Hans and Eric - thank you, that's very helpful. The Texscan (first time I heard about it) seems to have a very clean spec sheet, sounds like a very good deal for the money.
Robin - that one's pretty good price/spec ratio, but it doesn't seem to quite go as low as I need it (be flat to at least to 1MHz on the low end).?
Thank you all.
Just try eBay if you don't find one here.? While the prices of the *unsold* items on eBay are indeed crazy money, if you look at what has actually sold, it is much more reasonable.?? There are some HP 420A for $39 ... good to 12.4GHz
See:
Might have a paper copy of the 8471A manual, which (if I can find it) will scan and make available
/Hans
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Just try eBay if you don't find one here.? While the prices of the *unsold* items on eBay are indeed crazy money, if you look at what has actually sold, it is much more reasonable.?? There are some HP 420A for $39 ... good to 12.4GHz
See:
Might have a paper copy of the 8471A manual, which (if I can find it) will scan and make available
/Hans
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See:
Might have a paper copy of the 8471A manual, which (if I can find it) will scan and make available
/Hans
|
Hans - I've not been able to track down a datasheet or catalog page for the?
HP 8471A. The Keysight website is typically very good at having manuals, catalogs, datasheets, etc. for?vintage HP or Agilent equipment, but for this particular one - and it's the first?time I see a broken link on that website - points to catalog pages that are missing this component. The linked catalog goes to?
HP 8471D, E etc.?
Greg - it doesn't have to be HP; it's just I've been told the HP is the gold standard on detectors. Which seems to be reflected in price... But really all I need is good linearity. I have a couple of detectors currently - a vintage "Telonic" that doesn't seem to be worth anything, and a AD8307 active one that's pretty good but I still don't have a solid certainty of its linearity or even suitability. So, if another brand is known to be good (linear and reliable) but less glittery than HP and therefore can be had for less, I'd be interested in hearing about that.?
For instance, Wavetek has a detector which may fit the bill (D-152), but I haven't seen one for sale anywhere currently.?
Thank you, Radu.?
On Fri, Feb 4, 2022 at 8:44 AM Greg Muir via <big_sky_explorer= [email protected]> wrote: Does it have to be HP?? For the frequency range that you are dealing with HP detectors seem to be a little overkill.? There are plenty of other manufacturers whose offerings would fit your needs at a much lower price especially if found on that auction site.? And many of them offer frequency ranges up to 10 GHz or more.
?
I have even found detectors installed on RF transmission line directional couplers from old broadcast transmitters that were heading for the scrap yard, were of major manufacture and swept out to 8 GHz.? The price was free.
?
Greg
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Does it have to be HP?? For the frequency range that you are dealing with HP detectors seem to be a little overkill.? There are plenty of other manufacturers whose offerings would fit your needs at a much lower price especially if found on that auction site.? And many of them offer frequency ranges up to 10 GHz or more.
?
I have even found detectors installed on RF transmission line directional couplers from old broadcast transmitters that were heading for the scrap yard, were of major manufacture and swept out to 8 GHz.? The price was free.
?
Greg
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Look at the HP 8471A
0.1 to 1200 MHz and BNC
/Hans
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Look for a HP 8471A
0.1 to 1200MHz and BNC
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Re: HP 3314A DC Offset issues
Hello;
I repaired a 3314A a while back, I did a bunch of waveform and voltage measurements, I've attached my annotated schematics.
The docs I accumulated are here:
https://xdevs.com/doc/HP_Agilent_Keysight/3314A/
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Re: HP Test Equipment Logo Plates Wanted.
I am down to five spares. How many do you need and what is your shipping address?
John Franke WA4WDL
4500 Ibis Ct
Portsmouth, VA 23703
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On February 4, 2022 at 12:28 AM "William Kibler via groups.io" <will.kibler@...> wrote:
Greetings, I have a couple pieces of test equipment missing the HP logo plate. The kind that is held in place with the two bumps.?
One is an HP 5326B the other is the venerable 8640B. I¡¯d really like to complete my restorations with some original logos if possible.?
Please let me know where I might acquire a couple. I¡¯d be very grateful.
Thank you.?
?
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Re: Convert monochrome 5454x scope to color
Outstanding! That CCFL what I will need to do soon, display is fairly dim.
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Re: HP Test Equipment Logo Plates Wanted.
Brian, thank you. I'd like to wait a bit and see if anyone closer has any but if not I would be willing to pay shipping along with whatever you think is fair.
I'm in Michigan.?
-William
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Re: HP 11664A Detector - DIY equivalent?
Hi tony there are various pictures of homemade detector adapters in the pictures on this site Paul B ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Tony
Sent: 04 February 2022 09:56
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 11664A Detector - DIY equivalent? ? Thanks Jeff - sounds like something I can have a go at. Do you happen to have a picture of your modified detector - be really useful to see the layout.
thanks
Tony
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Re: HP 11664A Detector - DIY equivalent?
Thanks Jeff - sounds like something I can have a go at. Do you happen to have a picture of your modified detector - be really useful to see the layout.
thanks
Tony
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Re: HP 11664A Detector - DIY equivalent?
I have done as Jeff described a number of times to get someone a working scaler analyser I use the 11664 C detector adapter for frequencies above 18 Ghz? so if you are making an adapter without using an old 11664 then the circuit used in the D version is actually better and easier to configure to different detectors ? Also I have seen possibly on this site a modern board lay out using modern components Paul B ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Jeff Kruth via groups.io
Sent: 04 February 2022 09:15
To: tonycox01@...; [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 11664A Detector - DIY equivalent? ? Yes, I have. Polarity of detector doesnt matter, as the signal is chopped at 27.8 KHz. Best bet is get a blown detector then remove the detector bulkhead and fashion a small aluminum sheet metal plate to hold a BNC, replacing the bulkhead with this. It is the same as an HP11664C detector adapter. Easy-peasy. Works great.
In a message dated 2/4/2022 3:52:30 AM Eastern Standard Time, tonycox01@... writes:
Hi,
I've been looking for a couple of HP 11664 detectors for a network analyser but was put off by the sky high price - even for second hand items of dubious condition.
I've seen a web page showing a DIY equivalent using a?33330B?(positive)?detector and an amplifier replicated from the HP service manual.I was wondering if this is a sensible/realistic thing to attempt? Has anybody ever tried this?
thanks
Tony
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Re: HP 3314A DC Offset issues
Hi,
I've just recently fixed poor 3314A, though not with this problem.
But my suggestion is to do a logical sequence of troubleshooting. Study the schematics and work your way along the signal path. If you get an error 34, that means that the signal amplitude is out of limits, obviously because of the offset. The self calibration check the signal right after the output amplifier, before the attenuator. So the problem could be practically anywhere.
However, the offset is injected after the attenuator. So if something is not right with the attenuator, then the controller my be adding offset, that is not suitable for that range. Maybe this is what causes the jumps in your case. I did have problems with the reed relays in the attenuator, the
CA3082? driver array was bad and also the actual reed contacts also.
Quite simple to check, look at the output signal with the scope and start from the lowest amplitude and start increasing. You should hear the faint click of the reeds and the signal amplitude should not really change much at that time, when the next attenuator range is switched. If there is a big jump, then you have a problem there. The range of output amplitude is created by the output amplifier creating 0-10V output and various attenuation values create the low level signal. I've documented my repair here:
Otherwise, if this is not the problem (most likely not), then go backwards and follow the signal and you'll find whether the problem is in the output, the preamp, etc. stage. Then check if all waveforms produce this or only one, in that case the waveform shaper may be the issue, etc. Of course as step 0. check all power rails.
The service manual has quite an extensive troubleshooting process, so go though that.
Szabolcs
Hello folks,
My very first post here.? I have been repairing and trying to do some very basic adjustments to the function generator.? Everything is fine until 5.13 DC Offset Adjustment.
I set up as per instructed, connecting 3314A 's output to my HP 34401A DMM via a 50-ohm dummy load, and set the Offset to .002V.
While Offset @ 0V being 0V, there is a very large offset however, when Offset @ .002 V, the A2-R267 DC Zero range gives -0.67 V ~ -0.12V at the output.? I verified again hooking up to my Tek 2445B scope @ 50-ohm input, offset adjustments appears to be smooth and continuous, except it jumps and always starts from the -ve when adjusting.??
The machine currently has a E34 error code when bootup and adjusting.?
Any ideas?? Thank you and much appreciated.
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Re: HP 11664A Detector - DIY equivalent?
Yes, I have. Polarity of detector doesnt matter, as the signal is chopped at 27.8 KHz.
Best bet is get a blown detector then remove the detector bulkhead and fashion a small aluminum sheet metal plate to hold a BNC, replacing the bulkhead with this. It is the same as an HP11664C detector adapter. Easy-peasy. Works great.
Jeff Kruth
?
In a message dated 2/4/2022 3:52:30 AM Eastern Standard Time, tonycox01@... writes:
?
Hi,
I've been looking for a couple of HP 11664 detectors for a network analyser but was put off by the sky high price - even for second hand items of dubious condition.
I've seen a web page showing a DIY equivalent using a?33330B?(positive)?detector and an amplifier replicated from the HP service manual.I was wondering if this is a sensible/realistic thing to attempt? Has anybody ever tried this?
thanks
Tony
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Re: 8350B *restoration adventure?*
PD I'm not in the UK, I live in Madrid, Spain
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Re: 8350B *restoration adventure?*
Hi again!
Yes, Adrian! Those pdfs helps a lot! My serial is 2642A, so T1 must and is the 9100-4603. Confirmed. And the A6 schematics are useful for my restoration procedure, thanks :)
Yesterday I started checks on rectifier boards. A6 needs two new transistors (2N2222), the earlier owner broke those messing with the transformer. I checked the diodes and fuses on A6 and everyone looks fine to me. Next will be feed some AC and check for rectifying action.
I want to check the A7 too, feeding DC with my bench supply and test with electronic load. Once I confirmed these two boards work properly, I'll try to feed rails with all boards installed on the motherboard (and crossing fingers).
While I wait for the UK transformer to arrive, I'll do deep clean and dismantle almost every bit of the unit.?Even if I don't restore it as a 8350B, it still needs deep cleaning. My plan is try the 'new' transformer beyond the fuse current ratings seen on 8566B manual, hoping it was oversized when the engineers put it on that SA. So let the good times roll.
Pictures attached: dirty front panel, burnt T1 (note char rosin between windings and cables - I checked all secondary windings in dead short except for the most external one), A6 with T1 rosin explosion residue and corroded/broken semicons, A7 and motherboard dirt/corrosion
Regards,
Ruben
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HP 11664A Detector - DIY equivalent?
Hi,
I've been looking for a couple of HP 11664 detectors for a network analyser but was put off by the sky high price - even for second hand items of dubious condition.
I've seen a web page showing a DIY equivalent using a?33330B?(positive)?detector and an amplifier replicated from the HP service manual.I was wondering if this is a sensible/realistic thing to attempt? Has anybody ever tried this?
thanks
Tony
|
Hi all,
I'm looking for a good HP detector, covering at a minimum 1MHz-500MHz, preferably BNC (SMA OK), negative output preferred, but positive OK.
Most importantly, not for an arm and a leg would be great. I get they can go for a pretty penny out there, but maybe there's an affordable one in this community to be had. Or a recommendation on where to look.?
Besides, I'd also appreciate input on just what HP part # I should be looking for, given my needs above.?
Thank you much in advance.
Radu.?
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Paul Bicknell
RubenRubio
