Re: 8558B centre frequency wildly unstable above 1250MHz
ferrymanr wrote:
Found that a new Bourns 10 turn pot is rather expensive so took the risk
of injecting a little jungle juice into it. Now the 8558B is back to
normal. I love simple faults.
Dick G4BBH Me too! I recently "repaired" a Tek 7B53A and a Fluke 8600A with about $0.10 worth of contact cleaner generously applied to the switches. Both units were EBay "Parts - not working" specials. The Tek unit appeared really dead. After using the contact cleaner, it showed some life, but still not useful (occasional random sweeps). I left the unit powered in in my mainframe and after a few hours looked over and it was working perfectly. Hasn't missed a sweep since! Best regards, -- Bob Smither, PhD Circuit Concepts, Inc. ========================================================================= "The beauty of the second amendment is that it will not be needed until they try to take it." --Thomas Jefferson ========================================================================= Smither@... 281-331-2744(office) -4616(fax)
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Hello,
I have an HP3468A that appears to have a bad control ROM. The unit just
cycles between power up (lights up all elements on the display and a
brief display of:
OV.LD C:3111
and repeat. The processor is being reset through U504 / U550B pin 7.
All the power supplies look stable and clean.
After doing what analog checks I could and finding nothing, I did the
Signature Analysis tests in the Service Manual. The Free Running SA -
SA0 signatures are correct. The signatures in the General Signature
Analysis - SA1, are incorrect which points to the control ROM, U502.
U502 is a Mostek MK36752P. HP part number is 1818-1753. The pin out
looks like that of a Motorola MCM68764 UV erasable PROM, which I can get
on EBay.
Would anyone on the list know where I could get a file with the contents
of that PROM (or even better, an HP part 1818-1753)?
Many thanks!
--
Bob Smither, PhD Circuit Concepts, Inc.
=========================================================================
If a person has integrity, nothing else matters.
If a person doesn't have integrity, nothing else matters.
=========================================================================
Smither@... 281-331-2744(office) -4616(fax)
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Re: 8558B centre frequency wildly unstable above 1250MHz
I have a customised nozzle for my aerosol can of contact fluid. I still have the supplied 10cm length of tube but have fitted a hypodermic needle to the end. This allows me to get a little fluid into awkward places without spraying everything else. A careful inspection of the 10 turn potentiometer with a watchmakers lens showed that there is a tiny gap to the side of ech end connnection. I squirted it in there. The Bourns potentiometer fitted and many others have the rear cover held on with metal clips but I did not want to release these in case the whole thing came apart. That little dribble that got in did the trick.
Dick
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--- In hp_agilent_equipment@..., "tcxo" <tcxoe@...> wrote:
Congratulations Dick!
It might be helpful to the rest of us to know the details of how you injected the cleaner. Did you drill a hole into the case? Or???
Cheers!
Greg
----- Original Message -----
From: ferrymanr
To: hp_agilent_equipment@...
Sent: Monday, August 29, 2011 4:23 AM
Subject: [hp_agilent_equipment] Re: 8558B centre frequency wildly unstable above 1250MHz
Found that a new Bourns 10 turn pot is rather expensive so took the risk of injecting a little jungle juice into it. Now the 8558B is back to normal. I love simple faults.
Dick G4BBH
--- In hp_agilent_equipment@..., "tcxo" <tcxoe@> wrote:
Noisy / Intermittent / Bad tuning potentiometer?
-Greg
----- Original Message -----
From: ferrymanr
To: hp_agilent_equipment@...
Sent: Sunday, August 28, 2011 4:26 PM
Subject: [hp_agilent_equipment] 8558B centre frequency wildly unstable above 1250MHz
I have an 8558B which becomes totally unstable if the centre frequency is set above about 1250MHz at any span setting. If the span is sufficiently wide it is clear that the SA it is covering perfectly up to about 1550MHz or 1600MHz with some loss of sensitivitity at the top end. When the centre frequency is set above about 1250MHz the frequency display becomes random from blank up to some random number. This indicates to me that the control voltage is unstable above that frequency setting. The display looks like it is jumping all over the spectrum (have I discovered 'spread spectrum').
Any suggestions as to a likely cause or common problem before I delve into the murky depths.
Thanks
Dick G4BBH
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
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Re: Question about Service Manual Copyrights
Most units did not come with complete service manuals. They had to be purchased separately. I believe HP has made all their old manuals public domain. Actually I believe they have been requesting any old manuals be uploaded to their site as a service to the users of the older equipment. That is why some are not of good quality. Some are even military versions of the manuals.
Artek Media has some of the best copies available. Most if not all of what he has he copied himself to a higher standard than most of the rest of us can. He charges a very modest amount for his time. I am only a satisfied customer. No connection to his operation. He is also a member of this group and may chime in with more exact information on what you asked. The link to his site is below:
Steve, KJ5RV
br4av01 wrote:
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A simple question to anyone who may know: what are the legalities of copying HP service manuals? Some of them seem to be in the public domain, since they are offered on the HP information web site. But some of these electronic manuals are very low resolution, and practically unusable for repair purposes. Did each piece of test gear come with a service manual or did they have to be purchased separately? Just curious, since the market for used service manuals commands a premium for the printed materials.
Thanks,
br4
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Re: Question about Service Manual Copyrights
Agilent controls all copying and distribution of their manuals. They
will license you if you contact them through the proper channels with
certain stipulations as to what you can and can not distribute copies
of. Just because they offer it for free download on their web site does
NOT mean it is in the public domain. Free sites like KO4BB.com and BAMA
have letters of agreement from Agilent to distribute copies of free
Agilent manuals. Agilent only allows non Agilent sources (such as
ourselves...Artekmedia) to distribute PDF manuals for products that are
officially no longer supported. They had a huge crackdown in about 1995
and have sporadically taken a few "unauthorized" sources to task since then
Cheers
Dave
President
Artekmedia
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On 8/29/2011 11:54 AM, br4av01 wrote:
A simple question to anyone who may know: what are the legalities of
copying HP service manuals? Some of them seem to be in the public
domain, since they are offered on the HP information web site. But
some of these electronic manuals are very low resolution, and
practically unusable for repair purposes. Did each piece of test gear
come with a service manual or did they have to be purchased
separately? Just curious, since the market for used service manuals
commands a premium for the printed materials.
Thanks,
br4
--
Dave& Lynn Henderson
Manuals@...
www.Artekmedia.com
PO Box 175
Welch,MN 55089
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Question about Service Manual Copyrights
A simple question to anyone who may know: what are the legalities of copying HP service manuals? Some of them seem to be in the public domain, since they are offered on the HP information web site. But some of these electronic manuals are very low resolution, and practically unusable for repair purposes. Did each piece of test gear come with a service manual or did they have to be purchased separately? Just curious, since the market for used service manuals commands a premium for the printed materials.
Thanks,
br4
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Re: Are plotters still useful?
I use a HP plotter to draw pcb layouts. I made an adapter from an old pen to hold a CD marker. It plots straight at the PCB and after plotting it is going in the stuff that solves the copper. I made a pcb for a 16 pin 2x2 mm AD power detector with this methode. Some pictures here :
Fred PA4TIM
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--- In hp_agilent_equipment@..., Jack Smith <Jack.Smith@...> wrote:
For instruments that use an HPIB plotter, a Prologix USB-HPIB adapter
and John Miles' 7470 program.
Once the plot is in your computer you can then print it on any printer
your computer works with, or save it as a GIF file, etc.
Jack
On 8/29/2011 10:51 AM, Peter Bunge wrote:
What do you use to record outputs from HP test equipment?
I have two plotters (7045B single & 7046B dual pen) but I simply use
my camera to photograph the screen. The thought of ink and paper is a
turn off, and pens are always a problem. Also these analog plotters
would not plot a scale; they must be carefully calibrated and the
units written in on graph paper.
I also have an HPIB plotter (7475A) that might work with some of my
gear like the 8566A spec analyzer or 8505A Network Analyzer, but what
about the 4815A Vector Impedance Meter?
Is there an interface to a modern printer?
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Re: Are plotters still useful?
So I looked up the 4815A and it does not have a screen. My reply below was only meant for instruments with a screen. Sorry
From: werner haussmann <w_haussmann@...>
To: "hp_agilent_equipment@..." <hp_agilent_equipment@...>
Sent: Monday, August 29, 2011 9:21 AM
Subject: Re: [hp_agilent_equipment] Are plotters still useful?
?
If the 4815A has the ability to dump the plotter sequence (HPGL) into a file you can create an image from that, or feed it to the Agilent Screen capture program to create the image for you.
?
Look for a command like "OUTPPLOT" or the like. Most instruments that write to a plotter can also be set up to write the HPGL data to a file on a PC.
Once you have that, you can 1. write a program to create an image, 2. use the Agilent Screen Capture 2.0 program to read the file and make an image, or 3. create an Add-in for the Screen Capture program that will get the data and show it as an image.
?
I know nothing of the 4815A, but most of the HP instruments that wrote to a plotter on GPIB, can also be queried or set up to dump the HPGL into a file.
?
So the first question; Does the 4815A have GPIB to plot the screen?
?
See here:
?
Werner
From: Peter Bunge <bunge@...>
To: hp_agilent_equipment@...
Sent: Monday, August 29, 2011 8:51 AM
Subject: [hp_agilent_equipment] Are plotters still useful?
?
What do you use to record outputs from HP test equipment?
I have two plotters (7045B single & 7046B dual pen) but I simply use my camera to photograph the screen. The thought of ink and paper is a turn off, and pens are always a problem. Also these analog plotters would not plot a scale; they must be carefully calibrated and the units written in on graph paper.
I also have an HPIB plotter (7475A) that might work with some of my gear like the 8566A spec analyzer or 8505A Network Analyzer, but what about the 4815A Vector Impedance Meter?
Is there an interface to a modern printer?
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
|
Re: Are plotters still useful?
If the 4815A has the ability to dump the plotter sequence (HPGL) into a file you can create an image from that, or feed it to the Agilent Screen capture program to create the image for you.
?
Look for a command like "OUTPPLOT" or the like. Most instruments that write to a plotter can also be set up to write the HPGL data to a file on a PC.
Once you have that, you can 1. write a program to create an image, 2. use the Agilent Screen Capture 2.0 program to read the file and make an image, or 3. create an Add-in for the Screen Capture program that will get the data and show it as an image.
?
I know nothing of the 4815A, but most of the HP instruments that wrote to a plotter on GPIB, can also be queried or set up to dump the HPGL into a file.
?
So the first question; Does the 4815A have GPIB to plot the screen?
?
See here:
?
Werner
From: Peter Bunge <bunge@...>
To: hp_agilent_equipment@...
Sent: Monday, August 29, 2011 8:51 AM
Subject: [hp_agilent_equipment] Are plotters still useful?
?
What do you use to record outputs from HP test equipment?
I have two plotters (7045B single & 7046B dual pen) but I simply use my camera to photograph the screen. The thought of ink and paper is a turn off, and pens are always a problem. Also these analog plotters would not plot a scale; they must be carefully calibrated and the units written in on graph paper.
I also have an HPIB plotter (7475A) that might work with some of my gear like the 8566A spec analyzer or 8505A Network Analyzer, but what about the 4815A Vector Impedance Meter?
Is there an interface to a modern printer?
|
Re: Are plotters still useful?
For instruments that use an HPIB plotter, a Prologix USB-HPIB adapter
and John Miles' 7470 program.
Once the plot is in your computer you can then print it on any printer
your computer works with, or save it as a GIF file, etc.
Jack
toggle quoted message
Show quoted text
On 8/29/2011 10:51 AM, Peter Bunge wrote:
What do you use to record outputs from HP test equipment?
I have two plotters (7045B single & 7046B dual pen) but I simply use
my camera to photograph the screen. The thought of ink and paper is a
turn off, and pens are always a problem. Also these analog plotters
would not plot a scale; they must be carefully calibrated and the
units written in on graph paper.
I also have an HPIB plotter (7475A) that might work with some of my
gear like the 8566A spec analyzer or 8505A Network Analyzer, but what
about the 4815A Vector Impedance Meter?
Is there an interface to a modern printer?
|
Re: 8558B centre frequency wildly unstable above 1250MHz
Congratulations Dick!
It might be helpful to the rest of us to know the details of how you injected the cleaner. Did you drill a hole into the case? Or???
Cheers!
Greg
toggle quoted message
Show quoted text
----- Original Message ----- From: ferrymanr To: hp_agilent_equipment@... Sent: Monday, August 29, 2011 4:23 AM Subject: [hp_agilent_equipment] Re: 8558B centre frequency wildly unstable above 1250MHz Found that a new Bourns 10 turn pot is rather expensive so took the risk of injecting a little jungle juice into it. Now the 8558B is back to normal. I love simple faults. Dick G4BBH --- In hp_agilent_equipment@..., "tcxo" <tcxoe@...> wrote:
Noisy / Intermittent / Bad tuning potentiometer?
-Greg
----- Original Message -----
From: ferrymanr
To: hp_agilent_equipment@...
Sent: Sunday, August 28, 2011 4:26 PM
Subject: [hp_agilent_equipment] 8558B centre frequency wildly unstable above 1250MHz
I have an 8558B which becomes totally unstable if the centre frequency is set above about 1250MHz at any span setting. If the span is sufficiently wide it is clear that the SA it is covering perfectly up to about 1550MHz or 1600MHz with some loss of sensitivitity at the top end. When the centre frequency is set above about 1250MHz the frequency display becomes random from blank up to some random number. This indicates to me that the control voltage is unstable above that frequency setting. The display looks like it is jumping all over the spectrum (have I discovered 'spread spectrum').
Any suggestions as to a likely cause or common problem before I delve into the murky depths.
Thanks
Dick G4BBH
|
Are plotters still useful?
What do you use to record outputs from HP test equipment?
I have two plotters (7045B single & 7046B dual pen) but I simply use my camera to photograph the screen. The thought of ink and paper is a turn off, and pens are always a problem. Also these analog plotters would not plot a scale; they must be carefully calibrated and the units written in on graph paper.
I also have an HPIB plotter (7475A) that might work with some of my gear like the 8566A spec analyzer or 8505A Network Analyzer, but what about the 4815A Vector Impedance Meter?
Is there an interface to a modern printer?
|
Re: 8558B centre frequency wildly unstable above 1250MHz
Found that a new Bourns 10 turn pot is rather expensive so took the risk of injecting a little jungle juice into it. Now the 8558B is back to normal. I love simple faults.
Dick G4BBH
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "tcxo" <tcxoe@...> wrote:
Noisy / Intermittent / Bad tuning potentiometer?
-Greg
----- Original Message -----
From: ferrymanr
To: hp_agilent_equipment@...
Sent: Sunday, August 28, 2011 4:26 PM
Subject: [hp_agilent_equipment] 8558B centre frequency wildly unstable above 1250MHz
I have an 8558B which becomes totally unstable if the centre frequency is set above about 1250MHz at any span setting. If the span is sufficiently wide it is clear that the SA it is covering perfectly up to about 1550MHz or 1600MHz with some loss of sensitivitity at the top end. When the centre frequency is set above about 1250MHz the frequency display becomes random from blank up to some random number. This indicates to me that the control voltage is unstable above that frequency setting. The display looks like it is jumping all over the spectrum (have I discovered 'spread spectrum').
Any suggestions as to a likely cause or common problem before I delve into the murky depths.
Thanks
Dick G4BBH
|
Re: 8558B centre frequency wildly unstable above 1250MHz
Bang on Greg. Slid the plug-in forward and measured the pot as it is very easy to access. Looks as if I will have to locate another. It looks like a standard Bourns 10 turn job but will consult the manual.
Dick G4BBH
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--- In hp_agilent_equipment@..., "tcxo" <tcxoe@...> wrote:
Noisy / Intermittent / Bad tuning potentiometer?
-Greg
----- Original Message -----
From: ferrymanr
To: hp_agilent_equipment@...
Sent: Sunday, August 28, 2011 4:26 PM
Subject: [hp_agilent_equipment] 8558B centre frequency wildly unstable above 1250MHz
I have an 8558B which becomes totally unstable if the centre frequency is set above about 1250MHz at any span setting. If the span is sufficiently wide it is clear that the SA it is covering perfectly up to about 1550MHz or 1600MHz with some loss of sensitivitity at the top end. When the centre frequency is set above about 1250MHz the frequency display becomes random from blank up to some random number. This indicates to me that the control voltage is unstable above that frequency setting. The display looks like it is jumping all over the spectrum (have I discovered 'spread spectrum').
Any suggestions as to a likely cause or common problem before I delve into the murky depths.
Thanks
Dick G4BBH
[Non-text portions of this message have been removed]
|
Re: 8558B centre frequency wildly unstable above 1250MHz
Noisy / Intermittent / Bad tuning potentiometer?
-Greg
toggle quoted message
Show quoted text
----- Original Message -----
From: ferrymanr
To: hp_agilent_equipment@...
Sent: Sunday, August 28, 2011 4:26 PM
Subject: [hp_agilent_equipment] 8558B centre frequency wildly unstable above 1250MHz
I have an 8558B which becomes totally unstable if the centre frequency is set above about 1250MHz at any span setting. If the span is sufficiently wide it is clear that the SA it is covering perfectly up to about 1550MHz or 1600MHz with some loss of sensitivitity at the top end. When the centre frequency is set above about 1250MHz the frequency display becomes random from blank up to some random number. This indicates to me that the control voltage is unstable above that frequency setting. The display looks like it is jumping all over the spectrum (have I discovered 'spread spectrum').
Any suggestions as to a likely cause or common problem before I delve into the murky depths.
Thanks
Dick G4BBH
|
8558B centre frequency wildly unstable above 1250MHz
I have an 8558B which becomes totally unstable if the centre frequency is set above about 1250MHz at any span setting. If the span is sufficiently wide it is clear that the SA it is covering perfectly up to about 1550MHz or 1600MHz with some loss of sensitivitity at the top end. When the centre frequency is set above about 1250MHz the frequency display becomes random from blank up to some random number. This indicates to me that the control voltage is unstable above that frequency setting. The display looks like it is jumping all over the spectrum (have I discovered 'spread spectrum').
Any suggestions as to a likely cause or common problem before I delve into the murky depths.
Thanks
Dick G4BBH
|
Re: Want to buy: HP 3325A attenuator board
Hi Dickson,
Yes, my attenuator board has the Rev C part number as you surmised below. However the exposed circuit traces appear to be gold plated.
The serial number of my unit starts with 1748A13xxx, so I think that it was produced fairly early in that product's lifecycle.
Patrick Wong AK6C
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--- In hp_agilent_equipment@..., "Dickson" <dicksonfuhk@...> wrote:
I think Patrick's attenuator board is the newer "03325-66523 Rev C" which used the relay made by Aromat (Japan). I think Aromat is being merged with the Japanese giant Panasonic.
It seems to me "Rev C" is a cost down version because it is not longer having the gold plated PCB.
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Re: HP436A LED Display Driver IC - HP1820-1361 - 9374DC - Where to get?
You might try Tanner Electronics in Dallas. Jimmy Tanner used to carry many of the old logic families, and he might still have some around. I think he still has a website, but you will have to phone or email for part info.
Dave
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On 8/28/2011 2:42 PM, mrcschrdrs wrote: According to the 436 manual, 1820-1361 is a Fairchild 9374DC.
From the schematic it looks like some BCD to 7 segment decoder. Quite a different beast then the 75491 which seems to be just 4 drivers.
Now where to get one - salvage one from an other 436?
Marc.
--- In hp_agilent_equipment@..., francesco messineo<francesco.messineo@...> wrote:
Hello,
On 8/28/11, m_elec_guy<mm777888@...> wrote:
Hi Group, I've got a HP436A with a defective LED display decoder IC
(A1U1...U4 - all same type of chip). Only 1 IC is bad, the others are fine.
I can't seem to find a replacement or substitute. Does anyone know where
one can get a replacement? From the cross reference I have, it's reported as equivalent to
SN75491 display driver.
Best regards
Frank
------------------------------------
Yahoo! Groups Links
|
Re: HP436A LED Display Driver IC - HP1820-1361 - 9374DC - Where to get?
On 8/28/11, mrcschrdrs <mrcschrdrs@...> wrote:
According to the 436 manual, 1820-1361 is a Fairchild 9374DC.
From the schematic it looks like some BCD to 7 segment decoder.
ops, then the cross reference floating around on the internet isn't at all accurate. You can try the NTE8374 equivalent or try to adapt a CD4511 (which is BCD latch/decoder/driver, you'd need to make an adapter board I think). Best regards Frank
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Re: HP436A LED Display Driver IC - HP1820-1361 - 9374DC - Where to get?
And again ... they are available "over there" !!
73, Dick, W1KSZ
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-----Original Message----- From: mrcschrdrs <mrcschrdrs@...>
Sent: Aug 28, 2011 12:42 PM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: HP436A LED Display Driver IC - HP1820-1361 - 9374DC - Where to get?
According to the 436 manual, 1820-1361 is a Fairchild 9374DC.
From the schematic it looks like some BCD to 7 segment decoder.
Quite a different beast then the 75491 which seems to be just 4 drivers.
Now where to get one - salvage one from an other 436?
Marc.
--- In hp_agilent_equipment@..., francesco messineo <francesco.messineo@...> wrote:
Hello,
On 8/28/11, m_elec_guy <mm777888@...> wrote:
Hi Group, I've got a HP436A with a defective LED display decoder IC
(A1U1...U4 - all same type of chip). Only 1 IC is bad, the others are fine.
I can't seem to find a replacement or substitute. Does anyone know where
one can get a replacement? From the cross reference I have, it's reported as equivalent to
SN75491 display driver.
Best regards
Frank
------------------------------------
Yahoo! Groups Links
|
