Re: HP 6012B power supply (1000W switcher)
Martin:
Interesting. Definite birdies , if I am reading you rcvr correctly.
All the way up to 4 MHz? Wow!
Now you can play with your near field probes and find out where it is coming from maybe.
Thank You
Chuck: sounds like a good idea. Better than my O scope probe!
Wally
|
Same as my 8640B and SM 08640-90186 covering S/N 1609A through?1802A?from April?'78 and change sheets covering?1810A through?2031A from June '80.
I've heard it called three phase but a closer look shows it is really four phase. ?If mine ever goes, I'll put in a 12VDC fan?on?LM317 wired between +10 and -5.2 similar to late production.
Dave Wise
08640-90215 covers S/N 2520A through 2923A (May '91).
08640-90017 covers S/N 1229A through 1324A (Jan '74).
Does anyone have manuals covering the gaps?
toggle quoted message
Show quoted text
Here's the circuit in my 8640A (yes, -A) SM 08640-90114 covering S/N 1602A and 1624U from October '76.
Raymond
|
Here's the circuit in my 8640A (yes, -A) SM 08640-90114 covering S/N 1602A and 1624U from October '76.
Raymond
|
Dear Group - Has anyone any experience obtaining and installing Option ? Looking to Install Option 1D2 Sweep Sine Measurements and has any member got this ?
??????? Regards Marc
|
Re: HP 6012B power supply (1000W switcher)
I made a quick-and-dirty check, with my test receiver sitting on the shelf atop the power supply and connected to 1m of strand wire as an Antenna. The power supply does not have the top and bottom cover, only internal shielding. I also did not connect the EMI-Filter on the supply side since I want to replace the Rifa's first.?
The receiver is tuned to 100kHz. When I switch on the PS I see nothing.? But when I do this:
I get this: the peaks are spaced by 20kHz (cats and dogs won't love this), and I can see them up to approx. 4MHz.? Once the EMI is back and the covers on I'll check again.
|
Re: HP 6614C Power Supply with Err12
There may be a pull up that has opened. Try adding a 5k resistor from /CS to high logic level (5V or 3.3V depending on what’s used in your PS). After you add that pull up, at least the following outcomes are possible:
1. It starts working - in that case there was a pull-up on the board but it went open.
2. /CS gets stuck high - then either the connection to the FPGA is open, or the FPGA pin driver has died, or there is some logic that keeps the drive enable signal to the pin driver low.
3. Nothing changes - then either the /CS is shorted to GND on the PCB, or the FPGA pin driver is dead, or some logic that generates the CS signal is missing an input somewhere that would “unstuck” it.?
The above assumes that /CS is indeed meant to be driven by the FPGA. If that’s not the case then you’ll have to do more figuring out.
I hope this helps. Cheers, Kuba Sunderland-Ober
toggle quoted message
Show quoted text
14 okt. 2020 kl. 4:21 fm skrev michaelschenk72 <michaelschenk72@...>:
?Dear community,
I've acquired a HP 6614C power supply (100V/0.5A) from a local auction showing Err12 on self test. The power supply was cheap so I agree on "challenge accepted".
From service manual
Err12
12 bit DAC test failed, 4095 is written to DAC U241Aand 0 to B, ADC U242 is checked for 71 +/- 7 counts
This DAC (a? MAX532BCWE) is responsible for setting the voltage and current. I lifted the CV_PROG and CC_PROG and inject the voltage manually (0..-4.8V) and then the power supply works
as expected. So I guessed that the DAC was faulty and I exchange the DAC.? Sadly to say that the issue is still there after replacing the MAX532BCWE.
SPI CLK and Data to MAX532BCWE are looking good but the /CS signal is always low. This means the DAC will never took the new values, For that the /CS signal needs to have a transition from low to high for a given time.
If I poked around on the MAX532BCWE /CS pin it looks like I can trigger a valid /CS impulse and the DAC is taking the delivered values and apply the correct CV_PROG and CC_PROG on it's output.
The SPI lines are routed to a FPGA on the same board A2. Sadly to say that for this kind of power supply no detailed schematics are available.
Did anyone have a detailed schematic or knows how the SPI is routed from MAX532BCWE to the FPGA ?
Any ideas why my /CS is always low ?
Many thank in advance and best regards
Michael
|
Re: HP 6012B power supply (1000W switcher)
A nice simple near field probe can be made quite easily.
I took a piece of 141 semi rigid coax, and fit a SMA male
to one end, and trimmed the other end for an SMA male, but
did not install a connector. I then made a small coil by
winding 5T of enamel wire using the threads of a 6-32
screw as a form. I removed the screw, and soldered the
coil to the trimmed end of the 141 coax... with the coil
fit over the center insulation, and soldered one end to
the shield, and the other to the center pin.
A piece of heat shrink, and you are done.
You use an appropriate adapter or cable, and connect the
probe to a 50 ohm input... a scope, SA, whatever...
The flux sensitivity is along the length of the coil,
so you can tell easily how the measured signal is oriented
by the direction the probe is pointing.
-Chuck Harris
Carsten Bormann wrote:
toggle quoted message
Show quoted text
On 2020-10-14, at 16:04, wallydoc via groups.io <wallydoc@...> wrote:
Strongest birdie signals on SA were obtained with a sniffer, an O scope probe with the ground connected to the tip and put near the SMPS.
… which is pretty much a poor man’s near-field probe.
(The reason why you might want a real one is to locate the source of the signal more precisely or to get a quantitative result.)
Grü?e, Carsten
|
Re: HP 6012B power supply (1000W switcher)
On 2020-10-14, at 16:04, wallydoc via groups.io <wallydoc@...> wrote:
Strongest birdie signals on SA were obtained with a sniffer, an O scope probe with the ground connected to the tip and put near the SMPS.
… which is pretty much a poor man’s near-field probe. (The reason why you might want a real one is to locate the source of the signal more precisely or to get a quantitative result.) Grü?e, Carsten
|
Re: HP 6012B power supply (1000W switcher)
Martin
First of all thanks for your post
Just with an antenna, I think, maybe a spectrum analyzer or just a radio tuned to 20 meter band.?
Other bands maybe, but I had the most problems with repeating birdies every 100 KHz or so? especially in 20 Meters. Radios were connected to regular Ham? antenna
My birdies would affect all other radios in the room, not just the radio being supplied by the SMPS.
Strongest birdie signals on SA were obtained with a sniffer, an O scope probe with the ground connected to the tip and put near the SMPS.
Wally
|
Re: HP HIL keyboard and mouse wanted - in Australia
Hello, I have HIL Keyboards (46020A and 46021A and mice (2 button and 3 button? 46060A/B) as well as other HIL peripherals and parts for HP instruments.? I will be posting a major announcement on this within the next 7 days. I am willing to sell at reasonable prices to those in these forums and only charge actual shipping with no handling fees etc. If interested, post here or Email me at? ghnatiuk@...Thanks, George Hnatiuk
|
Re: HP 6012B power supply (1000W switcher)
Hello Wally,
I'm not an EMI expert, so: how do you want me to measure RF noise?
- at the outputs?
- with an antenna?
- in what frequency range?
- under what load conditions?
I have an SA up to 22GHz and a test receiver up to 3GHz. I also have a couple of near-field measurement probes that I got with the test receiver but which I do NOT know how to use - but I'd love to put them to use. So feel free to instruct me!
:-)
cheers
Martin
|
Re: HP 6012B power supply (1000W switcher)
Just for future reference, in case I find a PS like yours...how is the RF noise from the switching PS?
I am using an HP 6268B (BIG BERTHA!) at present because the various other switching PS I used had lots of RF noise.
I had to rebuild the 6268 because all the diodes on the board were turned to grey dust, lots of other parts blown also.
?
Wally
|
HP 6012B power supply (1000W switcher)
Hi all, I got this supply for free, and - man! -? what a fine piece of equipment that is! I've had many power supplies, but this one beats them all when it comes to effortless melting of lab cables. Since the unit was functionally OK (although it had a red sticker on it) but extremly dirty inside I decided to take it apart for cleaning and share some pics. /g/HP-Agilent-Keysight-equipment/album?id=255049I have more pics, and in hires, if anybody is interested. These HP chassis are quite a pleasure to work with. Very straightforward, no obscure srews or breaking plastics. I find it interesting they used these 64-pin computer-sockets for the power modules. Seems to be reliable. There are some Rifas in the entry and output filter and one on the main board that I replaced. I had a smoking one in a Tek scope some weeks ago. Only annoying thing is the noisy fan. I wanted to put a temperature controlled one inside, but these are DC fans so I need to tap into the 15V supply. Finally I just swapped the original 110V Papst against an identical 220V. Now its nearly silent but still has a decent airflow, and I did not find any means to heat it up. With 500W on the outputs it consumes 580W, so just 80W to blow outside. I made a wire glow at 2V / 50A, that gave me 200W total consumption for roughly 100W at the outputs. When idling it consumes 40W, the largest part due to the bleeding resistors of the filter bank. Typical HP...? See my first topic on the 8645A ;-) cheers Martin
|
HP 6614C Power Supply with Err12
Dear community,
I've acquired a HP 6614C power supply (100V/0.5A) from a local auction showing Err12 on self test. The power supply was cheap so I agree on "challenge accepted".
From service manual
Err12
12 bit DAC test failed, 4095 is written to DAC U241Aand 0 to B, ADC U242 is checked for 71 +/- 7 counts
This DAC (a? MAX532BCWE) is responsible for setting the voltage and current. I lifted the CV_PROG and CC_PROG and inject the voltage manually (0..-4.8V) and then the power supply works
as expected. So I guessed that the DAC was faulty and I exchange the DAC.? Sadly to say that the issue is still there after replacing the MAX532BCWE.
SPI CLK and Data to MAX532BCWE are looking good but the /CS signal is always low. This means the DAC will never took the new values, For that the /CS signal needs to have a transition from low to high for a given time.
If I poked around on the MAX532BCWE /CS pin it looks like I can trigger a valid /CS impulse and the DAC is taking the delivered values and apply the correct CV_PROG and CC_PROG on it's output.
The SPI lines are routed to a FPGA on the same board A2. Sadly to say that for this kind of power supply no detailed schematics are available.
Did anyone have a detailed schematic or knows how the SPI is routed from MAX532BCWE to the FPGA ?
Any ideas why my /CS is always low ?
Many thank in advance and best regards
Michael
|
A picture of the PCB can be found here;
Jos PA0AMX
|
Re: HP-3456A - Question Regarding Resistance Measurement
Barry,
I am currently inventorying the resistors and other voltmeter parts etc. and should be done by Monday.? ?I will be making an announcement on these pages soon for all who are interested in the Red Devils and other parts previously inquired about.? ?I have everything so far requested over the past 6 months.
George
|
Re: UNIX files and dd, Re: [HP-Agilent-Keysight-equipment] Agilent 54831M
Hi, Dave.
You "mini-tutorial" on UNIX is much appreciated! I've dabbled a bit in that world (just enough to get myself into real trouble!).
For sure the Linux version of fdisk is light years ahead of that lame DOS fdisk! The Linux fdisk "knows" all the partitions out there; this one is FAT32, this one is NTFS, etc. The dumb DOS one just says Duh, there's something else out there, but I don't have a clue what its format is. Not to mention that every time you touch it, DOS fdisk goes and checks the hard drive! Maybe back when hdds only held 10 MB that was OK, but in the TB era, it takes a huge amount of time unnecessarily. You just checked it 10 seconds ago!
So a few years ago a friend told me about wubi, an installer for the Ubuntu distribution of Linux that runs turn-key on Windows systems.
Ubuntu had the GUI to make it Windows-user-friendly, and indeed, it was a snap to install, it made it a no-brainer to have a dual-boot system, and all was well. I used the thunderbird email client; I wasn't a big fan of thunderbird, but it did work well enough. But then one day my computer refused to boot to Linux. I looked for wubi online, but it was gone, and I don't remember all the details, but I think there was a .iso in it's place, and I never could figure out what to do with that. So I gave up and went back to Windows. For my purposes it works. Maybe some day I will go back to Linux, but I'd need a lot of time on my hands to ascend the learning curve.
I think of computers sort of like I think of cars and trucks. Just another tool that I'd just as soon not have to know how it works. Some people like to know all about them and get "under the hood" so to speak. Not me, I'm an analog/RF/microwave guy who would rather spend his time digging into radios and test equipment. To each his own.
Jim Ford
toggle quoted message
Show quoted text
------ Original Message ------ From: "Dave McGuire" <mcguire@...> To: [email protected]Sent: 10/12/2020 9:06:44 PM Subject: UNIX files and dd, Re: [HP-Agilent-Keysight-equipment] Agilent 54831M On 10/12/20 11:12 PM, Bostonman wrote:
I apologize ahead of time, but I lack experience with Linux, so these commands are confusing me.
The file was downloaded as a .zip, but it contains a file with the extension of .dd. Any 'dd' commands I find seem geared towards using a .iso file to make a bootable drive.
Currently I'm using a Raspberry Pi with a SSD drive connected through a USB adapter.
I looked at the link above, but it doesn't make sense to me. One article stated I need to set the block size, and others have extensively long command lines.
So I remain baffled at how to handle this. First, it's important not to overcomplicate things. From your statements I assume you're coming from the Windows world. In the Windows world, it's common to have one or more programs designed to accomplish a specific task and those programs store data in closed, proprietary formats, creating files that will only work with that specific program. If you've got a dozen programs that all accomplish the same task, they'll each use their own format.
The UNIX world is much, much simpler than that. Sure, locked-in file formats do exist, but they are not the norm with common UNIX utilities.
The "dd" program does not have a file format. It copies bytes from one place to another. If you tell it to move bytes from a hard disk drive (not a FILE on a hard disk drive, but from the drive itself), and put them into a file on another hard disk drive, the resultant file will contain a byte-for-byte copy of whatever was on the source hard disk. This is commonly referred to as a "disk image".
The .ISO file format is poorly-named and largely misunderstood. There is no such thing as "an ISO file". ISO refers to the ISO-9660 file format, which is an on-disk filesystem layout intended for use with optical media. There are many such filesystems, but ISO-9660 is very common on optical media. When you make a disk image file (see paragraph above) of a CD-ROM drive, that would be considered to "be an ISO"...whether that CD-ROM originally contained an ISO-9660 filesystem or not. This is typical American terminological laziness at work, and it leads to confusion.
Next, file naming...Another important thing to understand about the UNIX world is that file extensions have no meaning to the system, only to humans. Windows makes a lot of assumptions about the contents of a file based on its extension, but in a UNIX-based OS, there's nothing special about the "." character, and there's nothing special about what may or may not come after it in a filename. Someone having called your file "<filename>.dd" means nothing to the system, and is not used by the system in any way, but it gives me (and soon, you) a clue as to how the file was created if the guy you got it from didn't tell you.
It would be useful for you to learn what the "dd" program does and what it's all about. If you understood it, you would see the "instructions" you found online and immediately see how they would apply to your situation, although they were (poorly) written to focus on "ISOs" of CD-ROM disks. The "dd" program copies bytes between sources and destinations. Sources and destinations can be hard disk drives, CD-ROM drives, floppies, USB thumb drives, files on a disk...anything.
The "dd" program has a lot of options to manipulate data in different ways. Sometimes the block size is important, but a lot of the time it isn't. Most of the time (but not all) it just tells dd to "read or write the data in chunks this big". For some types of devices it's important, for most it isn't, and for files on a drive it means nothing at all...EXCEPT things generally go a whole lot slower if you use a block size of 1 byte, which is the default unless you tell dd otherwise.
I realize learning this is actual work, but this is a give a man a fish/teach a man to fish situation. If you do any amount of "real" computing, you will use this information over and over again. The whole world works this way. The important thing to keep in mind is that UNIX is nothing at all like Windows...do not make any assumptions based on your Windows experience.
-Dave
-- Dave McGuire, AK4HZ
New Kensington, PA
|
Re: Clearing out some stuff. Series 200/300 monitors,umatic vid tape decks, printers
Yes I hate throwing stuff away that could have use somewhere, but need to clear it out, especially the bigger stuff for now.? Not sure if I have any SRM cards, but it's possible I could have almost anything.? I don't really have time right now to do every little thing justice, but maybe later.
|
Re: Clearing out some stuff. Series 200/300 monitors,umatic vid tape decks, printers
David,
??? I tried to send you a private email. Would you please contact me
at: mechanic_2@... ?
GOD Bless and Thanks,
rich!
On 10/13/2020 6:34 PM, David B via
groups.io wrote:
toggle quoted message
Show quoted text
Had a lot of inquiries for the 200/300 computers,? but
right now I don't have time to set those up.? I do want to move
out the bigger stuff.? The rack mount cabinet has a custom series
200/300 in it with small 9826 display with 80cal text mod.? So if
you want the rack cabinet you can get that with it.? Powers up,
worked last time I used it.? I would need to do some configuring
and checking to verify all is still good.? See photos here:?
No photos of the printers since all should know what they look
like.
Also photo added four old HP analog scopes.
|
Re: Clearing out some stuff. Series 200/300 monitors,umatic vid tape decks, printers
Had a lot of inquiries for the 200/300 computers,? but right now I don't have time to set those up.? I do want to move out the bigger stuff.? The rack mount cabinet has a custom series 200/300 in it with small 9826 display with 80cal text mod.? So if you want the rack cabinet you can get that with it.? Powers up, worked last time I used it.? I would need to do some configuring and checking to verify all is still good.? See photos here:?
No photos of the printers since all should know what they look like.
Also photo added four old HP analog scopes.
|
Martin
Jos Raven PA0AMX