Re: Probe Cables for 16801A Logic Analyser
There is a document from Keysight which has a logic analyzer cable compatibility table (page 46) and also describes all the probing accessories which go on the end of the cable (flying leads, etc.).
?
Probing Solutions for Logic Analyzers:
?
? https://www.keysight.com/us/en/assets/7018-06707/data-sheets/5968-4632.pdf
?
-mark
?
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Re: HP 8554B, no RF after first successful run...
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HP 8554B, no RF after first successful run...
Back again, but this time with less power supply woes.? (thanks again for the help!)?
?I took my "new machine" for a little ride last night, I set it to 100mhz and was able to capture the attached image.? ?It felt REALLY good to see!? ? Ran it for an hour or so like this, flipped it off and ate dinner and came back to ONLY noise floor - no signals anymore.? ? ?I've got a little telescoping antenna hooked to it, and i did try to run the calibrator into it but AFTER i noticed problems.? ? ? A little confused, power supplies look OK.? ? Do I start digging into the attenuator / first mixer then?? ? Going to read the manual some more, that thing is THICK but figured I'd put a call out to the experts.? ??
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Yes. But I prefer Verilog, simply because I wrote much more Verilog and SystemVerilog that VHDL.
DaveD
KC0WJN
Thanks for all the fish.
==============================
All spelling mistakes are the responsibilty of the reader (Rick Renz, STK, ca. 1994)
==============================
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On Sep 19, 2024, at 19:53, Harvey White via groups.io <madyn@...> wrote:
?Unless you like VHDL...... <grin>
Harvey
On 9/19/2024 5:29 PM, Dave Daniel wrote:
Add in SystemVerilog if one is contemplating FPGA/ASIC work.
DaveD
KC0WJN
Thanks for all the fish.
==============================
All spelling mistakes are the responsibilty of the reader (Rick Renz, STK, ca. 1994)
==============================
On Sep 19, 2024, at 16:03, Roy Thistle via groups.io <roy.thistle@...> wrote: ?
On Thu, Sep 19, 2024 at 09:11 AM, Frank Mashockie wrote: I've been considering going into an online master's program for EE.
If your boss is not paying for it... It's expensive.
2 to 3 years to complete, on average.
Say 50,000USD total cost, on average... and up... for many good US schools.
Georgia Tech is... about the lowest cost... 10,000USD total cost.
Everyone is different... but IMO... the average person... depending on which specialty they want... needs to have a strong background in
calculus... as in vector, complex, and differential equations... linear algebra... numerical methods... statistics.
Computer science skills are required too.
Programming in Python or C
Simulations in software packages like Pspice
HDL like Verilog, or VHDL
Not to mention a strong background in
circuit analysis
devices
probably other stuff I forgot too.
|
Re: HP 339A Distortion Test Set repair/refurbish (hamfest find) (long read)
In message < [email protected]>, Paul Bicknell <admin@...> writes Hi Tony what Distortion level did you manage to get the 339 down to ? also
what is the level flatness you have managed to achieve between say 75 hz to
20 Khz ?
It was just that Flat!, and IIRC it was around .001% some of course was just noise.. -----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of tony sayer
Sent: 09 September 2024 11:28
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 339A Distortion Test Set
repair/refurbish (hamfest find) (long read)
In message <[email protected]>, Jim via groups.io
<james_buttons@...> writes
Thanks Dave.
?
I'll look into that next. During my initial testing I did look at
the freq. output of the oscillator and I didn't see anything that
looked outrageous re: actual vs. setting, but I didn't run the math
to see if in spec. I the cases where the input LED was on,
sometimes the oscillator freq was spot on and other frequencies
where the LED was on freqs. seemed off from spec, but not too far
off. I think it may be a little bit of both - notch filter center
freq. being off in some cases, oscillator freq. off in others.
?
I looked through the schematic at the section for the monitor
output and it's a simple path from the main meter circuitry (which
appears to be working) - just a resistor, fuse and then the
isolation relay. I hear the relay get activated/deactivated, so
once I have the unit open again I will probe that path and see
where the signal stops. I am hoping that it's just the 0.062A fuse.
?
?
I am going to let the unit "bake" for a week or so. After 24 hours
the freq. that starts requiring the vernier is now down from 3.5
KHz to 3.3 KHz.
?
Did I read somewhere where HP did not include the schematic for the
339A's oscillator itself in the service manual?
? I think it is there are some versions for this unit online here and there
had one for years very reliable;!
Whilst your at it make sure of you change the power supply caps this
improved the distortion reading on mine by a decent amount supply ripple i
suppose?>.
--
Tony Sayer
-- Tony Sayer Bancom Communications U.K. Tel+44 1223 566577 Mob: 07707799230 4 Wingate close, Cambridge, England, CB2 9HW E-Mail tony@...
|
On the first system in my professional life, Emacs was written in Lisp and
ran on Multics (the system that the Unix pun came from). When we moved to
Unix on a Dec Alpha there were insufficient resources for the user base to use
something that large, so I added a number of features to a version of
"microemacs" that was floating around to make it actually usable.
I still use that version, it's pretty much ingrained into my fingers after
40 years. I think the last time I compiled it was 20 years ago. Also, programs
like rlwrap can add emacs edit keystrokes and history features to almost any
command driven software. Probably 2-4X the productivity of the point and
click model.
Paul
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On Fri, Sep 20, 2024 at 08:53:52AM -0400, Dave McGuire wrote:
Was, but no longer?
Though the "editor wars" are fun, I actually use both vi and emacs
regularly. I'm going to make a quick edit /etc/resolv.conf, I use vi. If
I'm sitting down for a ten-hour coding session, I use emacs.
-Dave
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows
|
You're welcome.? I can take a design from concept to hardware to pc board to build and then do the same for software.? Limitations, of course.
I always encouraged my students to learn both hardware and software, even if they were not going to use it immediately (either!).
I have a program written in C++ (on the PC) that parses an EAGLE board file, then produces an OpenSCAD file (will need custom OpenSCAD parts) to model the board.? Makes it useful for designing cases and assemblies as well as getting an idea of what fits where.
So current languages?? embedded C, C++ for microprocessors, C++ for the PC, VHDL for FPGAs, OpenSCAD for 3D designs.
I have mostly dropped Delphi, which can be somewhat annoying to code in.? Not a bad language (Pascal), but gives me no transportability to the microprocessor realm.
I do mostly digital and power supply design (in support), with a reasonably heavy concentration in microprocessors.
Harvey
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On 9/20/2024 9:27 AM, Frank Mashockie wrote: Thanks Harvey!
I really appreciate the feedback.? The software is definitely my weakest point.? I think it might be a good idea to start introducing myself to some of it.? I've gotten familiar with programming development software to flash MCUs, but that is about it.
I love repair of PCBs.? The problem solving and troubleshooting.? Learning more about different types of circuits.? With that, I think I'd like to get into PCB design. Definitely hardware related.? But I guess I won't know for sure until I get into that degree - there's still so much I need/want to learn.? I am also interested by power systems and the grid. I probably would have been a lineman if I wasn't afraid heights!
Sorry I don't mean to derail the thread, but I greatly appreciate the feedback!
-Frank
|
Thanks Harvey!?
?
I really appreciate the feedback.? The software is definitely my weakest point.? I think it might be a good idea to start introducing myself to some of it.? I've gotten familiar with programming development software to flash MCUs, but that is about it.?
?
I love repair of PCBs.? The problem solving and troubleshooting.? Learning more about different types of circuits.? With that, I think I'd like to get into PCB design.? Definitely hardware related.? But I guess I won't know for sure until I get into that degree - there's still so much I need/want to learn.? I am also interested by power systems and the grid.? I probably would have been a lineman if I wasn't afraid heights!??
?
Sorry I don't mean to derail the thread, but I greatly appreciate the feedback!
?
-Frank
|
When I left the world of UNIX (actually "CLIX" for our product), I travelled to the dark side and use notepad, etc., now. I do miss the vi days. So much one can do without ever taking one's hands off of the keyboard.
Barry - N4BUQ
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Show quoted text
Was, but no longer?
Though the "editor wars" are fun, I actually use both vi and emacs
regularly. I'm going to make a quick edit /etc/resolv.conf, I use vi.
If I'm sitting down for a ten-hour coding session, I use emacs.
-Dave
On 9/20/24 08:26, n4buq wrote:
I was a vi man myself.
Barry - N4BUQ
'Twas a joke. But emacs has to be one of the most widely-ported pieces of
software in history.
-Dave
On September 19, 2024 8:23:47 PM "Harvey White" <madyn@...> wrote:
Never used it, so... wasn't available for what I was doing.
Harvey
On 9/19/2024 7:57 PM, Dave McGuire wrote:
Emacs!
On 9/19/24 19:53, Harvey White wrote:
Unless you like VHDL...... <grin>
Harvey
On 9/19/2024 5:29 PM, Dave Daniel wrote:
Add in SystemVerilog if one is contemplating FPGA/ASIC work.
DaveD
KC0WJN
Thanks for all the fish.
==============================
All spelling mistakes are the responsibilty of the reader (Rick
Renz, STK, ca. 1994)
==============================
On Sep 19, 2024, at 16:03, Roy Thistle via groups.io
<roy.thistle@...> wrote:
?
On Thu, Sep 19, 2024 at 09:11 AM, Frank Mashockie wrote:
I've been considering going into an online master's program for
EE.
If your boss is not paying for it... It's expensive.
2 to 3 years to complete, on average.
Say 50,000USD total cost, on average... and up... for many good US
schools.
Georgia Tech is... about the lowest cost... 10,000USD total cost.
Everyone is different... but IMO... the average person... depending
on which specialty they want... needs to have a strong background in
calculus... as in vector, complex, and differential equations...
linear algebra... numerical methods... statistics.
Computer science skills are required too.
Programming in Python or C
Simulations in software packages like Pspice
HDL like Verilog, or VHDL
Not to mention a strong background in
circuit analysis
devices
probably other stuff I forgot too.
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Oh I'd love to hear the story behind that one!
-Dave
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Show quoted text
On 9/20/24 09:07, David Holland wrote: You forgot one:
If I want to cause a production outage, I use pico...
(yes, that actually happened somewhere....)
On Fri, Sep 20, 2024 at 8:53?AM Dave McGuire via groups.io
<mcguire@...> wrote:
Was, but no longer?
Though the "editor wars" are fun, I actually use both vi and emacs
regularly. I'm going to make a quick edit /etc/resolv.conf, I use vi.
If I'm sitting down for a ten-hour coding session, I use emacs.
-Dave
On 9/20/24 08:26, n4buq wrote:
I was a vi man myself.
Barry - N4BUQ
'Twas a joke. But emacs has to be one of the most widely-ported pieces of
software in history.
-Dave
On September 19, 2024 8:23:47 PM "Harvey White" <madyn@...> wrote:
Never used it, so... wasn't available for what I was doing.
Harvey
On 9/19/2024 7:57 PM, Dave McGuire wrote:
Emacs!
On 9/19/24 19:53, Harvey White wrote:
Unless you like VHDL...... <grin>
Harvey
On 9/19/2024 5:29 PM, Dave Daniel wrote:
Add in SystemVerilog if one is contemplating FPGA/ASIC work.
DaveD
KC0WJN
Thanks for all the fish.
==============================
All spelling mistakes are the responsibilty of the reader (Rick
Renz, STK, ca. 1994)
==============================
On Sep 19, 2024, at 16:03, Roy Thistle via groups.io
<roy.thistle@...> wrote:
?
On Thu, Sep 19, 2024 at 09:11 AM, Frank Mashockie wrote:
I've been considering going into an online master's program for
EE.
If your boss is not paying for it... It's expensive.
2 to 3 years to complete, on average.
Say 50,000USD total cost, on average... and up... for many good US
schools.
Georgia Tech is... about the lowest cost... 10,000USD total cost.
Everyone is different... but IMO... the average person... depending
on which specialty they want... needs to have a strong background in
calculus... as in vector, complex, and differential equations...
linear algebra... numerical methods... statistics.
Computer science skills are required too.
Programming in Python or C
Simulations in software packages like Pspice
HDL like Verilog, or VHDL
Not to mention a strong background in
circuit analysis
devices
probably other stuff I forgot too.
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
|
You forgot one: If I want to cause a production outage, I use pico... (yes, that actually happened somewhere....) On Fri, Sep 20, 2024 at 8:53?AM Dave McGuire via groups.io <mcguire@...> wrote:
Was, but no longer?
Though the "editor wars" are fun, I actually use both vi and emacs
regularly. I'm going to make a quick edit /etc/resolv.conf, I use vi.
If I'm sitting down for a ten-hour coding session, I use emacs.
-Dave
On 9/20/24 08:26, n4buq wrote:
I was a vi man myself.
Barry - N4BUQ
'Twas a joke. But emacs has to be one of the most widely-ported pieces of
software in history.
-Dave
On September 19, 2024 8:23:47 PM "Harvey White" <madyn@...> wrote:
Never used it, so... wasn't available for what I was doing.
Harvey
On 9/19/2024 7:57 PM, Dave McGuire wrote:
Emacs!
On 9/19/24 19:53, Harvey White wrote:
Unless you like VHDL...... <grin>
Harvey
On 9/19/2024 5:29 PM, Dave Daniel wrote:
Add in SystemVerilog if one is contemplating FPGA/ASIC work.
DaveD
KC0WJN
Thanks for all the fish.
==============================
All spelling mistakes are the responsibilty of the reader (Rick
Renz, STK, ca. 1994)
==============================
On Sep 19, 2024, at 16:03, Roy Thistle via groups.io
<roy.thistle@...> wrote:
?
On Thu, Sep 19, 2024 at 09:11 AM, Frank Mashockie wrote:
I've been considering going into an online master's program for
EE.
If your boss is not paying for it... It's expensive.
2 to 3 years to complete, on average.
Say 50,000USD total cost, on average... and up... for many good US
schools.
Georgia Tech is... about the lowest cost... 10,000USD total cost.
Everyone is different... but IMO... the average person... depending
on which specialty they want... needs to have a strong background in
calculus... as in vector, complex, and differential equations...
linear algebra... numerical methods... statistics.
Computer science skills are required too.
Programming in Python or C
Simulations in software packages like Pspice
HDL like Verilog, or VHDL
Not to mention a strong background in
circuit analysis
devices
probably other stuff I forgot too.
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Was, but no longer?
Though the "editor wars" are fun, I actually use both vi and emacs regularly. I'm going to make a quick edit /etc/resolv.conf, I use vi. If I'm sitting down for a ten-hour coding session, I use emacs.
-Dave
toggle quoted message
Show quoted text
On 9/20/24 08:26, n4buq wrote: I was a vi man myself.
Barry - N4BUQ
'Twas a joke. But emacs has to be one of the most widely-ported pieces of
software in history.
-Dave
On September 19, 2024 8:23:47 PM "Harvey White" <madyn@...> wrote:
Never used it, so... wasn't available for what I was doing.
Harvey
On 9/19/2024 7:57 PM, Dave McGuire wrote:
Emacs!
On 9/19/24 19:53, Harvey White wrote:
Unless you like VHDL...... <grin>
Harvey
On 9/19/2024 5:29 PM, Dave Daniel wrote:
Add in SystemVerilog if one is contemplating FPGA/ASIC work.
DaveD
KC0WJN
Thanks for all the fish.
==============================
All spelling mistakes are the responsibilty of the reader (Rick
Renz, STK, ca. 1994)
==============================
On Sep 19, 2024, at 16:03, Roy Thistle via groups.io
<roy.thistle@...> wrote:
?
On Thu, Sep 19, 2024 at 09:11 AM, Frank Mashockie wrote:
I've been considering going into an online master's program for
EE.
If your boss is not paying for it... It's expensive.
2 to 3 years to complete, on average.
Say 50,000USD total cost, on average... and up... for many good US
schools.
Georgia Tech is... about the lowest cost... 10,000USD total cost.
Everyone is different... but IMO... the average person... depending
on which specialty they want... needs to have a strong background in
calculus... as in vector, complex, and differential equations...
linear algebra... numerical methods... statistics.
Computer science skills are required too.
Programming in Python or C
Simulations in software packages like Pspice
HDL like Verilog, or VHDL
Not to mention a strong background in
circuit analysis
devices
probably other stuff I forgot too.
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
|
On Fri, Sep 20, 2024 at 03:10 AM, Pete Harrison wrote:
At the moment theres an HP8640 Undergoing surgery, no freq display, but i havnt delved in yet.
Pete, is the display blank, or just reading 0?
?
If it is reading 0, first check that the toggle switch on the back panel of the 8640B is set to use the internal frequency reference, not an external reference.
?
- Jeff, k6jca
|
I was a vi man myself.
Barry - N4BUQ
toggle quoted message
Show quoted text
'Twas a joke. But emacs has to be one of the most widely-ported pieces of
software in history.
-Dave
On September 19, 2024 8:23:47 PM "Harvey White" <madyn@...> wrote:
Never used it, so... wasn't available for what I was doing.
Harvey
On 9/19/2024 7:57 PM, Dave McGuire wrote:
Emacs!
On 9/19/24 19:53, Harvey White wrote:
Unless you like VHDL...... <grin>
Harvey
On 9/19/2024 5:29 PM, Dave Daniel wrote:
Add in SystemVerilog if one is contemplating FPGA/ASIC work.
DaveD
KC0WJN
Thanks for all the fish.
==============================
All spelling mistakes are the responsibilty of the reader (Rick
Renz, STK, ca. 1994)
==============================
On Sep 19, 2024, at 16:03, Roy Thistle via groups.io
<roy.thistle@...> wrote:
?
On Thu, Sep 19, 2024 at 09:11 AM, Frank Mashockie wrote:
I've been considering going into an online master's program for
EE.
If your boss is not paying for it... It's expensive.
2 to 3 years to complete, on average.
Say 50,000USD total cost, on average... and up... for many good US
schools.
Georgia Tech is... about the lowest cost... 10,000USD total cost.
Everyone is different... but IMO... the average person... depending
on which specialty they want... needs to have a strong background in
calculus... as in vector, complex, and differential equations...
linear algebra... numerical methods... statistics.
Computer science skills are required too.
Programming in Python or C
Simulations in software packages like Pspice
HDL like Verilog, or VHDL
Not to mention a strong background in
circuit analysis
devices
probably other stuff I forgot too.
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Hi everyone. My main sphere of work is RF systems Test at my place of work. The home Lab is used for allsorts, having recently moved properties its currently in a state of disorganisation, but i have put a bench together. To the right is my desk and to the left of the HP instruments on a trolley is a Large tool cabinet full of handtools and test accessories. At the moment theres an HP8640 Undergoing surgery, no freq display, but i havnt delved in yet. Anyway heres the bench as it looks right now. 
|
Re: Probing deep and/or narrow into a given unit for troubleshooting
On 2024-09-19 23:34, Radu Bogdan Dicher wrote:
Hi all,
I was wondering of asking for thoughts and ideas on probing
deep into some units, or maybe just through a narrow clearance.
What I'm thinking of is primarily for use with a DMM (vanilla
troubleshooting), though maybe scope probes and others could be
considered. But the latter is not my priority.?
?
I have a variety of probes, from "witches hats," to "spring
hooks" to many others I don't really even know how to call. I
got a bunch and I'll never get tired to look for more and
diverse ones. I absolutely think there's never enough tools for
probing at a bench. My "silver bullet" is this: ,
but even this is far too large for some low clearance
situations. But its length allows me to reach depths nothing
else I have here comes close. Everything else is up to about 3"
reach.?
?
Sometimes it comes down to having extender cards, or made
ejecting a card, attaching (including soldering) a wire and then
probing it once the card is back in there. But that's not always
possible. Especially with microwave or mm modules, I am weary of
disturbing them too much, and there's always more mechanical
aspects to messing with them.?
?
What are some creative and crafty solutions others have found
useful? Maybe some miraculous tools you've found??
?
Thank you,
Radu.?
I had a NAND flash overwrite problem in one of my designs some 10
years ago. Mostly BGA chips, so lots of via's.
A connection was needed to the TEK logic analyzer cables.
See the solution below. Wire is transformer wire, isolation melts at
the soldering iron tip.
The bottom row (GND pins) was soldered to the GND plane.
After a few days of waiting for the bad write it was found to be a
pointer problem caused by a 3rd party library.
Arie
|
The Metcal units, at least the two Mx500 I have in my shack, have a conventional transformer. No toroid, no SMPSU. The extruded aluminium housing does not shield the stray magnetic field.
Another fun thing is that some 13.5 MHz RF gets leaked by their cables. Can be fun if you wonder were that QRM comes from..
Other than that: brilliant kit those Metcal.
Wilko
|
Re: Free to good home, HP 5423A system + manuals and spares
On 9/19/24 15:29, Rik Bos wrote: Some info:
I have working copies of the firmware tapes and can duplicate them to 3M QIC80 tapes.
With some minor modification you can let the 5423/5420 system work with QIC80 tapes.
The systems are build around a HP 1000 M-processor with 48/64/128kW memory installed.
Every time you cold start the system it will load it's OS / Firmware from tape, with the original HP tapes that won't work anymore.
That's why I modified my system and copied the firmware tapes to QIC80 tapes, in my case 3M DC2120.
If you need a working copy of this let me know. Hi Rik, yes, I would like to have copies, thank you. I was aware of the HP-1000 in the box; that's one of the reasons I'm interested in these. I would like to perform the QIC80 conversion on this unit. Someone did quite a lot of work on these several years ago; I can't find the web page offhand right now, was that you? -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Re: Transferring waveforms from 54542a through GPIB
To solve the re=trigger problem, I put my scope in SINGLE sweep mode, that way, the scope does not lose the captured image that you want.
You don't say what operating system that you are running on your PC. I have a command line tool set that I wrote to control the scope and download all active channels to a .CSV file for postprocessing. The tool is written for Linux, but it can be compiled to run under Windows, with some effort.
The Linux version uses the open source linux-gpib package to deal with the interface. That package works with a number of GPIB interface boards.
Source code and build instructions can be found at:
The windows version uses NI libraries and assumes an NI GPIB interface. There is one Windows file that is needed, but I don't include it because it is copywrited by Microsoft.
I write this tool to use my 54542A as a data acquisition system for another project that I was working on.
|
On 9/19/24 21:59, Harvey White wrote: With the Linux heritage, IIRC. Oh good heavens no; emacs is way older than that, and it did not originate in the UNIX world. It dates back to the mid-1970s, on DEC PDP-10s. It has been ported to, or implemented on, every interactive OS on every platform that I can think of, including every functional implementation of UNIX. ?I did (and do) a lot of IDEs, unlike people who have a separate editor, separate compiler, and a makefile (I did something like that on a DG Nova computer, it's what the company had.) I don't use IDEs as most people think of them. But when developing software (mostly firmware), I never have to leave the emacs window(s). Editing, compiling, target programming. That by definition is an "IDE", but it's not what most people think of when they say "IDE". So I know of it, but never used it in its native form.? Perhaps some other editors were derived from it, but what I did?? Not that I'd know of. You'd know. ;) Dozens of editors were derived from it, some free, some commercial. But you'd definitely know. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Frank Mashockie
Dave McGuire
Arie de Muijnck