Re: Anybody have schematics or link for schematics of HP 3488A switch control unit?
Hi Tim,
I have this document ; HP-3488A-90012 3488A Service manual
I downloaded that from the Agilent website .
I do not know if it is still available there.
Look for it and if you do not find it I am happy to upload it to KO4BB.
Regards,
Jos Raven PA0AMX
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Re: HP 53310A POST errors
OK. Different Problem than mine. Check the big capacitor on the GFX board, and the fuse -- With best regards Tam HANNA (emailing on a keyboard-less handset, sorry for spelling mistakes and brevity) Am 19. April 2019 07:17:03 MESZ schrieb Jack2015 <tolkien@...>:
After power on,all 8 leds were on for less than one second,then 6,then 4,then all leds were off (completed power on self test)
after a little while the leds flashed one after one in sequence.(each time only one led was on).
I kept front panel faced up and powered it on for couple minutes,then?powered it off and on again
while holding one button,for couple times,but nothing changed.
Jack
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Re: Anybody have schematics or link for schematics of HP 3488A switch control unit?
Hi Tim, I've the service manual, send me your private mail and I send this to you.
Dario IU3ARP
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Re: HP 53310A POST errors
After power on,all 8 leds were on for less than one second,then 6,then 4,then all leds were off (completed power on self test)
after a little while the leds flashed one after one in sequence.(each time only one led was on).
I kept front panel faced up and powered it on for couple minutes,then?powered it off and on again
while holding one button,for couple times,but nothing changed.
Jack
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Agilent 54845a Infiniium 1.5 GHz Scope Trigger self-test Failures
My Agilent 54845a?consistently ?throws ?Trigger self-tests ?"Failed" ?, ?for all of the extended Trigger tests; ?on all 4 channels.
The scope boots without issues & can measure & display the Sq. wave signal from the Aux Out, & other RF signals Ok, (with knobs twiddled manually).
It passes all of the other?extended?self-tests, ?.... just Not any of the ?Trigger tests.? ??It also fails the Calibration, due to the Trigger self-test issues.?
-- Is there an IC/relay hardware problem related to Trigger self-test failures ??If so, where to look on the ADC board or Attn. modules for Trigger issues ? ?(Service Man does not have schematics)?
I have cleaned the ADC chips with IPA, & examined the Acq board for solder/IC placement issues, but see nothing remarkable, visually.
Have examined various 54845a ? YouTube videos, ?EEVBlogs, ?& the MIT repair Blog ?& some old Agilent/Keysight forums, ?that mention Trigger self-test issues,
? but, not seen a Trigger self-test solution, yet. ? ?Perhaps missed it ?
The scope is a late period 54845a, VIN# 033, ?SW: 4.50, with 8-slots at the back,?including 2-USB ports.
thank you,
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Re: Anybody have schematics or link for schematics of HP 3488A switch control unit?
I did some more searching and found this website which has a bit of information on the switch mode power supply and lots of pictures:
On Thursday, April 18, 2019, 7:28:10 PM PDT, Tim hughes <timhughes@...> wrote:
Keysight website only has operator manuals and similarly BAMA has operator/programming manuals like 03488-90002 or 3 etc.
The manual numbered? 03488-90009 is supposed to be the repair manual. But I could not find a free download.??
From the title it sounds more like a block level repair manual. But it does have some sort of schematics.?
I am only really interested in schematics particularly the power supplies.
Any help appreciated.
Tim Hughes
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Anybody have schematics or link for schematics of HP 3488A switch control unit?
Keysight website only has operator manuals and similarly BAMA has operator/programming manuals like 03488-90002 or 3 etc.
The manual numbered? 03488-90009 is supposed to be the repair manual. But I could not find a free download.??
From the title it sounds more like a block level repair manual. But it does have some sort of schematics.?
I am only really interested in schematics particularly the power supplies.
Any help appreciated.
Tim Hughes
|
Re: HP 53310A POST errors
Also, please try to raise the unit with the "rabbis grip" . Power it on for like half a Minute, then hold any front panel Button, power it off and on again while Holding the button. If we can restore functionality with this measure, then the ZeroPower RAM is hit. This is likely, as my 53310A needed a self cal after the incident. (Darn BlackBerry keyboard and it's capitalization)
With best regards Tam HANNA (emailing on a BlackBerry PRIV) Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at Am 19. April 2019 03:55:56 MESZ schrieb Jack2015 <tolkien@...>:
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Tam
We might have chance to find out what causes the problem because the same issue came back again
after working perfectly for two days.
Jack
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Re: HP 53310A POST errors
Now I am wide awake. Please check if all the LEDs on the CPU assembly (below the Boeschert cartridge) are lit steady!
With best regards Tam HANNA (emailing on a BlackBerry PRIV) Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at Am 19. April 2019 03:55:56 MESZ schrieb Jack2015 <tolkien@...>:
toggle quoted message
Show quoted text
Tam
We might have chance to find out what causes the problem because the same issue came back again
after working perfectly for two days.
Jack
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Re: HP 53310A POST errors
Tam
We might have chance to find out what causes the problem because the same issue came back again
after working perfectly for two days.
Jack
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Re: 16517a maximum signal speed
On Thu, 18 Apr 2019 18:02:28 -0400, you wrote: Steve,
Thanks for the comments. This background definitely helps me, at least.
On 4/18/2019 5:19 PM, Steve Hendrix wrote:
Like you, I have long used the rule of sampling 4x to 10x the
signal frequency, unless the wave shape is particularly important. The
above shows where the 4x comes from; it mostly suppresses the appearance
of modulation. You have to get out around 10x, where you're guaranteed
to sample within at worst 18? of the peak, to really suppress that
aliasing effect. It does occur to me that where the wave shape is often important is when
viewing analog waveforms, it's less important when capturing digital
data. It seems that for digital, I don't see an obvious reason why
having, let's call it three samples, wouldn't be sufficient to know that
a pulse occurred at that time. You'd know that a pulse happened, but you'd be limited in time resolution to the sampling rate. 3.5 samples? 3.1 samples? 3.9 samples, no idea. 2.9 samples ought to tell you something, though, you just can't tell it from 2.0 samples. And to show proper relationship with the
other signals. Subject to the above quantization, that is....
I appreciate that there are signal integrity issues, analog
characteristics of the digital waveform, that could cause problems. Like
maybe over/undershooting, slew rate, sub-sample glitches --- or if your
logic analyzer isn't setup properly like Peter mentioned. For instance,
if the logic devices you're using are CMOS, but you have the analyzer
set to TTL.
That'll work. You'll see the pulses since the output thresholds are about 50 mV away from VCC and ground.
Having a mixed signal device that can be useful, but if we're spending
our time in the digital domain, less samples seems like less of a crime
to me. Sound right?
no, I think you get bitten by time quantization.
Of course, I simply just avoid problems altogether by having plenty of
sample horsepower.
Best solution when you've got it. Harvey
Thanks again,
Keith
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Re: 16517a maximum signal speed
Steve, Thanks for the comments. This background definitely helps me, at least. On 4/18/2019 5:19 PM, Steve Hendrix wrote: Like you, I have long used the rule of sampling 4x to 10x the signal frequency, unless the wave shape is particularly important. The above shows where the 4x comes from; it mostly suppresses the appearance of modulation. You have to get out around 10x, where you're guaranteed to sample within at worst 18? of the peak, to really suppress that aliasing effect. It does occur to me that where the wave shape is often important is when viewing analog waveforms, it's less important when capturing digital data. It seems that for digital, I don't see an obvious reason why having, let's call it three samples, wouldn't be sufficient to know that a pulse occurred at that time. And to show proper relationship with the other signals. I appreciate that there are signal integrity issues, analog characteristics of the digital waveform, that could cause problems. Like maybe over/undershooting, slew rate, sub-sample glitches --- or if your logic analyzer isn't setup properly like Peter mentioned. For instance, if the logic devices you're using are CMOS, but you have the analyzer set to TTL. Having a mixed signal device that can be useful, but if we're spending our time in the digital domain, less samples seems like less of a crime to me. Sound right? Of course, I simply just avoid problems altogether by having plenty of sample horsepower. Thanks again, Keith
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Re: Need an 8558B Freq/ Span/Div Knob
Walter, I have a junker unit next to my desk I use for parts. ?I think all the knobs are still there. ?On the road though and won’t be back till Monday? Regards, ? Stephen Hanselman Datagate Systems, LLC 3107 North Deer Run Road #24 Carson City, Nevada, 89701 (775) 882-5117?office (775) 720-6020?mobile s.hanselman@...
a Service Disabled, Veteran Owned Small Business DISCLAIMER: This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.
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On Apr 18, 2019, at 09:08, walter shawlee < walter2@...> wrote: I got a nice older hp 8558B/182C spectrum analyzer from a friend when he passed away recently. Everything seems to be working, but the large, rear Frequency Span/Div knob (hpn: 08558-20162) is missing.? incredibly, I found the front part of the knob (Resolution Span hpn: 08558-2-161) in my spare parts, so I am halfway there. Does anyone have that rear knob they will sell or trade? I can send a pic if interested.
I also found a factory boxed 8555-60073 attenuator assembly in my spare parts if anybody can use it in that older spec an unit.
saturday's stuff day event was great, we had about 200 visitors, and got rid of a lot of parts and material.
not quite enough to clear out that storage building, but it's getting closer.? many thanks to everybody that came
or got items remotely!
any help appreciated.
all the best,
walter
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Re: 16517a maximum signal speed
Another data point recommendation from the manufacturer, in their "Evaluating Logic Analyzers Objectively" document:
"Timing mode – Select a timing analyzer with a sampling rate of 4 to 10
times your bus data rate"
(see PDF page 8)
Assuming you have the right pods/probes and everything is perfect, and you're running in timing mode using the internal sampling clock(by definition) at 4ghz, then surely the top would be 1.5ghz or something.
Your data is almost always going to be asynchronous to the internal clock, and you'd always want at least a couple data points per state.
If you're sampling every 250ps, then surely you'd want your minimum pulse width that you'd be capturing to be a couple samples wide at a minimum.
Can you tell us more about the application? What are you trying to capture? What would the approximate minimum pulse width you're expecting to capture?
Undersampling the data, which I've certainly done before, produces results where you're apparently missing pulses but don't really know it. Some of these cards support glitch-detection where they realize the data has changed between samples. I haven't used it directly afaik, though. By sticking to the rules of thumb, I'm never undersampling.
Keith
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On 4/18/2019 4:24 PM, Ethan Waldo wrote: Assuming "perfect" probing?? I'm trying to be clear on the capabilities of the card as a starting point.
Sent from my Samsung Galaxy smartphone.
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Re: 16517a maximum signal speed
At 2019-04-18 03:04 PM, Keith Monahan via Groups.Io
wrote:
Nyquist says 2x the signal
frequency absolute minimum.
Pardon me if I'm out of place, but I'll chime in here about the
"Nyquist frequency fable", which I have fought for years. What
Nyquist actually said was that sampling any slower than 2x is guaranteed
to give aliasing, not the converse, which is usually attributed to him.
In fact I did a whole magazine article on that some years back (I don't
remember, maybe for Electronic Design) illustrating this very topic. You
also have to remember that the theory is based on sampling both the real
and imaginary parts, which in effect means sampling at the 0, 90, 180,
and 270 phase points of the signal and thus at 4x the highest frequency
component. You can easily demonstrate the fallacy by taking a 1 KHz sine
wave and sampling it at 4.1 KSPS. What comes out the other end looks like
it's amplitude-modulated at a low frequency, something like the beat of
the sampling frequency and a multiple of the sine wave frequency. Like
you, I have long used the rule of sampling 4x to 10x the signal
frequency, unless the wave shape is particularly important. The above
shows where the 4x comes from; it mostly suppresses the appearance of
modulation. You have to get out around 10x, where you're guaranteed to
sample within at worst 18? of the peak, to really suppress that aliasing
effect.
Of course aliasing can be quite useful, too - that's essentially the
basis of a superhet receiver!
</soapbox>
Steve Hendrix
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Re: 16517a maximum signal speed
That's great then.? I've got about a 1.2Ghz digital signal I need to analyze and can clock it down for state analysis.? Just wanted to make sure I wasn't looking at a max of 500-600MHz even in timing mode.
Sent from my Samsung Galaxy smartphone.
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-------- Original message --------
From: "Harvey White via Groups.Io" <madyn@...>
Date: 4/18/19 4:33 PM (GMT-05:00)
Subject: Re: [HP-Agilent-Keysight-equipment] 16517a maximum signal speed
On Thu, 18 Apr 2019 20:14:52 +0000, you wrote:
>That's what I'm trying to determine, if the 1-4Ghz is talking analog sampling or digital sampling.? What is the maximum digital signal speed (i.e. 1's and 0's) I can expect the card to be able to reproduce with the internal 4Ghz clock?
As far as I know, the card does digital.? Glitch catching may be at a
lower frequency because of the need for additional clocks and data
patterns.? The data goes into a comparator, and is then stored.? If
the data storage were analog, then it'd be a small oscilloscope, with
perhaps a flash converter (and those are only so fast) and I think
you'd have a lower sampling rate.
The specs on the card may tell you the different rates for different
conditions.? Store/transistion limited/glitch catching all have
different capture rates.
Harvey
>
>Sent from my Samsung Galaxy smartphone.
>
>
>-------- Original message --------
>From: "Glen Slick via Groups.Io" <glen.slick@...>
>Date: 4/18/19 3:59 PM (GMT-05:00)
>To: [email protected]
>Subject: Re: [HP-Agilent-Keysight-equipment] 16517a maximum signal speed
>
>Yeah, if someone wanted to sample in timing mode a signal that was
>switching at a 4GHz rate that wouldn't work, if that was what the
>original question was. It wasn't clear what the digital vs. analog
>part of the original question meant.
>
>On Thu, Apr 18, 2019 at 12:39 PM Peter Gottlieb <hpnpilot@...> wrote:
>>
>> It is important if the sampling is asynchronous to a clocked signal.
>>
>> If synchronous, the only question is whether the analyzer can handle the clock rate, and you can go right up to it.
>
>
>
>
>
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Re: Fuse holder for hp 437B
Hi Emst
Yes I have a spare removable fuse carrier and am in the UK. ?I also have a 437B and have checked that the 432A fuse does fit it.
Please send me your address to G6HIG at Yahoo dot com.
73 George G6HIG
On Thursday, April 18, 2019 9:35 PM, Dave W6TE <w6te@...> wrote:
Ernst,
?
If you will send me your address I’ll send you a fuse cap. Are you good in qrz.com?
?
73,
?
Dave W6TE
?
?
Thanks for all replies on part number etc,? Will try to find out a german supplier to avoid high shipping cost.
@George G6HIG
Yes, I only need the removable part. Enclosed a picture of the holder to make sure it is same you have. If it fits I would be glad to accept you offer. Of course I will compensate your expenses.
Ernst
|
Re: Fuse holder for hp 437B
Ernst,
?
If you will send me your address I’ll send you a fuse cap. Are you good in qrz.com?
?
73,
?
Dave W6TE
?
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From: [email protected] < [email protected]>
On Behalf Of dk1vi
Sent: Thursday, April 18, 2019 9:29 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Fuse holder for hp 437B
?
Thanks for all replies on part number etc,? Will try to find out a german supplier to avoid high shipping cost.
@George G6HIG
Yes, I only need the removable part. Enclosed a picture of the holder to make sure it is same you have. If it fits I would be glad to accept you offer. Of course I will compensate your expenses.
Ernst
|
Re: 16517a maximum signal speed
On Thu, 18 Apr 2019 20:14:52 +0000, you wrote: That's what I'm trying to determine, if the 1-4Ghz is talking analog sampling or digital sampling. What is the maximum digital signal speed (i.e. 1's and 0's) I can expect the card to be able to reproduce with the internal 4Ghz clock? As far as I know, the card does digital. Glitch catching may be at a lower frequency because of the need for additional clocks and data patterns. The data goes into a comparator, and is then stored. If the data storage were analog, then it'd be a small oscilloscope, with perhaps a flash converter (and those are only so fast) and I think you'd have a lower sampling rate. The specs on the card may tell you the different rates for different conditions. Store/transistion limited/glitch catching all have different capture rates. Harvey
Sent from my Samsung Galaxy smartphone.
-------- Original message --------
From: "Glen Slick via Groups.Io" <glen.slick@...>
Date: 4/18/19 3:59 PM (GMT-05:00)
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 16517a maximum signal speed
Yeah, if someone wanted to sample in timing mode a signal that was
switching at a 4GHz rate that wouldn't work, if that was what the
original question was. It wasn't clear what the digital vs. analog
part of the original question meant.
On Thu, Apr 18, 2019 at 12:39 PM Peter Gottlieb <hpnpilot@...> wrote:
It is important if the sampling is asynchronous to a clocked signal.
If synchronous, the only question is whether the analyzer can handle the clock rate, and you can go right up to it.
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Re: 16517a maximum signal speed
Including aliasing effects?
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On Apr 18, 2019, at 4:24 PM, Ethan Waldo < ewaldo@...> wrote:
Assuming "perfect" probing?? I'm trying to be clear on the capabilities of the card as a starting point.
Sent from my Samsung Galaxy smartphone.
-------- Original message --------
Date: 4/18/19 4:16 PM (GMT-05:00)
Subject: Re: [HP-Agilent-Keysight-equipment] 16517a maximum signal speed
How the instrument is set up is important. A surprising number of engineers I’ve run into in companies don’t understand how to set up a logic analyzer.
Peter
> On Apr 18, 2019, at 3:59 PM, Glen Slick < glen.slick@...> wrote:
>
> Yeah, if someone wanted to sample in timing mode a signal that was
> switching at a 4GHz rate that wouldn't work, if that was what the
> original question was. It wasn't clear what the digital vs. analog
> part of the original question meant.
>
>> On Thu, Apr 18, 2019 at 12:39 PM Peter Gottlieb < hpnpilot@...> wrote:
>>
>> It is important if the sampling is asynchronous to a clocked signal.
>>
>> If synchronous, the only question is whether the analyzer can handle the clock rate, and you can go right up to it.
>
>
>
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Jos Raven PA0AMX
Dario
Keith Monahan
Dave Smith