Some model YIGs have high coil current and if poorly cooled/heatsunk, the enamel insulation
seems to fail and create a sorted coil. Only have seen one like this, but opened it up and figured out the failure. ? Other times, the polystyrene rod that holds the YIG sphere warps & twists over time from heat?& general plasticizer failure?and misaligns the magnetic axis of the sphere with the field, pretty tough to fix this, major cause of holes and high end tailing
off. And, of course, when the semiconductor device fails (Gunn diode in older X band and up, Bipolar thru 12 GHz for old ones, FET now), you are done. ? It is possible to re-fit different YIGs into various pieces of gear, but re-scaling the drivers to the right coil sensitivities can be challenging/time-consuming. ? The worst thing to deal with is the wideband? YIG tuned multipliers. Never had much luck bringing these back to life once they go south. ? YMMV Jeff Kruth WA3ZKR ? In a message dated 10/15/2017 1:40:13 P.M. Eastern Daylight Time, hp_agilent_equipment@... writes: ? |
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Re: Plan to deep cleaning my gear
Thank a lot for all your inputs guys! My instruments work very well for their age. I just wanted to make them great again:)
After reading your posts, I figured I will stay away from using any liquid or solvent for PCB cleaning. I would just? use electronics grade gas duster to blow dust off the surface of the boards. Or a small vacuum and a high quality horse hair brush would work better?? ? ?I was under impression that excessive dust would pick up moisture that would damage my equipments. Is that true? For some very old and dry sticker residue on the front panel, how should I safely remove them? I have Goo Gone but don't know if it's safe for instrument. It's kind of oily. Thanks again! Calvin? |
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Re: Question about HP3586B and measuring Power.
Tom Miller
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The 3596 was used to measure carrier levels in a multiplexed
system at 75 ohms. The 75 ohm input would be used to terminate a 75 ohm output
directly. The 10k input would have been used to bridge a terminated output to
make the same measurement. One place this would be done would be in a analog
multichannel SSB microwave baseband system.
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Question about HP3586B and measuring Power.
One of the inputs on the 3596B is a 75ohm, another is a 10k ohm//50pf.
?I can understand with a Voltage across a 75 ohm resistor how? to get a power reading. What happens when you switch the unit to 10k ohms. Does it start measuring Voltage across a 10k, and do that calculation. ?The question arose when as? practice for OpenOffice I thought I'd calculate how the power reading misbehaves, if I terminate the input with 50 ohms and measure a fixed voltage from 1MHz to 32MHz. ?The 50pf throws a changing impedance in the mix. In OpenOffice I combined 50ohms, 10k ohms and the 50pf cap impedance to get a total impedance over the frequency span. Then when I went to calculate power, I didn't know where the machine would be referenced. ?Please note, my concern is not really to do the measurement this way is is just an exercise to practice OpenOffice and draw a graph of the error. |
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Re: Plan to deep cleaning my gear
I keep hearing folks here mentioning water penetration
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of circuit board substrates, I think I can help you lay that myth firmly to rest. The process of making pcb's has always involved many long steps where the board is entirely immersed in water or water based solutions. Between each of these steps, the board is immersed in pure clean water as the etchants, and plating solutions are rinsed off of the board. One poster mentioned a board losing its high insulation value due to water washing. I think the resistance was damaged not from the water, but rather from what was in the water, and not from what soaked into the board, but rather from what was left behind on the surface of the board. Detergents come in two basic types, ionic and non ionic. Ionic based surfactants are great cleaners, but are also highly conductive of electricity. If not rinsed fully, they leave a conductive film. This film is often used to dissipate static charge from plastic surfaces, like meter windows. Also, not all water is equal. Hard waters, and acid neutralized waters, have high mineral content, which is in the form of salts. If the water is allowed to evaporate on the board, it will leave a conductive residue of a particularly nasty type: one that changes its resistance with ambient humidity. -Chuck Harris Adrian Nicol fenland787a@... [hp_agilent_equipment] wrote: I understand the desire to try and get the insides to look like new! Like Paul, I guess I have 50+ bits of oldish HP and Tek equipment, but I'm not sure I would do what you intend, especially with water! |
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Re: HP items for sale
Hello,
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sorry for being a bit slow to respond here. The Fluke313 Sounds interesting - would you be willing to ship it inside the USA to a freight forwarder? --- With best regards Tam HANNA (emailing on a BlackBerry PRIV) Enjoy electronics? Join 6500 other followers by visiting the Crazy Electronics Lab at Am 15. Oktober 2017 22:25:42 MESZ schrieb "Frank Hughes hp_ciscovss@... [hp_agilent_equipment]" : ? |
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Re: Plan to deep cleaning my gear
I had to remove BI/Beckman trimpots from our products at somewhere around 2000 because they would fail after the boards were cleaned. We switched to Bourns, and the problem went away. BI denied that they had a problem, but later they acknowledged that their O-rings were defective as they tried to lure us back.
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We used an industrial circuit board cleaner, with a citrus based solvent that was diluted with water. This was followed by an overnight bake in a 105°F dryer. -----Original Message-----
From: "Mark Goldberg marklgoldberg@... [hp_agilent_equipment]" <hp_agilent_equipment@...> Michael A. Terrell |
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Re: Plan to deep cleaning my gear
I agree with this. I have been involved in many product developments over 40 years ( not for HP) and would not use anything but >99% IPA or DI water, and only if the parts are rated to be cleaned with these solutions. If you don't know if they are rated, they may be damaged. Some trimpots, connectors, etc may not be cleanable without damage. The industry did use Acetone and Freons, but due to safety reasons, those are much less common now. Mark On Oct 16, 2017 5:48 AM, "Adrian Nicol fenland787a@... [hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:
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Re: Plan to deep cleaning my gear
Adrian Nicol
I understand the desire to try and get the insides to look like new! Like Paul, I guess I have 50+ bits of oldish HP and Tek equipment, but I'm not sure I would do what you intend, especially with water! I recall that in the 60's through to the early 80's water washable fluxes were not necessarily used and PCBs were often expected to be cleaned with CFCs (ICI Arklone and the like) to get the rosin based fluxes off, so some components were not sealed and not meant to get wet! Early PCBs often meant for hand assembly did not have a solder resist either so there may be a small risk of moisture penetration of the FR4? I clean things that need it, suspect areas of PCBs due to contamination, old flux from re-work, switches and so on with IPA, dust I blow off with the shop airline, case parts, yes soap, water and brush (and solvent where safe and needed for sticker residue) but the 'aint broke don't fix' mantra is my guide! On Monday, October 16, 2017 5:26 AM, "Calvin Guan guancalvin@... [hp_agilent_equipment]" wrote:
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Hi,
I am thinking of deep cleaning of my gear. 8566 SA, 8510 VNA, 8515A S-parameter test set, 8350/83592 sweeper. I think I am going to remove all PCBs, soak them into clean water, brush them and dry them with hair dryer as soon as I can. For delicate microwave assemblies like DC, YIG, YTFM, mixer and ovenized crystal, and CRT display, I will just brush dirt off the surface and leave them alone. For sticky keys, soak the keyboard assembly into IPA, rinse them and dry them as quickly as I could. Sounds like a plan? Thank you! Calvin |
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HP 5343A S/N 2440A Service Manual
Looking for a HP 5343A Service Manual for S/N 2440A prefix. All kinds a manuals for the 2014A prefix. I am working on issues with the 10Hz to 500Hz section of my counter and the A3 Direct Counter PCBA P/N 05342-60040 is different than the information in older SM. Anyone have any information on this Counter Board. Tnx Rich KQ6EF |
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Wanted: HP1346A/HP1347A EPROMS and service manual
Hi,
Ansgar Kueckes have gotten hold of a prototype HP1347A used to produce the "NORAD" graphics for the Wargames movie, and it does not match the 1346/1347 OPM manual on Keysights homepage. For purely data-archaeological reasons, I am interested in getting hold of the contents of the ROMs on the final production version, to compare it with this prototype code, and it would also be very nice to get hold of a service manual if possible. For more info see: and: Thanks in advance, Poul-Henning |
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5342A: blown sampler?
开云体育Hi all,
one of my other projects I'm working on is a 5342A which does not count on the high frequency input. I checked the sampler according to the service manual. I used a 34401A for the resistance meausrement and got 22k in forward bias and >3M in reverse bias. This is quite different from the values stated in the service manual; however, when I look at the schematic, I think it should be possible to test the sampler with the diode test function. I did that, and I found out that in forward bias, I have approx. 0.4 volts, and reverse bias is open. So it looks like a pretty nice diode. However I cannot compare to other samplers, and the service manual also tells that the resistance measured can vary greatly if not exact 1mA measuring current is used. Does that sampler look good to you guys, or is it probably broken? because if it is broken I think it makes no sense to invest additional time to fix things. Tobias, HB9FSX |
Dave McGuire
Michael A. Terrell
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