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
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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
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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
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Re: HP 3457A FET Transistors
OK, thank you for the valuable input, appreciated ? Best Regards ? CRAIG MAYFIELD | Director - Particle & Environmental Technologies ?
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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...
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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.
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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
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Re: datasheet 1906-0231 on HP8980A
Keysight gives this:
Diode-Rectifier dual VR-200V IF-15A
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
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Re: datasheet 1906-0231 on HP8980A
Hi,
It's seem to be a R712 from Microsemi:
Hope that it will help.
Best regards.
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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:
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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
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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
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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.
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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 ?
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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
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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!
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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
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Re: HP 3457A FET Transistors
Yeah, can't argue with that. (and I can argue with most anything)
-Dave
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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
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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
|
Hello I have find this in the power supply of hp8981a
Can someone tell me what this component is?
THANKS
?
|
HP 8594A Spectrum Analyzer - garbled Display after 3.6V battery replacement
Hello HP enthusiasts,
I have an HP 8594A spectrum analyzer. One day it greeted me with the dreaded "cal constants lost" message. After replacing the 3.6V AA battery, the analyzer came up fine on first startup. But now, on subsequent boot, the display is garbled. A check with a scope on the video output shows, that that the frequencies are all wrong (frame rate is 4.4Hz instead of 60Hz and line frequency is 9.4kHz instead of 16kHz). I have seen the garbled display before, when going into preset (but after a reboot, the analyzer was fine, so I just didn't use preset...). It seems to me, that the "unfitting preset" setting, is now the power on default? I've already got the 8590A service manual from Artek, but a complication came up - the (A16) cpu board is quite different from the description! It's marked as an "08593-60005". So from an HP8593A? I'm at a bit of an loss here. Since the analyzer comes up fine on first boot, I've had the thought to overwrite the preset with the "actually applied settings" in that moment, but can't find any information on how to "update the preset", so to speak. I hope to find someone here to shed some (or any, really) light on the situation, and revive the analyzer.
Kind regards, Christian
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No IF latch when input 1G signal into HP 5350B
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!
|
hello group,
I am looking for an OMs who would have a copy of the implementation of the components and settings of the LODA control card and TRACKING GENERATOR because I do not have it in the manual I have thank you very much ON4LJ Jo?l
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Dave McGuire
Michael A. Terrell
Christian