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Re: Advice on Accessories for HP Equipment
I'd like to suggest getting one of Leo Bodnar's excellent GPSDOs. I have the 2 output version which I needed to run an SDRplay RSP2 and a VNWA 3E. I bought the outside mount antenna kit from Leo at the same time. Works a treat.
I've been making my own H field probes from solid shield RG402 and can't really imagine why one would buy one at the prices charged. All they are is a wire loop which is shielded so it only responds to the magnetic field. Reg |
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Re: CRT needed for HP 8505A
Hello together,
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Thanks for the Information, but I guess I was a little to late for that: On Sat, Feb 15, 2020 at 11:58 PM, Sam Reaves wrote: Did you see where Jeff Kruth has a CRT available for your HP8505A? He posted a message on this in the last few days.And bought another one. unfortunately that one arrived like that: I guess the metal shielding was the problem during transport. Therefore I am still looking for a replacement... Regards, Gerrit |
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Re: Q: Future Plus PCI-X probeable adapter for HP/Agilent 16700/16900 logic analyzers
On Fri, Mar 6, 2020 at 9:38 AM Tony Jones <tony@...> wrote:
I used a FuturePlus FS2000 PCI Analysis Probe with a 16500C and 16700A many years ago for debugging USB host controller driver issues and needed to see what transactions were occurring on the bus. Only needed to use it a few times, but when I did there wasn't really anything else that would have done the job. I still have one or two FS2000 probe cards. They are obsolete for the most part now that almost everything current uses PCI Express, although some people here still work with obsolete technology. |
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Re: Advice on Accessories for HP Equipment
David Campbell
An ovenized XTAL based or PLL unit at 10Mc should be easy to find. Just Google it. I dont know if any of the new AWGs can hold 1ppm or not.
As to testing, my first suggestion that a proper room is the first point... cant do high precision noise detection in a noisy lab environment It sounds as if youll be sniffing down around -150dB...SWAG... may need a heavily shielded a/o anechoic room as they sometimes use for microwave testing. Filtered power lines, DC lights,,, ESD control. Maybe even underground depending on how sensitive it is. We are all neophytes when challenging the unknown. If not, it wouldnt be unknown! |
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Re: Advice on Accessories for HP Equipment
Pete Manfre
Cheap NFP are typically not calibrated or accurate.? I might have an extra hp NFP system that I could spare¡ and it is in cal.? Locking to? a gps would yield decent accuracy usually unless you are way up in the new range¡ then it would be a bit higher then your required ppm.? Pete wa2odo? On Fri, Mar 6, 2020, 4:32 PM Steve Hendrix <SteveHx@...> wrote: I have two needs for upcoming projects, at most loosely related to |
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Advice on Accessories for HP Equipment
I have two needs for upcoming projects, at most loosely related to one another. The total knowledge of this group makes me look like a complete neophyte, with only a few decades of experience, so maybe you can guide me away from making a mistake.
The first need is for a frequency reference. I have a project in progress now, where within a couple weeks I'm going to need to be able to measure frequency to better than 1 ppm. I'm thinking to use a GPSDO to feed a reference into my HP8595E and check its calibration (it doesn't seem to have an external reference input), or to feed it into the Ext Ref input of my HP8714ET. I see a lot of different GPSDO units on ePay; is there anything I should look for or avoid? Note that my office / lab is rather marginal for receiving GPS, with a couple floors above it as well as a lot of trees. But I could if necessary put the GPSDO outdoors and feed the 10 MHz inside on a cable. The second need is a near field probe and/or calibrated antenna for doing pre-compliance measurements on designs that usually come in so far below the limits as to be hard to even detect. I see about three different classes of NFP on ePay: a grouping around $30, another around $100, and yet another around $500, all for kits of four NFP. What are the differences, and again what should I watch for? Any hints welcome, and if I'm too far OT just say so. Steve Hendrix |
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Re: HP 651B Oscillator restoration and an OOPS!!
Aren't these children a bit excessive - maybe we should block both of them.
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Cummon guys - GROW UP Quoting "Dale H. Cook" <bridgewaterma@...>: On 3/6/2020 12:46 PM, David Campbell wrote:... they were that badly oxidisedThat sounds like the parts were long stored in a very poor environment. I have never seen that in the original caps in any of my 16 HP instruments of that vintage (13 working and 3 parts junkers). Mine, however, were almost all purchased from individuals whom I know, or at meets, and in all of those cases I was able to have a look inside to evaluate condition. It is common for the HP caps of that vintage to look somewhat poor due to deterioration of the plastic sleeves but to measure fine at rated voltage for both C and D on a GR bridge. |
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Re: HP 651B Oscillator restoration and an OOPS!!
Dale H. Cook
On 3/6/2020 12:47 PM, David Campbell wrote:
Your comments are not constructive. They are flaming. Not accepted.You have not tried to ascertain my professional experience, which exceeds yours by more than a decade, so I consider that reply flaming and shall block your posts. -- Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA |
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Re: HP 651B Oscillator restoration and an OOPS!!
Dale H. Cook
On 3/6/2020 12:46 PM, David Campbell wrote:
... they were that badly oxidisedThat sounds like the parts were long stored in a very poor environment. I have never seen that in the original caps in any of my 16 HP instruments of that vintage (13 working and 3 parts junkers). Mine, however, were almost all purchased from individuals whom I know, or at meets, and in all of those cases I was able to have a look inside to evaluate condition. It is common for the HP caps of that vintage to look somewhat poor due to deterioration of the plastic sleeves but to measure fine at rated voltage for both C and D on a GR bridge. -- Dale H. Cook, Member, NEHGS, AGS, MA Soc. of Mayflower Descendants; Plymouth Co. MA Coordinator for the USGenWeb Project Administrator of |
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Re: HP 651B Oscillator restoration and an OOPS!!
David Campbell
A. My comment is not about your claimed experience.
B. It might not work if you do it, but when I, with 30 plus years of experience and NIST traceable gear do it, its dead accurate Its an instrument when I do it. Your comments are not constructive. They are flaming. Not accepted. |
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Re: HP 651B Oscillator restoration and an OOPS!!
David Campbell
Being an EE with manufacturing, parts buying and engineering experience, these caps didn't even make it past check-in against the invoice on Receiving
they were that badly oxidised- so badly I could see it thru the packaging. Hand soldering, an inconvenience perhaps. Manufacturing? Possibly a real problem if there are solderability issues. the oxidation was so bad I had to scrape it off with a hardened steel ruler to photograph it. Drawing the leads thru a cloth had no effect. I contacted Vishay who said they bought and re-opened the old Sprague plant and were producing (something-whatever) and thats why they were advertised "Vishay-Sprague" by Mouser, ALTHOUGH... no info on "Sprague" parts appeared on the Vishay site. Vishay said the date codes were 2018. The Rep also said that this level of oxidation is not consistent with the date codes, which admits fraud. I dont know for a fact that fraud is ocurring, BUT counterfeit goods from China is a plague these days. Its an absolute plague in the nuclear industry, so bad that DoE issued a inch-plus thick advisory text for the Hanford site warning Engineers and Purchasing to carefully inspect goods. I suppose its possible that old stock 'cans' (drawn cups/leads) were used in modern production- i have no way of knowing. The date code is not necessarily reliable. Its printed on a heat shrink tubular sleeve. It can be forged easily. Maybe they had old-stock caps and printed a? new label? A 3 cent label, or throwing away a 50 cent old cap? Again, not saying Vishay did so, but it would be easy to do and to hide. I do know from a LONG time riding a test and high volume repair bench to never trust an old electrolytic. Ive seen too many short, leak and explode and do circuit damage especially in older gear with pass-transistor regulated supplies. One cap exploded and ended up buried in the false ceiling 10 foot up. Used to see 'lytics that shorted destroy power transformers to fill the shop with smoke. Power transformer / pass transistors, 200$ plus or not available. New caps? 50-ish?. Mouser denied it six ways from Sunday but refunded my money. Vishay admitted the leads werent right. Both denied counterfeiting. Vishay said Mouser didnt have counterfeit parts. How would they know? I bought all new caps from DK for half the cost. Just more hand-tuning by testing and assembling combinations of the correct values/tolerance. Trading time for $. interesting trivia point- the 1100 uF NP cap in the '651 was an 'aerospace grade' part, rated at 200,000 feet operation by an old Sprague document. It was odd that the end-plug was very thick with a hard plastic cover, and the 'anode-end crimp' was extra deep and wide... and only a 10V unit. |
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Q: Future Plus PCI-X probeable adapter for HP/Agilent 16700/16900 logic analyzers
Anyone know much about these?? ?Allows you to connect a 16700/16900 to a PCI card. |
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Re: 5350B - transmutation to a 5351B
Thanks very much Richard.....................................Don. On Sat, Mar 7, 2020 at 4:26 AM Richard Parrish <Richard@...> wrote:
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Re: HP 651B Oscillator restoration and an OOPS!!
Dale H. Cook
On 3/6/2020 10:14 AM, David Campbell wrote:
Replaced all of the electrolytics and tantalums, quite a chore to get the exactly correct valuesWhy? How did you determine that the electrolytics needed to be replaced? I have many HP instruments of that vintage that still meet spec and have never needed to have any of their caps replaced, including my 651B which was last used yesterday. You cannot buy new caps that are anywhere near as good as the originals used by HP. * used an AWG and good analog scope in place of distortion meter (its just a sine wave...)That's fine if you just need test equipment, but your 651B is no longer an instrument if you don't know its specifications. -- Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA |
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Re: HP 651B Oscillator restoration and an OOPS!!
David Campbell wrote on 3/6/2020 10:14 AM:
651B 1975 edition.<snip> Hello, Dave-- Were there any date codes on the Sprague caps? Thirty years ago might register as, for example, 2690 (i.e., the 26th week of 1990).? Codes vary among manufacturers, but IIRC Sprague used <two-digit week> <two-digit year> format. If there are no date codes present, the caps could be counterfeit. I'm very surprised to learn that Mouser could be selling such old stock-- you might consider writing them a letter of complaint. 73-- Brad? AA1IP 73-- Brad? AA1IP |
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HP 651B Oscillator restoration and an OOPS!!
651B 1975 edition. Replaced all of the electrolytics and tantalums, quite a chore to get the exactly correct valuesPoints: * replace ALL electrolytics. No old stock, get new fresh stock from Digi Key only. They religiously track stock and age. This is (or was) high end test equipment, not an old stereo. * Ranges dead- cleaned switch segments with Q Tip and isopropyl alcohol. DELICATE WORK. This fixed the 'dead range' problem. There was a LOT of black oxide residue. Spraying cleaner is NOT enough, because that doesnt clean the inside surfaces of the switch fingers that ride on the wafer segments. * Used a Beckman DMM to monitor TP2, no 1K resistor needed. 10 Mohm input. * used an AWG and good analog scope in place of distortion meter (its just a sine wave...) Fed reference signal at 1Kc into one scope channel and the HP gen output into the other, then synchronized the frequencies and matched amplitude, then did an ADD and SUBTRACT on the scope channels. The trace was dead flat- no distortion * when checking levels and tracking, FIRST check for spurious oscillation. If there is any, REDUCE the value of A2C21, 12 pF. Its very touchy, I used 10 pF leaving a very small amount of oscillation. Avoid changing the resistor value, it reduces output voltage. Even after 30 years experience on the bench, I did something very bad..,. Am considering replacing the Monitor circuit and meter with a voltmeter unit. Thoughts? |
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Re: 5350B - transmutation to a 5351B
¿ªÔÆÌåÓýI¡¯ve posted the information related to the frequency response change for the 535x series a couple of years ago but to sum it up again, You do have to change the switch/jumper position AND you have to change the value of the 1/8W resistor closest to the sampler from what it is currently is to 287K.? After that your counter will count to 40-46GHz at the input to the sampler itself.? While the samplers do have different part numbers, I¡¯ve yet to find any of them that won¡¯t make it to 40GHz at the minimum. ? HP offered option 05 (46GHz) and all it had was a 2.4mm connector & cable.? The cable was 2.4mm on one side and SMA on the other. ? Richard Parrish ? From: [email protected] [mailto:[email protected]] On Behalf Of donald collie ? Thanks Bob,Mark, and Askild. I apologise for taking so long to reply - this is due to the different time zones. Yes, the `52 has a different sampler than the `50,or`51. The `50,and `51 have the same limiter [if fitted ], sampler, and microwave module. It could be that they are identical apart from the settings of the DIP switches, mentioned in Askild`s reply, and the printing on the front panel. My 5350B is in Texas still, and won`t be here for a couple of weeks, but I`ll have a look at the DIP switch settings when it arrives, and compare these with those on Askild`s 5351B, and might try changing some of the settings. I don`t think I can do too much harm by doing so. As far as the different connector on the channel 2 input is concerned, I suggest that it doesnt really matter what sort it is because the input SWR is about 3.5 anyway. I haven`t been able to find any mention in the manual I have to what each DIP switch does, and I`m not sure how to get this information. More later. Cheers!.........................................Don ? On Fri, Mar 6, 2020 at 9:44 AM Mark Bielman <mbielman@...> wrote:
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Re: 5350B - transmutation to a 5351B
Thanks Bob,Mark, and Askild. I apologise for taking so long to reply - this is due to the different time zones. Yes, the `52 has a different sampler than the `50,or`51. The `50,and `51 have the same limiter [if fitted ], sampler, and microwave module. It could be that they are identical apart from the settings of the DIP switches, mentioned in Askild`s reply, and the printing on the front panel. My 5350B is in Texas still, and won`t be here for a couple of weeks, but I`ll have a look at the DIP switch settings when it arrives, and compare these with those on Askild`s 5351B, and might try changing some of the settings. I don`t think I can do too much harm by doing so. As far as the different connector on the channel 2 input is concerned, I suggest that it doesnt really matter what sort it is because the input SWR is about 3.5 anyway. I haven`t been able to find any mention in the manual I have to what each DIP switch does, and I`m not sure how to get this information. More later. Cheers!.........................................Don On Fri, Mar 6, 2020 at 9:44 AM Mark Bielman <mbielman@...> wrote: The '52 has a different MW sampler (might be screened for upper frequencies) and a different input connector assembly. |
