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Re: HP 11664A Detector - DIY equivalent?

 

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Hi tony there are various pictures of homemade detector adapters in the pictures on this site

Paul B

?

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
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
Re: HP 11664A Detector - DIY equivalent?

 

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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

?

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.

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

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



<andytwgss@...> ezt ¨ªrta (id?pont: 2022. febr. 3., Cs, 17:15):

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.

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

Re: 8350B *restoration adventure?*

 

PD I'm not in the UK, I live in Madrid, Spain
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

WhatsApp Image 2022-02-04 at 09.49.29.jpeg
WhatsApp Image 2022-02-04 at 09.49.30 _1_.jpeg
WhatsApp Image 2022-02-04 at 09.49.30 _2_.jpeg
WhatsApp Image 2022-02-04 at 09.49.30 _3_.jpeg
WhatsApp Image 2022-02-04 at 09.49.30.jpeg

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
HP detector

 

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.?
Re: HP Test Equipment Logo Plates Wanted.

 

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Hello William,

?

If you mean the HP logos on blue and black backgrounds, about 12 mm x 7 mm, I have a couple available. I¡¯m in Australia; so, the postage may be a problem ¨C suitably packaged, they may be too thick to travel as a letter.

?

73 de Brian, VK2GCE.

?

From: [email protected] [mailto:[email protected]] On Behalf Of William Kibler via groups.io
Sent: Friday, 4 February 2022 4:28 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP Test Equipment Logo Plates Wanted.

?

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.?
HP Test Equipment Logo Plates Wanted.

 

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.?
Re: Convert monochrome 5454x scope to color

 

Just for informational purposes I had to replace the CCFL back-lights on one of my 54542C's and used:

The LCD screen in mine was a?Toshiba Screen LTM08C015KA?

There is also a crude partial schematic that I did of my 54542C a long time ago where I had to reverse engineer the calibration circuit to fix the signal on the back used for calibration.
I could have swore I uploaded it to the files section, but I cant find it. I'll uploaded it again if interested.
Re: HP 140A and 141A oscilloscope power supply issues

 

Chris, the main differences between the A, B and S, T models of the 140 Mai frame family are?
(1) the S and T versions have rear connectors (or access holes for spectrum analyzer plug-ins) for accessory instruments, and?
(2) the S and T versions are better shielded for use at higher frequencies.?

Jeremy?


On Thu, Feb 3, 2022 at 1:57 AM Christopher Tucker via <cartheur=[email protected]> wrote:
Probably a bit out of scope, but I have always wondered the effort of simply replacing the transformer with a (set of) modern equivalents. The main reason from my side has been the occasional over-hum that is more annoying than functionally problematic - especially when upgrading to a silent fan.

I can think that any 8443A Tracking Generator has the same pervasive buzzing (no fan on the later models with LED display for the counter).

To your point on the closeness of the 141A verses 140T: I would be curious as to what differences there are. I'm currently deep into restoring a 140S, so if there are things to sort between these systems, now would be the time to align.

Christopher



--
Jeremy Nichols
6.
Re: HP 140A and 141A oscilloscope power supply issues

 

Hi, Christopher!

As I look at the schematic documentation that you supplied for a 140B frame and a 140T frame, these appear identical to me.? At least, I think so.? (The 140B manual is a bit rougher scan, so it is a little harder to read.)

In any case, these schematics appear to match what I have in my 141A frame with one exception:? On my high voltage regulator board, there are 3 neons in series (75V variety, NE96) in the CRT cathode circuit instead of the 2 shown in the 140B/140T schematics (i.e., V697 and V608).? Can you hazard a guess about why this change/difference?

Otherwise, the LV board, the HV regulator board, and the HV rectifier board in my 141A match your 140B/140T manuals as far as I can tell.

Thanks again for your help.

Neil
HP 6012B power supply

 

Hello All,

My 6012B variable power supply has been reading a "negative current display" when the unit is turned on, even though the current pot is turned fully CCW to zero. If I adjust the "voltage pot" to say 12 volts, but the current pot stays at zero, and short the output leads, there is a fairly hefty spark, like there is current flowing, but there should not be.? If I depress the "display settings" button and adjust the current to say 5 amps, then release the button, the display will still read a negative number.

Putting a 5 amp load on the power supply still displays a negative number.

Has anybody had this problem and if so, what was done to correct the problem.? What area of the schematic should I be looking into?

Thank you,

--jeff
Re: 8673D RF generator_MPU connector (part of kit hp11726A)

 

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Hi,

?

For the MPU connector (part of KIT hp11726A) that I mentioned in the previous email, I finally did the loop assembly between J1 and J2 since I found parts available, and did the test.

And it works, and the test indicator on front panel, showed "05-1" which confirmed that everything was correct.

?

So, I was able to check the sawtooth signal at test point A2A8TP5, and confirmed that the adjustment was OK.

?

Conclusion: the MPU connector for the diagnostic tests and adjustment of the 8673D is a loop between J1 and J2 as described in the previous email.

?

The HP 11726A kit includes a 11726-10004 cartridge containing test software for an hp85 used to test and adjust an 8673D, if anyone has the listing for this program I would be interested in a copy.

?

-Yves

De?: [email protected] <[email protected]> De la part de Yves Tardif
·¡²Ô±¹´Ç²â¨¦?: 3 f¨¦vrier 2022 13:12
??: [email protected]
Objet?: [HP-Agilent-Keysight-equipment] 8673D RF generator_MPU connector (part of kit hp11726A)

?

Hi,

?

I found an 8673D generator for my lab, and had to do some minor repairs (power supply, bad contact problem on a PCB).? It is functional but I'm at the point of doing a more detailed check of its condition, mainly the output RF level.

I did a test on the whole band (.05-26.5 GHz, ALC disabled, auto peak reactivated at any frequency change), the attached graph shows 3 curves:

in green, a test in bypass mode (no YTF in the loop or other additional filtering),

in blue it is the normal mode with YTF,

and finally in black, an extract from the hp datasheet showing the typical maximum available power value (ALC disabled).

The green dotted line shows the HP specification for the bypass mode and the blue dotted line shows the normal mode (ALC on).

?

There are 3 places where the level is out of specification, and according to the service manual, the cause is that the YTM (frequency multiplier) is not correctly aligned.

From 21.7 GHz, a light indicating error 90 appears (AUTO PEAK MALFUNCTION)...probably out of the operating limit.

?

Looking at the procedure to be done manually, in the service book, it says that I have to use an MPU connector (part of the hp11726A kit) that I have to connect on the top of the A2A8 assembly module.

Activate the service switch to position 5. Power up the 8673D and make a specific adjustment.

?

Does anyone have any information about this MPU connector (part of the hp11726A kit)? Or what exactly is its function?

Or some recommendations about the alignment of the YTM?

?

Since there is no power on these connectors (J1-J2), my theory would be, that this connector is simply a loop between J1 and J2 and pin 7 of J1 would be grounded to signify its presence and also to activate a certain configuration (see schematic image).

If pin 7 is grounded, the RMA signal activates the ROM U3 for diagnostic mode (Chip Select of the UV EPROM 2716), and the RMB signal (output enable), under R/W control of the processor and the address decoder.

?

-Yves

?

?

?

?
Re: HP8753C Source Pretune after YIG replacement

 

On Thu, Feb 3, 2022 at 12:26 AM, Marcus Gustafsson wrote:
http://www.dalton.ax/hpdisk
Yes thats the one I was looking at. Great I might give this a try on the 8753.
Re: 8350B *restoration adventure?*

 

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Hi Ruben,
Glad it helps, I've attached the cross reference for T1 part numbers from my manual (which you may already have) and a scan of the A6 board main fold-out from the manual as well, I've not compared it with the change-note version I sent earlier so I don't know if it is relevant but I thought a non-blurred copy may be useful anyway!

Are you in the UK? I'm based near Cambridge.

Adrian

On 03/02/2022 15:27, RubenRubio wrote:

Thanks Adrian! That helps a lot, my schematics are blurred!

I am a bit confused now, reading the ratings of fuses in A17 and A18 boards from 8566B SA. The current figures are low, specially for the 10 and 5 volt rails, even considering the size of the transformer (it looks bigger than mine). I am lost at this point.?

Maybe the 8566B main transforme could be swapable to my 8350B... but I am not sure, looking only the fuses ratings in both machines (I attached the tables). Maybe the transformer could do the job because overdimension or maybe not. Also depending the way to connect windings can help to feed enought current.

Opinions?


Attachments:


HP5350B_Replaceable_Parts_Xref.pdf
HP5350B_Replaceable_Parts_Xref.pdf
HP8350B_A6_Schematic.pdf
HP8350B_A6_Schematic.pdf

Re: HP 8601a Victim of Shipping Damage

 

Thanks Christopher,

Thanks for the tip on DHL.? Overall, shipping in general? has been really disappointing the last 2 years.? In the 25 years prior to that,? I've purchased quite a bit of equipment and radios and rarely had any significant damage, but now I am hesitant to purchase any equipment that I cant pick up directly.

I'm trying to do "reconstructive surgery" on the Output vernier shaft & potentiometer which was smashed deeply inwards.
It passes thru the attenuator box and I was curious about the rear threaded hole on the attenuator- Should the output vernier potentiometer thread into the rear attenuator hole?.?

The attenuator hole is same size and theads as potentiometer but since it was damaged, I cant really tell.
From a RF leakage perspective, it would seem that hole should be as closed as possible.

A few pics are attached.
Thanks

DB


=======================================
This has happened more than once using the eBay shipping services. The one where they bent the frame on a 5340A and nearly shook apart a 141S was the last straw.

While it is late to point fingers, I recommend you open a commercial shipping account with DHL. Twenty shipments and everything has arrived safe and sound.

Good luck on finding parts. I had been looking for an 8601A for some time before finding a great one. I see them on eBay but caution you to my earlier point.

Christopher

HP 8601 Vernier Attenuator - Copy (1).jpg
HP 8601 Vernier Attenuator - Copy (5).jpg
HP8601a damaged control and shaft (13) - Copy.jpg

Re: HP 54645A internal battery

 

Hi Manuel,

Open it up and take a look.
If you find a battery, take a picture and share with us.
In my standard old HP 54645A, there is only the battery inside the NV-RAM chip.
It did of course run out of juice... I ended up modifying it with an external battery.

And can you check what firmware version you have. Should show at power on.

Regards,
Askild


On Thu, Feb 3, 2022 at 6:45 PM Manuel Maseda <mmaseda@...> wrote:

I just purchased a 54645AN scope. The N means it was delivered under a US Navy contract.? It has a sticker on the back that says it contains a Panasonic BR2354 lithium battery.? Are they referring the the battery inside the NVRAM or is there a separate standalone battery? ?


Manuel
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