Hello!
I am new to this group, old engineer, a ham (S57UUU), and playing with radio astronomy.
I have a HP3048 setup, which is working well (knock on wood). I am using the DOS software. For now I can store the results only graphically, using a screen grabber ("screen thief"). The software will write a data file, but it is binary, and somehow, I can't figure it out. Used a hex editor which can also represent the data as floats, etc. but no luck.
Does maybe somebody have the format specification for these files?
Marko Cebokli
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I better keep going to the gym so I can help move collections like this in the future.
Then I can save on the gym memberships and get my workouts that way.
There looks to be an increasing amount of gear popping up and decreasing interest, sadly.
Peter
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On 6/21/2024 10:18 AM, Mike Feher via groups.io wrote:
Sadly, that is true. And, that is just the lab. About 5% of what is here. Now, at my age, I cannot lift them ?. Another thing for my kids to worry about. ¨C Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
908-902-3831
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Peter Gottlieb
Sent: Friday, June 21, 2024 10:12 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References
You still have significant tonnage there.
Peter
On 6/21/2024 9:48 AM, Mike Feher via groups.io wrote:
When I was still using my lab, I used a single Rubidium to run everything. Now, everything is just sitting there dormant. 73 ¨C Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 908-902-3831 -----Original Message----- From: [email protected] <mailto:[email protected]>
<[email protected] <mailto:[email protected]>> On Behalf Of Chuck Harris
Sent: Friday, June 21, 2024 8:32 AM To: [email protected] <mailto:[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References More importantly, they will be out of phase because they will be set to different frequencies... If you had a farm of synthesizers, all identical, they would still likely be set to different phases because they started generating at different times.
-Chuck Harris
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Interfacing the HP3490A with AR488
Hello everyone,
I am trying to control an HP3490A DVM from a PC via GPIB with an Arduino-based AR488, using PuTTY as the user interface.
So far, two things already work :
- When the 3490A is in "talk only" mode, measurement data is received and displayed as expected
- When in "addressed" mode, I am able to control the functions of the 3490A (select functions, switch ranges etc ...) as explained in table 3-7, page 3-10 of the 3490A manual.
However, when in "addressed" mode, I can control the 3490A but I can't receive measurement results over the HP-IB. It seems that the 3490A requires the ATN line to be activated, but the AR488 manual doesn't provide any information on how to do that.
Is there anything "special" which must be done to read data from the 3490A ?
Any help would be appreciated ... the 3490A is a very nice beast !
Thanks,
Joel Setton
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Sadly, that is true. And, that is just the lab. About 5% of what is here. Now, at my age, I cannot lift them ?. Another thing for my kids to worry about. ¨C Mike ? Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 908-902-3831 ?
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-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Peter Gottlieb
Sent: Friday, June 21, 2024 10:12 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References ? You still have significant tonnage there. ? Peter ? ? On 6/21/2024 9:48 AM, Mike Feher via groups.io wrote: >? > When I was still using my lab, I used a single Rubidium to run everything. > Now, everything is just sitting there dormant. 73 ¨C Mike >? > Mike B. Feher, N4FS >? > 89 Arnold Blvd. >? > Howell NJ 07731 >? > 908-902-3831 >? > -----Original Message----- > From: [email protected] > <[email protected]> On Behalf Of Chuck Harris > Sent: Friday, June 21, 2024 8:32 AM > To: [email protected] > Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References >? > More importantly, they will be out of phase because they will be set > to different frequencies... >? > If you had a farm of synthesizers, all identical, they would still > likely be set to different phases because they started generating at different times. >? > -Chuck Harris >? > ? ? ? ?
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You still have significant tonnage there.
Peter
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On 6/21/2024 9:48 AM, Mike Feher via groups.io wrote:
When I was still using my lab, I used a single Rubidium to run everything. Now, everything is just sitting there dormant. 73 ¨C Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
908-902-3831
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Chuck Harris
Sent: Friday, June 21, 2024 8:32 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References
More importantly, they will be out of phase because they will be set to different frequencies...
If you had a farm of synthesizers, all identical, they would still likely be set to different phases because they started generating at different times.
-Chuck Harris
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Re: Are HP 70900A and HP 70900B interchangeable ?
There is no 70902B, only A...
On Thursday, June 20, 2024 at 03:51:18 PM GMT+2, gren <hrgerson@...> wrote:
hi Ron. For additional info: See: the Hp70k thread on the eevBlog:
The Hp 70902b FW can be upgraded to a newer version. There *might* be an (unreasonable) way to mod a 70902a > to a "b" version, .... but would be an extensive rabbit hole ! See: Groups.io files section /g/hp70000/filesand KO4BB.
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When I was still using my lab, I used a single Rubidium to run everything. Now, everything is just sitting there dormant. 73 ¨C Mike ? Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 908-902-3831 ?
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-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Chuck Harris
Sent: Friday, June 21, 2024 8:32 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References ? More importantly, they will be out of phase because they will be set to different frequencies... ? If you had a farm of synthesizers, all identical, they would still likely be set to different phases because they started generating at different times. ? -Chuck Harris ?
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The specs are listed in the microfiche that CuriousMarc scanned, see fiche 004 page 16 for the 1854-0800 and page 23 for the 1853-0450 & 1853-0453, none have a generic part listed.
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On Fri, Jun 21, 2024 at 12:38 PM, Harold Foster wrote:
On Fri, Jun 21, 2024 at 07:06 AM, Peter Gottlieb wrote:
You'd really hate working in aerospace where every part, COTS or not, is effectively the same way.
And substitutions are *not* allowed - or, at least the approved substitutions are just as old and made of unobtanium as the preferred part. Sigh.
Beware of obsolete part suppliers, you can end up with relabelled substitute parts, we certainly did at work for train related equipment. David
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On Fri, Jun 21, 2024 at 07:06 AM, Peter Gottlieb wrote:
You'd really hate working in aerospace where every part, COTS or not, is effectively the same way.
And substitutions are *not* allowed - or, at least the approved substitutions are just as old and made of unobtanium as the preferred part. Sigh.
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Very often, "part selected" means that assembly put a part, straight
from the bins into the unit, and calibration found that it failed
to calibrate... So, the technician selected another part from the bin,
and it worked.
They might not be totally aware of why.
-Chuck Harris
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On Thu, 20 Jun 2024 20:58:11 -0700 "tgerbic" <tgerbic@...> wrote: I really get annoyed when I see things like "MJE371K? selected" in
parts lists. HP, Tek and even Heathkit has lots of them with separate
numbers. Problem is that they never tell you what it is selected for
such as gain, leakage, input capacitance, or maybe frequency
response. Worse is that the selected part might actually be a
non-selected off the shelf part which might be more expensive or
harder to get. Decision might have been made by a parts buyer
controlling costs. Really makes repair tricky.? It would be nice to
get scans of the microfiche for the selected parts so we can see what
they were selected for. Just my opinion here... -- T. Gerbic Central
California
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More importantly, they will be out of phase because they will be set to different frequencies... If you had a farm of synthesizers, all identical, they would still likely be set to different phases because they started generating at different times. -Chuck Harris On Fri, 21 Jun 2024 05:15:31 -0700 "Ed (scskits)" <scskits@...> wrote: Kit:
That is correct, most instruments will be out of phase with each
other due to their internal circuitry or by when they were powered ON
assuming the reference was there before power ON. Some like the
33120A function generator have the ability to adjust the phase offset
to sync up two or more generators.
ed
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I have seen parts selected by data, date code, manufacturer (if more than one), and manufacturer assembly location.
I'm sure I may have missed a few other reasons. Also tested a lot of parts back in the day for radiation hardness.
Some may be surprised to see the selection of parts by manufacturer assembly location.
It was not uncommon to have issues with parts from one plant vs another.
Got a lot of "but the board has worked for years" only to find the "bad" parts were from a plant in a different country than the original parts.
In most cases some parameter was overlooked or had been changed.
ed
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That is a useful effort.
Many times a circuit can be understood sufficiently by an engineer to suggest a good or better replacement but it's hit or miss depending on the circuit and engineer.? To do it right for even one part may be time-consuming so such a repository is of great help.
Peter
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On 6/21/2024 5:24 AM, Michael A. Terrell via groups.io wrote: The 1854-0800 (NSN 5961-01-147-2387) was replaced by 1854-0456, which is a TIP41A. ZNTE offers its NTE331 as a replacement. Here is their datasheet:
I am slowly compiling a single cross reference of HP parts, This requiress a lot of time to sort out duplicates, and to find whatever data id available on each part. I curently? have 23 groups in HTML to make it easy to search. Their is a main index that akes you to each catagory, although some may end up split into smaller groups. I will star shring them when I get them looking a little better. It is simple HTML which can be zipped? to install a local copy on your computer.
On Thu, Jun 20, 2024 at 4:03?PM Joe White via groups.io <> <skinnershorse@...> wrote:
These are from the power supply board of a 3325.? Per OSM they are p/n
03325-66901, 03325-66902, 03325-66903 (left to right), described as "XSTR
ASSEMBLY".? The manufacturer is listed as HP.? I have not found the part
numbers in any cross-reference lists and I have been unable to identify
the parts by their markings.? Any help on identifying the parts and/or
replacements is greatly appreciated.
--
Joe White
KW4YW
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Kit:
That is correct, most instruments will be out of phase with each other due to their internal circuitry or by when they were powered ON assuming the reference was there before power ON.
Some like the 33120A function generator have the ability to adjust the phase offset to sync up two or more generators.
ed
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You'd really hate working in aerospace where every part, COTS or not, is effectively the same way.
Peter
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On 6/20/2024 11:58 PM, tgerbic via groups.io wrote: I really get annoyed when I see things like "MJE371K? selected" in parts lists. HP, Tek and even Heathkit has lots of them with separate numbers. Problem is that they never tell you what it is selected for such as gain, leakage, input capacitance, or maybe frequency response. Worse is that the selected part might actually be a non-selected off the shelf part which might be more expensive or harder to get. Decision might have been made by a parts buyer controlling costs. Really makes repair tricky.? It would be nice to get scans of the microfiche for the selected parts so we can see what they were selected for.
Just my opinion here...
--
T. Gerbic
Central California
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The 1854-0800 (NSN 5961-01-147-2387) was replaced by 1854-0456, which is a TIP41A. ZNTE offers its NTE331 as a replacement. Here is their datasheet:
I am slowly compiling a single cross reference of HP parts, This requiress a lot of time to sort out duplicates, and to find whatever data id available on each part. I curently? have 23 groups in HTML to make it easy to search. Their is a main index that akes you to each catagory, although some may end up split into smaller groups. I will star shring them when I get them looking a little better. It is simple HTML which can be zipped? to install a local copy on your computer.
On Thu, Jun 20, 2024 at 4:03?PM Joe White via <skinnershorse= [email protected]> wrote: These are from the power supply board of a 3325.? Per OSM they are p/n 03325-66901, 03325-66902, 03325-66903 (left to right), described as "XSTR ASSEMBLY".? The manufacturer is listed as HP.? I have not found the part numbers in any cross-reference lists and I have been unable to identify the parts by their markings.? Any help on identifying the parts and/or replacements is greatly appreciated.
--
Joe White
KW4YW
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Jinxie,??
Assume you mean that using a common (10MHz etc) reference for your lab equipment that all connected instruments will be (hopefully!) phase locked, but certainly not all 'in phase'.? By that I mean zero-crossings of all instruments will not occur at the same time.? ?The vagaries of English never cease to amaze ...)
Regards
Kit? VK1LL?
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I really get annoyed when I see things like "MJE371K? selected" in parts lists. HP, Tek and even Heathkit has lots of them with separate numbers. Problem is that they never tell you what it is selected for such as gain, leakage, input capacitance, or maybe frequency response. Worse is that the selected part might actually be a non-selected off the shelf part which might be more expensive or harder to get. Decision might have been made by a parts buyer controlling costs. Really makes repair tricky.? It would be nice to get scans of the microfiche for the selected parts so we can see what they were selected for.
Just my opinion here...
--
T. Gerbic
Central California
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Yes, everything in the 8566 is phase locked ultimately to the 10 MHz reference, except for the "FREQ ZERO" (I think that's the control name) oscillator, which is a crystal oscillator at 18.4 MHz. Its function is to down-convert the 21.4 MHz IF down to the 3 MHz IF of the narrow band crystal filter sections, then back up to the 21.4 MHz for final processing. It is necessarily not locked to the reference, but slightly adjustable from the front panel of the IF/display section. This allows for fine tuning of the system to match the actual center frequency of the crystal filters, which can drift with temperature. The 18.4 MHz also drifts, so the tweak pot is really for both.
You can see the importance of this by setting up a narrow RBW like 10 or 30 Hz display after first turning it on, then adjusting the FREQ ZERO to maximize the peak reading. You'll see the amplitude drift downward as it continues to warm up, then later after it's fully warmed up, it will be more stable, but it still can drift more over time. That's why you should always fully warm it up, and check and adjust it before doing high resolution work, and occasionally check it while working.
Also, the first LO is not phase locked during wide frequency spans, while it is for narrow ones. It doesn't matter much in wide, since you can't resolve the frequencies on the screen anyway. As I recall, the beginning of a wide sweep is calibrated (by virtue of temporary phase locking), but then is open-loop for the rest.
Ed
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You're dealing with entirely subjective quantities, which means that "I feel" is predominant.? "I measure" had little or no meaning.
That explains a bit.
"the less it can be measured, the more important it is....." (me.....)
Harvey
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On 6/20/2024 10:23 PM, Matt Harris wrote: Roy, with one difference... Time and volt nuts chase quantifiable metrics with measureable and definable absolute values using standardized nomenclature and accepted methodology. Audiophools measure nebulous metrics with values such as "warmth", "brightness", and my favorite, "presence", while throwing out the factual formulas and ideas like ohms law and human ear response because they love brand X better than Y. Also, in the audiophool world, quality is always directly proportional to the cost if the device. ?
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factory
Harold Foster
Michael A. Terrell
Kit