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Re: making 50 ohm measurements with a 75-ohm s-parameter test set
bdunn246
Hi all-
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Thanks much for the feedback. In my original post, I neglected to mention I do plan to make 2-port measurements of amps, filters, etc. I guess it slipped my mind given how easy through calibration is! :-) For my planned antenna return loss measurements, I see your point, David, that 30 dB is probably excessive. Perhaps 25 dB +/- 3 dB is a more realistic goal. I wonder, at my target frequencies (up to 450 MHz), could i reach this goal if I built my own cal standards for open and short using N connectors? Thanks, Bryan --- In hp_agilent_equipment@..., Brooke Clarke <brooke@...> wrote:
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Re: HP 8640B Troubleshooting help needed
kn4hhptc
Frank, thank you for the suggestion. ?The -20volt regulator had failed. After replacement, the unit works very well.
Thanks again. 73, Bob, KN4HH Sent from Samsung tabletfrancesco messineo <francesco.messineo@...> wrote:As in almost all electronic troubleshooting, I'd start with checking all power supplies. good luck Frank? IZ8DWF On Wed, Feb 27, 2013 at 2:56 PM, kn4hhptc <kn4hhptc@...> wrote:
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Re: HP 1740A Parts wanted
Part numbers would help. I have some knobs NOS but I am not inclined to look up what goes on that scope.
Dennis From: raymonduk2000 <raymonduk2000@...> To: hp_agilent_equipment@... Sent: Friday, March 8, 2013 7:29 PM Subject: [hp_agilent_equipment] HP 1740A Parts wanted hello, been looking in the net for spares for HP1740A oscilloscope? (see picture for details) I wonder if you can help me find a knob ( cal ) ch1 [ 1 in picture] ,? and the (time) [ 2 in picture] in addition to front cover (this is to look after the CRT screen) sorry I do not know the exact part numbers. thank you ------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed] |
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HP 1740A Parts wanted
hello,
been looking in the net for spares for HP1740A oscilloscope (see picture for details) I wonder if you can help me find a knob ( cal ) ch1 [ 1 in picture] , and the (time) [ 2 in picture] in addition to front cover (this is to look after the CRT screen) sorry I do not know the exact part numbers. thank you |
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CRT Needed for HP 54520A Scope
Hi gang...I need to replace the CRT in two or three HP 54520A scopes. While the one's installed work, they are very well burnt and getting dim.
The tube is an HP 2090-0324 Hitachi Mizusawa J260194 9" P31 Green phosphor tube. If any one has a boneyard scope with a good CRT, I could use a few. Also, can use the trim strip that holds the case to the front bezel. Question: Would most 9" CRT's work with the existing video board? Any help or thoughts appreciated. Dan in Chandler AZ ===================================================== |
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Re: 8753D floppy disk convert to usb?
I have an 8753D with the standard TEAC FD-04 floppy drive. I decided to attempt to replace the floppy drive with an emulator that substituted the floppy disk with a USB memory stick (thumb drive, usb drive, etc).
I did some research (not enough obviously) and purchased a GOTEK slim line (0.5") emulator on ebay from a seller called "e2wholesale". Here is the 8753D upside down with the original floppy removed. Here is the model designation on the original floppy: In addition to the drive being "slimline" it also uses a 26 pin flat cable instead of the more common 34 pin IDC. Here is a picture showing the cable that is connected to the 8753D: And with the original drive removed: here is the new floppy emulator: And now a photo of the new floppy emulator connected but not yet in place: We took a USB drive and put it into the device. Then in the 8753D we went to the save/recall menu and changed to the "internal drive" here are the results: As you can see, it is reading the DOS files on the USB drive with great success! Then we attempted to "SAVE" from the 8753D onto the USB drive: And you can see in addition to the DOS files there is now "FILE00" ISTATE file. At this point I thought the project was complete and began to physically install the disk emulator. This was a little tricky because I had to loosen the front panel of the VNA to allow me to remove the metal carrier tray that the drive or emulator must attach to. Well, I thought the project was done, but in fact it doesn't really work very well. Allow me to explain. The first problem with this emulator is that it has a button that must be pressed to put the emulator in "WRITE" mode. If you don't do this before you attempt to save some data from the VNA, the data will write to the internal memory of the emulator but you will not be able to write it to the USB drive. This is annoying because it is hard to remember to push this button. The 8753D vector network analyzer performs in the following way¡ Information is stored on the floppy by using an incrementing filename. The user has little control over the filename. The floppy is read (catalog). If the floppy is empty, the first time you save your data it will be saved as "FILE00" and the second time you save the filename will be "FILE01" and so on. The way the device determines what the next number to use is by "reading" the floppy before writing the file. It will use (max+1) for the new filename. Now, here is the problem. Before I begin to save a new file, I press the left button (WRITE MODE). Then I initiate the SAVE function on the VNA. Well, the first thing it does is do a directory read (catalog) in order to determine the right file name to use. The problem is that while the USB emulator is in "write mode" it cannot be read. So a directory request (catalog as the 8753D calls it) will show NO files on the USB drive! Because of this, it will always write the file as FILE00 which overwrites the existing FILE00 file that was already on the USB drive. What is needed is that even during a WRITE mode, a read should be allowed to occur. If a read occurs during the write mode, it should be allowed to work. So Bottom Line: This kinda works. As long as you only care about storing one state file at a time for transferring to a PC, this will work fine (albeit cumbersome having to press the button before writing). If you want to store multiple states on the usb, you will have some trouble doing this, but again for transporting one file from the VNA to a PC it will work. Second issue is that deleting or renaming files does not seem to work. So I have ordered a different USB floppy emulator from another company which is more expensive, but I will try that out in about a month and report on my findings then. Regards Eugene W2HX |
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Re: Lamps and Mains Lead for HP412A?
Thanks for the tip, Cliff.
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They're not exactly like the HP ones, but they may well suffice... certainly worth a try at 36p each! 73, Mike M0MLM ----- Original Message -----
From: Cliff Barber To: hp_agilent_equipment@... Sent: Friday, March 08, 2013 2:35 PM Subject: Re: [hp_agilent_equipment] Re: Lamps and Mains Lead for HP412A? Hi, I wonder if Ebay item 360327851354 might be suitable. I had a similar requirement a few weeks ago, but managed to find something from my "junk-box" Cliff G4BGP ----- Original Message ----- From: mike To: hp_agilent_equipment@... Sent: Friday, March 08, 2013 1:41 PM Subject: [hp_agilent_equipment] Re: Lamps and Mains Lead for HP412A? Hi Dave, Neither, I'm afraid, but the halogen is closest, physically. It's a 6.3v, 0.15A lamp with 4mm pin pitch. Mike --- In hp_agilent_equipment@..., "David C. Partridge" <david.partridge@...> wrote: > > G4 (bi-pin halogen) or G4-1/2 (miniature Edison Screw, also known as E10)? If the latter both digikey and mouser stock some > > Dave > -----Original Message----- > From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of mike > Sent: 08 March 2013 08:15 > To: hp_agilent_equipment@... > Subject: [hp_agilent_equipment] Lamps and Mains Lead for HP412A? > > I've just acquired an HP412A & would like to find some replacement lamps for the choppers. > > They are a G4 base, 6.3v, 0.15A lamp. > Digikey, Mouser, Farnell nor RS seem to have them. > > Does anyone know of a source, please? (UK preferred, but beggars can't be choosers.) |
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Re: Lamps and Mains Lead for HP412A?
Yes, I could easily convert them to LEDs, but I'd like to stick closer to the original if I can.
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Thanks for the suggestion, though. Mike M0MLM ----- Original Message -----
From: Cliff White To: hp_agilent_equipment@... Sent: Friday, March 08, 2013 4:04 PM Subject: Re: [hp_agilent_equipment] Re: Lamps and Mains Lead for HP412A? I don't know the specifics on this, but I seem to remember an article I read somewhere on converting them to LEDs. That might be a possibility. Respectfully, Cliff White, W5CNW w5cnw@... <mailto:w5cnw@...> On 03/08/2013 08:35 AM, Cliff Barber wrote: > Hi, > I wonder if Ebay item 360327851354 might be suitable. > I had a similar requirement a few weeks ago, but managed to find something from my "junk-box" > Cliff > G4BGP > > ----- Original Message ----- > From: mike > To: hp_agilent_equipment@... > Sent: Friday, March 08, 2013 1:41 PM > Subject: [hp_agilent_equipment] Re: Lamps and Mains Lead for HP412A? > > > > > > Hi Dave, > > Neither, I'm afraid, but the halogen is closest, physically. > > It's a 6.3v, 0.15A lamp with 4mm pin pitch. > > Mike > > --- In hp_agilent_equipment@..., "David C. Partridge" <david.partridge@...> wrote: > > > > G4 (bi-pin halogen) or G4-1/2 (miniature Edison Screw, also known as E10)? If the latter both digikey and mouser stock some > > > > Dave > > -----Original Message----- > > From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of mike > > Sent: 08 March 2013 08:15 > > To: hp_agilent_equipment@... > > Subject: [hp_agilent_equipment] Lamps and Mains Lead for HP412A? > > > > I've just acquired an HP412A & would like to find some replacement lamps for the choppers. > > > > They are a G4 base, 6.3v, 0.15A lamp. > > Digikey, Mouser, Farnell nor RS seem to have them. > > > > Does anyone know of a source, please? (UK preferred, but beggars can't be choosers.) |
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Re: Lamps and Mains Lead for HP412A?
I don't know the specifics on this, but I seem to remember an article I
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read somewhere on converting them to LEDs. That might be a possibility. Respectfully, Cliff White, W5CNW w5cnw@... <mailto:w5cnw@...> On 03/08/2013 08:35 AM, Cliff Barber wrote:
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Re: LIF File Conversion.
A bit late to this discussion, but have you given this a try?
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Jay --- In hp_agilent_equipment@..., "danaz.chandler" <djn@...> wrote:
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Re: Lamps and Mains Lead for HP412A?
Cliff Barber
Hi,
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I wonder if Ebay item 360327851354 might be suitable. I had a similar requirement a few weeks ago, but managed to find something from my "junk-box" Cliff G4BGP ----- Original Message -----
From: mike To: hp_agilent_equipment@... Sent: Friday, March 08, 2013 1:41 PM Subject: [hp_agilent_equipment] Re: Lamps and Mains Lead for HP412A? Hi Dave, Neither, I'm afraid, but the halogen is closest, physically. It's a 6.3v, 0.15A lamp with 4mm pin pitch. Mike --- In hp_agilent_equipment@..., "David C. Partridge" <david.partridge@...> wrote: > > G4 (bi-pin halogen) or G4-1/2 (miniature Edison Screw, also known as E10)? If the latter both digikey and mouser stock some > > Dave > -----Original Message----- > From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of mike > Sent: 08 March 2013 08:15 > To: hp_agilent_equipment@... > Subject: [hp_agilent_equipment] Lamps and Mains Lead for HP412A? > > I've just acquired an HP412A & would like to find some replacement lamps for the choppers. > > They are a G4 base, 6.3v, 0.15A lamp. > Digikey, Mouser, Farnell nor RS seem to have them. > > Does anyone know of a source, please? (UK preferred, but beggars can't be choosers.) > No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.2904 / Virus Database: 2641/6155 - Release Date: 03/07/13 |
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Re: Lamps and Mains Lead for HP412A?
Hi Dave,
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Neither, I'm afraid, but the halogen is closest, physically. It's a 6.3v, 0.15A lamp with 4mm pin pitch. Mike --- In hp_agilent_equipment@..., "David C. Partridge" <david.partridge@...> wrote:
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Re: Lamps and Mains Lead for HP412A?
G4 (bi-pin halogen) or G4-1/2 (miniature Edison Screw, also known as E10)? If the latter both digikey and mouser stock some
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Dave -----Original Message-----
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of mike Sent: 08 March 2013 08:15 To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Lamps and Mains Lead for HP412A? I've just acquired an HP412A & would like to find some replacement lamps for the choppers. They are a G4 base, 6.3v, 0.15A lamp. Digikey, Mouser, Farnell nor RS seem to have them. Does anyone know of a source, please? (UK preferred, but beggars can't be choosers.) |
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Lamps and Mains Lead for HP412A?
I've just acquired an HP412A & would like to find some replacement lamps for the choppers.
They are a G4 base, 6.3v, 0.15A lamp. Digikey, Mouser, Farnell nor RS seem to have them. Does anyone know of a source, please? (UK preferred, but beggars can't be choosers.) I also need a mains lead (3 pin plug) for this meter. Does anybody have a spare that they'd sell to me? Alternatively, is the plug that HP used still available anywhere? It would be a shame if I have to modify it & fit a modern IEC socket. Thanks, Mike Bognor Regis, UK. |
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Re: Anybody Have a Manual for USM-323
J. Forster
OK. Apparently there are some various S/Ns with significant differences.
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His S/n is below. Best, -John ================= John |
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Re: Anybody Have a Manual for USM-323
Artekmedia
John
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We have it and Ken just ordered it Dave ArtekManuals On 3/7/2013 10:27 PM, J. Forster wrote:
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Dave Henderson Manuals@... www.Artekmanuals.com PO Box 175 Welch,MN 55089 651-269-4265 |
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Anybody Have a Manual for USM-323
J. Forster
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---------------------------- Original Message ----------------------------
Subject: S/N of USM-323 From: "Kenneth G. Gordon" <kgordon2006@...> Date: Thu, March 7, 2013 8:07 pm To: jfor@... -------------------------------------------------------------------------- Obviously, it is an older model: 1543A01355 Ken =========== Best, -John ==================== |
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Re: switch controllers 3499A vs 3488A?
Ok, thanks everyone!
73 Eugene W2HX From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of cnc_joker Sent: Wednesday, March 06, 2013 9:35 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Re: switch controllers 3499A vs 3488A? You will spend more for the cards than the switch. The only reason that I can think of is if there is a particular function that you need and that only the 3499 has a card that performs that function. Otherwise, the 3488 has lots of different cards that perform lots of different functions all for cheap. That seems the way to go. Pete. --- In hp_agilent_equipment@...<mailto:hp_agilent_equipment%40yahoogroups.com>, "W2HX" wrote:
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David C. Partridge
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