Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Re: HP 141T Test Accessories
The cables are available....at a price. The cable between the if unit and
toggle quoted message
Show quoted text
the rf unit is the most difficult because it is a hybrid D-type with coax inserts. The cables from the frame to the units is relatively straightforward the connectors are from the McMurdo blue range. (we bought red ones that seem to fit, but they were about $20 each. I think they are still stocked by Newark or Allied) These can often be found used "under the table" at flea markets, I believe. You can probably manage without the covers for this application. The pcb connector is I think a 4mm spacing, this is not common now but can be found amongst older bits......I even found some "veroboard" (you call it vectorboard I think) with that spacing and a gold plated connector, but was able to get hold of a couple of extender boards that will fit, though they carry another part number code. You can do a lot by taking the covers off the frame and the top cover off the RF unit and the lower cover off the IF unit (which allows access to the connector "backplane" before reinserting them. Just take care to keep away from the tube supplies!! I made a sheet of thin stiff plastic, folded to slot in over the tube compartment, for safety. Alan (G3NYK) ----- Original Message -----
From: "ardy41" <donley.dn@...> To: <hp_agilent_equipment@...> Sent: Tuesday, September 22, 2009 1:39 AM Subject: [hp_agilent_equipment] HP 141T Test Accessories Where can I get an extender board (HP P/N 11592-60011) for testing PCboards in the 141T plugins? Also needed is the cable (HP P/N 11592-60016) which connects the two plug-ins outside of the main frame. I know where to get a very expensive cable, but was looking for a more reasonable solution.
|
|
Re: HP 8662A parts needed
Thanks for the help guys, john miles has kindly offered me a panel (Thanks John!). Hopefully one day I will have enough useful bits to be able to help others with donor parts.
toggle quoted message
Show quoted text
Regards, Matt --- In hp_agilent_equipment@..., Richard Parrish <calcntr@...> wrote:
|
|
Re: OT, but fairly basic question- rf detectors
Here is some info about those things. Very easy to make when it's under 1GHz. I made several using geramnium, schottkey and kristaldiodes. For small signals with lowlevel the shunt type is the best option I think.
toggle quoted message
Show quoted text
Fred --- In hp_agilent_equipment@..., "Alan Melia" <Alan.Melia@...> wrote:
|
|
Re: Fluke
Peter Loron
I don't know if it is active or not, although I did look through the Fluke groups and didn't see one with very many members.
toggle quoted message
Show quoted text
Since you mention Scopemeters, I have a 123 which isn't starting up. I've determined that it has power, and using the keys to start up in mask mode gives a softer beep than then normal startup. All I get is the beep and the screen backlight coming on. Nothing else. I haven't gotten a chance to try any of the further troubleshooting steps in the service manual... -Pete On Sep 21, 2009, at 3:49 PM, Paul Kraemer wrote:
Pardon the off topic querry but does anyone know if the Fluke group on Yahoo |
|
Re: HP 141T Test Accessories
The connectors should be available from William Perry Company.
toggle quoted message
Show quoted text
73 Glenn WB4UIV At 08:39 PM 9/21/2009, you wrote:
Where can I get an extender board (HP P/N 11592-60011) for testing PC boards in the 141T plugins? Also needed is the cable (HP P/N 11592-60016) which connects the two plug-ins outside of the main frame. I know where to get a very expensive cable, but was looking for a more reasonable solution. |
|
Re: HP 8662A parts needed
Richard Parrish
I'm sure I have a front panel in my junk room if you'll pick up the postage.
toggle quoted message
Show quoted text
Richard Parrish calcntr@... --- On Mon, 9/21/09, Didier Juges <didier_juges@...> wrote:
From: Didier Juges <didier_juges@...> Subject: Re: [hp_agilent_equipment] HP 8662A parts needed To: hp_agilent_equipment@... Date: Monday, September 21, 2009, 7:59 PM ? Matt, if you do not find a panel, I'll be glad to take the best hi resolution picture I can of mine. You may be able to get a new one made using photo-sensitive aluminum sheets. I do not know where these are available nowadays, but I have used that material in the past with reasonable success (if you are desperate enough, YMMV) Didier KO4BB ____________ _________ _________ __ From: macurlis <macurlis@yahoo. com.au> To: hp_agilent_equipmen t@yahoogroups. com Sent: Saturday, September 19, 2009 5:13:54 AM Subject: [hp_agilent_ equipment] HP 8662A parts needed Hi Group, I've nearly completed rebuilding a 8662A that was in a horrible state. The nicd pack had exploded long ago and the fan had helped the corrosion spread all around. As well as that it was caked with dust worse than any instrument i've seen. Anyway after stripping, washing (!) and fixing corrosion related issues it basically works. The only thing which is beyond repair is the front-left sweep panel, the battery acid seems to have eaten the lettering of the panel. So is there anyone out there who has a donor unit with a this panel? I'd even be happy with fairly average one. Also it seems to have some failed LED modules, does anyone know if they are still available? Corrosion may have killed these aswell. I think they are also used in the 8640B. HP part nm. 1990-0330 Matt |
|
Re: HP 8662A parts needed
Didier Juges
Matt, if you do not find a panel, I'll be glad to take the best hi resolution picture I can of mine. You may be able to get a new one made using photo-sensitive aluminum sheets. I do not know where these are available nowadays, but I have used that material in the past with reasonable success (if you are desperate enough, YMMV)
Didier KO4BB ________________________________ From: macurlis <macurlis@...> To: hp_agilent_equipment@... Sent: Saturday, September 19, 2009 5:13:54 AM Subject: [hp_agilent_equipment] HP 8662A parts needed Hi Group, I've nearly completed rebuilding a 8662A that was in a horrible state. The nicd pack had exploded long ago and the fan had helped the corrosion spread all around. As well as that it was caked with dust worse than any instrument i've seen. Anyway after stripping, washing (!) and fixing corrosion related issues it basically works. The only thing which is beyond repair is the front-left sweep panel, the battery acid seems to have eaten the lettering of the panel. So is there anyone out there who has a donor unit with a this panel? I'd even be happy with fairly average one. Also it seems to have some failed LED modules, does anyone know if they are still available? Corrosion may have killed these aswell. I think they are also used in the 8640B. HP part nm. 1990-0330 Matt |
|
HP 141T Test Accessories
ardy41
Where can I get an extender board (HP P/N 11592-60011) for testing PC boards in the 141T plugins? Also needed is the cable (HP P/N 11592-60016) which connects the two plug-ins outside of the main frame. I know where to get a very expensive cable, but was looking for a more reasonable solution.
Are the connectors available to make a cable? |
|
Re: OT, but fairly basic question- rf detectors
Hi Dave I have a 2000 under the bench somewhere it has a problem I havent
toggle quoted message
Show quoted text
sorted yet, I was hooked on those "compactrons" :-)) It is probably propping up the bench !! I think any "diode probe" circuit would do, even using a silicon 1N4148 or 1N914. these were not precision equipments and were used only at faily high levels. The return to the mainframe is generally for the mixing in of markers, and is not essential if you dont want the markers. I have collected a number of Marconi, GR and, and HP diode detectors most would be overkill as they are rated to 10GHz or higher. Alan G3NYK ----- Original Message -----
From: <d.seiter@...> To: "hp agilent equipment" <hp_agilent_equipment@...> Sent: Monday, September 21, 2009 11:45 PM Subject: Re: [hp_agilent_equipment] Re: OT, but fairly basic question- rf detectors Hi John, Actually, I have 4 analysers... The issue is that this sweeper is designed so that signal goes out to the DUT, through the detector and back into the sweeper before returning out again as H and V signals for a scope or plotter. The detector expected is a simple BNC in/out type. -Dave ----- Original Message ----- From: "John S" <John@...> To: "hp agilent equipment" <hp_agilent_equipment@...> Sent: Monday, September 21, 2009 2:30:40 PM GMT -08:00 US/Canada Pacific Subject: [hp_agilent_equipment] Re: OT, but fairly basic question- rf detectors Dave: I'm assuming that you don't have access to a spectrum anlyser..... How about just plugging up to an oscilliscope with a 50 ohm thro-termination (or equivalent) ?? 0dBm = 0.632v p-p John --- In hp_agilent_equipment@... , d.seiter@... wrote: working correctly, but in order to ~calibrate it (or even completely verify operation) and need an appropriate rf detector.? The user manual is no help, "see our literature for recommended detectors", ...right...? The only plugin modual I have spans 0-20Mhz, so we're not talking high speeds here.? There's got to be a simple schottky based circuit that would work here.?
------------------------------------ Yahoo! Groups Links |
|
Re: OT, but fairly basic question- rf detectors
Hi John,
toggle quoted message
Show quoted text
Actually, I have 4 analysers...? The issue is that this sweeper is designed so that signal goes out to the DUT, through the detector and back into the sweeper before returning out again as H and V signals for a scope or plotter.? The detector expected is a simple BNC in/out type. -Dave ----- Original Message -----
From: "John S" <John@...> To: "hp agilent equipment" <hp_agilent_equipment@...> Sent: Monday, September 21, 2009 2:30:40 PM GMT -08:00 US/Canada Pacific Subject: [hp_agilent_equipment] Re: OT, but fairly basic question- rf detectors ? Dave: I'm assuming that you don't have access to a spectrum anlyser..... How about just plugging up to an oscilliscope with a 50 ohm thro-termination (or equivalent) ?? 0dBm = 0.632v p-p John --- In hp_agilent_equipment@... , d.seiter@... wrote:
[Non-text portions of this message have been removed] |
|
Re: OT, but fairly basic question- rf detectors
Be careful! your "RF detector must have a wide enough bandwidth to "see"
toggle quoted message
Show quoted text
the signal at full amplitude. Perhaps you can borrow a good HP Power Meter to do the job. As a last ditch' approach, a capacitance coupled full wave detector using a pair of good diodes in series, the mid point cap coupled to the RF signal to be detected, first diode other end connected to ground, the remaining diode end connected to a resistor and bypass cap will develop very close to peak -to-peak voltage. That you can easily convert to RMS. Ed Lawrence WA5SWD -- You and I are each unique, just like everyone else! -------------- Original message ----------------------
From: "John S" <John@...>
|
|
Re: OT, but fairly basic question- rf detectors
Dave:
toggle quoted message
Show quoted text
I'm assuming that you don't have access to a spectrum anlyser..... How about just plugging up to an oscilliscope with a 50 ohm thro-termination (or equivalent) ?? 0dBm = 0.632v p-p John --- In hp_agilent_equipment@..., d.seiter@... wrote:
|
|
Re: 332A balance pots
I think that this is not a good application for ten-turn pots,
toggle quoted message
Show quoted text
especially not a single one. You'd be forever cranking it from one end to the other. Two single-turn pots, one Coarse one Fine, is right for this job. The only trouble with the existing ones is (a) they get scratchy, and (b) the concentric arrangement exacerbates it. Considering that the top end of the 33x is 600kHz and it's a sensitive bridge, I'd be leery of remote-mounting a wirewound pot. In my case, the old outer-shaft Fine pot was serviceable, and I needed a new Coarse pot. Although you can find NOS original pairs, I think it's money wasted, because they're old, plus as an experiment I tried ganging a new pot, and it turned out that new pots are also susceptible to shaft motion. It was just a bad idea from the get-go. I installed it alone in a new location, and use it along with the old Fine pot. It's probably the best-balancing 332A in existence. Or ever :) (Not that I use it much, now that I scored a 339A.) Dave -----Original Message----- |
|
Re: 332A balance pots
J. Forster
Is there room to mount a multiturn pot in place of the ganged one?
toggle quoted message
Show quoted text
-John =================== Or mount a mini box on the side with a pair of NOS hamfest 10T Bournes |
|
Re: 332A balance pots
Geoff
Or mount a mini box on the side with a pair of NOS hamfest 10T Bournes which might cost $1 each. Shielded leads, good grounds, and all that fancy stuff.
toggle quoted message
Show quoted text
G ----- Original Message -----
From: David Wise To: 'hp_agilent_equipment@...' Sent: Monday, September 21, 2009 3:44 PM Subject: RE: [hp_agilent_equipment] 332A balance pots I've been there. Scratchy balance pots are the 331/332's bane. When you rotate the FINE pot (outer shaft) it wiggles the COARSE (inner) shaft around; even the slightest motion can exceed the entire range of the FINE pot. In my opinion HP screwed up, never should have made them concentric, or perhaps put FINE on the inside, as the outer shaft is less susceptible to mechanical disturbance. The only way to achieve smooth control in these instruments without spending crazy money is to discard the concentric arrangement and mount a separate COURSE pot elsewhere on the front panel. (My FINE pot was, er, fine. :) The memory is faded, but I think I used a 1/8"-shaft panel-mount conductive plastic pot, about five dollars from Mouser, and there was just enough room near the original pot and sort of diagonal to it. This mod eliminated all swearing. HTH, Dave Wise > -----Original Message----- > From: hp_agilent_equipment@... > [mailto:hp_agilent_equipment@...]On Behalf Of Michael > Sent: Sunday, September 20, 2009 3:52 AM > To: hp_agilent_equipment@... > Subject: [hp_agilent_equipment] 332A balance pots > > > Hi guys. Was wondering if anyone knew of a new/NOS source for > the dual concentric balance pots in these things? After > restoring my 332A it works fantastically except that I would > like to put a new balance pot in her. > > Cheers > Mike |
|
Re: 332A balance pots
I've been there. Scratchy balance pots are the 331/332's bane.
toggle quoted message
Show quoted text
When you rotate the FINE pot (outer shaft) it wiggles the COARSE (inner) shaft around; even the slightest motion can exceed the entire range of the FINE pot. In my opinion HP screwed up, never should have made them concentric, or perhaps put FINE on the inside, as the outer shaft is less susceptible to mechanical disturbance. The only way to achieve smooth control in these instruments without spending crazy money is to discard the concentric arrangement and mount a separate COURSE pot elsewhere on the front panel. (My FINE pot was, er, fine. :) The memory is faded, but I think I used a 1/8"-shaft panel-mount conductive plastic pot, about five dollars from Mouser, and there was just enough room near the original pot and sort of diagonal to it. This mod eliminated all swearing. HTH, Dave Wise -----Original Message----- |
|
OT, but fairly basic question- rf detectors
Ok, so I have Telonic SM-2000 sweeper from about '64, which appears to be working correctly, but in order to ~calibrate it (or even completely verify operation) and need an appropriate rf detector.? The user manual is no help, "see our literature for recommended detectors", ...right...? The only plugin modual I have spans 0-20Mhz, so we're not talking high speeds here.? There's got to be a simple schottky based circuit that would work here.?
Any ideas?? Thanks!? -Dave [Non-text portions of this message have been removed] |
|
Re: HP 5326 counter repair question
--- In hp_agilent_equipment@..., "Antonio" <afalcao@...> wrote:
If I understand correctly -5V is read by a multimeter (assuming the (-) probe of your multimeter is on the black terminal), connected at the DVM input terminals.Yep, that true. Now let's start some tests:No difference. The thing is that if I measure it with a high impedance meter (+100Mohm) it's -5 Volts. (it changes while turning the zero pot between about -9 and -4.5V so I put it on 5 as a reference. On a 10Mohm it's 2,5V and on a analoge AVO 8 or simpson there is no voltage. That's because it's own entrance is about 10Mohm I think. The first question is if -5V is present at ANY position of the DVM range (10V, 100V, 1000V) switch and the READ and READ B of function switch.Yes.that was the case but not any more Q3 at A12 was shorted. After replacement there is -5 at 10V, -2,5 at 100V and -0,25 at 1000V (If I remember the numbers right) So now the relais are switching again. But something else I noticed. I removed all the relais. Then the display had zero's like it should with all relais without a driver. After placing every transistor it stayed zero until I replaced Q3 with an original and tested transistor. Then the display started showing around 5V again. So it must be in that surrounding. If it is always present, I would simply pull out A12 and see if the display zeroes. If the display read near zero at this condition, the V to F (A13 board) and the remaining circuits can be considered good and the cause is really A12.Whitout A12 all is zero. First check continuity at pins 13 and 14 of the A12 card edge slot. This connection is the feedback path of the buffer and is completed at A13 (see schematic). If wrong it can lead to imbalance in the buffer stage and cause strange behavior.They are OK. zero ohm. If O.K., check diodes CR2 and CR3.They are OK too, it makes also no difference if I unsolder them or if they are in place. Short gate of FET Q7A to signal earth and put A12 back. The display > should zero if buffer amp is operating correctly.The nixies do go to zero. If it zeroes search for some input-switching leak putting -5V inI will look in that way. There is not much on that board. I measured all the pins without the A12 board and only pins pair 15 showed a strange value. All relais drivers had about 5V on the basis but the one behind pin 15 only 0,2V. For the rest no strange signals entering. There was a 2n2906 instead of the original transistor but I replaced it with a tested 2n964 like there should be. So now I have not -5V on all positions anymore (10,100,1000V) but there is still a leak. If I put a DC voltage on tje input terminals there is no reaction. It does not meassure even not when I apply 30V. Thanks for the advise. I'm glad I know something more now. Fred Antonio Falcao
|
|
Re: SA Module ID Help Please
J. Forster
Thanks Glenn & Jose. If anyone can test them (or is interested in them)
toggle quoted message
Show quoted text
please contact me off-list. Best, -John ================ Hello John, |
John Sykes
to navigate to use esc to dismiss