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Date

Re: LODA and TG 85644A

 

On Fri, Mar 3, 2023 at 01:26 AM, Jeremy B wrote:
I will have to look through the manual to refresh my memory. I do know it¡¯s wasn¡¯t particularly difficult to set up. The hardest part was installing the hardware.
hello Jeremy, well ok for your answer I will still look on my side if I find the manual for the installation of option 009-010 for the hp 8593e and yes well ok for the installation of the mechanics which is quite strenuous but you have to take the time.
thank you again Joel ON4LJ


Re: datasheet 1906-0231 on HP8980A

 

It is a 200V 15A avg rectified current 60A surge Common Cathode center-tapped rectifier diode.?
Let me know if these are not helpful.?

Clay


Re: SCC 1906-0231

 

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The ¡°1906-¡° prefix would indicate it is a varactor or thyristor the R712 reference designator indicates it is a resistive device. HP, Agilent, Keysight prefixes 1902-, 1906- are generally diode devices, rather than transistors.

NSN: 5961-01-135-1330 | Model: 1906-0231

Two or more diode semiconductor devices designed to function as a unit in changing alternating current to direct current. The diode devices are internally connected in series, and are permanently cased, encapsulated, potted, or molded together to form an inseparable unit. These units may be designed as either half-wave or full-wave rectifiers and may be mounted to form either single phase or three phase bridges. For interconnected items arranged in stac (s), see rectifier, semiconductor device. For items fabricated in the form of a monolithic or thin film structure that perform the function of a circuit, see integrated circuit (as modified) . Excludes semiconductor devices, unitized; semiconductor device assembly; and rectifier network, unitized.

NATO Stock Number
5961-01-135-1330
Overall Length
1.573 inches?
Overall Height
0.450 inches?
Overall Width
1.050 inches?
Circuit Connection Style Designator
Center tap 1 phase
Absolute Maximum Voltage Rating In Volts Per Characteristic
200.0 peak inverse voltage
Absolute Maximum Current Rating Per Characteristic
15.00 amperes average forward current averaged over a full 60-hz cycle
Material
Silicon
Terminal Type And Quantity
2 pin


Don Bitters


Re: LODA and TG 85644A

 

I will have to look through the manual to refresh my memory. I do know it¡¯s wasn¡¯t particularly difficult to set up. The hardest part was installing the hardware.


Re: HP 3457A FET Transistors

 

Nice! I recently got one of those, quite by accident, along with the rest of the components for that interferometer system. It's really neat stuff.

-Dave

On 3/2/23 03:27, Adrian Nicol wrote:
Now that's a plan! I just won a non-functioning HP 5518A Laser head for 200 bucks because I'd always wanted to play with one and was really looking forward to trying to fix it and find out how they worked....changed the (intact looking) fuse but which measured around 250k Ohms...... and the darn thing lit up, locked and worked pretty much to spec.....Oh rats!
Adrian
On 02/03/2023 04:17, Dave McGuire wrote:
I know!? I thought about asking a neighbor to come over and break it, and not tell me how.
--
Dave McGuire, AK4HZ
New Kensington, PA


Re: Video Information for the Wiki

 

Hi Zentronics
IMO, I am against it; but, if you can do it, I think anyone should be able to do it, as well.?
Some of the reason for that is... well... YouTubers make money... from video views, and the rest of us posting here don't.?
I think if the list is going to be monitized; then that should benefit the list.?
One could argue that the members proposal does benefit the list; but, that's an argument I haven't seen.
Maybe the List should have it. (Maybe the Mods will decide.)
Please let me know what you all think.
Best regards and wishes.
Roy


Re: HP 3457A FET Transistors

 

¿ªÔÆÌåÓý

OK, thank you for the valuable input, appreciated

?

Best Regards

?

CRAIG MAYFIELD | Director - Particle & Environmental Technologies

?

From: [email protected] <[email protected]> On Behalf Of fenugrec@...
Sent: Friday, 3 March 2023 1:20 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors

?

> I will get some on order

J3xx fet's should be (used to be ?) pretty cheap, I suggest getting quite a few more than required in case you need to do some matching or parameter binning for e.g. Idss , Vgs etc...


PS Craig, if you could disable your email signature for this list that would be nice; it comes with a bunch of attached images which is annoying and takes longer to load...


Re: SCC 1906-0231

Kenneth Harrison
 

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On Thu, Mar 2, 2023 at 10:41?AM Greg Muir via <big_sky_explorer=[email protected]> wrote:

It is CR19, part of the 5-volt rectifier circuit in the power supply assembly A22.? The HP description for part number 1906-0231 is ¡°DIODE-CT-RECT 200V 15A.¡±?

?

Looks like a fairly simple device to substitute with discrete diodes except that the high current rating might take some thermal consideration unless you can measure the actual current in that circuit and determine if the total current draw is small enough so as to? use them without any heat sinking.

?

If you have only lost one leg of the diode pair it shouldn¡¯t be too difficult to determine pin out with an ohmmeter.? From the way the schematic is drawn it looks like the case is the common between the two diodes.

?

Varo and a few other manufacturers were well known for their ¡°creative packaging¡± of some of their devices.? This apparently was one of them.

?

A portion of the schematic is attached.

?

Greg


--
Ken H.


Re: SCC 1906-0231

 

It is CR19, part of the 5-volt rectifier circuit in the power supply assembly A22.? The HP description for part number 1906-0231 is ¡°DIODE-CT-RECT 200V 15A.¡±?

?

Looks like a fairly simple device to substitute with discrete diodes except that the high current rating might take some thermal consideration unless you can measure the actual current in that circuit and determine if the total current draw is small enough so as to? use them without any heat sinking.

?

If you have only lost one leg of the diode pair it shouldn¡¯t be too difficult to determine pin out with an ohmmeter.? From the way the schematic is drawn it looks like the case is the common between the two diodes.

?

Varo and a few other manufacturers were well known for their ¡°creative packaging¡± of some of their devices.? This apparently was one of them.

?

A portion of the schematic is attached.

?

Greg


Re: datasheet 1906-0231 on HP8980A

 

Keysight gives this:
Diode-Rectifier dual VR-200V IF-15A


On Thu, Mar 2, 2023 at 11:10?AM <edipsoft@...> wrote:
Hello
?
I can't find any information on the component in the TO-3 case from power Supply HP8980A
?
It is written on it:
CSC
1906-0231
9046
?
THANKS


Re: datasheet 1906-0231 on HP8980A

 

Hi,

It's seem to be a R712 from Microsemi:





Hope that it will help.

Best regards.


Re: SCC 1906-0231

 

¿ªÔÆÌåÓý

my question/ suggestion is - where is it in the circuit? that will sometimes tell a lot about the device and its' function.
¸é±ð²Ô¨¦±ð

On 3/2/23 9:59 AM, Mike Lockley via groups.io wrote:

The best I have is Varo Semiconductors R712??? -some kind of rectifier pair

?

Good luck

?

Mike g4wam

?

?

?

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of edipsoft@...
Sent: 02 March 2023 09:22
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] SCC 1906-0231

?

Hello

I have find this in the power supply of hp8981a

Can someone tell me what this component is?

THANKS

?



Re: SCC 1906-0231

 

¿ªÔÆÌåÓý

The best I have is Varo Semiconductors R712??? -some kind of rectifier pair

?

Good luck

?

Mike g4wam

?

?

?

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of edipsoft@...
Sent: 02 March 2023 09:22
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] SCC 1906-0231

?

Hello

I have find this in the power supply of hp8981a

Can someone tell me what this component is?

THANKS

?


Re: HP 3457A FET Transistors

 

On 3/2/23 12:37, Alex wrote:
We used to have a member that was the original designer at HP of the analog front ends for both the 3468/3478 DMMs and I am sure he would have been very helpful with the 3457A as well as I am sure it was also very close in design. Unfortunately he passed away last year, his name was George Hnatiuk, and he was always very helpful person both in knowledge and often even almost giving away original HP parts from his personal stash for almost nothing, and/or sending additional freebes along the purchases. A unique person that will be greatly missed.
Yes. I very much miss George's extremely informative posts and his general helping style. He was a great guy, and his work will live on.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA


Re: HP 3457A FET Transistors

 

We used to have a member that was the original designer at HP of the analog front ends for both the 3468/3478 DMMs and I am sure he would have been very helpful with the 3457A as well as I am sure it was also very close in design. Unfortunately he passed away last year, his name was George Hnatiuk, and he was always very helpful person both in knowledge and often even almost giving away original HP parts from his personal stash for almost nothing, and/or sending additional freebes along the purchases. A unique person that will be greatly missed.

On Wed, Mar 1, 2023 at 08:42 PM, Craig Mayfield wrote:

Dear Sir / Madam

I have only just joined this group earlier today and am still trying to work
out how to navigate my way around

I have a HP 3457A and it keeps giving me an error 256. I have replaced the
filter caps and followed the steps in as shown in a series of YouTube videos
and I can get the diagnostic 8 to pass most of the time, however it then
fails. On the YouTube series, the guy replaced 6 of the FETS as shown in the
attached document. I am trying to find modern equivalents of these to order
them. I have contacted Keysight and Element 14 to no avail. Can someone
suggest a part number and or brand of FET I can use which should do the job as
per the manufacturers original specs ?


Re: SCC 1906-0231

 

Am 02.03.2023 um 10:21 schrieb edipsoft@...:

According to the HP Xref list, this is JEDEC R712 from manufactorer Varo Inc. Hope this datasheet helps:



Bernd


Re: No IF latch when input 1G signal into HP 5350B

 

Hi Samba,

Do you have the service manual?
Have you read the trouble shooting section?
Please be careful around the sampler, as it is a sensitive device.
I would follow the trouble shooting, and first check the DC voltages for voltage within the required range, and also check for ripple.

Next would be to check the LO signal. Notice this is around 14dBm, so use attenuators.
What test equipment do you have? (spectrum analyzer, oscilloscope with 500MHz band with, frequency counter, power meter and so on.)

Regards,
Askild


On Thu, Mar 2, 2023 at 5:10?PM wlk-0001 <wlk-0001@...> wrote:
Dear All

I need ?some help about HP 5350B . NO IF LATCH led and NOT PHASE LATCHED led are all on when 1Ghz signal input to INPUT 1 connector .? And It can be measured well when 500Mhz signal input to INPUT 2 connector . So i want to know if the GaAs Sampler has damaged and how to check .?

Thanks!


Video Information for the Wiki

 

I have some YouTube videos on the way for some vintage HP equipment. I have a bunch made for Tek gear but the plan was never to be exclusive. I am curious if this is content that the group would like to add to the wiki pages? If so how would I be able to add links to the units under the correct model numbers. I currently have content for a modern frequency counter 51313A as well as some videos on the way for a 200CD, HP410B,and HP 412C. With more always on the way.

Zen


Re: HP 3457A FET Transistors

 

Yeah, can't argue with that. (and I can argue with most anything)

-Dave

On 3/1/23 23:18, Craig Mayfield wrote:
That was a good price
Best Regards
CRAIG MAYFIELD | Director - Particle & Environmental Technologies
Alpha Scientific Pty Ltd
Melbourne Office
Phone: (03) 9893 3972
Mobile: 0413 124 589
Email: craig@...
Website: www.alphascientific.com.au
This e-mail message and any attachments are subject to copyright and they are intended only for the addressee and may contain confidential or privileged information. Confidentiality and privilege are not waived if you are not the intended recipient of this e-mail, nor may you use or retain, or disclose, copy or forward to any third party this e-mail, or any information contained in or attached to it. If you received this e-mail in error please delete it (and any copy of it from your computer system) and kindly notify the sender by reply e-mail. Alpha Scientific Pty Ltd does not warrant that this e-mail and / or any attachments are error or virus free and recommends that all attachments be scanned / checked for computer viruses.
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire
Sent: Thursday, 2 March 2023 3:17 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A FET Transistors
I know! I thought about asking a neighbor to come over and break it, and not tell me how. But then I just decided to be happy about getting a 3457A for $75. B-)
-Dave
On 3/1/23 19:59, Radu Bogdan Dicher wrote:
Dave - terrible!!! How did you cope with that at the time?.... :)

On Wed, Mar 1, 2023 at 4:55?PM Dave McGuire <mcguire@...
<mailto:mcguire@...>> wrote:

On 3/1/23 19:52, Craig Mayfield wrote:
> OK, thanks David
>
> I assume I can email you back directly, is that correct ?

Sure. But while I own a 3457A, I've never had to repair it, so I
can't help you with your FET issue.

It was frustrating, actually. I bought it on eBay as "broken",
wouldn't power on, and got it very cheap. (like $75) The power switch
was mechanically jammed. I was looking forward to a fun
troubleshooting
session!

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA






--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA


datasheet 1906-0231 on HP8980A

 

Hello
?
I can't find any information on the component in the TO-3 case from power Supply HP8980A
?
It is written on it:
CSC
1906-0231
9046
?
THANKS