Re: Agilent 44xx ESG RF Generator question
Hi all,
and a 401 point sweep with minimal dwell time of 1ms takes around 22-23s to complete.
Br
Marcus
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Re: Agilent 44xx ESG RF Generator question
Hi, ? The E44xx series generators do not have continuous sweep. So, as you mentioned, there are sweep from a list or by defined step, but only for 401 points maximum. ? Yves ? Hello,
I am considering the purchase of an RF generator for R&D and RF alignment purposes.? Looking at the Agilent 44xx series, it looks like the sweep functions are Step and List Sweeps.? I read the manual for these generators and could not find any reference to a continuous frequency sweep.? Has anyone experience with these to clarify?? In order to see ripple on a filter passband, continuous sweeps would be most valuable.
Cheers! Howard Hoyt
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Agilent 44xx ESG RF Generator question
Hello,
I am considering the purchase of an RF generator for R&D and RF alignment purposes.? Looking at the Agilent 44xx series, it looks like the sweep functions are Step and List Sweeps.? I read the manual for these generators and could not find any reference to a continuous frequency sweep.? Has anyone experience with these to clarify?? In order to see ripple on a filter passband, continuous sweeps would be most valuable.
Cheers!
Howard Hoyt
|
Re: HP141T SA Blowing Fuses
Listen to Dave Wise. His info on the TL431 fix for the Krypton doped neon lamp works very well.
It’s in the group photo section, page 4 I think. Add the diode he mentions in the text for better thermal stability.
Chris
W9RP
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On Feb 15, 2022, at 2:53 PM, Steve Hendrix <SteveHx@...> wrote:
?I had a very similar rig and had to replace the fuses with slo-blo types. That feels like mostly a band-aid, but it worked.
Steve Hendrix
On 2022-02-15 02:05 PM, Tim Barrett K9VB wrote:
I was recently given an HP141T / 8552B / 8554B spectrum analyzer by a retired electronics engineer. It looks ine xcellent condition and I believe he would have looked after it. He warned me that it tended to blow fuses when it had not been powered up for a while and he even gave me a pack of 1 amp fuses.
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Re: Stuff Season opens for 2022 Tuesday at Sphere
I apologize, it was just a suggestion.
On Tue, Feb 15, 2022 at 11:15 AM walter shawlee < walter2@...> wrote: we have done exactly that, yet the flames continue.
-walter
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Re: HP141T SA Blowing Fuses
I had a very similar rig and had to replace the fuses with slo-blo types. That feels like mostly a band-aid, but it worked.
Steve Hendrix
toggle quoted message
Show quoted text
On 2022-02-15 02:05 PM, Tim Barrett K9VB wrote: I was recently given an HP141T / 8552B / 8554B spectrum analyzer by a retired electronics engineer. It looks ine xcellent condition and I believe he would have looked after it.? He warned me that it tended to blow fuses when it had not been powered up for a while and he even gave me a pack of 1 amp fuses.
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Re: HP141T SA Blowing Fuses
This is a well-known problem.? The glow-tube voltage reference (V1) may not read high on a voltmeter, but it is “lazy” starting up, and during that time the power supply output overshoots.? If it goes high enough long enough, it will activate
the “crowbar” protection circuit in the 8552, which shorts the rail to ground and pops the fuse.
?
The easiest fix is to replace the glow tube with a solid-state reference.? Ed Breya came up with a simple design using a TL431 solid-state zener.? Search the groups.io HPAK forum for topic and photo album titled “141T reference replacement”.?
Here’s a direct link to the schematic:
/g/HP-Agilent-Keysight-equipment/photo/68333/805596?p=created%2C%2C141t+reference+replacement%2C20%2C2%2C0%2C0
?
This mod can be tacked across the glow tube, you don’t even need to remove it.
?
Dave Wise
?
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From: [email protected] < [email protected]>
On Behalf Of Tim Barrett K9VB via groups.io
Sent: Tuesday, February 15, 2022 11:06 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP141T SA Blowing Fuses
?
I was recently given an HP141T / 8552B / 8554B spectrum analyzer by a retired electronics engineer. It looks ine xcellent condition and I believe he would have looked after it.? He warned me that it tended to
blow fuses when it had not been powered up for a while and he even gave me a pack of 1 amp fuses. Guess what, he hadn’t powered it up in a while and it just eats 1A fuses – there are two in the IF section both fed by the 141T 12.6v supply. So far blowing fuses
is just about all it does though I can see a cursor on the screen since the 141T gets its power before the blown fuse. I’m more familiar with simpler test gear so I need to tread slowly and carefully!
?
I had read here that the 82 volt stabilizer tube goes high with age and was hoping that was it. But the voltage across the tube reads 81.9 so it is not the problem. The LV voltage levels are mostly within tolerance
(just): +248v is 248, +100v and -100v both read 99 but the -12.6v is only 12. That needs adjustment, but later – it is not the cause of fuse blowing.
?
At this stage I’m not sure if the cause is an initial surge from the 141T at power on or if the plug-ins are drawing too much current. Since sometimes both fuses blow in the IF unit, one feeding the 12.6v supply
and the other 10V my thoughts are more that the problem lies in the 141T. I have downloaded the service manual from BAMA so I have schematics.??Are there any obvious things I should be checking?
?
Tim
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Re: HP141T SA Blowing Fuses
There are a number of neon lamps in the power supply circuits that act as simple voltage references. As they age, the 'strike' voltage increases and eventually gets high enough that circuitry down the line draws too much current, blowing the fuses. The fix is to replace all the neons.
Jeremy N6WFO
On Tue, Feb 15, 2022 at 11:16 AM n4buq < n4buq@...> wrote: Maybe a dumb question, but is this, by chance, a case of using a fast-blow fuse where a slow-blow fuse is specified?
Thanks,
Barry - N4BUQ
From: "Tim Barrett K9VB" <timbarrett@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Tuesday, February 15, 2022 1:05:37 PM
Subject: [HP-Agilent-Keysight-equipment] HP141T SA Blowing Fuses
I was recently given an HP141T / 8552B / 8554B spectrum analyzer by a retired electronics engineer. It looks ine xcellent condition and I believe he would have looked after it.? He warned me that it tended to blow fuses when it had not been powered up for a while and he even gave me a pack of 1 amp fuses. Guess what, he hadn’t powered it up in a while and it just eats 1A fuses – there are two in the IF section both fed by the 141T 12.6v supply. So far blowing fuses is just about all it does though I can see a cursor on the screen since the 141T gets its power before the blown fuse. I’m more familiar with simpler test gear so I need to tread slowly and carefully!
?
I had read here that the 82 volt stabilizer tube goes high with age and was hoping that was it. But the voltage across the tube reads 81.9 so it is not the problem. The LV voltage levels are mostly within tolerance (just): +248v is 248, +100v and -100v both read 99 but the -12.6v is only 12. That needs adjustment, but later – it is not the cause of fuse blowing.
?
At this stage I’m not sure if the cause is an initial surge from the 141T at power on or if the plug-ins are drawing too much current. Since sometimes both fuses blow in the IF unit, one feeding the 12.6v supply and the other 10V my thoughts are more that the problem lies in the 141T. I have downloaded the service manual from BAMA so I have schematics.??Are there any obvious things I should be checking?
?
Tim
|
Re: HP141T SA Blowing Fuses
Maybe a dumb question, but is this, by chance, a case of using a fast-blow fuse where a slow-blow fuse is specified?
Thanks,
Barry - N4BUQ
From: "Tim Barrett K9VB" <timbarrett@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Tuesday, February 15, 2022 1:05:37 PM
Subject: [HP-Agilent-Keysight-equipment] HP141T SA Blowing Fuses
I was recently given an HP141T / 8552B / 8554B spectrum analyzer by a retired electronics engineer. It looks ine xcellent condition and I believe he would have looked after it.? He warned me that it tended to blow fuses when it had not been powered up for a while and he even gave me a pack of 1 amp fuses. Guess what, he hadn’t powered it up in a while and it just eats 1A fuses – there are two in the IF section both fed by the 141T 12.6v supply. So far blowing fuses is just about all it does though I can see a cursor on the screen since the 141T gets its power before the blown fuse. I’m more familiar with simpler test gear so I need to tread slowly and carefully!
?
I had read here that the 82 volt stabilizer tube goes high with age and was hoping that was it. But the voltage across the tube reads 81.9 so it is not the problem. The LV voltage levels are mostly within tolerance (just): +248v is 248, +100v and -100v both read 99 but the -12.6v is only 12. That needs adjustment, but later – it is not the cause of fuse blowing.
?
At this stage I’m not sure if the cause is an initial surge from the 141T at power on or if the plug-ins are drawing too much current. Since sometimes both fuses blow in the IF unit, one feeding the 12.6v supply and the other 10V my thoughts are more that the problem lies in the 141T. I have downloaded the service manual from BAMA so I have schematics.??Are there any obvious things I should be checking?
?
Tim
|
I was recently given an HP141T / 8552B / 8554B spectrum analyzer by a retired electronics engineer. It looks ine xcellent condition and I believe he would have looked after it.? He warned me that it tended to blow fuses when it had not been powered up for a while and he even gave me a pack of 1 amp fuses. Guess what, he hadn’t powered it up in a while and it just eats 1A fuses – there are two in the IF section both fed by the 141T 12.6v supply. So far blowing fuses is just about all it does though I can see a cursor on the screen since the 141T gets its power before the blown fuse. I’m more familiar with simpler test gear so I need to tread slowly and carefully!
?
I had read here that the 82 volt stabilizer tube goes high with age and was hoping that was it. But the voltage across the tube reads 81.9 so it is not the problem. The LV voltage levels are mostly within tolerance (just): +248v is 248, +100v and -100v both read 99 but the -12.6v is only 12. That needs adjustment, but later – it is not the cause of fuse blowing.
?
At this stage I’m not sure if the cause is an initial surge from the 141T at power on or if the plug-ins are drawing too much current. Since sometimes both fuses blow in the IF unit, one feeding the 12.6v supply and the other 10V my thoughts are more that the problem lies in the 141T. I have downloaded the service manual from BAMA so I have schematics.??Are there any obvious things I should be checking?
?
Tim
|
Re: Stuff Season opens for 2022 Tuesday at Sphere
Walter -
I do understand the issues you describe and I apologize for perhaps being overly critical. Additionally, most of my criticism is from some time ago.
We ALL have hot button issues, this is one of mine.
Cheers!
Bruce
Quoting walter shawlee <walter2@...>:
toggle quoted message
Show quoted text
Bruce,
that situation is very frustrating for us too. often, first thing in the morning after posting new stuff, when susan checks the order emails, there will be *three people all wanting the same thing that was just posted*. there is simply no good solution for the two later queries, we fill the first request, and have to decline the other two. how could I possibly fix that?
on a related note, we often get people who *say* they want something, but want us to put it aside while they look for other stuff.? we do that, and then they never take anything after weeks have gone by, and after multiple emails to them. we sell the original item, and then get flamed for "not holding it for them".? wow, that is beyond irritating, and it happens literally every single month, and is also frustrating for those that wanted the same item.
so, all I can say is that we try and keep that stuff page updated daily, but that happens at the end of the day, and many items can be gone by then. since I am the *only guy doing all the web page creation and updating* , and have a lot of other work to do, I can get only so much done during one day. my apologies for any inconvenience.
all the best,
walter
sphere research corp.
|
I don'r know at all python anyway i tried but got this error:
? File "dump_fw.py", line 9
??? def dump(mem_addr, length, *, gpib_addr=7, device_addr=0):
?????????????????????????????????????????????????? ^
SyntaxError: invalid syntax
hopefully we can fix so i can dump it
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Re: Stuff Season opens for 2022 Tuesday at Sphere
Will post it on my Instagram now, all the best of business
- - - - -
With best regards
Tam HANNA
Enjoy electronics? Join 13500 followers by visiting the Crazy Electronics Lab at
On 15.02.22 16:24, Jim Ford wrote:
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Show quoted text
Seems like a lot of time and effort to implement.?
Nothing is impossible for the person that doesn't have to do
it.....? No offense, Michael, just reality.? ? ? ? ? Jim Ford
Sent from
my T-Mobile 4G LTE Device
-------- Original message --------
Date: 2/15/22 7:19 AM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Stuff Season
opens for 2022 Tuesday at Sphere
Give them a set time that you will hold something. Maybe
seven days, to the minute. Post the message multiple places on
your website, and in any replies. If they miss that date and
someone else wants it, it's just their tough luck.
This reminds me of a sign that I saw as a kid in a Goodwill
store back in the '60s: 'See it? today, buy it today. Gone
tomorrow!
On Tue, Feb 15, 2022 at 10:02
AM walter shawlee < walter2@...>
wrote:
Bruce,
that situation is very frustrating for us too. often, first
thing in the morning after posting new stuff, when susan
checks the order emails, there will be three people
all wanting the same thing that was just posted.
there is simply no good solution for the two later queries, we
fill the first request, and have to decline the other two. how
could I possibly fix that?
on a related note, we often get people who say
they want something, but want us to put it aside while they
look for other stuff.? we do that, and then they never take
anything after weeks have gone by, and after multiple emails
to them. we sell the original item, and then get flamed for
"not holding it for them".? wow, that is beyond irritating,
and it happens literally every single month, and is also
frustrating for those that wanted the same item.
so, all I can say is that we try and keep that stuff page
updated daily, but that happens at the end of the day, and
many items can be gone by then. since I am the only
guy doing all the web page creation and updating,
and have a lot of other work to do, I can get only so much
done during one day. my apologies for any inconvenience.
all the best,
walter
sphere research corp.
|
Re: HP 8595E Restore and Tracking Generator Questions
Oh, and if you are driving an inductive load like a relay coil, motor, or I suppose an incandescent bulb or a speaker, don't forget the flyback diode to protect the driving transistor.? A fast recovery diode, reverse biased in normal operation, will shunt the inductive flyback kick around the transistor.? ? Jim
Sent from my T-Mobile 4G LTE Device
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Show quoted text
-------- Original message -------- From: Dave Wright <davewrightsplace@...> Date: 2/15/22 8:36 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP 8595E Restore and Tracking Generator Questions
Jim, HP uses a mechanically latched relay in the 8593E and others. But, the drive circuit is not an impulse type. The current is continuous, and leads to excess dissipation in the coils. Details here:? /g/HP-Agilent-Keysight-equipment/topic/31717125#96700_Dave KC6UPS
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Re: HP 8595E Restore and Tracking Generator Questions
I figured as much. In that case, one would need to set the current high enough to reliably kick-start the relay coil but low enough not to burn up the coil.? Assuming that's possible. May not always be.....? ? ? ? ? ?Jim
Sent from my T-Mobile 4G LTE Device
toggle quoted message
Show quoted text
-------- Original message -------- From: Dave Wright <davewrightsplace@...> Date: 2/15/22 8:36 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP 8595E Restore and Tracking Generator Questions
Jim, HP uses a mechanically latched relay in the 8593E and others. But, the drive circuit is not an impulse type. The current is continuous, and leads to excess dissipation in the coils. Details here:? /g/HP-Agilent-Keysight-equipment/topic/31717125#96700_Dave KC6UPS
|
Re: HP 8595E Restore and Tracking Generator Questions
Jim, HP uses a mechanically latched relay in the 8593E and others. But, the drive circuit is not an impulse type. The current is continuous, and leads to excess dissipation in the coils. Details here:? /g/HP-Agilent-Keysight-equipment/topic/31717125#96700_Dave KC6UPS
|
Re: Stuff Season opens for 2022 Tuesday at Sphere
some folks are never
happy no matter what you do and that cannot be fixed.
you do the best you can at being fair and reasonable, then move
on.
搁别苍é别
On 2/15/22 8:15 AM, walter shawlee
wrote:
toggle quoted message
Show quoted text
we have done exactly that, yet the flames
continue.
-walter
|
Re: Stuff Season opens for 2022 Tuesday at Sphere
we have done exactly that, yet the flames continue.
-walter
|
Re: HP - Agilent - Keysight 853A Spectrum Analyzer Display
Hello, I want to buy one HP - Agilent - Keysight 853A Spectrum Analyzer Display unity.
Rasonable price send private email.
Francesco.
?
?
Sent:?Tuesday, February 15, 2022 at 11:14 AM
From:?"Francesco" <realfran@...>
To:[email protected]
Subject:?[HP-Agilent-Keysight-equipment] HP - Agilent - Keysight 853A Spectrum Analyzer Display
Hello, I luck to buy one HP - Agilent - Keysight 853A Spectrum Analyzer Display unity.
send private email.
Francesco.
|
Re: Stuff Season opens for 2022 Tuesday at Sphere
Seems like a lot of time and effort to implement.? Nothing is impossible for the person that doesn't have to do it.....? No offense, Michael, just reality.? ? ? ? ? Jim Ford
Sent from my T-Mobile 4G LTE Device
toggle quoted message
Show quoted text
-------- Original message -------- From: "Michael A. Terrell" <terrell.michael.a@...> Date: 2/15/22 7:19 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] Stuff Season opens for 2022 Tuesday at Sphere
Give them a set time that you will hold something. Maybe seven days, to the minute. Post the message multiple places on your website, and in any replies. If they miss that date and someone else wants it, it's just their tough luck. This reminds me of a sign that I saw as a kid in a Goodwill store back in the '60s: 'See it? today, buy it today. Gone tomorrow!
On Tue, Feb 15, 2022 at 10:02 AM walter shawlee < walter2@...> wrote: Bruce,
that situation is very frustrating for us too. often, first thing in the morning after posting new stuff, when susan checks the order emails, there will be three people all wanting the same thing that was just posted. there is simply no good solution for the two later queries, we fill the first request, and have to decline the other two. how could I possibly fix that?
on a related note, we often get people who say they want something, but want us to put it aside while they look for other stuff.? we do that, and then they never take anything after weeks have gone by, and after multiple emails to them. we sell the original item, and then get flamed for "not holding it for them".? wow, that is beyond irritating, and it happens literally every single month, and is also frustrating for those that wanted the same item.
so, all I can say is that we try and keep that stuff page updated daily, but that happens at the end of the day, and many items can be gone by then. since I am the only guy doing all the web page creation and updating, and have a lot of other work to do, I can get only so much done during one day. my apologies for any inconvenience.
all the best,
walter
sphere research corp.
|
Michael A. Terrell
Jeremy Nichols
Francesco