HP-3421A Service Manual is required.

There is one HP-3421A that does not turn on (+15, -15, + 5V is dead).

The measured value of C708 where oscillation is occurring inside the capacitor is 495(0.205).

C708(25V, 470uF) was replaced.

And when you turn on the power, +16.9V is measured in TP700, +7V in RT700, and +6.6V on top, regardless of S502(Switch).

However, +15V, -15V, and +5V cannot be measured.

I suspect the U702(LM393N, Dual Differential Comparator), but it is not easy to analyze because there is no circuit diagram.

If the “Wakeup Logic” on the left side of the figure can be related to S502, the problem is complicated, so I need a schematic.

Please tell me where to buy the service manual schematic(pdf, jpg).?

Re: Jacks added to 6623A System PSU

#105237

On Sun, Apr 19, 2020 at 11:09 AM, Michael Dunn wrote:

Does anyone know a source for pre-made ones

Well... I haven't seen (doesn't mean they don't exist)... but, I haven't seen the ones stamped out of sheet steel lately, and hardly the ones stamped out of brass ever.
But Pamona makes what they call "Stackable Shorting Double Banana Plug" with the banana plugs centered at 0.75 inch... that fit my HP 6111A, et. al. power supplies. Jameco, and others sell them. See.
Best regards.

E4418B modification information for the stand by battery

#105236

开云体育

Hi all

Can anyone help me with the modification information for the E4418B

to stop the stand by battery from draining

?

I know it exists as I had it a few months ago / last year but unable to find in my HP manuals

Regards Paul ?

?

Re: new File called App notes

#105235

I suspect that most at Keysight have little or no idea of the legacy that came before them as Hewlett Packard and Agilent. They most likely couldn't care less.

Stuart K6YAZ
Los Angeles, USA

Re: new File called App notes

#105234

Well written application notes are some of the best educational tools available; whether they are instrument specific or more general.
?
I prize the General Radio, Boonton, Wiltron and Hewlett Packard app notes. They have been a source of a great deal of my practical education.

Stuart K6YAZ
Los Angeles, USA

Re: Agilent 8753es Option 11 and TDR Measurements...

#105233

Burt,
Good distance resolution on TDR usually requires wide bandwidth, so you might upset some folks with significant out of channel power on a live antenna.
--John

Show quoted text

On Sun, Apr 19, 2020 at 07:43 AM, Burt K6OQK wrote:

John,

Thanks for you guidance, It helps a lot.

To give you a little background in how I've been using my 8753es and some of the hardware I have... I use it mostly for broadcast antenna measurements and antenna tuning. In many cases doing this on antennas in a high RF environment.? In order to do that I feed the RF out into an ENI 310L RF amplifier, which gives me about 10 watts out.? That feeds a (50 MHz to 1000 MHz) NARDA 3020A dual directional coupler through a 10 dB 50 watt attenuator to keep the amplifier happy.? The forward sample of the NARDA feeds the R input through a 20 dB pad, although I suppose I could feed the R input using a splitter directly off the RF out; one branch feeding the R input and the other branch feeding the ENI input.? The reflected sample feeds the A receiver via a 20 dB pad, and considering the return coupling I have about 40 dB of attenuation between the reflected and the A input.? I calibrate the system to the far end of my test cable using a Short', Open, and known 10 watt load that's sufficient for this frequency range.? Before I had the 8753es I used a spectrum analyzer with a tracking generator with the above stuffs as a Scalar Analyzer.? This method has worked out quite well.?

What do I want to be able to do?? I also want to be able to look at/sweep transmission lines, and typically with an antenna on the other end that's in a high RF environment.? Hence the need for the RF amp and a passel of attenuators to safely override what's coming back down the antennas from other stuffs - more of a "High Power" FDR system rather than TDR.? I have a Tek 1503C that I have used, but that requires disconnecting the transmission line at the top end, but that doesn't always show me what I'm looking for.?

Does my description make any sense to you?

Again, your guidance is sincerely appreciated.

Burt, K6OQK

Re: new File called App notes

#105232

On 4/19/20 4:09 PM, Bill Perkins wrote:
????TRYING to d'load:

????App Note 123 - Floating Measurements and Guarding

from here:

????


I get the attached screen shot ?

????Furthering Keysight's endless teases these days one can pull down
from that same page the attached spreadsheet, promising much more info
but w/o a single working link.

????Do they have a bunch 20-somethings chugging Red Bull doing this
stuff anymore ?  I expect it's more legions of dramatically underpaid (but willing)
people in India.

  File sent off-list.

          -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

Re: new File called App notes

#105231

TRYING to d'load:

	App Note 123 - Floating Measurements and Guarding

from here:

I get the attached screen shot ?

	Furthering Keysight's endless teases these days one can pull down from that same page the attached spreadsheet, promising much more info but w/o a single working link.

	Do they have a bunch 20-somethings chugging Red Bull doing this stuff anymore ?

	Bill @ PEARL, Inc.

Keysight Screw Up.jpg

Classic_App_Notes_List.xls

Re: new File called App notes

Bill Perkins

#105230

Hi Bill thank you
It appears there are possibly 3 sites with application notes on just
requires the contents of each site for a listing off the application notes
it has
Then perhaps we can fill in the missing ones to each site
So I assume we can use your list to help fill in any missing ones for the
benefit of all	Yes, go right ahead; and use anything else you'll find in that directory if you go up a level or two. I've made the server's file structure accessible exactly so that people can dig around as I have so. much. stuff I'll spend the rest of my days putting html in front of it all.

	TO THE LIST ADMIN:
	How do I change my subscription e-mail address ? Hit me off list if pls.

Regards Paul	Best,
	Bill @ PEARL, Inc.

Re: VXI documentation, was Re: [HP-Agilent-Keysight-equipment] new File called App notes

#105229

On 4/19/20 2:58 PM, Don Bitters via groups.io wrote:
Parts of the Agilent Technologies VXI business was sold to VXI
Technologies, just prior to the Agilent - Keysight split sometime? after
2003, so there may be info on their site about the Agilent VXI items.? I
believe Keysight kept everything that pertained to RF, Microwave, Power
measurement, DMM, O-scope technologies.? I think that most of the  Some did, but not all.  Many VXI modules are still currently sold by
Keysight, including Slot 0 controllers, relay muxes, etc.

            -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

Re: VXI documentation, was Re: [HP-Agilent-Keysight-equipment] new File called App notes

#105228

Parts of the Agilent Technologies VXI business was sold to VXI Technologies, just prior to the Agilent - Keysight split sometime? after 2003, so there may be info on their site about the Agilent VXI items.? I believe Keysight kept everything that pertained to RF, Microwave, Power measurement, DMM, O-scope technologies.? I think that most of the switching matrix items went with VXI Technologies.

Don Bitters

Re: new File called App notes

#105227

A worthy pursuit. B-)

          -Dave

Show quoted text

On 4/19/20 2:22 PM, Paul Bicknell wrote:
Hi Dave

I think they actually do know what an Application note is 
They where just having me on 

Paul 

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Dave McGuire
Sent: 19 April 2020 18:52
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] new File called App notes

On 4/19/20 4:16 AM, Paul Bicknell wrote:
Thank you for your input but I think the Dave's were having a laugh at
my expense as I hade reduced Application notes to a shortened version?  Not really, no.  While I will rarely pass up the opportunity to have a
laugh at someone else's expense (I can't help it!) in this instance I
was, and am still, honestly shocked that anyone involved with tech work,
today or thirty years ago, wouldn't know what an app note is.

            -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

Re: new File called App notes

#105226

Hi Dave

I think they actually do know what an Application note is 
They where just having me on 

Paul

Show quoted text

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Dave McGuire
Sent: 19 April 2020 18:52
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] new File called App notes

On 4/19/20 4:16 AM, Paul Bicknell wrote:
Thank you for your input but I think the Dave's were having a laugh at
my expense as I hade reduced Application notes to a shortened version?  Not really, no.  While I will rarely pass up the opportunity to have a
laugh at someone else's expense (I can't help it!) in this instance I
was, and am still, honestly shocked that anyone involved with tech work,
today or thirty years ago, wouldn't know what an app note is.

            -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

-----
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Re: Jacks added to 6623A System PSU

#105225

On 4/19/20 1:56 PM, Michael Dunn wrote:
I got a good deal on a 6623A triple system PSU last year, and finally
added binding posts to it (it only sports rear screw terminals as-is):
/g/HP-Agilent-Keysight-equipment/album?id=245498

Not the greatest model to use as a bench supply, but one makes do...  Nice solution!

         -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

Jacks added to 6623A System PSU

#105224

I got a good deal on a 6623A triple system PSU last year, and finally added binding posts to it (it only sports rear screw terminals as-is):
/g/HP-Agilent-Keysight-equipment/album?id=245498

Not the greatest model to use as a bench supply, but one makes do...

All that remains is to make links to join the output & sense posts. I've ordered some sheet brass & aluminum. Does anyone know a source for pre-made ones?

Re: new File called App notes

#105223

On 4/19/20 4:16 AM, Paul Bicknell wrote:
Thank you for your input but I think the Dave's were having a laugh at
my expense as I hade reduced Application notes to a shortened version?  Not really, no.  While I will rarely pass up the opportunity to have a
laugh at someone else's expense (I can't help it!) in this instance I
was, and am still, honestly shocked that anyone involved with tech work,
today or thirty years ago, wouldn't know what an app note is.

            -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

Re: new File called App notes

#105222

On 4/19/20 12:14 AM, Richard Knoppow wrote:
?? App notes mean Application notes. Publications that explained how to
use instruments. They varied from a single sheet to practically a book.
-hp- had some very good app notes on spectrum analysis and impedance
mesurement. General Radio also published ap notes on various techniques
such as sound measurement. These publications were often ahead of any
text book.  They've never been restricted to being about how to use instruments.
Many are about how to perform measurements, and other
non-instrument-specific stuff.  For example, the "bible" of that
mysterious "guard" terminal on high-end voltmeters: AN123, "Floating
Measurements and Guarding", from HP.

  App notes also come from component manufacturers...usually (but not
always!) they are about applications for a specific component, but many
many of them are much more general.  There's practically an EE degree's
worth of information distilled in the ones published by Linear
Technology over the years, for example.

?? I don't mean to take this away from Dave but its an example to me of
how once perfectly obvious meanings have been lost with time.  Uhh...this is a very current term.

          -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

Re: new File called App notes

#105221

On 4/18/20 10:37 PM, Paul Bicknell wrote:
I have already had my leg pulled about calling them  (App notes)
As apparently it ids not considered correct English   It's fine English.  They usually (but don't always) say "Application
Note" at the top, but the whole engineering world calls them "app notes"
today, as we have for decades.

              -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

VXI documentation, was Re: [HP-Agilent-Keysight-equipment] new File called App notes

#105220

On 4/18/20 8:10 PM, Andy ZL3AG via groups.io wrote:
ANYTHING that is on the Keysight website and nowhere else needs to be
archived ASAP. Lots of really useful stuff has already disappeared -
much of it on agilent.com URL's. If they split Keysight up and the TE
goes with the new brand AGAIN, we're screwed!  Yes, agreed 100%.  These days, web sites are controlled by suits, and
suits are not to be trusted with anything of value.

I've being trying to hunt down VXI stuff and it comes up on the Google,
but points to web/ftp hosts that no longer exist. :^(  I use VXI a lot, and I have tons of VXI documentation in PDF format
for lots of different things.  Email me if you're looking for something
specific, or if you want to sync up documentation collections in some way.

           -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

Re: new File called App notes

#105219

Hi bill thank you 

It appears there are possibly 3 sites with application notes on just
requires the contents of each site for a listing off the application notes
it has 

Then perhaps we can fill in the missing ones to each site 
So I assume we can use your list to help fill in any missing ones for the
benefit of all

Regards Paul

Show quoted text

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Bill Perkins
Sent: 19 April 2020 16:28
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] new File called App notes

	There's a 100MB .zip you are welcome to pull down and re-up from
your side:

	

/HP_App_Notes_Hbooks_Seminars/HP_App_Notes_Hbooks_Seminars.zip

	Bill @ PEARL, Inc.


 > > Hi all
 > >
 > > Recently  I have been looking at app notes for equipment  and 
realised we do
 > > not have a collection on the site
 > >
 > > So In the File section I have made a File  called App notes**
 > >
 > > Could I ask you all to help with putting any App notes you have in PDF
 > > format  into the new file
 > >
 > > Best Regards Paul






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