hello , have a nice working spectrum 8558b with electron beam memory? , all is correct have checked , but the issue the time division switch does not work , in auto mode, , opened it and found a missing part in the switch , from the service manual sent with this spectrum analyser from new only 40 years ago part number is 5061-5425 pronger switch , it is the metal leaf part which is missing , checked and did not find it anywhere , so question is does anyone have or make these ? thanks





!DSPAM:5d6ee55b212076544458839!

As a quick alternative you could slide the feet off the one with feet and put some 3M "bump-on" or similar self adhesive feet / bumpers on both so they match. Target sell the 3M bumpers for less than $5 a pack

(I'm English and I knew that Target sold them :-)
Robert G8RPI

What do the "@" signs mean?
And what is FFF?

I have never seen these used before.

Glenn

@Steve H., great story...
@Paul B : I got what appears to be FFF identical to the original battery here:??

?

-----------------------------------------------------------------------

Glenn Little?????? ?????????ARRL Technical Specialist?? QCWA? LM 28417

Amateur Callsign:? WB4UIV??????????? wb4uiv@...??? AMSAT LM 2178

QTH:? Goose Creek, SC USA (EM92xx)? USSVI LM?? NRA LM?? SBE ARRL TAPR

"It is not the class of license that the Amateur holds but the class

of the Amateur that holds the license" 

No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.

I have a 3336B that seems to be made of parts from both an A and B unit, but had the optional high performance ovenized oscillator installed (hp pcb 03325-66509) which is an Ovenaire OSC 73-52.

sadly for me, while I got everything else up and running correctly, the Ovenaire oscillator is WAY off frequency (+250hz), and can't be adjusted via the EFC or mechanical adjustment. if I use the external clock input, everything works correctly, with no offset.

Does anybody have either a good spare board or the Ovenaire oscillator available? Happy to buy or swap parts.

it has one other odd issue I have not seen before in any hp synthesized generator, it has a flutter or approximately 0.5-1Hz up and down (residual FM) at 10Mhz out. Is this some kind of loop instability that can be adjusted, or just how it works? my 5335A easily resolves 0.01Hz at this frequency, so this is very visible to me.

all help appreciated (best off list),
-walter (walter2 -at- )
sphere research corp.

I have a 3336B that seems to be made of parts from both an A and B unit, but had the optional high performance ovenized oscillator installed (hp pcb 03325-66509) which is an Ovenaire OSC 73-52.

sadly for me, while I got everything else up and running correctly, the Ovenaire oscillator is WAY off frequency (+250hz), and can't be adjusted via the EFC or mechanical adjustment. if I use the external clock input, everything works correctly, with no offset.

Does anybody have either a good spare board or the Ovenaire oscillator available? Happy to buy or swap parts.

it has one other odd issue I have not seen before in any hp synthesized generator, it has a flutter or approximately 0.5-1Hz up and down (residual FM) at 10Mhz out. Is this some kind of loop instability that can be adjusted, or just how it works? my 5335A easily resolves 0.01Hz at this frequency, so this is very visible to me.

all help appreciated (best off list),
-walter (walter2 -at- sphere.bc.ca)
sphere research corp.

@Steve H., great story...
@Paul B : I got what appears to be FFF identical to the original battery here:??

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license" 

Component Level Information Package.

Document with the schematics of a Hewlett Packard TMI.

With best regards
Tam HANNA 

Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at  

Uh, dumb question:? what is the clip?? Or CLIP?

Thanks.?

Jim Ford?

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------

From: "Dave_G0WBX via Groups.Io" <g8kbvdave@...>

Date: 9/2/19 1:47 AM (GMT-08:00)

To: [email protected]

Subject: Re: [HP-Agilent-Keysight-equipment] HP8714B source module extender needed

From: hp70000freak
Date: Sun, 01 Sep 2019 06:57:29 PDT

Hello,

I had the same issue long time ago. It was a faulty RF amplifier stage. As far as I can remember schematics are in the net and the amplifier was something like ATF 53142 or so.?

I soldered thin coax onto the board in order to pickup the signal stage by stage and find the fault.

?Cheers,

---

Hi.

Thanks for that, and yes I suspect it's just an internal amplification issue.

Yes, I also found some schematics in the past, but also note that ArtekManuals have the full service manual + clip.

??? ????? and just put 8714B in the search box.

Need to find some space to do stuff like this, as those modules with the covers removed (for access) are rather vulnerable to mechanical damage.

Regards to All.

Dave B

(G0WBX)

-- 
Created on and sent from a Unix like PC running and using free and open source software:

What do the "@" signs mean?
And what is FFF?

I have never seen these used before.

Glenn

On 9/3/2019 11:16 AM, victor smith wrote:

@Steve H., great story...
@Paul B : I got what appears to be FFF identical to the original battery here:??

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license" 

At 2019-09-02 04:50 PM, Richard Knoppow wrote:

?? Assuming the battery test shows the voltage under load I wonder if the old battery got noisy. Batteries do sometimes. I was taught that putting a capacitor across a battery may be good practice because it shorts out the noise. Perhaps does not apply to this device.

This may or may not be relevant to your situation, but I recall a bizarre problem quite a while back (this would have been in the late 1980's) where a purchased CPU board we used in a design as a subcontractor to a prime contractor for NASA, used a primary lithium coin cell as a memory backup battery. After the unit ran continuously and flawlessly for a couple of months, at somewhat elevated temperatures, it started having random resets, becoming worse over time, until it wouldn't boot at all. Since it took months to duplicate, you can well imagine it was tedious to troubleshoot.

It turned out that the designers of that CPU board also used the backup battery as a reference voltage for the power-fail comparator. Running at elevated temps (around 100F / 30C or thereabouts as I recall), the diode used to switch in the backup battery leaked about 1 ?A. This was enough to slowly "charge" the non-rechargeable battery, causing its output voltage to slowly rise, over a period of months. Eventually it got high enough to make the comparator see the main supply voltage pretty close to the reference, and all it took was a little noise to trigger a power-fail reset. As the battery voltage continued to rise, it took less and less noise, so resets became more frequent until they became continuous.

IIRC our solution was to add a 1 megohm resistor across the battery, guaranteeing that it was never charged by diode leakage. This of course meant that under most conditions it had a slightly increased discharge rate, but the battery was way over-specified, with a theoretical lifetime in centuries, so we didn't care about the additional discharge.

Steve Hendrix