Re: Boonton 92BD Troubleshooting
I have a 92B in case you need somebody to poke at parts and give you some readings.
|
Re: 8665B noisy signal & Cal Errors
I have an 8644B which had power supply issues when I purchased it as a non-working auction off at e-site. I traced it to bad connections around the connectors for the power supply. Removing the power connectors where plugs into the motherboard, cleaning good with contact cleaner, and reinstalling seem to clean that up. After that, I discovered a bad frac-n card, which I was able to find rather cheaply. It works pretty good after fixing all these issues, but I usually use the 8663A due to its crystal clean signal. Anyway, I seem to remember seeing that exact same type of thing on mine, and cleaning that molex type connector fixed it. I think HP ended up putting just a bit more current through that connector then there should be, causing problems years later. Hopefully your unit will be just as easy to fix.?
|
Re: Anyone able to do GC or GC-MS on Hp ThinkJet Black ink ( for the Hp ThinkJet 2225 printer; Hp 9226a Or Hp 51604a ink cartridges ) ?
Ed, Just a warning about the ET-3850. I have one. It's lovely but it does try to reach the cloud all the time (yuck) and it does have a waste cartridge. So despite the marketing hype the only waste tank free printer I own is the HP 2225A. I have yet to need to reset the counter for my waste cartridge but as I understand it that software is proprietary. There are sketchy 3rd party flashing tools to do all this but it gives me the creeps not being able to see what is going on under the hood. Ironic if you think about it, I went from an open 1st gen inkjet to a closed product that is advertised as "open". -Evan On Sun, Oct 6, 2024 at 9:23?PM ed breya via groups.io <eb@...> wrote:
Yup, I switched to lasers long ago, mono and color - Brother brand is my favorite. I wouldn't get another inkjet except for something like the Epson ECOtank 3850, with the bottled inks. At least the ink is cheap enough to keep going for a long time despite the waste on head cleaning. I had this one for about a year or two, then gave it to my sister for her art work in need of photo-grade printing, and for heavy document use by her friend for work. It's great for all that, but not so much for sporadic use.
I was going to get another next time it was on sale at Costco, but in the meantime picked up a huge few-year-old HP color laser, then decided that was plenty enough for me, and skipped the Epson. I can always get one if really needed. I actually do have one older inkjet, for emergency use only. About ten or fifteen years ago, these little printers were kind of promo/giveaways like when you bought a new PC, so I saved several over the years, but never opened the inks or used the printers until emergencies came up. Then each got used up as much as possible, then junked out and recycled as soon as it had any print problems. I'm down to my last one, maybe ten years old, sitting on the shelf like new with its instructions, SW install CD, USB cable, and cartridges.
Anyway, I respect inkjets for their simplicity and amazing printing capabilities, but not so much their practicality or lifespan. I've junked out dozens of these and lasers too over decades, so have seen lots of innards of both elegant and crappy designs, and everything in between.
Ed
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Re: Agilent 34461A schenmatic
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
|
Re: Agilent 34461A schenmatic
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"
|
Re: Agilent 34461A schenmatic
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?
|
Re: Anyone able to do GC or GC-MS on Hp ThinkJet Black ink ( for the Hp ThinkJet 2225 printer; Hp 9226a Or Hp 51604a ink cartridges ) ?
Yup, I switched to lasers long ago, mono and color - Brother brand is my favorite. I wouldn't get another inkjet except for something like the Epson ECOtank 3850, with the bottled inks. At least the ink is cheap enough to keep going for a long time despite the waste on head cleaning. I had this one for about a year or two, then gave it to my sister for her art work in need of photo-grade printing, and for heavy document use by her friend for work. It's great for all that, but not so much for sporadic use.
?
I was going to get another next time it was on sale at Costco, but in the meantime picked up a huge few-year-old HP color laser, then decided that was plenty enough for me, and skipped the Epson. I can always get one if really needed. I actually do have one older inkjet, for emergency use only. About ten or fifteen years ago, these little printers were kind of promo/giveaways like when you bought a new PC, so I saved several over the years, but never opened the inks or used the printers until emergencies came up. Then each got used up as much as possible, then junked out and recycled as soon as it had any print problems. I'm down to my last one, maybe ten years old, sitting on the shelf like new with its instructions, SW install CD, USB cable, and cartridges.
?
Anyway, I respect inkjets for their simplicity and amazing printing capabilities, but not so much their practicality or lifespan. I've junked out dozens of these and lasers too over decades, so have seen lots of innards of both elegant and crappy designs, and everything in between.
?
Ed
|
Re: Agilent 34461A schenmatic
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?
|
Re: Anyone able to do GC or GC-MS on Hp ThinkJet Black ink ( for the Hp ThinkJet 2225 printer; Hp 9226a Or Hp 51604a ink cartridges ) ?
had the tray overflow
issue , learned how to clean it periodically/ keep the
cartridges in a sealed container in the fridge, I loved the
inkjet but I did pretty much the same when lazer jet B/W came
reasonable....My Brother 2270 still does the job as
needed...love duplex printing especially for music parts.
¸é±ð²Ô¨¦±ð
On 10/6/24 12:10 PM, Roy J. Tellason,
Sr. via groups.io wrote:
toggle quoted message
Show quoted text
On Sunday 06 October 2024 12:08:07 pm ed breya wrote:
The ink you referred to leaking from inkjet printers was probably due to overloading the trapping material in the bottom. What comes directly out of the cartridges doesn't leak, and isn't accidental. It's just the dirty little secret of inkjet printing, that the head cleaning uses up a helluva lot of ink. The ink in the nozzles is continually drying out when idle, so the machines automatically waste some every so often or on demand if needed. There are various covering mechanisms to slow the drying, but they can only do so much. The waste ink ends up dumped into pads of absorbent material down in the bowels of the printer, to ultimately be thrown away with the rest. After enough time, the pads get totally saturated with ink, and it starts to flow around in the bottom of the machine before it can sufficiently dry out. I'd venture to say maybe half of all ink is used up on head cleaning, and the rest gets put on paper, less whatever is left unused inside the cartridges when they dry up too much or when the machine is tossed.
THIS is why I've pretty much given up on the idea of inkjet printers. I have a LaserJet 1320 sitting here and turn it on when I need to print something, otherwise it just sits there and doesn't use anything up. Love that duplexer, too! :-)
|
Re: Anyone able to do GC or GC-MS on Hp ThinkJet Black ink ( for the Hp ThinkJet 2225 printer; Hp 9226a Or Hp 51604a ink cartridges ) ?
Hi Ed,
The printer in question was very lightly used. Typically, it spent
weeks off, and then would print something, and then go a few weeks
turned off and unused once again. And, when it did get some use,
it seemed like it spent an inordinate amount of time diddling its
nozzles, if you know what I mean...
Life being what it is, it got moved from my wife's desk, to the
counter in the kitchen for a short while... then a longer while...
Just sitting unplugged until someone decided what to do with it.
One day, I decided to move it, and in its excitement, it had left a
yellowish blackish green stain on the granite counter top where it
didn't belong anyway. I am sure you are 100% right in your assessment
of why.
I was maintaining 3 hp inkjet printers for wife, kid, and mother,
and I took all three and scrapped them, replacing them with laser
printers.
No more inkjets for me!
-Chuck Harris
toggle quoted message
Show quoted text
On Sun, 06 Oct 2024 09:08:07 -0700 "ed breya" <eb@...> wrote: Chuck,
The ink you referred to leaking from inkjet printers was probably due
to overloading the trapping material in the bottom. What comes
directly out of the cartridges doesn't leak, and isn't accidental.
It's just the dirty little secret of inkjet printing, that the head
cleaning uses up a helluva lot of ink. The ink in the nozzles is
continually drying out when idle, so the machines automatically waste
some every so often or on demand if needed. There are various
covering mechanisms to slow the drying, but they can only do so much.
The waste ink ends up dumped into pads of absorbent material down in
the bowels of the printer, to ultimately be thrown away with the
rest. After enough time, the pads get totally saturated with ink, and
it starts to flow around in the bottom of the machine before it can
sufficiently dry out. I'd venture to say maybe half of all ink is
used up on head cleaning, and the rest gets put on paper, less
whatever is left unused inside the cartridges when they dry up too
much or when the machine is tossed.
Even the more modern ones like the "ECO-tank" types do it. The ECO
thing about them is that you use bulk ink for refilling, so it's
cheaper and wastes less plastic on all those ever smaller ink
cartridges. They still have to do the head cleaning, and will still
use up the ink whether you print or not. I had one of those Epson
ones that was really nice. One time after sitting idle for too long,
one of the colors got clogged up and it wouldn't print that color.
After several tries at regular cleaning, a little of the color would
show, but still not right. I found the printer has some kind of
super-cleaning mode that you can do if necessary. I ran it, and
watched it go through all sorts of cycles. The print quality
returned, and I could see a noticeable drop in the reservoirs - of
all the colors! So, even though only one color was clogged, it had to
waste a bunch of each to do the cleaning. Good thing the ink is
relatively cheap.
Back to the original topic, it's fun to ponder analysis and recipes
of inks and such, but what I'd like to see is someone with analytical
gear figuring out what's in Deoxit - now there's something much more
interesting, at least to me.
Ed
|
Re: Anyone able to do GC or GC-MS on Hp ThinkJet Black ink ( for the Hp ThinkJet 2225 printer; Hp 9226a Or Hp 51604a ink cartridges ) ?
?
The 2002 Hp MSDS lists the pH at 7.5 to 8.5
?
?
?
?
?
|
Re: Agilent 34461A schenmatic
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>
|
Re: Agilent 34461A schenmatic
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>
|
Re: HP 8557A Start-Up Calibration & Linear Mode - Errors in Manual?
Worked on the SA more today.? I redid the Log amplifier display test so I could share the results (photo below).? You can see the large discrepancy between theoretical and actual voltage values measured at Aux A (vertical deflection signal from 0-0.8V) on the 182T.? The discrepancy is largest from 0-10, 10-20, and then 50-60 and 60-70dB.? This matches my observations during the reference level accuracy test.??
?
At this point it seems more clear that the step gain circuit is not the issue here.? However, I ran through the Step Gain adjustment procedures for coarse and fine reference knobs.? My plan wasn't to make any adjustments and I didn't need to.? For both coarse and fine reference levels, the deviations of +-0.2 div and 20-30mV were met.??
?
So it seems clear now the issue is either with the log amplifier or the vertical driver (assuming there's not something funky mechanical wise on the front end).? The log amplifier board has a 7 stage amplifier of common-base amplifiers buffered by emitter followers.? I've looked at this section of the board and everything looks good.? But I wasn't focusing on the other portions of the circuit.? Specifically, there's an additional 40dB of offset gain applied to the video output.? Perhaps this could be where the issue is?? I'll be looking into this as well as the vertical driver board more closely next.??
?
|
Re: Anyone able to do GC or GC-MS on Hp ThinkJet Black ink ( for the Hp ThinkJet 2225 printer; Hp 9226a Or Hp 51604a ink cartridges ) ?
On Sunday 06 October 2024 12:08:07 pm ed breya wrote: The ink you referred to leaking from inkjet printers was probably due to overloading the trapping material in the bottom. What comes directly out of the cartridges doesn't leak, and isn't accidental. It's just the dirty little secret of inkjet printing, that the head cleaning uses up a helluva lot of ink. The ink in the nozzles is continually drying out when idle, so the machines automatically waste some every so often or on demand if needed. There are various covering mechanisms to slow the drying, but they can only do so much. The waste ink ends up dumped into pads of absorbent material down in the bowels of the printer, to ultimately be thrown away with the rest. After enough time, the pads get totally saturated with ink, and it starts to flow around in the bottom of the machine before it can sufficiently dry out. I'd venture to say maybe half of all ink is used up on head cleaning, and the rest gets put on paper, less whatever is left unused inside the cartridges when they dry up too much or when the machine is tossed.
THIS is why I've pretty much given up on the idea of inkjet printers. I have a LaserJet 1320 sitting here and turn it on when I need to print something, otherwise it just sits there and doesn't use anything up. Love that duplexer, too! :-) -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
|
Hi! My dao5012a oscilloscope horizontal encoder (smooth one) died. Rotation in any direction just slowly move in one same direction.?
I tried to find repair info in this group and Internet but didn't succeed.
Hence questions
1. Is it repairable??
2. Is there a replacement?
?
Thanks!
|
Re: Anyone able to do GC or GC-MS on Hp ThinkJet Black ink ( for the Hp ThinkJet 2225 printer; Hp 9226a Or Hp 51604a ink cartridges ) ?
Chuck,
?
The ink you referred to leaking from inkjet printers was probably due to overloading the trapping material in the bottom. What comes directly out of the cartridges doesn't leak, and isn't accidental. It's just the dirty little secret of inkjet printing, that the head cleaning uses up a helluva lot of ink. The ink in the nozzles is continually drying out when idle, so the machines automatically waste some every so often or on demand if needed. There are various covering mechanisms to slow the drying, but they can only do so much. The waste ink ends up dumped into pads of absorbent material down in the bowels of the printer, to ultimately be thrown away with the rest. After enough time, the pads get totally saturated with ink, and it starts to flow around in the bottom of the machine before it can sufficiently dry out. I'd venture to say maybe half of all ink is used up on head cleaning, and the rest gets put on paper, less whatever is left unused inside the cartridges when they dry up too much or when the machine is tossed.
?
Even the more modern ones like the "ECO-tank" types do it. The ECO thing about them is that you use bulk ink for refilling, so it's cheaper and wastes less plastic on all those ever smaller ink cartridges. They still have to do the head cleaning, and will still use up the ink whether you print or not. I had one of those Epson ones that was really nice. One time after sitting idle for too long, one of the colors got clogged up and it wouldn't print that color. After several tries at regular cleaning, a little of the color would show, but still not right. I found the printer has some kind of super-cleaning mode that you can do if necessary. I ran it, and watched it go through all sorts of cycles. The print quality returned, and I could see a noticeable drop in the reservoirs - of all the colors! So, even though only one color was clogged, it had to waste a bunch of each to do the cleaning. Good thing the ink is relatively cheap.
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Back to the original topic, it's fun to ponder analysis and recipes of inks and such, but what I'd like to see is someone with analytical gear figuring out what's in Deoxit - now there's something much more interesting, at least to me.
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Ed
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Re: Agilent 34461A schenmatic
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...
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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,
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Does anyone know where I might obtain a full schematic for the Agilent 34461A?
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TIA,
Keith Harvey
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<IMG_8606.jpg>
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Re: Who added "HP Innards of the frequency doubler." ?
Bob Albert.? I searched Messages for "innards frequency doubler".
Dave Wise
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From: [email protected] <[email protected]> on behalf of Dr. David Kirkby, Kirkby Microwave Ltd <drkirkby@...>
Sent: Saturday, October 5, 2024 10:40 PM
To: HP Agilent Keysight <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] Who added "HP Innards of the frequency doubler." ?
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There's a directory in the files area called "HP Innards of the frequency doubler." Unfortunately, there's no clue as to what instrument this is related to. I can't see who created the directory. If you know anything about this, please let me
know and I will create an appropriate directory for it.
--
Dr David Kirkby Ph.D
Kirkby Microwave Ltd
Email: drkirkby@...
Web:
Telephone 07910 441670 (UK) or +44 7910 441670 (international)
Registered in England and Wales, company number 08914892.?
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT
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Re: HP 8557A Start-Up Calibration & Linear Mode - Errors in Manual?
Also, just want to make sure I addressed your questions, the resolution bandwidth (RB) accuracy and RB selectivity performance tests check out within spec.? The 3dB points are within +-20% for all RB settings, and selectivity ratios are well within 15:1.? So it seems the Bandwith filter assemblies are not the issue.? The shape of the cal signal looks great throughout all frequency spans and RB settings.? Its the display amplitude where I see the discrepancy.
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I've also verified that the cal signal is indeed -30dBm via an external power meter and sensor.? It is accurate to within +-3MHz as specified in the operator's check.
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Input Attentuator accuracy looks fantastic throughout all settings.??
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In regards to reference level accuracy test, I should mention I am referring to IF gain since the reference level scale changes based on the input attenuator setting.? So from when changing from 0 to 10dB, there is a significant discrepancy in amplitude (when adjusting an external 10db step attenuator in tandem).? Then this resolves itself for settings 20, 30, 40, 50, and 60.? And then for 70, 80, and 90, it falls out of spec again.? Seems to me that might indicate the Step Gain board is fine; perhaps I should be looking more closely at the log amplifier board.? That is what the troubleshooting tree points to as well.
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-Frank?
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Frank Mashockie
