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  1. HP-Agilent-Keysight-Equipment
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Date
Re: Wanted: HP 10509A Loop Antenna, part of HP 117A VLF Comparator

 

Just curious, what are you going to do with the requested antenna?? ?I was under the impression that the phase modulation method of WWV changed a few years ago, making the HP117A VLF Comparator comparatively useless (mind the pun!).? ? Is there a way this instrument can still function?

? Dan


On Monday, April 15, 2019, 12:20:21 AM EDT, wd73383 via Groups.Io <wd73383@...> wrote:


Wanted: HP 10509A Loop Antenna in good physical condition, don't care if preamplifier is serviceable.

Contact me directly at whitreeve@... with details.

Whit

Re: Keypad for 70820A module

 

Thanks Dave,
Yes I am aware that you don't need the keyboard to control things with out but it seems easier to do.
And I like to find all the bits is possible.

I will try out the keyboard that I have. There are so few details on the.
Thanks everyone for the answers

Dave
VE7HR
Surrey BC


On Tue, Apr 16, 2019 at 10:35 AM Dave McGuire <mcguire@...> wrote:
On 4/16/19 1:31 PM, Ed Breya via Groups.Io wrote:
> I have the same rig, more or less - it didn't have the keypad. I think
> you can do without it and control everything from the screen menus,
> while the keypad allows for shortcuts to the basic functions, or to
> operate it with various programs - or maybe not. Anyway, as I recall, I
> could run it just fine.

? This is correct; you don't need the module-specific keypad to do
anything on any 70K series instrument.

? I have a bunch of 70K stuff running from one display, and I just have
the blank keypad.? Works fine.

> I think the keypads for the various uses are all the same inside, with
> the difference being the button labels. I later acquired a keypad for a
> different type unit, but have not tried it to see what happens. I think
> you could probably use the one you have, and just figure out what the
> button functions should be.

? Some of the keypad inserts use double-width buttons I think, but all
they are are plungers that press the key mechanisms underneath.

? ? ? ? ? ? ? ? ?-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA





--
72 de Dave
VE7HR
Re: Keypad for 70820A module

 

On 4/16/19 1:31 PM, Ed Breya via Groups.Io wrote:
I have the same rig, more or less - it didn't have the keypad. I think
you can do without it and control everything from the screen menus,
while the keypad allows for shortcuts to the basic functions, or to
operate it with various programs - or maybe not. Anyway, as I recall, I
could run it just fine.
This is correct; you don't need the module-specific keypad to do
anything on any 70K series instrument.

I have a bunch of 70K stuff running from one display, and I just have
the blank keypad. Works fine.

I think the keypads for the various uses are all the same inside, with
the difference being the button labels. I later acquired a keypad for a
different type unit, but have not tried it to see what happens. I think
you could probably use the one you have, and just figure out what the
button functions should be.
Some of the keypad inserts use double-width buttons I think, but all
they are are plungers that press the key mechanisms underneath.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Keypad for 70820A module

 

I have the same rig, more or less - it didn't have the keypad. I think you can do without it and control everything from the screen menus, while the keypad allows for shortcuts to the basic functions, or to operate it with various programs - or maybe not. Anyway, as I recall, I could run it just fine.

I think the keypads for the various uses are all the same inside, with the difference being the button labels. I later acquired a keypad for a different type unit, but have not tried it to see what happens. I think you could probably use the one you have, and just figure out what the button functions should be.

Unless you're going to need its full 40-50 GHz capability, it's best to just adapt the inputs to SMA-compatible types. I bought some short (12") cable type adapters, which were much cheaper than the ideal, simple straight-through barrel types. I made a little box that mounts onto the input connectors, with the cables inside, and SMAs on the right side, to make it less obtrusive in the front.

Ed
Re: E4401B No 50MHZ Cal signal

 

Also came across a reference to a CD-ROM with documentation. Anyone know about this and if it might be useful?

Agilent Technologies ESA Spectrum Analyzers Documentation
CD-ROM Part Number: E4401-90427?????????
?Date: August 2002

Info came from this PDF document which contains links but the corresponding files seem to have been removed from the site.
http://doc.xdevs.com/doc/HP_Agilent_Keysight/HP%20ESA%20E4400%20Series%20Documentation/ESA%20%28D%29/MAINMENU.PDF
Re: Keypad for 70820A module

 

¿ªÔÆÌåÓý


You can use a number of other sig gens with the 70820 by putting their command string in the custom entry option.?

Bob

On Apr 16, 2019, at 08:39, Dave Miller <ve7hr@...> wrote:

Hi Paul,
Where do I find this users group?

Mine has the adapters. ?:-)

I have a a few pieces of the MMS system that I use on a regular basic. And almost enough for another basic low frequency setup. ?:-). ?

As for signal generators I have a 8672A which happens to be on the list. ?

So life is good. ?

Thanks for the information Paul?

Dave



On Apr 16, 2019, at 12:56 AM, Paul Bicknell <paul@...> wrote:

Hi Dave

?

Welcome aboard to the HP 70000? users? ??there is a 70000 user group

Firstly you will require 2 adapters as the input connectors are 2.4 and are not comparable with

Possibly your standard connectors ( noting? SMA / 3.4 / 2.9 MM connectors are all interchangeable )

?

I also have a 70820? and I am currently looking for a mating RF signal generator to work with it

A list of the mating sig generators are in one of the menus on the 70820

?

Best of luck Paul

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 16 April 2019 05:01
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Keypad for 70820A module

?

If anyone has a keypad that goes with a HP 70820A module I am interested in obtaining one. ?Picked up a 70004A mainframe with a 70820A module but the keypad is for another module. ?
Mute good news as the module passes self test. ?Now I just have to figure out how to use the microwave transition analyzer does but it look interesting. ?
Thanks?
Dave VE7HR?

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.
Re: E4401B No 50MHZ Cal signal

 

John,

Thanks for the info and with the part number I was able to get the service guide PDF. I also found a section at the KO4BB website with lots of E4401B manuals, which I am sure most of you already know about, but just in case here is the direct link:



The trick was definitively to search for E4401B instead of E4411B and/or the specific manual part number.
Re: Keypad for 70820A module

 

¿ªÔÆÌåÓý

Hi Paul,
Where do I find this users group?

Mine has the adapters. ?:-)

I have a a few pieces of the MMS system that I use on a regular basic. And almost enough for another basic low frequency setup. ?:-). ?

As for signal generators I have a 8672A which happens to be on the list. ?

So life is good. ?

Thanks for the information Paul?

Dave



On Apr 16, 2019, at 12:56 AM, Paul Bicknell <paul@...> wrote:

Hi Dave

?

Welcome aboard to the HP 70000? users? ??there is a 70000 user group

Firstly you will require 2 adapters as the input connectors are 2.4 and are not comparable with

Possibly your standard connectors ( noting? SMA / 3.4 / 2.9 MM connectors are all interchangeable )

?

I also have a 70820? and I am currently looking for a mating RF signal generator to work with it

A list of the mating sig generators are in one of the menus on the 70820

?

Best of luck Paul

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 16 April 2019 05:01
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Keypad for 70820A module

?

If anyone has a keypad that goes with a HP 70820A module I am interested in obtaining one. ?Picked up a 70004A mainframe with a 70820A module but the keypad is for another module. ?
Mute good news as the module passes self test. ?Now I just have to figure out how to use the microwave transition analyzer does but it look interesting. ?
Thanks?
Dave VE7HR?

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.
Re: Keypad for 70820A module

 

¿ªÔÆÌåÓý

Hi Dave

?

Welcome aboard to the HP 70000? users? ??there is a 70000 user group

Firstly you will require 2 adapters as the input connectors are 2.4 and are not comparable with

Possibly your standard connectors ( noting? SMA / 3.4 / 2.9 MM connectors are all interchangeable )

?

I also have a 70820? and I am currently looking for a mating RF signal generator to work with it

A list of the mating sig generators are in one of the menus on the 70820

?

Best of luck Paul

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 16 April 2019 05:01
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Keypad for 70820A module

?

If anyone has a keypad that goes with a HP 70820A module I am interested in obtaining one. ?Picked up a 70004A mainframe with a 70820A module but the keypad is for another module. ?
Mute good news as the module passes self test. ?Now I just have to figure out how to use the microwave transition analyzer does but it look interesting. ?
Thanks?
Dave VE7HR?

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.
Keypad for 70820A module

 

If anyone has a keypad that goes with a HP 70820A module I am interested in obtaining one. ?Picked up a 70004A mainframe with a 70820A module but the keypad is for another module. ?
Mute good news as the module passes self test. ?Now I just have to figure out how to use the microwave transition analyzer does but it look interesting. ?
Thanks?
Dave VE7HR?
Re: hp3586a selective voltmeter jammed

 

Yes. It was frozen just the same. The unit was in storage for some time and when I tried to use it the display was frozen. On the microprocessor board there is a battery for RAM back-up. When the battery failed, I guess the processor did not know what values to use at boot-up.

I also have a Yamaha HS-8 digital organ which also had a frozen display at power-on. It was a bad battery backed-up RAM chip which failed. I replaced the RAM chip and the organ was OK.

You might wish to check any battery back-up circuit and battery backed-up RAM on the processor board.


On 2019-Apr-15 5:33 PM, cc@... wrote:
Hi Merchison, thank?you for sharing your experience. Unfortunately the HP3586A does not have a front-panel battery but a NiCd one on the power supply board for which I had to clean in the vinegar the same power supply board and the micro controller board to remove the residues of the leakage. My understanding is that the presence of that battery is not strictly necessary for the normal operation of the hp3586 and indeed, after cleaning, I also removed it temporarily. Just a curiosity: was it perfectly the same frozen display?

On Mon, Apr 15, 2019 at 06:00 PM, Merchison Burke wrote:

HP8165A


---
This email has been checked for viruses by AVG.
Re: 8753ES LCD update

 

I took them and they will be forthcoming!

On 4/15/2019 10:20 PM, W2HX wrote:
what?! no before and after pictures?!
________________________________________
From: [email protected] <[email protected]> on behalf of Peter Gottlieb <hpnpilot@...>
Sent: Monday, April 15, 2019 9:46 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 8753ES LCD update

After I got my 8753ES working I was a little disappointed in the LCD brightness,
especially right when you turn it on. I also didn't think the viewing angle was
great; a little off to the side and it really dropped off. The main problem
seemed to be that the CCFL backlight was old and needed replacement. The panel
is a Sharp LQ084V1DG22 but unfortunately I couldn't find an online source for a
replacement bulb, which is a special L shaped one to light two sides of the
display. I did find a LED retrofit on ebay:



But yikes, $93 plus $11 shipping? That's $104, for a backlight? That just
seemed wrong to me. So I did some further research and found that while the
LQ084V1DG22 is no longer manufactured, there is a somewhat compatible new
version made, a LQ084V1DG43. The actual display has the same dimensions and
mounting alignment features and is not as thick. It has a LED backlight and
improved viewing angle! And it is $100 shipped! That's $4 cheaper than the
replacement backlight! Here it is:



So I ordered it and also went online to get the data sheet. There is one
incompatibility from the original: the LED backlight takes 12 volts and uses
this really tiny JST connector. Well, the backlight inverter in the instrument
runs on 5 volts and there isn't 12 volts available.

First problem was that JST connector. They are really inexpensive but good luck
getting them. Digikey had the shells but no crimp pins. Mouser had neither in
stock. Some other places had them but large minimum orders. I went to the JST
site and found a page where you could order samples! Sure enough they arrives
several days later.

When I said tiny I meant it; these things require assembly under a microscope.
28 AWG wire is almost too big, certainly too big to crimp the terminal around
the insulation and still have it go in the housing. I cut off those crimp ears
and just crimped around the bare wire then soldered. Count on using the
smallest tip and the solder which you use for doing rework on 25 mil pitch
surface mount boards. It took me several to get it right.

There are brightness and enable inputs for the backlight. Both default to on
and full brightness if not connected so you only need 12 volts.

I tested and yes it lights up. I then plugged it into the instrument (without
installing mechanically) and it worked!

I then took the old display out. It has some thick black gasket around the
active area which was too crumbly to reuse. As the new LCD is thinner, and held
to the front panel by a piece of sheetmetal, I had to use foam rubber tape to
make up the extra thickness and keep the new LCD from moving around. I am not
sure I like that I can see the unpainted frame of the new LCD so I may try and
neatly put black tape around it where it's visible, mainly on the top.

For now I just used a bench supply to do the final test of how it looks. I will
deal with the 12 volts tomorrow, probably a new 7812 off of the raw +18 or
something (it needs about 250 mA).

Wow! The brightness is dramatically different! It's fantastic now, and the
viewing angle is tremendously improved. If you're up for dealing with the tiny
connector and the 12 volts this new LCD makes a dramatic difference.
Additionally, the LED backlight had a long enough life that I will never have to
worry about it again.

Peter
Re: 8753ES LCD update

 

I'll do before and after pix on mine?


On Mon, Apr 15, 2019, 7:22 PM W2HX <w2hx@...> wrote:
what?! no before and after pictures?!
________________________________________
From: [email protected] <[email protected]> on behalf of Peter Gottlieb <hpnpilot@...>
Sent: Monday, April 15, 2019 9:46 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 8753ES LCD update

After I got my 8753ES working I was a little disappointed in the LCD brightness,
especially right when you turn it on.? I also didn't think the viewing angle was
great; a little off to the side and it really dropped off.? The main problem
seemed to be that the CCFL backlight was old and needed replacement.? The panel
is a Sharp LQ084V1DG22 but unfortunately I couldn't find an online source for a
replacement bulb, which is a special L shaped one to light two sides of the
display.? I did find a LED retrofit on ebay:



But yikes, $93 plus $11 shipping?? That's $104, for a backlight? That just
seemed wrong to me.? So I did some further research and found that while the
LQ084V1DG22 is no longer manufactured, there is a somewhat compatible new
version made, a LQ084V1DG43.? The actual display has the same dimensions and
mounting alignment features and is not as thick.? It has a LED backlight and
improved viewing angle!? And it is $100 shipped!? That's $4 cheaper than the
replacement backlight!? Here it is:



So I ordered it and also went online to get the data sheet.? There is one
incompatibility from the original:? the LED backlight takes 12 volts and uses
this really tiny JST connector.? Well, the backlight inverter in the instrument
runs on 5 volts and there isn't 12 volts available.

First problem was that JST connector.? They are really inexpensive but good luck
getting them.? Digikey had the shells but no crimp pins.? Mouser had neither in
stock.? Some other places had them but large minimum orders.? I went to the JST
site and found a page where you could order samples!? Sure enough they arrives
several days later.

When I said tiny I meant it; these things require assembly under a microscope.
28 AWG wire is almost too big, certainly too big to crimp the terminal around
the insulation and still have it go in the housing.? I cut off those crimp ears
and just crimped around the bare wire then soldered.? Count on using the
smallest tip and the solder which you use for doing rework on 25 mil pitch
surface mount boards.? It took me several to get it right.

There are brightness and enable inputs for the backlight.? Both default to on
and full brightness if not connected so you only need 12 volts.

I tested and yes it lights up.? I then plugged it into the instrument (without
installing mechanically) and it worked!

I then took the old display out.? It has some thick black gasket around the
active area which was too crumbly to reuse.? As the new LCD is thinner, and held
to the front panel by a piece of sheetmetal, I had to use foam rubber tape to
make up the extra thickness and keep the new LCD from moving around.? I am not
sure I like that I can see the unpainted frame of the new LCD so I may try and
neatly put black tape around it where it's visible, mainly on the top.

For now I just used a bench supply to do the final test of how it looks.? I will
deal with the 12 volts tomorrow, probably a new 7812 off of the raw +18 or
something (it needs about 250 mA).

Wow!? The brightness is dramatically different!? It's fantastic now, and the
viewing angle is tremendously improved.? If you're up for dealing with the tiny
connector and the 12 volts this new LCD makes a dramatic difference.
Additionally, the LED backlight had a long enough life that I will never have to
worry about it again.

Peter
Re: 8753ES LCD update

 

what?! no before and after pictures?!
________________________________________
From: [email protected] <[email protected]> on behalf of Peter Gottlieb <hpnpilot@...>
Sent: Monday, April 15, 2019 9:46 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 8753ES LCD update

After I got my 8753ES working I was a little disappointed in the LCD brightness,
especially right when you turn it on. I also didn't think the viewing angle was
great; a little off to the side and it really dropped off. The main problem
seemed to be that the CCFL backlight was old and needed replacement. The panel
is a Sharp LQ084V1DG22 but unfortunately I couldn't find an online source for a
replacement bulb, which is a special L shaped one to light two sides of the
display. I did find a LED retrofit on ebay:



But yikes, $93 plus $11 shipping? That's $104, for a backlight? That just
seemed wrong to me. So I did some further research and found that while the
LQ084V1DG22 is no longer manufactured, there is a somewhat compatible new
version made, a LQ084V1DG43. The actual display has the same dimensions and
mounting alignment features and is not as thick. It has a LED backlight and
improved viewing angle! And it is $100 shipped! That's $4 cheaper than the
replacement backlight! Here it is:



So I ordered it and also went online to get the data sheet. There is one
incompatibility from the original: the LED backlight takes 12 volts and uses
this really tiny JST connector. Well, the backlight inverter in the instrument
runs on 5 volts and there isn't 12 volts available.

First problem was that JST connector. They are really inexpensive but good luck
getting them. Digikey had the shells but no crimp pins. Mouser had neither in
stock. Some other places had them but large minimum orders. I went to the JST
site and found a page where you could order samples! Sure enough they arrives
several days later.

When I said tiny I meant it; these things require assembly under a microscope.
28 AWG wire is almost too big, certainly too big to crimp the terminal around
the insulation and still have it go in the housing. I cut off those crimp ears
and just crimped around the bare wire then soldered. Count on using the
smallest tip and the solder which you use for doing rework on 25 mil pitch
surface mount boards. It took me several to get it right.

There are brightness and enable inputs for the backlight. Both default to on
and full brightness if not connected so you only need 12 volts.

I tested and yes it lights up. I then plugged it into the instrument (without
installing mechanically) and it worked!

I then took the old display out. It has some thick black gasket around the
active area which was too crumbly to reuse. As the new LCD is thinner, and held
to the front panel by a piece of sheetmetal, I had to use foam rubber tape to
make up the extra thickness and keep the new LCD from moving around. I am not
sure I like that I can see the unpainted frame of the new LCD so I may try and
neatly put black tape around it where it's visible, mainly on the top.

For now I just used a bench supply to do the final test of how it looks. I will
deal with the 12 volts tomorrow, probably a new 7812 off of the raw +18 or
something (it needs about 250 mA).

Wow! The brightness is dramatically different! It's fantastic now, and the
viewing angle is tremendously improved. If you're up for dealing with the tiny
connector and the 12 volts this new LCD makes a dramatic difference.
Additionally, the LED backlight had a long enough life that I will never have to
worry about it again.

Peter
Re: 8753ES LCD update

 

On 4/15/19 8:46 PM, Peter Gottlieb wrote:
Both default to on and full brightness if not connected so you only need 12 volts.
Yeah, I found this with a TV LED back light recently. It's a nice feature. Allows them to be redeployed
as light panels for photography, or as 92%+ efficient room lights if you can fit them in a fixture that passes muster
with today's design standards.
Re: 8753ES LCD update

 

Ordered! Thanks!


On Mon, Apr 15, 2019, 6:46 PM Peter Gottlieb <hpnpilot@...> wrote:
After I got my 8753ES working I was a little disappointed in the LCD brightness,
especially right when you turn it on.? I also didn't think the viewing angle was
great; a little off to the side and it really dropped off.? The main problem
seemed to be that the CCFL backlight was old and needed replacement.? The panel
is a Sharp LQ084V1DG22 but unfortunately I couldn't find an online source for a
replacement bulb, which is a special L shaped one to light two sides of the
display.? I did find a LED retrofit on ebay:



But yikes, $93 plus $11 shipping?? That's $104, for a backlight? That just
seemed wrong to me.? So I did some further research and found that while the
LQ084V1DG22 is no longer manufactured, there is a somewhat compatible new
version made, a LQ084V1DG43.? The actual display has the same dimensions and
mounting alignment features and is not as thick.? It has a LED backlight and
improved viewing angle!? And it is $100 shipped!? That's $4 cheaper than the
replacement backlight!? Here it is:



So I ordered it and also went online to get the data sheet.? There is one
incompatibility from the original:? the LED backlight takes 12 volts and uses
this really tiny JST connector.? Well, the backlight inverter in the instrument
runs on 5 volts and there isn't 12 volts available.

First problem was that JST connector.? They are really inexpensive but good luck
getting them.? Digikey had the shells but no crimp pins.? Mouser had neither in
stock.? Some other places had them but large minimum orders.? I went to the JST
site and found a page where you could order samples!? Sure enough they arrives
several days later.

When I said tiny I meant it; these things require assembly under a microscope.?
28 AWG wire is almost too big, certainly too big to crimp the terminal around
the insulation and still have it go in the housing.? I cut off those crimp ears
and just crimped around the bare wire then soldered.? Count on using the
smallest tip and the solder which you use for doing rework on 25 mil pitch
surface mount boards.? It took me several to get it right.

There are brightness and enable inputs for the backlight.? Both default to on
and full brightness if not connected so you only need 12 volts.

I tested and yes it lights up.? I then plugged it into the instrument (without
installing mechanically) and it worked!

I then took the old display out.? It has some thick black gasket around the
active area which was too crumbly to reuse.? As the new LCD is thinner, and held
to the front panel by a piece of sheetmetal, I had to use foam rubber tape to
make up the extra thickness and keep the new LCD from moving around.? I am not
sure I like that I can see the unpainted frame of the new LCD so I may try and
neatly put black tape around it where it's visible, mainly on the top.

For now I just used a bench supply to do the final test of how it looks.? I will
deal with the 12 volts tomorrow, probably a new 7812 off of the raw +18 or
something (it needs about 250 mA).

Wow!? The brightness is dramatically different!? It's fantastic now, and the
viewing angle is tremendously improved.? If you're up for dealing with the tiny
connector and the 12 volts this new LCD makes a dramatic difference.?
Additionally, the LED backlight had a long enough life that I will never have to
worry about it again.

Peter
8753ES LCD update

 

After I got my 8753ES working I was a little disappointed in the LCD brightness, especially right when you turn it on.? I also didn't think the viewing angle was great; a little off to the side and it really dropped off.? The main problem seemed to be that the CCFL backlight was old and needed replacement.? The panel is a Sharp LQ084V1DG22 but unfortunately I couldn't find an online source for a replacement bulb, which is a special L shaped one to light two sides of the display.? I did find a LED retrofit on ebay:



But yikes, $93 plus $11 shipping?? That's $104, for a backlight? That just seemed wrong to me.? So I did some further research and found that while the LQ084V1DG22 is no longer manufactured, there is a somewhat compatible new version made, a LQ084V1DG43.? The actual display has the same dimensions and mounting alignment features and is not as thick.? It has a LED backlight and improved viewing angle!? And it is $100 shipped!? That's $4 cheaper than the replacement backlight!? Here it is:



So I ordered it and also went online to get the data sheet.? There is one incompatibility from the original:? the LED backlight takes 12 volts and uses this really tiny JST connector.? Well, the backlight inverter in the instrument runs on 5 volts and there isn't 12 volts available.

First problem was that JST connector.? They are really inexpensive but good luck getting them.? Digikey had the shells but no crimp pins.? Mouser had neither in stock.? Some other places had them but large minimum orders.? I went to the JST site and found a page where you could order samples!? Sure enough they arrives several days later.

When I said tiny I meant it; these things require assembly under a microscope.? 28 AWG wire is almost too big, certainly too big to crimp the terminal around the insulation and still have it go in the housing.? I cut off those crimp ears and just crimped around the bare wire then soldered.? Count on using the smallest tip and the solder which you use for doing rework on 25 mil pitch surface mount boards.? It took me several to get it right.

There are brightness and enable inputs for the backlight.? Both default to on and full brightness if not connected so you only need 12 volts.

I tested and yes it lights up.? I then plugged it into the instrument (without installing mechanically) and it worked!

I then took the old display out.? It has some thick black gasket around the active area which was too crumbly to reuse.? As the new LCD is thinner, and held to the front panel by a piece of sheetmetal, I had to use foam rubber tape to make up the extra thickness and keep the new LCD from moving around.? I am not sure I like that I can see the unpainted frame of the new LCD so I may try and neatly put black tape around it where it's visible, mainly on the top.

For now I just used a bench supply to do the final test of how it looks.? I will deal with the 12 volts tomorrow, probably a new 7812 off of the raw +18 or something (it needs about 250 mA).

Wow!? The brightness is dramatically different!? It's fantastic now, and the viewing angle is tremendously improved.? If you're up for dealing with the tiny connector and the 12 volts this new LCD makes a dramatic difference.? Additionally, the LED backlight had a long enough life that I will never have to worry about it again.

Peter
Re: hp3586a selective voltmeter jammed

 

...forgot to write that I checked again the voltages and their ripples and everything is good. I am trying around cables and connectors and inspecting the solder joint for the two connectors which bring bus cables to the A98 front-panel board.?
I am scared that the fault could be on the microcontroller board A60 because it will be really hard to find. I still hope in something about connectors, cables and A98 display-panel.

Finally I found a good not-blurred schematics here?

Thank you Ciro
Re: hp3586a selective voltmeter jammed

 

Hi?Merchison, thank?you for sharing your experience. Unfortunately the HP3586A does not have a front-panel battery but a NiCd one on the power supply board for which I had to clean in the vinegar the same power supply board and the micro controller board to remove the residues of the leakage. My understanding is that the presence of that battery is not strictly necessary for the normal operation of the hp3586 and indeed, after cleaning, I also removed it temporarily. Just a curiosity: was it perfectly the same frozen display?


On Mon, Apr 15, 2019 at 06:00 PM, Merchison Burke wrote:
HP8165A
Re: Type of coax for Impedance Analyzer Test Fixtures

 

Thanks Ed, Brooke, and Don;
One of the problems I am faced with is that I am trying to adapt newer fixtures to an older 4192A Impedance Analyzer and the Open/Short Zero is for spot frequencies only.
Additionally my dielectric fixture is home-made and will not have the precision of the HP unit. It should be good to a few percent which I will be happy with.
The top electrode will have a guard and mount under the phenolic plate. Springs push this plate against the micrometer which is used to set the gap. The lower electrode will be held down by the spring in the photo, and pushed up by the three pointed nylon spacers set in dimples. The spacers can be adjusted to set the tilt of the lower electrode to match the top electrode, and to set the zero gap. The concept is simple but the implementation is not.?
The sliders and rods are from an old dot matrix printer.?
DSC_9135.JPG

On Mon, Apr 15, 2019 at 3:59 PM Don Bitters via Groups.Io <donbitters=[email protected]> wrote:
The calibration of the 4285A calls for the 42100A precision resistor set, the 16380A, 16380C precision capacitor standards - cal¡¯d to 30MHz or more, possibly the 16074A resistor set, inductor standards, and multiple fixtures.? There are 20 service guides, operating manuals, service manuals, user guides, and software revisions available on the Keysight 4285A web page available for download.? There is also an excellent primer on LCR, impedance measurements.

Don Bitters
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