|
Greetings,
?
Does anyone know where I might obtain a full schematic for the Agilent 34461A?
?
TIA,
Keith Harvey
|
Keith, that one is probably too new to have a schematic available.? Blame the suits at HPAK and everywhere else for that.? BTW, we have several of the 34461A DMMs around Raytheon where I work, so if you have a question about how to operate it, or is it supposed to do this, or whatever, I'm happy to check it out on one of the ones at work.? HTH.
Jim Ford Laguna Hills California USA
On Saturday, October 5, 2024 at 03:41:04 PM CDT, Keith Harvey <keithh534@...> wrote:
Greetings,
?
Does anyone know where I might obtain a full schematic for the Agilent 34461A?
?
TIA,
Keith Harvey
|
Hi Jim,
Thank you for the insight and offer to assist.
The unit I have has some burned components on the main PCB.
If I send a list of the silkscreen component designations, can you open one up and determine the manufacturer part numbers?
I'm one of those people who refuses to pay an outrageous sum to replace the entire board when a few dollars of replaceable components are the only thing necessary to make the device functional, again.
Just in case you are able and willing to do this, I've included the component designations:
CR1008
E1005
Q1003
U1005
E1002
I've also attached pictures of the locations of these components.
BTW: "No" is an acceptable response.
Regards,
Keith Harvey
toggle quoted message
Show quoted text
Keith, that one is probably too new to have a schematic available.? Blame the suits at HPAK and everywhere else for that.? BTW, we have several of the 34461A DMMs around Raytheon where I work, so if you have a question about
how to operate it, or is it supposed to do this, or whatever, I'm happy to check it out on one of the ones at work.? HTH.
Jim Ford
Laguna Hills
California
USA
On Saturday, October 5, 2024 at 03:41:04 PM CDT, Keith Harvey <keithh534@...> wrote:
Greetings,
?
Does anyone know where I might obtain a full schematic for the Agilent 34461A?
?
TIA,
Keith Harvey
|
Looks a bit like E1006 may have leaked a bit... the rest looks like dust so it may not be as bad as first thought - I suggest a clean up initially and maybe remove E1006 for inspection and a check, then proceed as you plan. Regards? Nigel by banging a nail into a piece of wood...
toggle quoted message
Show quoted text
On 6 Oct 2024, at 15:04, Keith Harvey via < keithh534@...> wrote:
Hi Jim,
Thank you for the insight and offer to assist.
The unit I have has some burned components on the main PCB.
If I send a list of the silkscreen component designations, can you open one up and determine the manufacturer part numbers?
I'm one of those people who refuses to pay an outrageous sum to replace the entire board when a few dollars of replaceable components are the only thing necessary to make the device functional, again.
Just in case you are able and willing to do this, I've included the component designations:
CR1008
E1005
Q1003
U1005
E1002
I've also attached pictures of the locations of these components.
BTW: "No" is an acceptable response.
Regards,
Keith Harvey
Keith, that one is probably too new to have a schematic available.? Blame the suits at HPAK and everywhere else for that.? BTW, we have several of the 34461A DMMs around Raytheon where I work, so if you have a question about
how to operate it, or is it supposed to do this, or whatever, I'm happy to check it out on one of the ones at work.? HTH.
Jim Ford
Laguna Hills
California
USA
On Saturday, October 5, 2024 at 03:41:04 PM CDT, Keith Harvey < keithh534@...> wrote:
Greetings,
?
Does anyone know where I might obtain a full schematic for the Agilent 34461A?
?
TIA,
Keith Harvey
<IMG_8605.jpg>
<IMG_8606.jpg>
|
Oooh, I'm sure I would get in big trouble if I were to open up one of the 34461As at work!? Even opening up a way-out-of-warranty 8510 or 8753 or 8566 could even be a career-limiting move.
Punching the buttons and seeing what it does - that I can do; removing the cover - no.? Sorry about that.
Jim
On Sunday, October 6, 2024 at 10:05:13 AM CDT, nigel adams via groups.io <bristol.rell6l@...> wrote:
Looks a bit like E1006 may have leaked a bit... the rest looks like dust so it may not be as bad as first thought - I suggest a clean up initially and maybe remove E1006 for inspection and a check, then proceed as you plan. Regards? Nigel by banging a nail into a piece of wood...
Hi Jim,
Thank you for the insight and offer to assist.
The unit I have has some burned components on the main PCB.
If I send a list of the silkscreen component designations, can you open one up and determine the manufacturer part numbers?
I'm one of those people who refuses to pay an outrageous sum to replace the entire board when a few dollars of replaceable components are the only thing necessary to make the device functional, again.
Just in case you are able and willing to do this, I've included the component designations:
CR1008
E1005
Q1003
U1005
E1002
I've also attached pictures of the locations of these components.
BTW: "No" is an acceptable response.
Regards,
Keith Harvey
Keith, that one is probably too new to have a schematic available.? Blame the suits at HPAK and everywhere else for that.? BTW, we have several of the 34461A DMMs around Raytheon where I work, so if you have a question about
how to operate it, or is it supposed to do this, or whatever, I'm happy to check it out on one of the ones at work.? HTH.
Jim Ford
Laguna Hills
California
USA
On Saturday, October 5, 2024 at 03:41:04 PM CDT, Keith Harvey < keithh534@...> wrote:
Greetings,
?
Does anyone know where I might obtain a full schematic for the Agilent 34461A?
?
TIA,
Keith Harvey
<IMG_8605.jpg>
<IMG_8606.jpg>
|
Thanks, Jim. I understand and figured that might be the case.
toggle quoted message
Show quoted text
On Oct 6, 2024, at 3:19?PM, Jim Ford <james.ford@...> wrote:
?
Oooh, I'm sure I would get in big trouble if I were to open up one of the 34461As at work!? Even opening up a way-out-of-warranty 8510 or 8753 or 8566 could even be a career-limiting move.
Punching the buttons and seeing what it does - that I can do; removing the cover - no.? Sorry about that.
Jim
On Sunday, October 6, 2024 at 10:05:13 AM CDT, nigel adams via groups.io <bristol.rell6l@...> wrote:
Looks a bit like E1006 may have leaked a bit... the rest looks like dust so it may not be as bad as first thought - I suggest a clean up initially and maybe remove E1006 for inspection and a check, then proceed as you plan.
Regards?
Nigel
by banging a nail into a piece of wood...
Hi Jim,
Thank you for the insight and offer to assist.
The unit I have has some burned components on the main PCB.
If I send a list of the silkscreen component designations, can you open one up and determine the manufacturer part numbers?
I'm one of those people who refuses to pay an outrageous sum to replace the entire board when a few dollars of replaceable components are the only thing necessary to make the device functional, again.
Just in case you are able and willing to do this, I've included the component designations:
CR1008
E1005
Q1003
U1005
E1002
I've also attached pictures of the locations of these components.
BTW: "No" is an acceptable response.
Regards,
Keith Harvey
Keith, that one is probably too new to have a schematic available.? Blame the suits at HPAK and everywhere else for that.? BTW, we have several of the 34461A DMMs around Raytheon where I work, so if you have a question about how to operate it,
or is it supposed to do this, or whatever, I'm happy to check it out on one of the ones at work.? HTH.
Jim Ford
Laguna Hills
California
USA
On Saturday, October 5, 2024 at 03:41:04 PM CDT, Keith Harvey < keithh534@...> wrote:
Greetings,
?
Does anyone know where I might obtain a full schematic for the Agilent 34461A?
?
TIA,
Keith Harvey
<IMG_8605.jpg>
<IMG_8606.jpg>
|
Hi Keith, ? This is some pictures from my 34465A. ? Yves ? Thank you for the insight and offer to assist. The unit I have has some burned components on the main PCB. If I send a list of the silkscreen component designations, can you open one up and determine the manufacturer part numbers? I'm one of those people who refuses to pay an outrageous sum to replace the entire board when a few dollars of replaceable components are the only thing necessary to make the device functional, again. Just in case you are able and willing to do this, I've included the component designations: I've also attached pictures of the locations of these components. BTW: "No" is an acceptable response.
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> on behalf of Jim Ford <james.ford@...>
Sent: Saturday, October 5, 2024 4:56 PM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Agilent 34461A schenmatic Keith, that one is probably too new to have a schematic available.? Blame the suits at HPAK and everywhere else for that.? BTW, we have several of the 34461A DMMs around Raytheon where I work, so if you have a question about how to operate it, or is it supposed to do this, or whatever, I'm happy to check it out on one of the ones at work.? HTH. On Saturday, October 5, 2024 at 03:41:04 PM CDT, Keith Harvey <keithh534@...> wrote: Does anyone know where I might obtain a full schematic for the Agilent 34461A?
|
Sorry I couldn't be of much help, Keith.? Say, now I'm curious, what kind of components do those E reference designators stand for?? The only time I've seen that used was at Powerwave (now out of business) where they were solder connection points for coaxial cables.? Are those ferrite beads or something?? Enquiring minds want to know!???? Jim
On Sunday, October 6, 2024 at 08:02:49 PM CDT, Yves Tardif <yves_tardif@...> wrote:
Hi Keith, ? This is some pictures from my 34465A. ? Yves ? Thank you for the insight and offer to assist. The unit I have has some burned components on the main PCB. If I send a list of the silkscreen component designations, can you open one up and determine the manufacturer part numbers? I'm one of those people who refuses to pay an outrageous sum to replace the entire board when a few dollars of replaceable components are the only thing necessary to make the device functional, again. Just in case you are able and willing to do this, I've included the component designations: I've also attached pictures of the locations of these components. BTW: "No" is an acceptable response.
From: [email protected] <[email protected]> on behalf of Jim Ford <james.ford@...>
Sent: Saturday, October 5, 2024 4:56 PM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Agilent 34461A schenmatic Keith, that one is probably too new to have a schematic available.? Blame the suits at HPAK and everywhere else for that.? BTW, we have several of the 34461A DMMs around Raytheon where I work, so if you have a question about how to operate it, or is it supposed to do this, or whatever, I'm happy to check it out on one of the ones at work.? HTH. On Saturday, October 5, 2024 at 03:41:04 PM CDT, Keith Harvey <keithh534@...> wrote: Does anyone know where I might obtain a full schematic for the Agilent 34461A?
|
These appear to be ferrite chokes.
Value may not be overly important.
Usually used to pass DC and reduce RF on a line.
Glenn
WB4UIV
On 10/6/2024 9:39 PM, Jim Ford wrote:
Sorry I couldn't be of much
help, Keith.? Say, now I'm curious, what kind of components do
those E reference designators stand for?? The only time I've
seen that used was at Powerwave (now out of business) where
they were solder connection points for coaxial cables.? Are
those ferrite beads or something?? Enquiring minds want to
know!???? Jim
Hi
Keith,
?
This
is some pictures from my 34465A.
?
Yves
?
Thank you
for the insight and offer to assist.
The unit I
have has some burned components on the main PCB.
If I send
a list of the silkscreen component designations,
can you open one up and determine the
manufacturer part numbers?
I'm one of
those people who refuses to pay an outrageous
sum to replace the entire board when a few
dollars of replaceable components are the only
thing necessary to make the device functional,
again.
Just in
case you are able and willing to do this, I've
included the component designations:
I've also
attached pictures of the locations of these
components.
BTW: "No"
is an acceptable response.
Keith, that one is
probably too new to have a schematic
available.? Blame the suits at HPAK and
everywhere else for that.? BTW, we have
several of the 34461A DMMs around Raytheon
where I work, so if you have a question
about how to operate it, or is it supposed
to do this, or whatever, I'm happy to check
it out on one of the ones at work.? HTH.
On
Saturday, October 5, 2024 at 03:41:04 PM
CDT, Keith Harvey <keithh534@...>
wrote:
Does
anyone know where I might obtain a
full schematic for the Agilent 34461A?
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
|
E usually designates a ferrite bead in my experience.? At least I've seen HP manuals do this.
?
Also, Jim what do you do for work that you would get in trouble for opening up your equipment?? Hopefully not a repair tech? Just curious.
?
-Frank
|
I'll take photos from my 34461A when I get home from work if you like?
?
?
Jared
|
Ok, I am used to FB for ferrite beads; E is a new one on me.? ?I'm a professional EE working on airborne military radar subsystems for Raytheon at the moment. The 34416A DMMs are leased and belong to the program (government).? No way am I going to risk voiding warranty or calibration.? ? Jim
On Sun, Oct 6, 2024 at 9:49 PM, Jared Cabot via groups.io <jaredcabot@...> wrote: I'll take photos from my 34461A when I get home from work if you like?
?
?
Jared
|
Thank you Jared.
I don't know how helpful photos will be unless they clearly show the manufacturer part number, but it's certainly worth a try.
toggle quoted message
Show quoted text
I'll take photos from my 34461A when I get home from work if you like?
?
?
Jared
|
Gotcha. That makes perfect sense!?
?
Looks like someone will help with photos, but when I'm dealing with unknown parts it is helpful sometimes to trace out the circuit a bit. If youre interested in knowing what that IC is for example. This is especially helpful for when a search comes up with multiple part #s. At least you can identify this is an op-amp, regulator, etc.?
|
See if these images are of any help.
?
?
?
?
?
I tried to get the markings as clear as possible, as clear as my phone could manage anyway......
?
?
Regards,
Jared
?
?
?
On Mon, Oct 7, 2024 at 10:27 PM, Keith Harvey wrote:
Thank you Jared.
?
I don't know how helpful photos will be unless they clearly show the manufacturer part number, but it's certainly worth a try.
|
Thanks for the effort, Jared!
toggle quoted message
Show quoted text
See if these images are of any help.
?
?
?
?
?
I tried to get the markings as clear as possible, as clear as my phone could manage anyway......
?
?
Regards,
Jared
?
?
?
On Mon, Oct 7, 2024 at 10:27 PM, Keith Harvey wrote:
Thank you Jared.
?
I don't know how helpful photos will be unless they clearly show the manufacturer part number, but it's certainly worth a try.
|
Hi Keith, ? I checked my 34410A and my 34465A, and unfortunately, I don't have a 34461A. However, they all have the same function to perform, that is to say from +10V, provide a voltage of +3.3V, +1.2V and possibly +2.5V. A switcher lowers a DC voltage from about +10V to +3.3V, the frequency of the switcher is about 1.3MHz for both instruments. The 34461A has the same part numbers as the 34465A, there is a very good chance that the 34465A and 34461A have the same circuit for the section concerned. ? I don't know if this can help you, but you have an idea of ??the damaged circuit. I don't have the part numbers unfortunately, only the marking codes or the Keysight part numbers. ? I repaired a 34461A a few months ago, the +3.3V switch was not damaged, but there was a short circuit on the +3.3V line caused by a faulty capacitor. ? Waveform measured at output switcher connected to coil. ? Yves
|
Hi Yves,
Thank you for the insight.
If you have the Agilent part numbers for the components I listed, that might prove helpful.
Regards,
Keith Harvey
toggle quoted message
Show quoted text
Hi Keith,
?
I checked my 34410A and my 34465A, and unfortunately, I don't have a 34461A.
However, they all have the same function to perform, that is to say from +10V, provide a voltage of +3.3V, +1.2V and possibly +2.5V.
A switcher lowers a DC voltage from about +10V to +3.3V, the frequency of the switcher is about 1.3MHz for both instruments.
The 34461A has the same part numbers as the 34465A, there is a very good chance that the 34465A and 34461A have the same circuit for the section concerned.
?
I don't know if this can help you, but you have an idea of ??the damaged circuit.
I don't have the part numbers unfortunately, only the marking codes or the Keysight part numbers.
?
I repaired a 34461A a few months ago, the +3.3V switch was not damaged, but there was a short circuit on the +3.3V line caused by a faulty capacitor.
?
Waveform measured at output switcher connected to coil.
?
Yves
|
I just discovered the partial schematic you attached.
Thank you! That will be of great assistance.
toggle quoted message
Show quoted text
Hi Yves,
Thank you for the insight.
If you have the Agilent part numbers for the components I listed, that might prove helpful.
Regards,
Keith Harvey
Hi Keith,
?
I checked my 34410A and my 34465A, and unfortunately, I don't have a 34461A.
However, they all have the same function to perform, that is to say from +10V, provide a voltage of +3.3V, +1.2V and possibly +2.5V.
A switcher lowers a DC voltage from about +10V to +3.3V, the frequency of the switcher is about 1.3MHz for both instruments.
The 34461A has the same part numbers as the 34465A, there is a very good chance that the 34465A and 34461A have the same circuit for the section concerned.
?
I don't know if this can help you, but you have an idea of ??the damaged circuit.
I don't have the part numbers unfortunately, only the marking codes or the Keysight part numbers.
?
I repaired a 34461A a few months ago, the +3.3V switch was not damaged, but there was a short circuit on the +3.3V line caused by a faulty capacitor.
?
Waveform measured at output switcher connected to coil.
?
Yves
|
? As specified in the last email, I don't have the part numbers unfortunately, only the marking codes or the Keysight part numbers. Also, I can't find these part numbers on the Keysight website. ? If I were in your situation, I would first look for a 1.3MHz 8 pin switcher with the same package. And from the circuit and the coil value, I would try to see if the pin out seems compatible, and if the installed coil would be compliant with a 1.3MHz operating frequency. ? A friend of mine probably has a 34461A that he could lend me, but don't expect to have more details on the part numbers, but I could take the waveforms at the switcher pins. I am not absolutely sure that the switcher of the 34461A and 34465A are identical because I do not have a detailed photo of this section for the 34461A, but the coil value is the same. ? 
? ? ? Thank you for the insight. If you have the Agilent part numbers for the components I listed, that might prove helpful.
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Show quoted text
From: [email protected] <[email protected]> on behalf of Yves Tardif <yves_tardif@...>
Sent: Monday, October 7, 2024 11:58 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Agilent 34461A schenmatic Hi Keith, ? I checked my 34410A and my 34465A, and unfortunately, I don't have a 34461A. However, they all have the same function to perform, that is to say from +10V, provide a voltage of +3.3V, +1.2V and possibly +2.5V. A switcher lowers a DC voltage from about +10V to +3.3V, the frequency of the switcher is about 1.3MHz for both instruments. The 34461A has the same part numbers as the 34465A, there is a very good chance that the 34465A and 34461A have the same circuit for the section concerned. ? I don't know if this can help you, but you have an idea of ??the damaged circuit. I don't have the part numbers unfortunately, only the marking codes or the Keysight part numbers. ? I repaired a 34461A a few months ago, the +3.3V switch was not damaged, but there was a short circuit on the +3.3V line caused by a faulty capacitor. ? Waveform measured at output switcher connected to coil. ? Yves
|
Frank Mashockie
Jared Cabot
