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Re: 54501 Power Supply Schematic
开云体育Did we recap the fucker?
With these Boeschert cartridges, usually you need to gib the caps
first. Then, wash the remaining electrolyte from the top of the
PCB and the bottom, as the creep currents can fuck up the three
terminal regulators.
Tam With best regards Tam Hanna --- Enjoy electronics? Join 8300 other followers by visiting the Crazy Electronics Lab at On 07.10.2018 16:34, Mark Whitmore
wrote:
I need to fix a dead power supply for my HP 54501.? Is a schematic available anywhere on Earth? |
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Re: Calibration of 4285A Precision LCR meter 75 kHZ to 30 MHz. 0.1%
Dr. David Kirkby from Kirkby Microwave Ltd
On Sun, 7 Oct 2018 at 13:47, Dr. David Kirkby <drkirkby@...> wrote:
Oops, I paid $1650 (USD) for the Agilent 4285A. Add on taxes and international shipping from the USA to the UK, and it cost a fair bit of money. So its worth spending about ?250 to get it calibratied - despite I have some reservations about a calibration that does not have uncertainties. -- Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 Tel 01621-680100 / +44 1621-680100 |
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Re: Calibration of 4285A Precision LCR meter 75 kHZ to 30 MHz. 0.1%
Dr. David Kirkby from Kirkby Microwave Ltd
On Sun, 30 Sep 2018 at 23:32, Dr. David Kirkby <drkirkby@...> wrote:
I have had some sort of response from Keysight on this. "Rather than the 04285-61001 accessory we use the 100ohm resistor from a calibrated resistor set (42030A) for our testing. As the open and short from the 42030A are used during the calibration, for practical reasons it’s easy to also use the 100ohm resistor. Also, it seems it may have been an oversight on the 6 year old results that the Customer has from the US where the 20cm AIRLINE from the 16342A kit is missing from the equipment used list." It still does not explain 1) Why there is not the results from a single resistor measurement on the calibration certificate. 2) Why the 04285-61001 resistor, which was a standard accessory supplied with the LCR meter, is not calibrated. Also, Keysight in the UK can't provide a calibration with uncertainties. All the above said, my main aim is to find out if this meter is okay, since it was bought used, at a not insigificant price. (I paid ?1650 for it, plus shipping and taxes). So it is worth abut the ?250 or so to get it "calibrated", if only for the fact that the calibration should cover uncover any faults. ? Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 Tel 01621-680100 / +44 1621-680100 |
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Re: Cleaning RF bits (attenuators, connectors, etc.)
Note that for a lot of dirt the lower grades of IPA work better than pure (99.9%). Use 80% IPA for first appliaction with the 99% for the final? clean to absorb the water. You can't get IPA purer than 91% by distillation, the purer grades are dryed chemically hence the higher cost.
I find Methanol works well on the decayed foam and citrus turpene (label remover) for labels. Robert G8RPI. |
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Re: Cleaning RF bits (attenuators, connectors, etc.)
Dr. David Kirkby from Kirkby Microwave Ltd
On Sat, 6 Oct 2018, 23:30 Richard Knoppow, <dickburk@...> wrote: ? ? ? I forget the purity, but we used to buy "analytical grade" ethanol for cleaning laser lenses. That was I believe the purest form.? I have only bought "eBay grade" IPA. Sold as 99.9%, but common sense tells you it is? not. Dave.? |
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Re: Cleaning RF bits (attenuators, connectors, etc.)
I use "sticky label remover"
label remover It has a distinctive citrus smell but the main thing is that it doesn't evaporate quickly like IPA or other solvents. I apply it liberally?to a paper towel (ie wet but not dripping) and then hold the towel over the crud for a couple of minutes then wipe with the towel. It shifts pretty much all the gunk left behind by stickers and by using the wet towel method you are only applying it to the outside of the attenuator and not inside the connectors - so reducing the chances of any damage to the attenuator itself. It's safe to all the plastic connector covers I have so you can use them to further limit any accidental?ingress. The only downside is that it does leave behind a slight citrus fragrance but provided you don't have a citrus allergy this isn't a problem 73 Dave |
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Re: 85460A RF Preselector for HP 8542A EMI rcvr
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On Oct 6, 2018, at 9:34 PM, Jeff Kruth via Groups.Io <kmec@...> wrote:
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Re: OT - Fluke 8800A/8810A Handle needed
Greetings, Awile ago I did a search for the MaterialSafety Data Sheet MSDS for the plastic activator and naptha was listed. Elsware I heard alcohol can be used.
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In the case of the handle, I would probably drill or slot with a dremal on both sides of the break and epoxy a piece of steel or a couple nails into one side and let it dry. Then epoxy in the other side, keeping excess glue away from the seam edge, and putting a dab of crazy glue on the seam and stick it all back together. Excess crazy glue can be sanded or scraped of later and buffed up like new. If the handle is black, a wipe with a sharpie on the part (or sharpie the end of an exacto blade with ink and put crazy glue on the knife to apply to part). When crazy glue touches the ink it will dissolve it and black glue results. At 09:28 PM 10/06/2018, you wrote: Something like this? |
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Re: OT - Fluke 8800A/8810A Handle needed
On 10/6/2018 8:10 PM, Sam Reaves wrote:
Just received a Fluke 8810A (newer model of 8800A) Bench DMM where the handle was broken (in shipment) and nothing seems to glue it. Does anyone have a handle or a case with handle from a scrap unit they would be willing to part with? The 8800A/8810A use the same handle but it is different than the one from the more common 8000A and 8010A/12A/50A etc.Hello, Sam-- There's a blog posting here... ....And from another posting , a discussion of flame conditioning recalcitrant plastics... "... Plastics: Clean plastics, except for polycarbonate, with isopropyl alcohol to remove contamination. Sand all plastics including polycarbonate with 80-grits and paper to provide texture for good adhesion. Flame treat ABS and PVC for additional benefit. HDPE (high-density polyethylene) and LDPE (low-density polyethylene) must be flame treated for good adhesion. FLAME TREATING is a method for improving adhesion to plastics by quickly passing the flame of a propane torch across the surface after it is cleaned and sanded. Allow the blue part of the flame to touch the surface. Keep it moving at the rate of 12 inches per second. No obvious change takes place, but the flame oxidizes the surface and dramatically improves adhesion. Make multiple passes of the torch ?" apart to treat wide areas. Be careful not to melt or burn the surface. While flame treating will improve adhesion to most plastics, it appears to provide the greatest benefit to polyethylene (HDPE and LDPE). If you are unsure of the type of plastic, it doesn’t hurt to flame treat. " HTH, and 73-- Brad AA1IP |
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Re: OT - Fluke 8800A/8810A Handle needed
开云体育Precisely! The activator works with other glues too — try first, but I use it on tough epoxy joints as well – where I need some bulk and not just contact action.?
Cheers, Kuba
Something like this?
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Re: OT - Fluke 8800A/8810A Handle needed
Something like this?
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Loctite-Super-Glue-Plastics-Bonding-System-with-Activator-2-Gram Michael A. Terrell -- -----Original Message-----
From: Kuba Ober Try a “high surface energy” activator for cyanoacrylate glue. I glued some vacuum cleaner parts that way: nothing would touch them, but after some sanding with 400 grit sandpaper and application of the activator, the superglue got the parts glued within seconds – they won’t break again in the same place. Cheers, Kuba |
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Re: 85460A RF Preselector for HP 8542A EMI rcvr
Hello All!
Does anyone have experience in using the HP85460A RF preselector box independent of the EMI receiver?? Very nice bit of hardware, looks like HPIB selectable filters/RF paths/preamps from 9 kHz to 6.5 GHz.
Interesting info in service guide that says you can hook it up directly via HPIB to 8753B and use the network analyzer to setup the filters for test &tuning.? If I was hot stuff with HPIB, I guess I could do this with a Bus Analyzer attached and trap the command strings out that select the various filter ranges. Was hoping maybe someone knew more...
TIA!
Regards,
Jeff Kruth
WA3ZKR
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Re: OT - Fluke 8800A/8810A Handle needed
开云体育Try a “high surface energy” activator for cyanoacrylate glue. I glued some vacuum cleaner parts that way: nothing would touch them, but after some sanding with 400
grit sandpaper and application of the activator, the superglue got the parts glued within seconds – they won’t break again in the same place.?
Cheers, Kuba
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OT - Fluke 8800A/8810A Handle needed
Just received a Fluke 8810A (newer model of 8800A) Bench DMM where the handle was broken (in shipment) and nothing seems to glue it. Does anyone have a handle or a case with handle from a scrap unit they would be willing to part with? The 8800A/8810A use the same handle but it is different than the one from the more common 8000A and 8010A/12A/50A etc.
Thanks, Sam W3OHM |
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Re: Cleaning RF bits (attenuators, connectors, etc.)
开云体育I have had some moderate success cleaning the foam rot by? using "Tarn-X", which is a jewelry cleaner.? Not perfect by any means, but certainly an improvement.Daun Daun E. Yeagley II, N8ASB
On 10/6/2018 6:03 PM, Dr. David Kirkby
from Kirkby Microwave Ltd wrote:
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Re: Cleaning RF bits (attenuators, connectors, etc.)
Isopropyl alcohol is quite hygroscopic. If exposed to air for a time pure ispropyl will become 91%. That is usually the dryest one can buy in general trade. 99+% is available from stores who sell computer supplies and some other places. I don't think it is ever completely free of water. 99+ requires care in handling to prevent absorption of more water.
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The problem is that when the alcohol evaporates the water is left behind. For many purposes it makes no difference but there are some applications where the driest alcohol possible is necessary. One is cleaning the emulsion side of photographic film. Currently, 99+% IPA is Kodak's recommended film cleaner for the emulsion side only because it can attack some types of supports. There were better materials such as 1,1,1,trichlorethane, but they are now considered hazardous. On 10/6/2018 3:03 PM, Dr. David Kirkby from Kirkby Microwave Ltd wrote:
On Sat, 6 Oct 2018 at 19:44, John Ackermann N8UR <jra@... <mailto:jra@...>> wrote: --
Richard Knoppow dickburk@... WB6KBL |
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Re: Cleaning RF bits (attenuators, connectors, etc.)
Dr. David Kirkby from Kirkby Microwave Ltd
On Sat, 6 Oct 2018 at 19:44, John Ackermann N8UR <jra@...> wrote: I have a bunch of type N attenuators and connectors where the electrical IPA is reccommended by Keysight. I buy "eBay graded" IPA. Supposed to be 99.9%, but any more than 80% would be a bonus! I would not immerse anything, even in IPA. I had some 3.5 mm connectors with foam on them from an HP cal kit. I could not clean it off. I tried IPA in an ultrasonic cleaner, but that would not touch it either. Then I tried acetone. That melted bits of the connectors. I everntually stuck on eBay as for spares or repair, and they were bought by yikunhk - the HP rebirthing centre. Dave |
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Re: Hp 8648C with output level problems
Hi Peter First is the PSU OK for voltage and noise, well known problem with 8648X signal generators 73 George G6HIG On Saturday, October 6, 2018 8:48 PM, Peter Hansen <oz1lpr@...> wrote: Hello All I have a Well trusted HP 8648C signal generator I used for many years. It has the high output option (20dBm output). It has now low output around 2-3dBm output maximum and it is not stable in amplitude.
I have ruled out the Attenuator and Reverse power protection. I measure the power direct on the output module.
I heard about Failure of the output MMIC. Can anyone comment on that.
I have seen that MMIC type for sale on Alibaba page. Has anyone ever tried buying that component from them. Is it safe to assume the part is genuine ?
73 Peter OZ1LPR
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Hp 8648C with output level problems
开云体育
Hello All I have a Well trusted HP 8648C signal generator I used for many years. It has the high output option (20dBm output). It has now low output around 2-3dBm output maximum and it is not stable in amplitude.
I have ruled out the Attenuator and Reverse power protection. I measure the power direct on the output module.
I heard about Failure of the output MMIC. Can anyone comment on that.
I have seen that MMIC type for sale on Alibaba page. Has anyone ever tried buying that component from them. Is it safe to assume the part is genuine ?
73 Peter OZ1LPR
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Michael A. Terrell
Sam Reaves
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