Hello group. Can anyone advise me the rating, and where to get, replacement fuses for the 525MHz channel input protection on a 5350B? The manual that I have has this information missing.
Thanking you for your consideration!.............................................................................................................................................................................................................Don C.

Hi Randy,

Welcome to the group! I assume that your unit is a 3325A, but both the A and B models are quite similar. Place your scope probe (high impedance) on the A16/A26 AMP OUT pin. If you have signal here, then the issue is in the attenuator board or output cables.

If there is no signal at AMP OUT, then the fuse F3 on the A16/A26 amplifier board could be open. Since you are not hearing clicking of the relays, the problem could be a few other things:

1) Bad or missing ribbon cable between the attenuator board and the A26 amplifier board.
2) Missing relay power
3) Open relay coils (not likely that all coils are open)
3) Faulty logic from the A14 board that enables relay switching.

Hope that helps! Let me know what you find and we can dig a little deeper..

Regards,

Joe

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New to the group, but have used HP gear for decades. I have a 3325 which appears to have an output attenuators issue. I can see the sync output on my Tek (555) scope, but do not see anything from the signal output connector. I have tried switching amplitudes, but do not hear any relay clicking (I had read some other post about the relays being audible). This unit was purchased years back as surplus, and had a red “not economical to repair” tag on it. I think I paid $25 for it. All the 7-segment displays work, and I can set for various frequencies, and see the sync....just no output,
Any ideas appreciated!

Ron,

?

The 85700A isn’t going to help you much if you plan to replace the NVRAM battery B1 on the video/processor board.? The calibration constants have to be manually logged per the instructions in section 3 of the “HP 8590 Series Assembly-Level Repair Service Guide” titled “Backing Up And Reloading Correction Constants.”

()?? The method to retain the correction constants falls back on good ol’ paper and pencil using the forms included in that section.

?

As for battery replacement without losing the constants, I use a procedure utilizing a bench supply.? I first remove the memory subassembly from the analyzer since it contains both the memory and backup battery.? Then I tack a ~1k ohm resistor to the positive side of the battery trace and a wire to the negative side (both away from the solder pads that attach the battery) then connect the resistor and lead to the power supply set to near the battery voltage.? This will allow you to retain the battery voltage while you replace the battery.? Use extreme care so as not to short out the supply lines to the memory lest you lose the contents.

?

It is also a good idea to add a diode in series with the resistor to prevent any backflow of current should you be using a power supply with a capacitive filtered output and forgot to turn the supply on before connecting it to the + and – sides of the memory board.? A discharged capacitor in the power supply could cause a brief drop in the RAM supply line depending upon where you connect your leads to the board.\

?

In all, using care you can easily replace the battery.? I do not recommend trying to replace the battery with the RAM board under power in the spectrum analyzer.? First, it is quite difficult and second, if you use any type of soldering iron grounded to the third wire outlet ground, you can short out the analyzer power supply voltage and not only lose your correction constants but also could do additional damage elsewhere.

?

Greg

Do you keep your unit plugged in, AC power to the power cord? I am not overly familiar with the 3336B, but that era of generator were never powered off as long as plugged in (ie. 3335A, 8340A/B, 8566A/B). They were in “standby” mode, the XTAL reference had an oven that stayed powered on. This may be what you are seeing. A cold oven would show a XTAL reference fault code that goes out in about 5 min. From a cold start the 10MHz would be within 5Hz of nominal but not be stable for about 20 min., and if no power applied to the unit for more than 30 days, it could take up to 30 days for the 10 MHz XTAL to fully stabilize within the annual 2 x 10E-9 MHz spec.
Don Bitters

Was trying to register using my tablet?
My laptop works but i think i have to wait for verification as it will not allow me to check out.?
Thanxs for your help?
Never thought there would be an issue with my tablet lol.

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Are you trying from a smartphone or a pc? Parts of the Keysight website apparently aren’t optimized for use from a mobile application but work from a pc.?

Hi Pierre-Fran?ois,

I am sure someone has them, but as you say they are really hard to find. Can the 8360 be aligned manually, using the front panel to make the settings? If so, I would find it much more attractive than I currently do.

Vladan
.

When I try to submit nothing happens.
I work for a custom magnetics company and tried that as well.
I can't get past the registration page to order.

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Is it giving you a reason?

Can't register to purchase, bummer?

On Sat, 29 Feb 2020, Jim Ford wrote:

And now it is all trashed.

Please never post anything from that stupid piece of junk -- it is buggy as
hell and turns everything it touches into turds.

Good.? I guess my phone and laptop computer automagically include the previous text.Yes, people who don't provide context are forgiven their minor iniquities.Thanks.JimSent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Sergey Kubushyn <ksi@...> Date: 2/28/20 11:47 PM (GMT-08:00) To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] 8510C: 8340B vs 83631B On Sat, 29 Feb 2020, Jim Ford wrote:> Thanks, Sergey.? I have updated my "wishlist" HP 8340 entry to add "best with > no options".>> BTW, do you see your own text below?? When I reply, I see the previous text > on my screen, and when I receive my own reply as posted to the group, it > contains the other text as well.? Therefore, I haven't made any effort to > copy text from previous posts.? But I've often wondered if others see the > previous text.? It bugs the crap out of me to see somebody else's "Yeah, I > agree" post, for example, with no context.Those people who post a single "Me too!" letters are mentally ill and it isa sin to insult them. Thou shalt forgive them; for they know not what theydo...Your quoting is fine; it is somebody else that screwed up earlier messagetext making it all one long line without breaks.>> Jim>> ------ Original Message ------> From: "Sergey Kubushyn" <ksi@...>> To: [email protected]> Sent: 2/28/2020 10:13:42 PM> Subject: Re: [HP-Agilent-Keysight-equipment] 8510C: 8340B vs 83631B>>> On Fri, 28 Feb 2020, Jim Ford wrote:>> >> I don't know who had all that message thread screwed up (guys, _PLEASE_>> setup proper quoting -- it is impossible to read) but as of 8340B I can >> tell>> that the best one is instrument without _ANY_ options.>> >> Unlike 99.9999% of other measurement equipment _EVERY_ option in 8340B is>> "Remove something" or "Make it worse" (moving connectors to the rear falls>> in the latter category.)>> >> There is no options in 8340B that would've added something or made it >> better>> than basic instrument without options.>> >>> Option 007 is relaxed phase noise, page 1-10.? I guess James Bond wasn't >>> concerned about phase noise!? 3 dB worse across the board except is the >>> same at 100 kHz offset (not surprising as that's probably the PN floor), >>> and 30 Hz offset not specified. Thanks, Bruce. JimSent from my Verizon, >>> Samsung Galaxy smartphone>>> -------- Original message --------From: Bruce <bruce@...> Date: >>> 2/28/20? 4:43 PM? (GMT-08:00) To: [email protected] >>> Subject: Re: [HP-Agilent-Keysight-equipment] 8510C: 8340B vs 83631B Some >>> of the 8340 series that were used with the 8510C have more phase? noise >>> than the "normal" unit - I think this is the Opt 5 version - be? careful >>> and try to avoid Opt 5 if you can - check the documentation to? be sure my >>> mmemory is correct.Quoting Jim Ford <james.ford@...>:> Interesting, >>> Vladan, that the 8340/8341 synths share circuitry with? > the 8566 spec >>> an.? I figured the bottom part of the 8566 was pretty? > much just a >>> synthesized sweeper anyway.? I don't have an 8340 or? > 8341 (yet), but >>> there are a few of the lower frequency versions in? > one of the labs at >>> work, and they do look like the bottom of the? > 8566.? The sloped bottom >>> part of the front panel gives them away.? I? > believe the standalone >>> synths are 5 rack units, though, vs. 3 or 4? > for the bottom of the >>> 8566.>> Jim>> ------ Original Message ------> From: "pianovt via >>> Groups.Io" <pianovt@...>> To: >>> [email protected]> Sent: 2/28/2020 1:20:20 PM> >>> Subject: Re: [HP-Agilent-Keysight-equipment] 8510C: 8340B vs 83631B>>> >>> Here is a brief history. The 8340A was designed in parallel with? >> the >>> 8510A and was intended for use with it. There was no 8360? >> series back >>> then. With time, the 8510 A became the 8510B and at? >> some point the >>> 8340A? become a "B" too. The biggest difference? >> between the A and B >>> versions of the two instruments was the change? >> from a HP proprietary >>> processor to the 68000. Eventually, the 8510B? >> was reworked into the >>> 8510C. While this was going on, a new? >> sweeping syntehsizerseries? was >>> released, the 8360.>>>> The 8360 series had some models which were >>> stripped down,? >> specifically for use with the 8510. Stripped down means >>> they didn't? >> have a standard front panel user interface. They were >>> meant to? >> interact with the 8510 via the system bus only. That kept the >>> cost? >> down for customers who didn't need a stand-alone sweeper or? >> >>> synthesizer.>>>> In the meantime, a lower cost version of the 8340 was >>> introduced,? >> the 8341. It was a 20 GHz synthesizer. However, if you are >>> willing? >> to study the differences and do some work late at night, you >>> can? >> probably make the 8341 do much of what the 8340 does and get it to >>> >> work to 26.5 GHz. The 8341 will work with the 8510 system, but I am? >> >>> not sure which firmware works with what.>>>> The 8340/41 is very heavy, >>> and it has a jet engine style cooling? >> fan. Inside, the frequency >>> synthesis circuits are pretty much the? >> same as what was used in the >>> 8566 spectrum analyzer, but there is? >> also an output section with a >>> multiplier, leveling circuits,? >> modulation etc., in other words all the >>> stuff that's needed to get? >> the signal out. The upside is, many 8566 LO >>> parts can be had for? >> next to nothing, so spare parts are largely >>> available for the? >> synthesizer portion. Documentation is also >>> available. Not so much? >> for the 8360. As far as I know, the alignment >>> and calibration? >> software for the 8360 has not been released to the >>> general public? >> either.>>>> Vladan>>>>>> >> --->> *>> *? KSI@home??? KOI8 Net? < >? The impossible we do immediately.? *>> *? Las Vegas?? NV, USA?? < >? Miracles require 24-hour notice.?? *>> *>> >> >> >>> >>---**? KSI@home??? KOI8 Net? < >? The impossible we do immediately.? **? Las Vegas?? NV, USA?? < >? Miracles require 24-hour notice.?? **

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*

Tim,

?

Don’t have much to go by in a few different 3336 manuals in my possession (looking through PDF files with incomplete sections – don’t have my paper versions handy at the moment) except for a terse statement in manual part number 03336-90000 page 3-2 showing front panel functions & displays.

?

“Alphanumeric Display: Displays the values of the operating parameters, programming error codes, HP-IB address and OSC FAIL if the internal oscillator is not operating properly”

?

There are a multitude of oscillators in this unit but I am assuming the error message relates to the main reference oscillator of which there can either be a lesser accurate type or the high-stability option oscillator.? Does your unit have Option 004 (high-stability oscillator)?? Either way I would hang a scope on the oscillator output and watch it when turning the unit on.

?

Greg

Hi Vladan,

Not true, the Service Support Software P/N 0860-10001 for the 8360 series and the Component Level Repair manuals P/N 08360-90077 exist but very herd to find.

73's
--
Pierre-Fran?ois, F5BQP
JN18AN