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Date
Re: HP 427A no DC offset adj. pot

 

Adding it to the files would be great David when you can. I contacted that eBay seller to ask if his offer was an original or reprint since no actual photo was shown. He did reply that it was no longer available and that was all. Was yours govt. surplus as well? ?The calibration sticker on mine stated “Battery not used”. I wonder if the manual you have reflects that?

尝别辞苍…
Re: Caution: No IF Found

 

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The manuals don’t specify the levels buy it would be more than -10dBm for all frequencies it is working. The low band of sweeper don’t uses SRD. In my case over 6GHz the level drops very fast as frequency increases.?
A good starting point is to run a self test. As result you will find a troubleshooting code RF.XXX , I can scan the part of the manual and send to you.?

Ing. Patricio A. Greco
Taller Aeronáutico de Reparación 1B-349
Organización de Mantenimiento?Aeronáutico de la Defensa OMAD-001
Laboratorio de Calibración ISO 17025?AREA: RF/MW?
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T: +5411-4455-2557
F: +5411-4032-0072




On 4 Apr 2024, at 06:47, shaider.msee20seecs via <shaider.msee20seecs@...> wrote:

On Thu, Apr 4, 2024 at 04:47 AM, Patricio A. Greco wrote:
Thank you for your suggestions everyone.

Patricio you mentioned that i should measure the output of this module. In Ideal case, what am i supposed to see at the aux output?
Best Regards

Re: Looking for a copy of the 4263B Adjustment Program, part number 04263-65005

 

Still looking....

I sent emails to a bunch of cal labs that made mention of the 4263 on their webpages, but of those that got back to me, some tried to sell me stuff, the others were unable to help.

So, the hunt continues.....



Jared
Re: Caution: No IF Found

 

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I’ll scan the task on my troubleshooting manual . I’ll send it to you in a couple of hours when I reach to my lab.?
Ing. Patricio A. Greco
Taller Aeronáutico de Reparación 1B-349
Organización de Mantenimiento Aeronáutico de la Defensa OMAD-001
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T:?+5411-4455-2557
F:?+5411-4032-0072

On 4 Apr 2024, at 08:20, shaider.msee20seecs via groups.io <shaider.msee20seecs@...> wrote:

?On Thu, Apr 4, 2024 at 04:47 AM, Patricio A. Greco wrote:
Thank you for your suggestions everyone.

Patricio you mentioned that i should measure the output of this module. In Ideal case, what am i supposed to see at the aux output?
Best Regards

Re: Caution: No IF Found

 

On Thu, Apr 4, 2024 at 04:47 AM, Patricio A. Greco wrote:
Thank you for your suggestions everyone.

Patricio you mentioned that i should measure the output of this module. In Ideal case, what am i supposed to see at the aux output?
Best Regards
Re: HP 427A no DC offset adj. pot

 

There is no link, it's not on the web as far as I know.
I went for a walk to the storage unit yesterday, looked through various boxes and couldn't find the manual, once home I found it in the pile next to the washing machine.
It wouldn't have helped me last week with fixing mine, the rechargeable battery option is not covered, nor are intermittent shorts of the negative battery connection, caused by a previous user/owner.

If no one else has scanned this manual, I'll add it to the queue of jobs to do, it was bought from the now defunct Manualsplus, only one listed on ebay at the moment is quite expensive.

David
Re: Caution: No IF Found

 

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I had the same problem with my 8510C. Normally the problem is the SAF module . It has a SRD and high power amplifier that drives it . One of these components uses to get fried . This is before the leveling amplifier you say. To troubleshoot the failure I recommend you measure the output of this module , there are an auxiliar RF out in the rear side of 8360. There are a troubleshooting manual for this unit I recommend to buy a copy.?
The same failure behavior happena of the VTO unit failes on test set 8515a / 8517a . There are also a STD inside that drives the samplers…?

Ing. Patricio A. Greco
Taller Aeronáutico de Reparación 1B-349
Organización de Mantenimiento Aeronáutico de la Defensa OMAD-001
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T:?+5411-4455-2557
F:?+5411-4032-0072

On 3 Apr 2024, at 18:58, shaider.msee20seecs via groups.io <shaider.msee20seecs@...> wrote:

?

Hi All,

Thank you for adding me to the group. I have HP 8510C which is given me “Caution: No IF found” and when it tries to measure higher frequency (say above 5 GHz) then the signal gets acquisition becomes slow and distorted.?

From a service manual i saw that it occurs when power is very low about -20dB but in my case i had set to -5dBm. I tried increasing the power but all in vain.?

I suspected that there might be issue with source. It comes with 8360 swept series synthesiser which i have one going upto 20GHz and other going upto 50 GHz.?

I connected spectrum analyzer at the output of the source synthesizer (50GHz option) and saw really less power of about -39dBm @5GHz with a 10db attenuator.

I did the same steps with source synthesizer (20GHz option) but saw a higher power at @5GHz. Thus, i knew something was wrong with source synth (50GHz option).

After that, i disassembled the source top panel to see if i can detect a faulty connection/ component. I noticed the last component in the chain is a component named 5086-7603. I believe its an amplifier that also provides power levelling (need anyone of you to confirm that).?

I then proceeded to disconnect the input of this component and connected it directly to spectrum analyser and saw power was -34dbm which was 5dbm better than what i measured before (39dbm).?

I have so far established that this component might be faulty. I would like to know from your experience if you can guide me further on this with any suggestions. Share any block diagram of the swept series synthesiser.?

Any suggestions to fix this issue are most welcome.

Thanks

<IMG_7343.jpeg>
<IMG_7339.jpeg>
<IMG_7342.jpeg>
<IMG_7333.jpeg>
Re: HP 427A no DC offset adj. pot

 

Outstanding David,
Where did you find it? Do you have a link? ?I have pulled my hair out searching for hours, try all manner of search terms. ?Grateful for the diagrams you posted.?

尝别辞苍…
Re: HP 3580A lifespan 1973 to 1990

 

Not in the 92.? They shifted gears to " signal analyzers " . Have the 80A and 81A and use them in?
phase noise test sets. Knobs, knock on plastic... still all good. Turn em slooowly! Love?
the adaptive sweep!?
Re: Caution: No IF Found

 

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According to Keysight the 5086-7603 is a “bridge detector 2.4mm”, no mention of it being an amplifier and detector. I think your problem is before that detector if it only has -34 dbm coming into it.?


Steve



On Apr 3, 2024, at 4:58?PM, shaider.msee20seecs via groups.io <shaider.msee20seecs@...> wrote:

?

Hi All,

Thank you for adding me to the group. I have HP 8510C which is given me “Caution: No IF found” and when it tries to measure higher frequency (say above 5 GHz) then the signal gets acquisition becomes slow and distorted.?

From a service manual i saw that it occurs when power is very low about -20dB but in my case i had set to -5dBm. I tried increasing the power but all in vain.?

I suspected that there might be issue with source. It comes with 8360 swept series synthesiser which i have one going upto 20GHz and other going upto 50 GHz.?

I connected spectrum analyzer at the output of the source synthesizer (50GHz option) and saw really less power of about -39dBm @5GHz with a 10db attenuator.

I did the same steps with source synthesizer (20GHz option) but saw a higher power at @5GHz. Thus, i knew something was wrong with source synth (50GHz option).

After that, i disassembled the source top panel to see if i can detect a faulty connection/ component. I noticed the last component in the chain is a component named 5086-7603. I believe its an amplifier that also provides power levelling (need anyone of you to confirm that).?

I then proceeded to disconnect the input of this component and connected it directly to spectrum analyser and saw power was -34dbm which was 5dbm better than what i measured before (39dbm).?

I have so far established that this component might be faulty. I would like to know from your experience if you can guide me further on this with any suggestions. Share any block diagram of the swept series synthesiser.?

Any suggestions to fix this issue are most welcome.

Thanks

<IMG_7343.jpeg>
<IMG_7339.jpeg>
<IMG_7342.jpeg>
<IMG_7333.jpeg>
HP 3580A lifespan 1973 to 1990

 

>Anyone having a clue to the last date of manufacture of the HP 3580A ?

After checking some HP Catalogues I think the last time the 3580A is shown is 1990.

And I knew that it all started in 1973.

So 1973 to 1990.

17 years for sale...

Very nice spectrum analyzer...bought mine in 1975.

Only problem so far... the knobs cracks and look not so nice.


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



Best regards,

Goran Finnberg
The Mastering Room AB
Goteborg
Sweden

E-mail: mastering@...

Learn from the mistakes of others, you can never live long enough to
make them all yourself.??? -?? John Luther

(\__/)
(='.'=)
(")_(") Pyret, Ranglet, Aron, VovVov, Nero, Smurfen & Pussin:RIP
Re: HP8757C CORRUPTED EEPROM

 

That's great!

Have fun :)

On 03/04/2024 23:35, YO4HFU via groups.io wrote:
Your files welcome received and successfully tested. Both EEPROMs (U4 &
U26) were required to be written. Actual level accuracy was -1dB for all
channels. Investigating your files I understood that I need to modify
both EEPROMs using the good calibrations values from my channel A.

The result is more than satisfactory, less than 0.4dB error (B & R) and
good linearity. Machine recovered and ready to use.

73, Noroc!

Robert
Caution: No IF Found

 

Hi All,

Thank you for adding me to the group. I have HP 8510C which is given me “Caution: No IF found” and when it tries to measure higher frequency (say above 5 GHz) then the signal gets acquisition becomes slow and distorted.?

From a service manual i saw that it occurs when power is very low about -20dB but in my case i had set to -5dBm. I tried increasing the power but all in vain.?

I suspected that there might be issue with source. It comes with 8360 swept series synthesiser which i have one going upto 20GHz and other going upto 50 GHz.?

I connected spectrum analyzer at the output of the source synthesizer (50GHz option) and saw really less power of about -39dBm @5GHz with a 10db attenuator.

I did the same steps with source synthesizer (20GHz option) but saw a higher power at @5GHz. Thus, i knew something was wrong with source synth (50GHz option).

After that, i disassembled the source top panel to see if i can detect a faulty connection/ component. I noticed the last component in the chain is a component named 5086-7603. I believe its an amplifier that also provides power levelling (need anyone of you to confirm that).?

I then proceeded to disconnect the input of this component and connected it directly to spectrum analyser and saw power was -34dbm which was 5dbm better than what i measured before (39dbm).?

I have so far established that this component might be faulty. I would like to know from your experience if you can guide me further on this with any suggestions. Share any block diagram of the swept series synthesiser.?

Any suggestions to fix this issue are most welcome.

Thanks
Re: HP8757C CORRUPTED EEPROM

 

Your files welcome received and successfully tested. Both EEPROMs (U4 & U26) were required to be written. Actual level accuracy was -1dB for all channels. Investigating your files I understood that I need to modify both EEPROMs using the good calibrations values from my channel A.

The result is more than satisfactory, less than 0.4dB error (B & R) and good linearity. Machine recovered and ready to use.

73, Noroc!

Robert

?
Re: HP8757C CORRUPTED EEPROM

 

Hello Robert,

I desoldered my EEPROMs and made the backup.
You can find the EEPROM dump attached to this email.
As a note my 8757C has 3 channels only.

I hope it helps to recover your machine.
Let me know if you need anything else.

73!
Razvan

On 03/04/2024 14:22, YO4HFU via groups.io wrote:
Hello Razvan,
Thanks for reply. I will wait for your EEPROM files, if is possible.?I
don't expect to get the initial accuracy, but could find a compromise.
In meantime I identified the memory areas for each channel and "fixed"
by copy/paste from channel A (which is good) to B and R. I cleared the
warning for channel R but channel B has still active error.
So the problem is confirmed, corrupted EEPROM... No more ideas, I don't
know exactly bit functions, even here on group there are some vague
references about (ID, Checksum, etc)
HP8757E EEPROMs file found on KO4BB website already tested,
unfortunately are not compatible with C version.
73, Robert

8757C_EEPROM_Backup_3CH_A-B-R.zip
8757C_EEPROM_Backup_3CH_A-B-R.zip

Re: HP 140 Series Fan Noise

 

I figured at least part of it was humor but I wasn't sure about the option number. I actually thought might have been a real option on some piece of equipment that could cause the strangling hamster sound.

Barry - N4BUQ

Apparently not. I assumed that the hamster reference would be the
giveaway, but alas... :)

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070


On 4/3/2024 9:26 AM, Roy J. Tellason, Sr. wrote:
On Tuesday 02 April 2024 05:03:32 pm n4buq wrote:
I don't know what that option is.

You must have an Opt 101X (aka "strangling hamster").
Humor?
Re: HP 140 Series Fan Noise

 

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Yep, like a lawnmower I used to have.? Before I found out I have a grass allergy and hired a crew to mow my lawns.? ?FWIW.? ? ? ? ?Jim Ford?



Sent from my T-Mobile 4G LTE Device


-------- Original message --------
From: "Roy J. Tellason, Sr." <roy@...>
Date: 4/3/24 9:59 AM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] HP 140 Series Fan Noise

On Wednesday 03 April 2024 11:56:31 am Harvey White wrote:
> It used to be that for the older tek equipment (500 series scopes), you
> washed the filter then sprayed it with something that acted like a dust
> magnet.

This is probably why a lot of outdoor power equipment that uses a foam-type of filter calls for adding oil to that filter,? to catch the dust...

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Re: HP 140 Series Fan Noise

 

Apparently not. I assumed that the hamster reference would be the giveaway, but alas... :)

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070

On 4/3/2024 9:26 AM, Roy J. Tellason, Sr. wrote:
On Tuesday 02 April 2024 05:03:32 pm n4buq wrote:
I don't know what that option is.

You must have an Opt 101X (aka "strangling hamster").
Humor?
Re: HP 140 Series Fan Noise

 

I think that the idea is that the rushing air is used to create an electrostatic charge.? There are furnace filters like that.? No idea if it works.? I think what Tek used just made it sticky.

Harvey

On 4/3/2024 12:56 PM, Dave McGuire wrote:
On 4/3/24 11:56, Harvey White wrote:
It used to be that for the older tek equipment (500 series scopes), you washed the filter then sprayed it with something that acted like a dust magnet.
? At LSSM we've been using this product:



? Of course the "Turns an Ordinary Filter into an ELECTROSTATIC Filter!" claim is complete BS; a good trick with no power source. But I have to say, it is very effective.? The next time I clean the filters on my fleet of Tek 500-series scopes, I'll definitely use some.

?(no affiliation, etc)

?????????? -Dave
Re: HP 140 Series Fan Noise

 

On Wednesday 03 April 2024 11:56:31 am Harvey White wrote:
It used to be that for the older tek equipment (500 series scopes), you
washed the filter then sprayed it with something that acted like a dust
magnet.
This is probably why a lot of outdoor power equipment that uses a foam-type of filter calls for adding oil to that filter, to catch the dust...

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
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