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Expanded Topics Messages
Date
Re: 34401A issue

 

This does seem to be a problem, I have seen quite a lot go over time..
It must be the composition of the plastic...

I guess 3D print is the way forward as most other mouldings might suffer from the same degradation...
Regards
Nigel

Sent from my iPad by banging a nail into a piece of wood...

On 13 Mar 2025, at 20:47, Peter Gottlieb via groups.io <hpnpilot@...> wrote:

Interesting observation. The rear plastic piece (with the 2 screws) on the case cracked. I went to glue it and found it to be completely brittle and crumbling with even the slightest pressure from my fingers.

Has anyone else seen this? I wonder if all those plastic case pieces are going to fail?

Peter


On 3/13/2025 4:18 PM, Razvan Popescu via groups.io wrote:
Hi Peter,

I am glad you fixed it!

Best regards,
Razvan

On 13/03/2025 21:01, Peter Gottlieb via groups.io wrote:
Update:

Relays arrived. I replaced the failed relay and also put in a new display.

The instrument is back to proper operation with a nice bright display.

Thanks for the likely cause!

Peter


On 3/9/2025 4:17 PM, Peter Gottlieb wrote:
I saw three and ordered two to have a spare. Since I have three of
this meter and now know about how they can fail I can just replace
them as needed.

On 3/9/2025 3:39 PM, Razvan Popescu via groups.io wrote:
Hi Peter,

If I am not mistaken there are 2 Omron relays on the board. If one
failed maybe the other one will fail soon so if you make an order and
have the unit open it is better to replace both.

Regards,
Razvan

On 09/03/2025 20:17, Peter Gottlieb via groups.io wrote:
I have tracked this down to K104 and confirmed by bench test the relay
has a bad side and won't make continuity to the DC high range
attenuator. With the relay removed I can jumper pins 9 to 13 and get a
voltage reading on the higher range which confirms the rest of the
meter
works.
This is an Omron G6AK-274P-STLT-US-5VDC which is commonly available. I
will get one on order from Mouser.
Peter
Re: Spring Cleaning----HP Microwave Seminar... Scan and Post

 

Done.? ?Thanks Ron??
Re: CLIP / Firmware for HP83751A/HP83752A

 

I f you find any manuals it is always best to look if this sight has it also if you have found a different version (later copy ) or ones with circuit diagrams as the circuit diagrams where deleted in a lot of service manuals? that is before the CLIPS came into operation so best to up lode them to this sight
as thy have a tendency to disappear form sights?
Re: 34401A issue

 

Interesting observation.? The rear plastic piece (with the 2 screws) on the case cracked.? I went to glue it and found it to be completely brittle and crumbling with even the slightest pressure from my fingers.

Has anyone else seen this?? I wonder if all those plastic case pieces are going to fail?

Peter

On 3/13/2025 4:18 PM, Razvan Popescu via groups.io wrote:
Hi Peter,

I am glad you fixed it!

Best regards,
Razvan

On 13/03/2025 21:01, Peter Gottlieb via groups.io wrote:
Update:

Relays arrived.? I replaced the failed relay and also put in a new display.

The instrument is back to proper operation with a nice bright display.

Thanks for the likely cause!

Peter


On 3/9/2025 4:17 PM, Peter Gottlieb wrote:
I saw three and ordered two to have a spare.? Since I have three of
this meter and now know about how they can fail I can just replace
them as needed.

On 3/9/2025 3:39 PM, Razvan Popescu via groups.io wrote:
Hi Peter,

If I am not mistaken there are 2 Omron relays on the board. If one
failed maybe the other one will fail soon so if you make an order and
have the unit open it is better to replace both.

Regards,
Razvan

On 09/03/2025 20:17, Peter Gottlieb via groups.io wrote:
I have tracked this down to K104 and confirmed by bench test the relay
has a bad side and won't make continuity to the DC high range
attenuator.? With the relay removed I can jumper pins 9 to 13 and get a
voltage reading on the higher range which confirms the rest of the
meter
works.
This is an Omron G6AK-274P-STLT-US-5VDC which is commonly available.? I
will get one on order from Mouser.
Peter
Re: CLIP / Firmware for HP83751A/HP83752A

 

"Paul Bicknell" <admin@...> writes:

I have uploaded the service manual to this sight for you sorry no CLIP
I had that already, but still a good idea to back it up in the files
section. Thanks!
Re: CLIP / Firmware for HP83751A/HP83752A

 

I have uploaded the service manual to this sight for you sorry no CLIP
Re: 34401A issue

 

Hi Peter,

I am glad you fixed it!

Best regards,
Razvan

On 13/03/2025 21:01, Peter Gottlieb via groups.io wrote:
Update:

Relays arrived.? I replaced the failed relay and also put in a new display.

The instrument is back to proper operation with a nice bright display.

Thanks for the likely cause!

Peter


On 3/9/2025 4:17 PM, Peter Gottlieb wrote:
I saw three and ordered two to have a spare.? Since I have three of
this meter and now know about how they can fail I can just replace
them as needed.

On 3/9/2025 3:39 PM, Razvan Popescu via groups.io wrote:
Hi Peter,

If I am not mistaken there are 2 Omron relays on the board. If one
failed maybe the other one will fail soon so if you make an order and
have the unit open it is better to replace both.

Regards,
Razvan

On 09/03/2025 20:17, Peter Gottlieb via groups.io wrote:
I have tracked this down to K104 and confirmed by bench test the relay
has a bad side and won't make continuity to the DC high range
attenuator.? With the relay removed I can jumper pins 9 to 13 and get a
voltage reading on the higher range which confirms the rest of the
meter
works.
This is an Omron G6AK-274P-STLT-US-5VDC which is commonly available.? I
will get one on order from Mouser.
Peter
Re: 34401A issue

 

Update:

Relays arrived.? I replaced the failed relay and also put in a new display.

The instrument is back to proper operation with a nice bright display.

Thanks for the likely cause!

Peter

On 3/9/2025 4:17 PM, Peter Gottlieb wrote:
I saw three and ordered two to have a spare.? Since I have three of this meter and now know about how they can fail I can just replace them as needed.

On 3/9/2025 3:39 PM, Razvan Popescu via groups.io wrote:
Hi Peter,

If I am not mistaken there are 2 Omron relays on the board. If one
failed maybe the other one will fail soon so if you make an order and
have the unit open it is better to replace both.

Regards,
Razvan

On 09/03/2025 20:17, Peter Gottlieb via groups.io wrote:
I have tracked this down to K104 and confirmed by bench test the relay
has a bad side and won't make continuity to the DC high range
attenuator.? With the relay removed I can jumper pins 9 to 13 and get a
voltage reading on the higher range which confirms the rest of the meter
works.
This is an Omron G6AK-274P-STLT-US-5VDC which is commonly available.? I
will get one on order from Mouser.
Peter
CLIP / Firmware for HP83751A/HP83752A

 

Hi,

i got a HP83752A sweeper and want to retrofit the Mechanical Attenuator
Option (1E1). I have a matching Attenuator, but i'm wondering how to
enable it. There's a Keysight Document telling how to do that for Option
1E5 (Internal 10MHz timebase), but none for 1E1.

Does anyone know how to enable that Option? Also does someone have a
CLIP for these units? I only found service guides without schematics.

If anyone has the firmware update disks/images that would also be very
helpful, than i could take a peek at the Firmware.

Thanks!
Sven
Re: Spring Cleaning----HP Microwave Seminar... Scan and Post

 

approx 800 pages
Sorry, PM to Santiago regarding CLIP

 

Santiago, I'm in roaming and have some problems with emails. Please send again
Milan Vasic
Re: HP 8640b range switch

 

I have a bunch of these (I think..) slide switches in my stash from a dismantled pulse generator. If you can send me a picture of the dead one, I can check what I have in stock.

Wilko
Re: HP 8640b range switch

 

Thanks Adam.
So a slider again. It should be possible to find them from more dead HP devices.
But difficult now to find cheap ones even "dead".
Renaud
?
Re: Switched attenuator issue

 

You may have fixed your problem in the short term, but I wonder about the long term effect on the N-Butyl rubber rings. They tend to last 10-15 years or more in normal lab environments. Did you inspect the contact pad on the attenuator sections, you might need a microscope (10x?), (particularly on the 10dB pad -smallest pad, near the input). I have seen divots on the pads, dimples on contacts where slight overpowering had caused contact welds transferring material from pad to contact, and anomalies in reading repeatability. I solved this issue with alcohol wetted paper pulled between the contact and pad, a mild abrasive. Then loosening the atten pad, repositioning it slightly so the contact hits a new place on the pad. This cured my issues.

Don Bitters
Re: HP 8640b range switch

 

The switch i removed the contacts from was the 8640B slide switch used on the AM/FM modulation slider.? There are some other instruments that use this same contact as well, but do not have the details.? There was a thread about it a few years ago.
Spring Cleaning----HP Microwave Seminar... Scan and Post

 

Found these in the process of Spring cleaning.?
?
I have all the handouts.? If someone is interested in scanning and posting that would be great.?
If they already exist on the net, please let me know and I will toss...?
?
Otherwise, free to whomever, just pay media shipping.?
?
Re: 3" disks for 8566A/B, 8568A/B on HP 9000 Series 200 Computers - Any interest in images?

 

Hello,

You can use the LIF Utils. Latest release 2.0 was in Dec 2024 and it was
tested on Win10 and Win11.



Please read the changes for the 2.0 release.

73,
Razvan

On 12/03/2025 17:35, Ulf Kylenfall via groups.io wrote:
Hello Forum,
I think I posted this before but no harm in bumping...
Together with an HP8568B, I got a number of 3?-inch disks:
85863-10027 Rev C : 85863A Opt 630 Basic Software Library
08568-10004 Rev A: HP 8568B Spectrum Analyzer Operation Verification
08568-10004 Rev A: BASIC Operation Verification for 8568B
85863-10027 Rev B: 85863A Basic Software Library for 8566A and 8568A Opt
630.
All disks (C) 1984 and two of them marked "For HP 9000 Series 200
Computers with Basic 2.0 or 3.0 O/S
Any interest in images? I do not know if any data remains on them.
If so, How to read and make images on a PC running XP or W7?
Cheers
Ulf Kylenfall
SM6GXV
Re: Switched attenuator issue

 

Thanks for the notes on this.? I have had a number of issues with the switched attenuators, particularly in HP8753D, E, and ES units.? In my experience they're bad on about 20-30% of the units which I have come across.? They use the 33321Q.? I have had luck with these just opening them up and cleaning the contacts with alcohol, but I like your Deoxit Gold idea as a protection once they're cleaned up.
Re: HP 8640b range switch

 

Adam, I believe that contacts from the slide switches of HP8012B and 8013B would do too but that should be verified. What are the reference of those you found please?
Renaud
Re: 3" disks for 8566A/B, 8568A/B on HP 9000 Series 200 Computers - Any interest in images?

 

On Wed, Mar 12, 2025 at 5:35?PM Ulf Kylenfall via groups.io
<ulf_r_k@...> wrote:


Hello Forum,

I think I posted this before but no harm in bumping...
Together with an HP8568B, I got a number of 3?-inch disks:

85863-10027 Rev C : 85863A Opt 630 Basic Software Library
08568-10004 Rev A: HP 8568B Spectrum Analyzer Operation Verification
08568-10004 Rev A: BASIC Operation Verification for 8568B
85863-10027 Rev B: 85863A Basic Software Library for 8566A and 8568A Opt 630.

All disks (C) 1984 and two of them marked "For HP 9000 Series 200 Computers with Basic 2.0 or 3.0 O/S

Any interest in images? I do not know if any data remains on them.
If so, How to read and make images on a PC running XP or W7?
I'd recommend a greaseweazle board. It's an USB tool that can directly
control a PC floppy disk drive and get a flux-level image of (almost)
any disk.

HTH
Frank IZ8DWF
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