Re: HP8657B doubler issue
It's a small world I guess.
If I had that doubler I might try to reverse engineer it a bit to see if the problem is tractable.? It seems you have no trouble with the doubling circuitry, but the control circuit is messed up.? When the supply dropw, is it due to overload or insufficient available current?? Or perhaps voltage instability.? Lift the appropriate wire and insert a milliammeter.? Without a diagram it's more challenging.
I have a similar problem with a 3455A voltmeter.? It works great excapt it won't switch into 4 wire Ohms mode.? I have the cover off and am trying to see how that works.? I think there are relays involved so I might look for a burnt out relay driver or a bad connection.? It could also be a logic problem, and if so I am out of luck.
Bob
On Monday, April 8, 2019, 1:44:10 PM PDT, Ted Cuff <tcuff65@...> wrote:
I think that was my post on EEVBlog. :)
On Sat, Apr 6, 2019, 12:26 PM Bob Albert via Groups.Io <bob91343= [email protected]> wrote:
I suggest you go to EEVblog and connect with a guy there who has what seems to be the same issue.
As you probably know, HP has no available information on the innards of the doubler.? I repaired mine but it had a different problem.? The factory, even when it was supporting the unit, required that the doubler be returned to the factory for repair or replacement.? I don't know how much they charged for that but I suspect it would have been well over $1000, since the whole generator went for something like $13k.
I think this guy already tried relacing the regulator.? Anyway perhaps between you two a solution can be found.
Bob
On Saturday, April 6, 2019, 6:02:34 AM PDT, < tcuff65@...> wrote:
I read through a lot of the posts on the 8657b doubler issues, but haven't found any ideas that match my issue.
I seem to have the same issue VE2ZAZ had with his.
When my doubler acts up, a red led lights up inside the doubler, and the -5.2v supply gets loaded down.
Then after a little bit, the led goes out and the -5.2v supply recovers, and all is well again.
There is a power resistor by the 723 regulator that has overheated some.
I'm guessing that the led is tied to that regulator somehow.
But I have no idea where to begin with no service data available.
Also, is the 38v supply only for the doubler as well?
Thanks for any help.
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Re: Need original Service Manual of 8970B Noise Figure Meter
Glenn & ALberto
Thanks for the plug? and while our manual has 600 dpi large size scans of the schematics etc, it is unfortunately for 26xxA and 27xxA serial number units , may be useful for some boards, not for others his unit is31xx which is 4 years later production
Dave
manuals@...
toggle quoted message
Show quoted text
On 4/8/2019 3:22 PM, Glenn Little wrote: Artek has the scan of both the operator and service manual for $15.00 USD.
His quality is excellent.
73
Glenn
WB4UIV
On 4/8/2019 11:17 AM, Alberto, IZ2EWV wrote:
Hello friends,
I live in Italy (for the scope of the help I'm going to ask...) and own a hp 8970B Noise Figure Meter and the only copy of its Service Manual (standard version, up to 1600 MHz - for S/N prefixed 3106A and above) that I found in the Web is poor - surely scanned from a copy:
* block and schematic diagrams of larger size are scanned in
pieces, but the left/right sides are missing;
* too dark photos cannot show the tagged parts;
* too light pictures of the PCBs cannot show the tracks in
transparency.
I ask if anybody could send me a good copy of the Service Manual or borrow me an original paper folder, which I could scan by myself. Obviously, I would pay for round trip shipping.
Thank you in advance,
Alberto, IZ2EWV --
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
--
Dave
Manuals@...
www.ArtekManuals.com
|
Re: HP8657B doubler issue
I think that was my post on EEVBlog. :)
On Sat, Apr 6, 2019, 12:26 PM Bob Albert via Groups.Io <bob91343= [email protected]> wrote:
I suggest you go to EEVblog and connect with a guy there who has what seems to be the same issue.
As you probably know, HP has no available information on the innards of the doubler.? I repaired mine but it had a different problem.? The factory, even when it was supporting the unit, required that the doubler be returned to the factory for repair or replacement.? I don't know how much they charged for that but I suspect it would have been well over $1000, since the whole generator went for something like $13k.
I think this guy already tried relacing the regulator.? Anyway perhaps between you two a solution can be found.
Bob
On Saturday, April 6, 2019, 6:02:34 AM PDT, < tcuff65@...> wrote:
I read through a lot of the posts on the 8657b doubler issues, but haven't found any ideas that match my issue.
I seem to have the same issue VE2ZAZ had with his.
When my doubler acts up, a red led lights up inside the doubler, and the -5.2v supply gets loaded down.
Then after a little bit, the led goes out and the -5.2v supply recovers, and all is well again.
There is a power resistor by the 723 regulator that has overheated some.
I'm guessing that the led is tied to that regulator somehow.
But I have no idea where to begin with no service data available.
Also, is the 38v supply only for the doubler as well?
Thanks for any help.
|
Re: Need original Service Manual of 8970B Noise Figure Meter
Artek has the scan of both the operator and service manual for
$15.00 USD.
His quality is excellent.
73
Glenn
WB4UIV
On 4/8/2019 11:17 AM, Alberto, IZ2EWV
wrote:
Hello friends,
I live in Italy (for the scope of the help I'm going to ask...)
and own a hp 8970B Noise Figure Meter and the only copy of its
Service Manual (standard version, up to 1600 MHz - for S/N
prefixed 3106A and above) that I found in the Web is poor - surely
scanned from a copy:
- block and schematic diagrams of larger size are scanned in
pieces, but the left/right sides are missing;
- too dark photos cannot show the tagged parts;
- too light pictures of the PCBs cannot show the tracks in
transparency.
I ask if anybody could send me a good copy of the Service Manual
or borrow me an original paper folder, which I could scan by
myself. Obviously, I would pay for round trip shipping.
Thank you in advance,
Alberto, IZ2EWV
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
|
Re: Power Switch Button for HP 1631D
Hi Dave Some time ago, for mine, I redid one using a plastic profile, folded with hot air, to which I then pasted a button. It is not the original but it works. I had made one as a spare, if you want I can send it to you.
 
Dario IU3ARP
|
Re: Need original Service Manual of 8970B Noise Figure Meter
Thank you Siggi,
I just asked them, in order to know about the quality of the manual. Il giorno 08 apr 2019, alle ore 19:02, Siggi < siggi@...> ha scritto:
Hey Alberto,
looks like Artek Manuals has a scan (). Maybe you should hit them up for a copy?
Regards, Siggi On Mon, Apr 8, 2019 at 12:11 PM Alberto, IZ2EWV < iz2ewv@...> wrote: Hello friends,
I live in Italy (for the scope of the help I'm going to ask...) and own a hp 8970B Noise Figure Meter and the only copy of its Service Manual (standard version, up to 1600 MHz - for S/N prefixed 3106A and above) that I found in the Web is poor - surely scanned from a copy:
- block and schematic diagrams of larger size are scanned in pieces, but the left/right sides are missing;
- too dark photos cannot show the tagged parts;
- too light pictures of the PCBs cannot show the tracks in transparency.
I ask if anybody could send me a good copy of the Service Manual or borrow me an original paper folder, which I could scan by myself. Obviously, I would pay for round trip shipping.
Thank you in advance,
Alberto, IZ2EWV
Tnx es 73 deAlberto CalderaraVia Santa Marta, 2620871 Vimercate (MB) - ItalyIZ2EWV?amateur radio stationITU?28?– CQ?15?– WWL?JN45qo
|
Re: HP 8720D - Debugging story
Derek, if I had to make a guess, I would say that the previous owner did a DIY installation of the "8720DU Opt. 000 Peformance Update Kit". That would explain many of the problems you are seeing (pinched cable, heat sink, missing options in the firmware, and maybe more). Do a web search for document no. 08720-90372. This describes the conversion to the new CPU board and data entry into the EEPROM.
Vladan
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Re: Need original Service Manual of 8970B Noise Figure Meter
Hey Alberto,
looks like Artek Manuals has a scan (). Maybe you should hit them up for a copy?
Regards, Siggi
On Mon, Apr 8, 2019 at 12:11 PM Alberto, IZ2EWV < iz2ewv@...> wrote: Hello friends,
I live in Italy (for the scope of the help I'm going to ask...) and own a hp 8970B Noise Figure Meter and the only copy of its Service Manual (standard version, up to 1600 MHz - for S/N prefixed 3106A and above) that I found in the Web is poor - surely scanned from a copy:
- block and schematic diagrams of larger size are scanned in pieces, but the left/right sides are missing;
- too dark photos cannot show the tagged parts;
- too light pictures of the PCBs cannot show the tracks in transparency.
I ask if anybody could send me a good copy of the Service Manual or borrow me an original paper folder, which I could scan by myself. Obviously, I would pay for round trip shipping.
Thank you in advance,
Alberto, IZ2EWV
|
need original Service Manual of 8970B Noise Figure Meter
Hello friends, I'm based in Italy (for who should decide to help me...) and I have some issues around my 8970B, standard version (without options). The only PDF copy of the Service Manual of this version, which is available in the Web, was scanned in a bad way:
- especially the block and schematic diagrams, which are originally deployed on folded sheets, are truncated at?the left/right sides;
- the inside photos are too dark;
- the PCB pictures are too light and impossible to read the tracks.
No way to find a good copy in the Keysight's Web site. I ask you if anybody got a good scanned version or could borrow me an original paper manual, that I could scan in the best way and then share with you, once the job has been completed. Obviously, I should pay the shipping costs or consider other requests. Thank You in advance, Alberto, IZ2EWV
|
Power Switch Button for HP 1631D
I am missing the button on the end of the
power switch on my HP 1631D. It can still be turned on by
pushing the switch with a screw driver but doesn't look the
best.
Does anyone know if these switch buttons can
be sourced or is it a 3D print job? I don't have the CLIPs for
the unit so I can't identify the switch number but it looks like
the shaft on a standard push button switch except the shaft is
at 45 degrees (looks like a diamond from the front) and the
standard push button is generally not contoured.
Thanks
Dave
|
Re: Equivalent NPN Transistor for 8560E
Dave C
Opps you are right about the swap of
letters, I guess that make it more difficult.
Thanks for looking it up.
Dave I
On 8/04/2019 6:47 pm, Dave Casey wrote:
toggle quoted message
Show quoted text
1) You have your Xs and Ts transposed.
2) Looks like it crosses to a CXT2222A currently in stock
at Mouser and likely others. The "extra" lead in the body is
just like the tab on a TO-220 case; in this case it's the
collector as is the center pin.
Dave Casey
On Mon, Apr 8, 2019 at 5:31 AM
Dave Ireland < mirrors@...> wrote:
Tracked down the fault in a 8560E to
failure of the regulator transistor in the 100Mhz VCXO.
Substituted the supply and the oscillator circuit is
drawing little current so I am not sure why it would
have failed except there is evidence someone changed the
crystal so might have been their fault.
The transistor is listed is a
1854-1094 or manufacturer part number PTX2222A. Google
this results in a lot of Japanese and NPN thrown in the
mix. The Equivalents List says it is a MTX2222A which is
also a mystery.
I am assuming it is a SMD style
2N2222A but the under body solder pad with the 4 legs
has me a bit concerned it might be something special.
Anyone know this device? ? ?
Dave
|
Re: Equivalent NPN Transistor for 8560E
Doug
Thanks for that good detective work.
Looks like a 2222 will get it going in the short term while I fault find the long list of alarms.
Thanks again.
Dave
Sent from my Samsung GALAXY S5
toggle quoted message
Show quoted text
-------- Original message -------- From: Doug Bercich <doug@...> Date: 8/04/2019 19:30 (GMT+08:00) To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] Equivalent NPN Transistor for 8560E
Took a little amount of sleuthing, but I f you search for pxt2222a115 it appears to be an ordinary 2222 variant. The tab, opposing middle pin and “heatsink” are all one pin; the collector.?
Here’s an Octopart link, and you can get them on eBay too:
https://datasheet.octopart.com/PXT2222A%2C115-Nexperia-datasheet-87582290.pdf
-d
?
From: [email protected] on behalf of Dave Ireland <mirrors@...>
Sent: Monday, April 8, 2019 5:31 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Equivalent NPN Transistor for 8560E
?
Tracked down the fault in a 8560E to failure of the regulator transistor in the 100Mhz VCXO. Substituted the supply and the oscillator circuit is drawing little current so I am not sure why it would have failed except there is evidence
someone changed the crystal so might have been their fault.
The transistor is listed is a 1854-1094 or manufacturer part number PTX2222A. Google this results in a lot of Japanese and NPN thrown in the mix. The Equivalents List says it is a MTX2222A which is also a mystery.
I am assuming it is a SMD style 2N2222A but the under body solder pad with the 4 legs has me a bit concerned it might be something special. Anyone know this device? ? ?
Dave
|
Re: HP 8720D - Debugging story
I've done some basic testing and found a few fun things.
1) The blue data to the LCD is not connected
2) The Source Out -> In jumper on the back is cracked and the loss is too high below 500 MHz for the PLL to reliably work. Swapping jumpers makes the PLL lock reliably so I need a replacement but the system seems ok
3) The CPU heatsink was installed without ever removing the plastic sheet on top of the thermal paste!
The CPU fan for my 8720D is a Sunon AVD0504B2-8. It is mechanically different from the one you say is on the 8720ES. Looking at it there's a lot of lateral play on the fan axis so it's unsurprising that it's loud when the VNA is on it's side. Disappointing for what seems to be a quality fan, but good enough for it's usual use. I'd like to source a spare, but it's a lower priority now.
I borrowed a calibration kit and was able to make full two port measurements that match expectations between 500 MHz and 2 GHz. The calibration seemed good up to 20 GHz, but I need a better DUT to check that. I'm making a Beatty Standard this week to test with.
A replacement BR-2/3A battery arrived and will get installed tonight.
|
Re: Equivalent NPN Transistor for 8560E
Took a little amount of sleuthing, but I f you search for pxt2222a115 it appears to be an ordinary 2222 variant. The tab, opposing middle pin and “heatsink” are all one pin; the collector.?
Here’s an Octopart link, and you can get them on eBay too:
https://datasheet.octopart.com/PXT2222A%2C115-Nexperia-datasheet-87582290.pdf
-d
?
toggle quoted message
Show quoted text
From: [email protected] on behalf of Dave Ireland <mirrors@...>
Sent: Monday, April 8, 2019 5:31 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Equivalent NPN Transistor for 8560E
?
Tracked down the fault in a 8560E to failure of the regulator transistor in the 100Mhz VCXO. Substituted the supply and the oscillator circuit is drawing little current so I am not sure why it would have failed except there is evidence
someone changed the crystal so might have been their fault.
The transistor is listed is a 1854-1094 or manufacturer part number PTX2222A. Google this results in a lot of Japanese and NPN thrown in the mix. The Equivalents List says it is a MTX2222A which is also a mystery.
I am assuming it is a SMD style 2N2222A but the under body solder pad with the 4 legs has me a bit concerned it might be something special. Anyone know this device? ? ?
Dave
|
Re: Equivalent NPN Transistor for 8560E
1) You have your Xs and Ts transposed.
2) Looks like it crosses to a CXT2222A currently in stock at Mouser and likely others. The "extra" lead in the body is just like the tab on a TO-220 case; in this case it's the collector as is the center pin.
Dave Casey
On Mon, Apr 8, 2019 at 5:31 AM Dave Ireland < mirrors@...> wrote:
Tracked down the fault in a 8560E to failure
of the regulator transistor in the 100Mhz VCXO. Substituted the
supply and the oscillator circuit is drawing little current so I
am not sure why it would have failed except there is evidence
someone changed the crystal so might have been their fault.
The transistor is listed is a 1854-1094 or
manufacturer part number PTX2222A. Google this results in a lot
of Japanese and NPN thrown in the mix. The Equivalents List says
it is a MTX2222A which is also a mystery.
I am assuming it is a SMD style 2N2222A but
the under body solder pad with the 4 legs has me a bit concerned
it might be something special. Anyone know this device? ? ?
Dave
|
Equivalent NPN Transistor for 8560E
Tracked down the fault in a 8560E to failure
of the regulator transistor in the 100Mhz VCXO. Substituted the
supply and the oscillator circuit is drawing little current so I
am not sure why it would have failed except there is evidence
someone changed the crystal so might have been their fault.
The transistor is listed is a 1854-1094 or
manufacturer part number PTX2222A. Google this results in a lot
of Japanese and NPN thrown in the mix. The Equivalents List says
it is a MTX2222A which is also a mystery.
I am assuming it is a SMD style 2N2222A but
the under body solder pad with the 4 legs has me a bit concerned
it might be something special. Anyone know this device? ? ?
Dave
|
Re: Service Manual for HP 3708A
Hi Dario, I can assist, drop me a private mail. vk3gjm@...Regards Gerald
|
Re: HP86320A heterodyne module - need info
If you can’t find anything check out data for the ‘similar ranges’ plugin for the 8690. It was the 8699B. DaveB, NZ
?
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Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Ed Breya via Groups.Io
Sent: Monday, April 08, 2019 13:54
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP86320A heterodyne module - need info ? Does anyone have any info on the HP86320A heterodyne module? This was the back assembly of certain 862XX sweeper plug-ins from the 1970s. It provided two bands covering 100 MHz to 2 GHz, and 2-4 GHz, using a 2-4 GHz YTO for drive. I have a couple that I want to use for a project. I sort of had the basic hookups, supplies, etc figured out sufficiently many years ago, but of course now can't find my notes, and it still seems to be pretty obscure, info-wise. Not much out there on line. I mostly need to know the operating voltages for the power amplifier, the LO, and the proper PIN switch drive topology.
Ed
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HP86320A heterodyne module - need info
Does anyone have any info on the HP86320A heterodyne module? This was the back assembly of certain 862XX sweeper plug-ins from the 1970s. It provided two bands covering 100 MHz to 2 GHz, and 2-4 GHz, using a 2-4 GHz YTO for drive. I have a couple that I want to use for a project. I sort of had the basic hookups, supplies, etc figured out sufficiently many years ago, but of course now can't find my notes, and it still seems to be pretty obscure, info-wise. Not much out there on line. I mostly need to know the operating voltages for the power amplifier, the LO, and the proper PIN switch drive topology.
Ed
|
Looking for pair of MK38p70 piggyback Microcontrollers
I got out bid on a stick of these. (MK38p70) I need a couple for a project. Anyone have any.?
|
Dario
Doug Bercich