Re: Newbie question about Agilent 53131a Universal Counter
On 2/15/2022 6:41 PM, Andrew Curlik wrote:
I took a video of what I¡¯m seeing.
Drew according to your SA in the video you are putting about -60 dBm into the counter, that will not work.? Try the 10 MHz output from the counter, Dan
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Re: Newbie question about Agilent 53131a Universal Counter
On 2/15/2022 5:20 PM, Andrew Curlik wrote:
Hello all, this may be a stupid question but I just purchased a 53131a with 3GHz option and can¡¯t get a frequency to show up on input 1 or 2.
Drew, If it runs the self test on power up, and you get the message SELFTST: PASS followed by the HPIB address it should then default to Channel 1 frequency measurement.? Simplest check is to connect the 10 MHz output at the back to Channel 1 input, then switch to channel 2 and do the same.? This is all covered in the manual which I'm pretty sure can be found on line.? There is also a full self test you can invoke, details in the (service) manual. There's a lot to learn from the manuals, hours of fun reading :^) Dan ac6ao / g3ncr
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Re: Newbie question about Agilent 53131a Universal Counter
I took a video of what I¡¯m seeing.?
?
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Selling experience, sorry OT again
I sold something on Ebay but my money was put on hold for 2 weeks. My item is already delivered. Here is the explanation:
Me: No one has ever given me less than 100% FB in over 20 years.
12:37:53 UTC Arnel
Yes I totally understand and I can see that the system detected that the account was a casual seller on site. As for your reference, for this not to happen in the future, you need meet these three (3) requirements: You have to be actively selling on site for more than 90 days. The account have more than 25 domestic transactions. The account have more than ?165 total sales. Once you have met these three (3) requirements the funds will never be placed on hold again.
What is more they took 20% and I have to fight to get my funds which I have not yet seen.Maybe they hope some people will forget.
I am looking for an alternative to ebay. Has anyone used Bonanza? What are you guys using? I just started using test-equip-trader.
What about Paypal? Any suggestions or are they still reasonable to use to buy and sell.
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Re: Newbie question about Agilent 53131a Universal Counter
Exact, I mistyped the correct funcion...I have a similar problem on my 53131a but it looks like to be a relay. Ch1 does not work, but if I change to ch2 and back to ch1 it works flawlessly Enviado do meu Tele-Movel Em ter, 15 de fev de 2022 23:03, Andrew Curlik < kb2lmn@...> escreveu:
I¡¯ve selected input 1 and 2 via the Frequency & Ratio button and channel 1 or 2 light blinks. It¡¯s in Run if that¡¯s Auto?? ? No question is stupid, but...have you selected input 1 or input 2? Is it in auto or single? Enviado do meu Tele-Movel Em ter, 15 de fev de 2022 22:28, Andrew Curlik < kb2lmn@...> escreveu: Hello all, this may be a stupid question but I just purchased a 53131a with 3GHz option and can¡¯t get a frequency to show up on input 1 or 2. Being new to this I¡¯m not sure if I have a setting wrong possibly as input 3 functions.?
I¡¯m feeding a 20MHz up to 200MHz 0.0dbm signal from my HP 8656A and the counter won¡¯t show anything on input 1 or 2. When I put signal to port 3 at 200MHz and up I get a frequency reading on the counter. I verified the Signal Generator is working with my spectrum analyzer.?
Drew
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Re: Newbie question about Agilent 53131a Universal Counter
I¡¯ve selected input 1 and 2 via the Frequency & Ratio button and channel 1 or 2 light blinks. It¡¯s in Run if that¡¯s Auto??
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On Feb 15, 2022, at 8:56 PM, Alexandre Souza <alexandre.tabajara@...> wrote:
? No question is stupid, but...have you selected input 1 or input 2? Is it in auto or single? Enviado do meu Tele-Movel Em ter, 15 de fev de 2022 22:28, Andrew Curlik < kb2lmn@...> escreveu: Hello all, this may be a stupid question but I just purchased a 53131a with 3GHz option and can¡¯t get a frequency to show up on input 1 or 2. Being new to this I¡¯m not sure if I have a setting wrong possibly as input 3 functions.?
I¡¯m feeding a 20MHz up to 200MHz 0.0dbm signal from my HP 8656A and the counter won¡¯t show anything on input 1 or 2. When I put signal to port 3 at 200MHz and up I get a frequency reading on the counter. I verified the Signal Generator is working with my spectrum analyzer.?
Drew
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Re: Newbie question about Agilent 53131a Universal Counter
No question is stupid, but...have you selected input 1 or input 2? Is it in auto or single? Enviado do meu Tele-Movel Em ter, 15 de fev de 2022 22:28, Andrew Curlik < kb2lmn@...> escreveu:
Hello all, this may be a stupid question but I just purchased a 53131a with 3GHz option and can¡¯t get a frequency to show up on input 1 or 2. Being new to this I¡¯m not sure if I have a setting wrong possibly as input 3 functions.?
I¡¯m feeding a 20MHz up to 200MHz 0.0dbm signal from my HP 8656A and the counter won¡¯t show anything on input 1 or 2. When I put signal to port 3 at 200MHz and up I get a frequency reading on the counter. I verified the Signal Generator is working with my spectrum analyzer.?
Drew
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Newbie question about Agilent 53131a Universal Counter
Hello all, this may be a stupid question but I just purchased a 53131a with 3GHz option and can¡¯t get a frequency to show up on input 1 or 2. Being new to this I¡¯m not sure if I have a setting wrong possibly as input 3 functions.?
I¡¯m feeding a 20MHz up to 200MHz 0.0dbm signal from my HP 8656A and the counter won¡¯t show anything on input 1 or 2. When I put signal to port 3 at 200MHz and up I get a frequency reading on the counter. I verified the Signal Generator is working with my spectrum analyzer.?
Drew
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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
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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
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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 ¨C 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 ¨C 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 ¨C 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 ¨C 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 ¨C 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 ¨C 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 ¨C 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 ¨C 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: 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@...>:
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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.
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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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KB2LMN
Alexandre Souza
Michael A. Terrell
Jeremy Nichols