¿ªÔÆÌåÓý

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Expanded Topics Messages
Date
Re: HP 85046 S-parameter Test set: Port A & Port B connectors availability

Dr. David Kirkby from Kirkby Microwave Ltd
 

On Wed, 10 Jul 2019 at 22:39, peter bunge <bunge.pjp@...> wrote:
Is it an A or B? The HP85046B is a 75 ohm version.
The connectors are not standard nor easy to replace. Maybe someone had thoughts of converting a 75 ohm to 50 ohm - good luck with that.

Note the A, B, R and RF in on a 75 ohm 85046B test set are all 50 ohm. It is only the test ports, which are 50 or 75 ohm.

I did actually convert a 75 ohm 85046B to 50 ohm by replacing the bridges from a 50 ohm 8503A 1.3 GHz test set. This site gave me the idea



At the time, the combined cost of the 1.3 GHz test set plus a 75 ohm 85046B test set, were much cheaper than an 85046A 50 ohm test set. Since I have a 20 GHz microwave VNA, I was not bothered about limiting the performance to 1.3 GHz. In fact, the 1.3 GHz bridges actually meet the spec of the 85046A to 2 GHz, and is quite usable at 3 GHz.

If the A and B ports of an S-parameter test set are missing, then its really anyone's guesses what has been done to it. Obviously, someone has picked it apart for some reason - perhaps would of the bridges are blown up, and it became a parts doner.


Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892

Tel 01621-680100 / +44 1621-680100
Re: HP 85046 S-parameter Test set: Port A & Port B connectors availability

 

Is it an A or B? The HP85046B is a 75 ohm version.
The connectors are not standard nor easy to replace. Maybe someone had thoughts of converting a 75 ohm to 50 ohm - good luck with that.
You are faced with connecting to a saphire substrate. The spec of fly poop in the picture below is one of the 50 ohm terminating resistors. If they are blown you have even bigger problems. This is one item you want complete and working. Sorry for the bad news.
0103_1.jpg

On Wed, Jul 10, 2019 at 4:24 PM garp6 <hrgerson@...> wrote:
hi,

HP 85046 S-parameter Test Set arrived without the external Port A & PortB connectors.

Does anyone have a spare set of these connectors , (or have some mechanical description of how to make them) ??

thank you,
rick

Re: E4407B restoration project: Frequency Reference Error

 

FIXED! Turned out the 100 MHz VCXO was not quite reaching frequency. AT max tuning voltage (about 26.6V) it measured 99.999,950 MHz. Perhaps the XTAL has aged but no replacement found. Took a chance and reduced the small caps to GND near the XTAL (from 39 and 56 pF to 22 pF for both) and it worked! Measures 100.000,000,01 MHz at a tuning voltage of 20V.

How about that!
Re: WTB a TDK 114H1 common mode choke

 

Thanks Siggi. How did you find that? My search turned up nothing.
It is as I suspected but now I know what inductance to aim for.
I'm still hoping to find one. There must be a stash somewhere.
Peter

On Wed, Jul 10, 2019 at 12:42 PM Siggi <siggi@...> wrote:
Here's a datasheet:?.
Looks like 1:1:1:1 CM coil, maybe coilcraft have something similar?

On Tue, Jul 9, 2019, 7:06 PM peter bunge <bunge.pjp@...> wrote:
Does anyone have a TDK 114H1 common mode choke. At least that is what I think it is, see schematic below.
This is at the input of the floating power supply in an HP4192A LF impedance analyzer. I was looking for the short that blew out the 700v transistors and was confused to find the +5v, +15v, and -15v power supplies all seemed to be shorted to ground. I did not believe there could be 3 shorted capacitors nor could I believe that T3 had all windings shorted together but that is what my ohm-meter was telling me. I removed it and yes all windings are shorted together, one winding is ground.
If no one has one how about suggestions? Wind four wires on a small toroid, varnish, and install? I think it is a common mode choke and needs the ground return to go through it to cancel the field generated by the DC currents.? I don't think it is critical and, given the second one in series, I might not notice a difference with just jumper wires, or wires through a ferrite bead. I am surprised at the lack of small capacitors, just many aluminum electrolytics.?

Attachments:
Re: HP 85046 S-parameter Test set: Port A & Port B connectors availability

 

¿ªÔÆÌåÓý


Are the couplers there?

Even if the couplers are there, you may be out of luck. I seem to recall that they are bonded to the substrate or soldered directly to the smallest coax I have ever seen.?

Bob

On Jul 10, 2019, at 16:24, garp6 <hrgerson@...> wrote:

hi,

HP 85046 S-parameter Test Set arrived without the external Port A & PortB connectors.

Does anyone have a spare set of these connectors , (or have some mechanical description of how to make them) ??

thank you,
rick

HP 85046 S-parameter Test set: Port A & Port B connectors availability

 

hi,

HP 85046 S-parameter Test Set arrived without the external Port A & PortB connectors.

Does anyone have a spare set of these connectors , (or have some mechanical description of how to make them) ??

thank you,
rick
Re: HP Service Note availability

 

On Wed, Jul 10, 2019 at 09:11 AM, Harold Foster wrote:
*someone* has a binder full of them.

The original??fundraiser had a comment with someone who had more than a binder full of HP related microfiche.??

Looks like the website has changed.? Does anyone remember or know who had posted that they have HP microfiche that can be scanned also?
Re: 5335A OSM for serials greater than 2232A

 

There is an addendum on Didier's site that (allegedly) updates the 05335-90021 manual to cover S/Ns through 2520. ??

It's just an addendum, not a fully updated manual. ?You'll have to apply the changes described in the addendum to your manual. ?Briefly perusing the addendum, it appears mostly to correct errors and to apply component ?and procedural changes to the original; no major circuit design changes.

Cheers,
Dave M
Re: WTB a TDK 114H1 common mode choke

 

Here's a datasheet:?.
Looks like 1:1:1:1 CM coil, maybe coilcraft have something similar?

On Tue, Jul 9, 2019, 7:06 PM peter bunge <bunge.pjp@...> wrote:
Does anyone have a TDK 114H1 common mode choke. At least that is what I think it is, see schematic below.
This is at the input of the floating power supply in an HP4192A LF impedance analyzer. I was looking for the short that blew out the 700v transistors and was confused to find the +5v, +15v, and -15v power supplies all seemed to be shorted to ground. I did not believe there could be 3 shorted capacitors nor could I believe that T3 had all windings shorted together but that is what my ohm-meter was telling me. I removed it and yes all windings are shorted together, one winding is ground.
If no one has one how about suggestions? Wind four wires on a small toroid, varnish, and install? I think it is a common mode choke and needs the ground return to go through it to cancel the field generated by the DC currents.? I don't think it is critical and, given the second one in series, I might not notice a difference with just jumper wires, or wires through a ferrite bead. I am surprised at the lack of small capacitors, just many aluminum electrolytics.?

Attachments:
Re: HP Service Note availability

 

Second here on the offer to help scan... And I agree, *someone* has a binder full of them.

Hal
Re: WTB a TDK 114H1 common mode choke

 

Thanks Ed. See my other reply with photo. I think a pair of windings shorted and burnt the insulation off the other windings and caused all to short together. It must be thin wire on a toroid and now a melted blob of less than an ohm between any two pins with no pins open.?
I suggest NOT following the manual where it says to disconnect the collector of the overcurrent sense transistor to disable the protection. It is safer to look for a short with an ohm meter. In this case all six rectifiers in the?+5v,?+15v, and -15v supplies appeared to be shorted (less than an ohm). I did not believe that and looked elsewhere. Pulling a connector indicated the short was off the main power supply board but still did not make sense. One shorted capacitor is not surprising, two shorted capacitors unlikely, three shorted capacitors better start thinking something different. The resistance went up as I moved away from the choke. Four shorted windings in a choke seemed impossible and I expected to find the choke OK but had to remove it to check further.?
Anyway still looking for a spare before trying to wind one. I don't like the idea of four windings touching even if varnished. Formvar is good but can it be trusted? I suppose all windings touch adjacent wires in any transformer.
PeterB

On Tue, Jul 9, 2019 at 10:33 PM Ed Breya via Groups.Io <edbreya=[email protected]> wrote:
Is the choke wound with fairly thin wire? It would be unusual for a CM choke to have all its windings shorted together unless it got very hot from fault current or adjacent heat sources, or by serious over-voltage between the windings. I'd recommend leaving out the choke and just jumping the lines until the cause is figured out. Rewinding or replacing the choke later should be fairly easy.

Ed

Re: WTB a TDK 114H1 common mode choke

 

I think the choke started with shorted adjacent windings which soon caused all windings to short together.
There is no sign of a short past it now it is removed. It was shorting the +5v, +15v, and -15v supplies together. It is about 3/8" cube like a DIP8
It is probably a toroid with 4 windings. TDK seems to be impossible to contact and have too many catalogs. Is it a coil, transformer, transient suppressor, or? Because it is from 1980 it is probably not in their catalogs and they would have no interest in selling me just one. Keysight may have a spare if no one here has one, or a scrapped HP4192A. There are two on the board but twelve 113G1 which look the same only pins 3 & 4 are missing (so 3 windings). The pin numbering is different from a DIP, see below. You can see the second one and the holes where I removed the bad one which had no signs of damage externally like discoloration, cracks, or swelling.??
TDK114H1.jpg

On Tue, Jul 9, 2019 at 7:16 PM doug <dmcgarrett@...> wrote:


On 07/09/2019 03:05 PM, peter bunge wrote:
> Does anyone have a TDK 114H1 common mode choke. At least that is what I
> think it is, see schematic below.
> This is at the input of the floating power supply in an HP4192A LF
> impedance analyzer. I was looking for the short that blew out the 700v
> transistors and was confused to find the +5v, +15v, and -15v power
> supplies all seemed to be shorted to ground. I did not believe there
> could be 3 shorted capacitors nor could I believe that T3 had all
> windings shorted together but that is what my ohm-meter was telling me.
> I removed it and yes all windings are shorted together, one winding is
> ground.
> If no one has one how about suggestions? Wind four wires on a small
> toroid, varnish, and install? I think it is a common mode choke and
> needs the ground return to go through it to cancel the field generated
> by the DC currents.? I don't think it is critical and, given the second
> one in series, I might not notice a difference with just jumper wires,
> or wires through a ferrite bead. I am surprised at the lack of small
> capacitors, just many aluminum electrolytics.
>
>If all the wires are shorted together, the choke got awfully hot, so you
need to find out what load got shorted and burned it out. It may
still be shorted. I would think that you could wind your own
replacement, but you need to find the problem first.

--doug, WA2SAY, retired RF engineer
Re: HP Service Note availability

 

I agree, Service Notes are very hard to find. I have posted several requests in this forum in the past in search of the microfiche libraries that HP supposedly published. No success so far.
I did get some 5345A service notes from a group member a while back and scanned/posted them in the files section. Still many for the 5345A missing though that I haven't been able to locate.
I have to believe that someone out there has a big library of service notes ... just a matter of finding the person! I offer my help to scan and posting ...

Thank you,
wschraml, KI7PFX
Re: WTB a TDK 114H1 common mode choke

 

Is the choke wound with fairly thin wire? It would be unusual for a CM choke to have all its windings shorted together unless it got very hot from fault current or adjacent heat sources, or by serious over-voltage between the windings. I'd recommend leaving out the choke and just jumping the lines until the cause is figured out. Rewinding or replacing the choke later should be fairly easy.

Ed
Re: HP Service Note availability

 

When I was looking for service notes on my 4396B combo analyzer, I found one or two google hits at this address:



from which I was then able to spoof the URL to check for all the others issued for my model #.

In my experience, if google doesn't know about it, it probably doesn't exist :/
Re: WTB a TDK 114H1 common mode choke

 

On 07/09/2019 03:05 PM, peter bunge wrote:
Does anyone have a TDK 114H1 common mode choke. At least that is what I
think it is, see schematic below.
This is at the input of the floating power supply in an HP4192A LF
impedance analyzer. I was looking for the short that blew out the 700v
transistors and was confused to find the +5v, +15v, and -15v power
supplies all seemed to be shorted to ground. I did not believe there
could be 3 shorted capacitors nor could I believe that T3 had all
windings shorted together but that is what my ohm-meter was telling me.
I removed it and yes all windings are shorted together, one winding is
ground.
If no one has one how about suggestions? Wind four wires on a small
toroid, varnish, and install? I think it is a common mode choke and
needs the ground return to go through it to cancel the field generated
by the DC currents. I don't think it is critical and, given the second
one in series, I might not notice a difference with just jumper wires,
or wires through a ferrite bead. I am surprised at the lack of small
capacitors, just many aluminum electrolytics.

If all the wires are shorted together, the choke got awfully hot, so you
need to find out what load got shorted and burned it out. It may
still be shorted. I would think that you could wind your own replacement, but you need to find the problem first.

--doug, WA2SAY, retired RF engineer
Re: HP Service Note availability

 

Thanks - tons of Application notes around, but no Service notes...

You can find some here, but only a few - newer?



Hal
WTB a TDK 114H1 common mode choke

 

Does anyone have a TDK 114H1 common mode choke. At least that is what I think it is, see schematic below.
This is at the input of the floating power supply in an HP4192A LF impedance analyzer. I was looking for the short that blew out the 700v transistors and was confused to find the +5v, +15v, and -15v power supplies all seemed to be shorted to ground. I did not believe there could be 3 shorted capacitors nor could I believe that T3 had all windings shorted together but that is what my ohm-meter was telling me. I removed it and yes all windings are shorted together, one winding is ground.
If no one has one how about suggestions? Wind four wires on a small toroid, varnish, and install? I think it is a common mode choke and needs the ground return to go through it to cancel the field generated by the DC currents.? I don't think it is critical and, given the second one in series, I might not notice a difference with just jumper wires, or wires through a ferrite bead. I am surprised at the lack of small capacitors, just many aluminum electrolytics.?
Spoken for: Free for postage: logic analyzer pods for Paratronics system 5000

 

Hello--

My thanks go to all who responded!

73--

Brad? AA1IP
Re: HP Service Note availability

 

On Tue, Jul 9, 2019 at 07:50 AM, Harold Foster wrote:
Does anyone know if any more are available somewhere?

I'm aware of the Application Notes in these locations:

?(Under Resources in heading)

? (Service Notes mouse over link in first paragraph)

ftp://ftp.agilent.com/pub/manuals/public/pub/manuals/?(There aren't much for notes here)

?(Few here)

?(Few here)

Hope this helps!

?
53901 - 53920 of 151488