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  1. HP-Agilent-Keysight-Equipment
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HP 8594A Spectrum Analyzer - garbled Display after 3.6V battery replacement

 

Hello HP enthusiasts,
I have an HP 8594A spectrum analyzer. One day it greeted me with the dreaded "cal constants lost" message. After replacing the 3.6V AA battery, the analyzer came up fine on first startup. But now, on subsequent boot, the display is garbled. A check with a scope on the video output shows, that that the frequencies are all wrong (frame rate is 4.4Hz instead of 60Hz and line frequency is 9.4kHz instead of 16kHz). I have seen the garbled display before, when going into preset (but after a reboot, the analyzer was fine, so I just didn't use preset...). It seems to me, that the "unfitting preset" setting, is now the power on default? I've already got the 8590A service manual from Artek, but a complication came up - the (A16) cpu board is quite different from the description! It's marked as an "08593-60005". So from an HP8593A? I'm at a bit of an loss here. Since the analyzer comes up fine on first boot, I've had the thought to overwrite the preset with the "actually applied settings" in that moment, but can't find any information on how to "update the preset", so to speak. I hope to find someone here to shed some (or any, really) light on the situation, and revive the analyzer.
Kind regards, Christian
No IF latch when input 1G signal into HP 5350B

 

¿ªÔÆÌåÓý

Dear All

I need ?some help about HP 5350B . NO IF LATCH led and NOT PHASE LATCHED led are all on when 1Ghz signal input to INPUT 1 connector . ?And It can be measured well when 500Mhz signal input to INPUT 2 connector . So i want to know if the GaAs Sampler has damaged and how to check .?

Thanks!

control cart for LODA

 

hello group,
I am looking for an OMs who would have a copy of the implementation of the components and settings of the LODA control card and TRACKING GENERATOR because I do not have it in the manual I have thank you very much ON4LJ Jo?l
Re: HP 3457A FET Transistors

 

> I will get some on order

J3xx fet's should be (used to be ?) pretty cheap, I suggest getting quite a few more than required in case you need to do some matching or parameter binning for e.g. Idss , Vgs etc...


PS Craig, if you could disable your email signature for this list that would be nice; it comes with a bunch of attached images which is annoying and takes longer to load...
Re: 5086-7337 *Yig Oscillator issue*

 

Also I read about this on Kerry Wong blog and CuriousMarc video.

For the first harmonic band I need to place a mixer in the upper path. So the mod only be possible on band 0 (0 to 2.5 GHz)

Because the benefits of leveling circuitry, I'll give it a try for didactic and entertainment purposes, but still not happy with the project...

Regards,
Ruben

HP 83592A BLOCK DIAGRAM.pdf
HP 83592A BLOCK DIAGRAM.pdf

Re: LODA and TG 85644A

 

On Tue, Feb 28, 2023 at 03:41 AM, Jeremy B wrote:
A few years ago I retrofitted the tracking generator option to my 8595E analyzer. I¡¯m pretty sure the LO distribution amplifier (LODA) had a bias value written on the top label. There is a trim pot on the control board for setting the bias. All the information should be in the 8590 series service manual. You just have to fish through it and pick out your applicable unit.
Hello Jeremy,
thank you for your answer I will see on this side there and looked in the manual what is said about the settings to be made thank you very much joel ON4lj
Re: HP 3457A FET Transistors

 

Now that's a plan! I just won a non-functioning HP 5518A Laser head for 200 bucks because I'd always wanted to play with one and was really looking forward to trying to fix it and find out how they worked....changed the (intact looking) fuse but which measured around 250k Ohms...... and the darn thing lit up, locked and worked pretty much to spec.....Oh rats!
Adrian

On 02/03/2023 04:17, Dave McGuire wrote:
I know!? I thought about asking a neighbor to come over and break it, and not tell me how.
Re: HP 3457A FET Transistors

 

That was a good price

Best Regards

CRAIG MAYFIELD | Director - Particle & Environmental Technologies
Alpha Scientific Pty Ltd
Melbourne Office

Phone: (03) 9893 3972
Mobile: 0413 124 589

Email: craig@...
Website: www.alphascientific.com.au



This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire
Sent: Thursday, 2 March 2023 3:17 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors


I know! I thought about asking a neighbor to come over and break it, and not tell me how. But then I just decided to be happy about getting a 3457A for $75. B-)

-Dave

On 3/1/23 19:59, Radu Bogdan Dicher wrote:
Dave - terrible!!! How did you cope with that at the time?.... :)

On Wed, Mar 1, 2023 at 4:55?PM Dave McGuire <mcguire@...
<mailto:mcguire@...>> wrote:

On 3/1/23 19:52, Craig Mayfield wrote:
> OK, thanks David
>
> I assume I can email you back directly, is that correct ?

Sure. But while I own a 3457A, I've never had to repair it, so I
can't help you with your FET issue.

It was frustrating, actually. I bought it on eBay as "broken",
wouldn't power on, and got it very cheap. (like $75) The power switch
was mechanically jammed. I was looking forward to a fun
troubleshooting
session!

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA






--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 3457A FET Transistors

 

I know! I thought about asking a neighbor to come over and break it, and not tell me how. But then I just decided to be happy about getting a 3457A for $75. B-)

-Dave

On 3/1/23 19:59, Radu Bogdan Dicher wrote:
Dave - terrible!!! How did you cope with that at the time?.... :)
On Wed, Mar 1, 2023 at 4:55?PM Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
On 3/1/23 19:52, Craig Mayfield wrote:
> OK, thanks David
>
> I assume I can email you back directly, is that correct ?
? ?Sure.? But while I own a 3457A, I've never had to repair it, so I
can't help you with your FET issue.
? ?It was frustrating, actually.? I bought it on eBay as "broken",
wouldn't power on, and got it very cheap. (like $75) The power switch
was mechanically jammed.? I was looking forward to a fun
troubleshooting
session!
? ? ? ? ? ? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 3457A FET Transistors

 

¿ªÔÆÌåÓý

OK, thanks Ozan

?

I appreciate you valuable input

?

Best Regards

?

CRAIG MAYFIELD | Director - Particle & Environmental Technologies

Alpha Scientific Pty Ltd

Melbourne Office

?

Phone: (03) 9893 3972

Mobile: 0413 124 589

?

Email: craig@...

Website:

?

?

This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.

?

?

From: [email protected] <[email protected]> On Behalf Of Ozan
Sent: Thursday, 2 March 2023 2:22 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors

?

On Wed, Mar 1, 2023 at 06:57 PM, Craig Mayfield wrote:

Hi Ozan

?

That¡¯s excellent news if that¡¯s the one and its directly compatible. I will get some on order asap if you are sure ?

?

---
Hi Craig,
I don't have this equipment and I didn't do any repairs on it so can't give you 100% assurance. However, I gave you the link to Keysight?(I am sure you know HP->Agilent->Keysight connection) part finder for the cross reference. It is as good as it gets for free advice :)

I usually don't recommend replacing parts without checking if they are faulty. However, everyone has a different debug approach.
Ozan

Re: HP 3457A FET Transistors

 

On Wed, Mar 1, 2023 at 06:57 PM, Craig Mayfield wrote:

Hi Ozan

?

That¡¯s excellent news if that¡¯s the one and its directly compatible. I will get some on order asap if you are sure ?

?

---
Hi Craig,
I don't have this equipment and I didn't do any repairs on it so can't give you 100% assurance. However, I gave you the link to Keysight?(I am sure you know HP->Agilent->Keysight connection) part finder for the cross reference. It is as good as it gets for free advice :)

I usually don't recommend replacing parts without checking if they are faulty. However, everyone has a different debug approach.
Ozan
Re: HP 3457A FET Transistors

 

¿ªÔÆÌåÓý

Hi Ozan

?

That¡¯s excellent news if that¡¯s the one and its directly compatible. I will get some on order asap if you are sure ?

?

Best Regards

?

CRAIG MAYFIELD | Director - Particle & Environmental Technologies

Alpha Scientific Pty Ltd

Melbourne Office

?

Phone: (03) 9893 3972

Mobile: 0413 124 589

?

Email: craig@...

Website:

?

?

This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.

?

?

From: [email protected] <[email protected]> On Behalf Of Ozan
Sent: Thursday, 2 March 2023 1:37 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors

?

On Wed, Mar 1, 2023 at 06:06 PM, Craig Mayfield wrote:

Hi Ozan

?

Yes, I did. If I don¡¯t, it comes up with an error 264. By doing the calibration, I am only left with an error 256. I then adjust the flatness pot and can get it to ¡°0¡± PASS maybe 9 seconds out of 10 and then it fails once and then passes again and again and occasionally fails again. When I do the self test, it FAILS every time with 256

?

This guy has 3 videos in a series which were helpful. He replaced the FETS and the problem was eliminated. He seems to be having the same issue as me. I just don¡¯t know which FETS he used and Keysight can¡¯t tell me

?

?

?

---
Hi Craig,
Debugging the actual issue is more fun and I am sure Dave would agree but the transistor can be found by searching Keysight:



Database says it is a J304. Mouser in US has them, I don't know about the distributors in Australia.

Ozan

Re: HP 3457A FET Transistors

 

On Wed, Mar 1, 2023 at 06:06 PM, Craig Mayfield wrote:

Hi Ozan

?

Yes, I did. If I don¡¯t, it comes up with an error 264. By doing the calibration, I am only left with an error 256. I then adjust the flatness pot and can get it to ¡°0¡± PASS maybe 9 seconds out of 10 and then it fails once and then passes again and again and occasionally fails again. When I do the self test, it FAILS every time with 256

?

This guy has 3 videos in a series which were helpful. He replaced the FETS and the problem was eliminated. He seems to be having the same issue as me. I just don¡¯t know which FETS he used and Keysight can¡¯t tell me

?

https://www.youtube.com/watch?v=5HSO3A_lZUo

?

?

---
Hi Craig,
Debugging the actual issue is more fun and I am sure Dave would agree but the transistor can be found by searching Keysight:



Database says it is a J304. Mouser in US has them, I don't know about the distributors in Australia.

Ozan
Re: HP 3457A FET Transistors

 

¿ªÔÆÌåÓý

Hi Ozan

?

Yes, I did. If I don¡¯t, it comes up with an error 264. By doing the calibration, I am only left with an error 256. I then adjust the flatness pot and can get it to ¡°0¡± PASS maybe 9 seconds out of 10 and then it fails once and then passes again and again and occasionally fails again. When I do the self test, it FAILS every time with 256

?

This guy has 3 videos in a series which were helpful. He replaced the FETS and the problem was eliminated. He seems to be having the same issue as me. I just don¡¯t know which FETS he used and Keysight can¡¯t tell me

?

https://www.youtube.com/watch?v=5HSO3A_lZUo

?

Best Regards

?

CRAIG MAYFIELD | Director - Particle & Environmental Technologies

Alpha Scientific Pty Ltd

Melbourne Office

?

Phone: (03) 9893 3972

Mobile: 0413 124 589

?

Email: craig@...

Website:

?

?

This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.

?

?

From: [email protected] <[email protected]> On Behalf Of Ozan
Sent: Thursday, 2 March 2023 1:00 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors

?

On Wed, Mar 1, 2023 at 04:42 PM, Craig Mayfield wrote:

?

I have only just joined this group earlier today and am still trying to work out how to navigate my way around

?

I have a HP 3457A and it keeps giving me an error 256. I have replaced the filter caps and followed the steps in as shown in a series of YouTube videos and I can get the diagnostic 8 to pass most of the time, however it then fails. On the YouTube series, the guy replaced 6 of the FETS as shown in the attached document. I am trying to find modern equivalents of these to order them. I have contacted Keysight and Element 14 to no avail. Can someone suggest a part number and or brand of FET I can use which should do the job as per the manufacturers original specs ?

----
Hi Craig,
Service manual says

"8-49. Front end zero measurement errors (error code 16) and AC flatness test errors (error code 256) can often be remedied by calibration. Refer to Section V for the appropriate procedures."

Did you try doing an AC calibration first?

Ozan

Re: HP 3457A FET Transistors

 

On Wed, Mar 1, 2023 at 04:42 PM, Craig Mayfield wrote:

?

I have only just joined this group earlier today and am still trying to work out how to navigate my way around

?

I have a HP 3457A and it keeps giving me an error 256. I have replaced the filter caps and followed the steps in as shown in a series of YouTube videos and I can get the diagnostic 8 to pass most of the time, however it then fails. On the YouTube series, the guy replaced 6 of the FETS as shown in the attached document. I am trying to find modern equivalents of these to order them. I have contacted Keysight and Element 14 to no avail. Can someone suggest a part number and or brand of FET I can use which should do the job as per the manufacturers original specs ?

----
Hi Craig,
Service manual says

"8-49. Front end zero measurement errors (error code 16) and AC flatness test errors (error code 256) can often be remedied by calibration. Refer to Section V for the appropriate procedures."

Did you try doing an AC calibration first?

Ozan
Re: HP 3457A FET Transistors

 

¿ªÔÆÌåÓý

OK, thanks Radu, that would be great ?

?

Best Regards

?

CRAIG MAYFIELD | Director - Particle & Environmental Technologies

Alpha Scientific Pty Ltd

Melbourne Office

?

Phone: (03) 9893 3972

Mobile: 0413 124 589

?

Email: craig@...

Website:

?

?

This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.

?

?

From: [email protected] <[email protected]> On Behalf Of Radu Bogdan Dicher
Sent: Thursday, 2 March 2023 12:23 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors

?

Craig,

Kidding aside, I'm sure you'll get good help here with your repair.

Radu.?

?

On Wed, Mar 1, 2023 at 5:02?PM Craig Mayfield <craig@...> wrote:

Ahh, OK, thanks Dave

Best Regards

CRAIG MAYFIELD | Director - Particle & Environmental Technologies
Alpha Scientific Pty Ltd
Melbourne Office

Phone: (03) 9893 3972
Mobile: 0413 124 589

Email: craig@...
Website:



This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.



-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire
Sent: Thursday, 2 March 2023 11:55 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors

On 3/1/23 19:52, Craig Mayfield wrote:
> OK, thanks David
>
> I assume I can email you back directly, is that correct ?

? ?Sure.? But while I own a 3457A, I've never had to repair it, so I can't help you with your FET issue.

? ?It was frustrating, actually.? I bought it on eBay as "broken", wouldn't power on, and got it very cheap. (like $75) The power switch was mechanically jammed.? I was looking forward to a fun troubleshooting session!

? ? ? ? ? ? -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 3457A FET Transistors

 

Craig,
Kidding aside, I'm sure you'll get good help here with your repair.
Radu.?

On Wed, Mar 1, 2023 at 5:02?PM Craig Mayfield <craig@...> wrote:
Ahh, OK, thanks Dave

Best Regards

CRAIG MAYFIELD | Director - Particle & Environmental Technologies
Alpha Scientific Pty Ltd
Melbourne Office

Phone: (03) 9893 3972
Mobile: 0413 124 589

Email: craig@...
Website:



This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.



-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire
Sent: Thursday, 2 March 2023 11:55 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors

On 3/1/23 19:52, Craig Mayfield wrote:
> OK, thanks David
>
> I assume I can email you back directly, is that correct ?

? ?Sure.? But while I own a 3457A, I've never had to repair it, so I can't help you with your FET issue.

? ?It was frustrating, actually.? I bought it on eBay as "broken", wouldn't power on, and got it very cheap. (like $75) The power switch was mechanically jammed.? I was looking forward to a fun troubleshooting session!

? ? ? ? ? ? -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 3457A FET Transistors

 

Ahh, OK, thanks Dave

Best Regards

CRAIG MAYFIELD | Director - Particle & Environmental Technologies
Alpha Scientific Pty Ltd
Melbourne Office

Phone: (03) 9893 3972
Mobile: 0413 124 589

Email: craig@...
Website: www.alphascientific.com.au



This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire
Sent: Thursday, 2 March 2023 11:55 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors

On 3/1/23 19:52, Craig Mayfield wrote:
OK, thanks David

I assume I can email you back directly, is that correct ?
Sure. But while I own a 3457A, I've never had to repair it, so I can't help you with your FET issue.

It was frustrating, actually. I bought it on eBay as "broken", wouldn't power on, and got it very cheap. (like $75) The power switch was mechanically jammed. I was looking forward to a fun troubleshooting session!

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 3457A FET Transistors

 

Dave - terrible!!! How did you cope with that at the time?.... :)


On Wed, Mar 1, 2023 at 4:55?PM Dave McGuire <mcguire@...> wrote:
On 3/1/23 19:52, Craig Mayfield wrote:
> OK, thanks David
>
> I assume I can email you back directly, is that correct ?

? ?Sure.? But while I own a 3457A, I've never had to repair it, so I
can't help you with your FET issue.

? ?It was frustrating, actually.? I bought it on eBay as "broken",
wouldn't power on, and got it very cheap. (like $75) The power switch
was mechanically jammed.? I was looking forward to a fun troubleshooting
session!

? ? ? ? ? ? -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 3457A FET Transistors

 

On 3/1/23 19:52, Craig Mayfield wrote:
OK, thanks David
I assume I can email you back directly, is that correct ?
Sure. But while I own a 3457A, I've never had to repair it, so I can't help you with your FET issue.

It was frustrating, actually. I bought it on eBay as "broken", wouldn't power on, and got it very cheap. (like $75) The power switch was mechanically jammed. I was looking forward to a fun troubleshooting session!

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
18801 - 18820 of 151550