Hi Fransesco, yes I saw the other posting ....well it was worth a try, it
sometimes works :-))  Hope the bits are useful

Alan G3NYK

----- Original Message -----
From: "francesco messineo" <francesco.messineo@...>
To: <hp_agilent_equipment@yahoogroups.com>
Sent: Friday, November 13, 2009 11:32 AM
Subject: Re: [hp_agilent_equipment] 78511-xxxx


> Hi Alan,
>
> seems like  the 78511A is a kind of patient monitor system, I was only
> looking at classic test instruments and that's why I couldn't find
> anything matching.
> I will then save the boards for parts and make an adapter to read all
> 2532s just in case one day anyone would need the content.
> Best regards
>
> Francesco IZ8DWF
>
> On 11/13/09, Alan Melia <Alan.Melia@...> wrote:
> >
> >
> >
> >
> >
> >
> > Hi Francesco, On some early pcbs I obtained recently the instrument
model
> >  number was the last 4 digits of the first 5 digit number. This would
suggest
> >  you look at an 8511 (what ever that is....I dont have the list to hand)
> >
> >  Alan G3NYK
> >
> >  ----- Original Message -----
> >  From: "francesco messineo" <francesco.messineo@...>
> >  To: "hp_agilent_equipment" <hp_agilent_equipment@yahoogroups.com>
> >  Sent: Thursday, November 12, 2009 8:24 PM
> >  Subject: [hp_agilent_equipment] 78511-xxxx
> >
> >  > Hello,
> >  > I have some digital boards marked HP 78511-0xxx, does anyone know
what
> >  > equipment they are from? Electronics is quite old, I'd say from
> >  > seventies, the eproms are 2532 and these are not listed in my
> >  > programmer (which is enough old to know the 2716).
> >  >
> >  > Regards
> >  >
> >  > Francesco IZ8DWF
> >  >
> >  >
> >  > ------------------------------------
> >  >
> >  > Yahoo! Groups Links
> >  >
> >  >
> >  >
> >
> >
> >
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

Dave,
I'm not sure I presently have anything for use via GPIB, though there certainly
were some from Agilent and perhaps John's software will do that as well. But I
thought in case you hadn't already nixed it, that I might remind you that one
can easily set the 'save' type to 'screen' and dump the screen image to a .gif,
.bmp or Windows meta file format to the lovely (not) on-board floppy drive or
the internal hard drive from the base instrument. From one of those locations
you may find it easier to get to an external application.

Glenn
n6gn
--- In hp_agilent_equipment@yahoogroups.com, "Dave Baxter" <dave@...> wrote:
>
> Hi..
>
> Anyone know of a simple to use (by non tech's) easy installed (on Win2k
> with NI-GPIB) screen capture program for the Agilent E4407B spectrum
> analyzer?

Clive, do you have a part number/vendor to recommend?

Thanks

Didier

Sent from my BlackBerry wireless thingy while I do other things...

-----Original Message-----
From: Clive Redfern <semiochemic@...>
Date: Fri, 13 Nov 2009 04:53:16
To: <hp_agilent_equipment@yahoogroups.com>
Subject: Re: [hp_agilent_equipment] RF RES

Hello Samir,

I would recommend that you look to a semiconductor 100 Watt Hybrid 50 ohm
Termination Load Resistor.
These are small and all you need to do is mount it on a heat sink and attach a
socket.
Suitably mounted and encased these devices are good to GHz.
They are often priced at less than 10USD and, because they are small/not heavy,
low on shipping cost.

I prefer this type of beast up to 100W.

At the kw level go for large resistive - they burn out more slowly! ...but
shipping would be appreciable to your location.

Clive (F5VHS/G4CZR)



________________________________
From: samir habbaki <habbak@...>
To: hp_agilent_equipment@yahoogroups.com
Sent: Mon, November 9, 2009 10:58:34 AM
Subject: [hp_agilent_equipment] RF RES


HI FOR ALL THE GROUP

I LOOK FOR USED RF RESISITIVE LOAD  50 AND 100 OHM FOR SEVERAL WATT  IF SOMEONE
NEED TO SELL WITH REASONABLE PRICES PLS REPLY

THANKS
SAMIR HABBAKI 




[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links






[Non-text portions of this message have been removed]




[Non-text portions of this message have been removed]

Hello Samir,

I would recommend that you look to a semiconductor 100 Watt Hybrid 50 ohm
Termination Load Resistor.
These are small and all you need to do is mount it on a heat sink and attach a
socket.
Suitably mounted and encased these devices are good to GHz.
They are often priced at less than 10USD and, because they are small/not heavy,
low on shipping cost.

I prefer this type of beast up to 100W.

At the kw level go for large resistive - they burn out more slowly! ...but
shipping would be appreciable to your location.

Clive (F5VHS/G4CZR)



________________________________
From: samir habbaki <habbak@...>
To: hp_agilent_equipment@yahoogroups.com
Sent: Mon, November 9, 2009 10:58:34 AM
Subject: [hp_agilent_equipment] RF RES


HI FOR ALL THE GROUP

I LOOK FOR USED RF RESISITIVE LOAD  50 AND 100 OHM FOR SEVERAL WATT  IF SOMEONE
NEED TO SELL WITH REASONABLE PRICES PLS REPLY

THANKS
SAMIR HABBAKI 




[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links






[Non-text portions of this message have been removed]

Hi..

Anyone know of a simple to use (by non tech's) easy installed (on Win2k
with NI-GPIB) screen capture program for the Agilent E4407B spectrum
analyzer?    Agilents own Benchlink demo program fails to install,
something about installable drivers failing.

I used to have something that came with the instrument, that would dump
the screen image straight into a Word document (nice.)  But that was
many IT support changeovers ago, and that, along with many other useful
things (that they don't understand) have long gone.

(Why is it that IT support people, if it's not part of Windows, or
MS-Office, remove or block it without asking, then when you do ask, are
obviously not interested, despite the fact they work for us, and it's a
needed tool or utility for work purposes!)

Sadly, I haven't got the time to write one myself, mind you, most of the
home grown tools and tricks they've also removed!

P'd off and fed up....

Regards...

Dave Baxter
Technical Manager:

AR United Kingdom Ltd.

email:  dave@...
Mobile: +44 (0)7940 536219
Office: +44 (0)1908 282766
Fax:    +44 (0)1908 288249
web:    http://www.uk-ar.co.uk/
Skype:  daveatemv (By prior arangement)

Please consider the environment before printing this email.

This email and any files transmitted with it are confidential and
intended for the addressee only.  If you have received this email in
error please do not distribute, disclose, use, copy or amend any of the
information contained within it.  Please notify the sender immediately
by return email and subsequently destroy all copies.

AR United Kingdom Ltd is registered in England. Registered No. 1967634.
Registered office:  Unit 8 Madingley Court, Kingston, Milton Keynes,
Bucks. MK10 0BZ

Hi Alan,

seems like  the 78511A is a kind of patient monitor system, I was only
looking at classic test instruments and that's why I couldn't find
anything matching.
I will then save the boards for parts and make an adapter to read all
2532s just in case one day anyone would need the content.
Best regards

Francesco IZ8DWF

On 11/13/09, Alan Melia <Alan.Melia@...> wrote:
>
>
>
>
>
>
> Hi Francesco, On some early pcbs I obtained recently the instrument model
>  number was the last 4 digits of the first 5 digit number. This would suggest
>  you look at an 8511 (what ever that is....I dont have the list to hand)
>
>  Alan G3NYK
>
>  ----- Original Message -----
>  From: "francesco messineo" <francesco.messineo@...>
>  To: "hp_agilent_equipment" <hp_agilent_equipment@yahoogroups.com>
>  Sent: Thursday, November 12, 2009 8:24 PM
>  Subject: [hp_agilent_equipment] 78511-xxxx
>
>  > Hello,
>  > I have some digital boards marked HP 78511-0xxx, does anyone know what
>  > equipment they are from? Electronics is quite old, I'd say from
>  > seventies, the eproms are 2532 and these are not listed in my
>  > programmer (which is enough old to know the 2716).
>  >
>  > Regards
>  >
>  > Francesco IZ8DWF
>  >
>  >
>  > ------------------------------------
>  >
>  > Yahoo! Groups Links
>  >
>  >
>  >
>
>
>

Hi Francesco, On some early pcbs I obtained recently the instrument model
number was the last 4 digits of the first 5 digit number. This would suggest
you look at an 8511 (what ever that is....I dont have the list to hand)

Alan G3NYK

----- Original Message -----
From: "francesco messineo" <francesco.messineo@...>
To: "hp_agilent_equipment" <hp_agilent_equipment@yahoogroups.com>
Sent: Thursday, November 12, 2009 8:24 PM
Subject: [hp_agilent_equipment] 78511-xxxx


> Hello,
> I have some digital boards marked HP 78511-0xxx, does anyone know what
> equipment they are from? Electronics is quite old, I'd say from
> seventies, the eproms are 2532 and these are not listed in my
> programmer (which is enough old to know the 2716).
>
> Regards
>
> Francesco IZ8DWF
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

On 11/12/09, langlv56 <lang02@...> wrote:
>
>
>
>
>
>
> It seems that these boards are used in a big medical monitoring equipment.
>  Lang
>
>
that's why I didn't find any test equipment with that code :-)

Thanks

Francesco

I've been watching for your posts on progress with this project with much
interest.  I have a 741B on the shelf and a bag of H11F1M's waiting for the time
to do the work.  How many optocouplers did you have to audition to find a
reasonable match?

Hope you find the time to make some diag/documentation available for us(me) from
which to obtain more detail.


[Non-text portions of this message have been removed]

Does anybody out there have data and/or a manual on this elusive hp item? This
has 3 mixers (up to 2-18Ghz) and some kind of IF amp in one box. I remain
mystified by how it works even after opening it, so I could really use some
help. I want to use it as a general mixer for microwave down-conversion, but I
just can't fathom how the IF works in this unit. I can't find it in any of my
many HP catalogs, it's not at the agilent site, and nothing on the web, so I am
even more mystified.

all help gratefully appreciated,
walter
sphere research corp.
http://www.sphere.bc.ca

I'm guessing you can find them if you Google .... probably around $100 or
so..... You CAN use a 2-01C in SOME probe bases (not all), because the two
"contact fingers" are too long for the 2-01C . (They can be trimmed back).

Thank YOu
Kiss-Electronics
Ms Ashley Hall
Cornelius, Oregon


W7DUZ


www.kiss-electronics.com


-----Original Message-----
From: arthur <arthurok@...>
To: hp_agilent_equipment@yahoogroups.com
Sent: Thu, Nov 12, 2009 6:06 pm
Subject: [hp_agilent_equipment] ea53 tube wanted



anyone have any ea53 tubes

------------------------------------
Yahoo! Groups Links
    Individual Email | Traditional
    http://docs.yahoo.com/info/terms/



[Non-text portions of this message have been removed]

anyone have any ea53 tubes

Thanks John,  just what I was looking for. I had called Agilent tech
support and they
could not find a clip for the 8595. I thought I had looked pretty
thoroughly on the site
but probably missed it because it was labeled as 8590 info. Now we'll
see if I am smart
enough to actually FIX it.

best, Bob
> Bob,
> The schematics for many of the 859XE series board are in the following manual
on the Agilent site:
> <<http://cp.literature.agilent.com/litweb/pdf/5963-2591.pdf>>
> The title says 8590A, but it really does not cover that unit at all, it covers
the other 859X series stuff.
> --John Gord
>
> --- In hp_agilent_equipment@yahoogroups.com, bobd <bobd@...> wrote:
>
>>
>> My 8595E has a baseline shift on most attenuator settings. The 0,20,30,
>> 40 and 50 db settings of the atten cause
>> the baseline to jump up by 60db. The 70 db setting only shifts up by
>> 20db. 10 and 60 db are OK. This happens
>> when the IF signal is disconnected so the problem would seem to be on
>> the A16 processor board or bad info
>> from the A7 analog interface board. I have downloaded the 859X service
>> manual, but it doesn't show much
>> beyond the block level. Does anyone have component level diagrams for
>> these boards?
>>
>>
>> Bob, wa6m
>>
>>
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
>

Now that the schematics are on KO4BB, you can
follow along.

I think I'm meeting spec on low-frequency noise;
on the 10mV range with 10^4 post-gain (1uV full-scale),
it rarely moves more than one minor division (0.1uV),
and has drifted only about 0.5uV over the past day.
It's virtually immune to changes in line voltage.

I believe I have demonstrated proof-of-concept for
replacing photocell choppers with the Fairchild H11F1
photofet optoisolator.  Total cost is about $20.

On the modulator side you have to select a pair with
matched Vos.  I made a box out of double-sided PCB
material the same size as the original A17 photochopper
module, with two pairs of opto ICs sticking through
slots cut in opposing sides.  The box's interior
contains the drive wiring; as with the original,
the wires exit through the bulkhead the assembly
is mounted on.

Since the modulator can be at 1000V but still has to
present over 10^10 ohms input resistance, it's imperative
that the terminals be well-insulated.  The photocell module
had teflon standoffs, but I was able to use a standard
phenolic terminal strip by guarding it.  It's mounted
on a nylon standoff, and the mounting terminal is
connected to the main loop feedback line.  Since this
is never more than 10uV away from the other terminals,
there is no current from input to ground no matter how
bad the terminal strip leaks.

I drive the opto's with a CD4069 powered from a
convenient +16V power rail, using the original
neon drive multivibrator for sync.  I put the 4069
and associated parts on a bit of perfboard mounted
to the original A8 board with a standoff.
It uses six previously-unused PCB edge contacts to
get power and transmit drive pulses to the opto's.
I was almost able to make this backward-compatible;
you have to lift one capacitor lead off the old board
to correct the LED drive timing.  Avoiding this would
make the daughter board much more complex.

I am using 5mA of drive, which gives about 200uA of
pinch-off current on the FET side.  At the demodulator,
this is adequate to output the design maximum of -30V.

An additional challenge in the 740B is protecting the
modulator from up to 1000V of continuous overload without
compromising Vos.  The original Rube Goldberg circuit
had a neon lamp across the photocells, which ignites
on overload, which lights a photocell, which switches
a transistor, which turns off an incandescent lamp,
which opens up a second photocell that's in series
with the input.  The neon fires at 90V, three times
the opto's breakdown rating.  Useless.  I came up with
a new protector that combines a TVS diode (MCC SMAJ30CA)
across each opto with an active current limiter in
series with the input.  This is four TO-92 Supertex
LND150 500V N-channel depletion-mode mosfets, arranged
as two 500V bidirectional limiters in series.  When
the current is low, all the opto sees is the mosfet
Rds(on) plus the current-setting resistors.  I'm using
4.7K, for a 200uA limit.  On maximum overload this puts
about 100mW into each active LND150.  I think this
is bulletproof.

The new protection makes the old cutout relay
superfluous, and a good thing - just as with the
choppers, both photocells are bad.  A9V1's
on-resistance has drifted so high it is unable
to switch the transistor, and A9V2, in series with
the input, has mutated into a 20uV photovoltaic cell.
THAT's where the offset, noise, and line voltage
sensitivity were coming from.

What remains?  With 100%-efficient choppers, the
loop gain is almost twice normal, so I'll change
the select-on-test resistor that sets the AC gain.
This should reduce the noise further.  The second
chopper amp, which drives the meter, is also short
on gain.  No doubt its photocells are as tired as
the main ones.  I'll make another H11F1 assembly.
Finally, the A13 ovenized reference puts a +/- 10V
thermistor bridge and a floating microvolt-level
reference all on the same cheap brown leaky circuit
board.  Horrendous.  Fortunately there's a clear
space between the reference and the bridge.  I will
saw the board down the middle and insert a polycarbonate
spacer, and line the can with polyimide film.

Dave Wise

Bob,
The schematics for many of the 859XE series board are in the following manual on
the Agilent site:
<<http://cp.literature.agilent.com/litweb/pdf/5963-2591.pdf>>
The title says 8590A, but it really does not cover that unit at all, it covers
the other 859X series stuff.
--John Gord

--- In hp_agilent_equipment@yahoogroups.com, bobd <bobd@...> wrote:
>
>
>
> My 8595E has a baseline shift on most attenuator settings. The 0,20,30,
> 40 and 50 db settings of the atten cause
> the baseline to jump up by 60db. The 70 db setting only shifts up by
> 20db. 10 and 60 db are OK. This happens
> when the IF signal is disconnected so the problem would seem to be on
> the A16 processor board or bad info
> from the A7 analog interface board. I have downloaded the 859X service
> manual, but it doesn't show much
> beyond the block level. Does anyone have component level diagrams for
> these boards?
>
>
> Bob, wa6m
>

It seems that these boards are used in a big medical monitoring equipment.
Lang

--- In hp_agilent_equipment@yahoogroups.com, francesco messineo
<francesco.messineo@...> wrote:
>
> Hello,
> I have some digital boards marked HP 78511-0xxx, does anyone know what
> equipment they are from? Electronics is quite old, I'd say from
> seventies, the eproms are 2532 and these are not listed in my
> programmer (which is enough old to know the 2716).
>
> Regards
>
> Francesco IZ8DWF
>

I need to make a extender cable to service a 141. I'm looking
for the Female connector that is used on the 8553,4,5 series
RF modules that is marked P3. This is the mate for the one on the 8552
that interconnects the RF to IF.
  Anyone have a parts mule that can be cannibalized?

Thanks    Joe  wa9cgz

Hello,
I have some digital boards marked HP 78511-0xxx, does anyone know what
equipment they are from? Electronics is quite old, I'd say from
seventies, the eproms are 2532 and these are not listed in my
programmer (which is enough old to know the 2716).

Regards

Francesco IZ8DWF

This TO-18 low-noise low-current NPN Si transistor isn't
in the usual cross-reference document.  Does anybody
have access to deeper info?

Not that it's essential; I just want to satisfy my curiosity.
I'm currently using an MPS6521 with decent results, and may
try a 2SC900 (the quietest transistor I own), then compare
with the cheap easy-to-get Fairchild KSC900 to see if FC
knew what they were copying.

Any other suggestions?  This is for the first stage of
a microvolt-level chopper amp.

Thanks,
Dave Wise

My 8595E has a baseline shift on most attenuator settings. The 0,20,30,
40 and 50 db settings of the atten cause
the baseline to jump up by 60db. The 70 db setting only shifts up by
20db. 10 and 60 db are OK. This happens
when the IF signal is disconnected so the problem would seem to be on
the A16 processor board or bad info
from the A7 analog interface board. I have downloaded the 859X service
manual, but it doesn't show much
beyond the block level. Does anyone have component level diagrams for
these boards?


Bob, wa6m

Subject says all - of course I don't want to pay Pace's prices!!!!  Does
anyone have excess stock?

Ever the optimist :-)
David Partridge

--- On Thu, 11/12/09, Chris Trask <christrask@...> wrote:

From: Chris Trask <christrask@...>And you probably thought that
Windows 95 was not worth bothering with:



http://spectrum. ieee.org/ computing/ hardware/ rebuilding- the-ibm-1401



Chris

     Win 95 will also be a collector's item one day. A truely frightening
thought!





[Non-text portions of this message have been removed]

I am looking for an original paper manual for a HP 8673E Sig Gen.  They do not
have the manual for this version on their site.

Thanks,
Pete WA2ODO

And you probably thought that Windows 95 was not worth bothering with:

     http://spectrum.ieee.org/computing/hardware/rebuilding-the-ibm-1401

Chris

      ,----------------------.       High Performance Mixers and
     /    What's all this     \    Amplifiers for RF Communications
    / extinct stuff, anyhow?  /
    \  _______,--------------'           Chris Trask / N7ZWY
   _ |/                                  Principal Engineer
  oo\                                  Sonoran Radio Research
(__)\       _                             P.O. Box 25240
   \  \    .'  `.                     Tempe, Arizona 85285-5240
    \  \  /      \
     \  '"        \                 IEEE Senior Member #40274515
      .       (  ) \
       '-| )__| :.  \              Email: christrask@...
         | |  | | \  '.       http://www.home.earthlink.net/~christrask
        c__; c__;  '-..'>.__

                        Graphics by Loek Frederiks

On Wed, 11 Nov 2009 19:06:29 -0500, you wrote:

>HELP! I have tried every way possible to UNSUBSCRIBE from this group, can
anyone help, the repeated attempts per the instructions on site have failed.....

Sign in to yahoo groups.  Go to your groups and select this one.  You
should be able to unsubscribe from there.  Your other options are to
read by web only, get a digest, get all as emails, etc.

Harvey

>  ----- Original Message -----
>  From: Alan Melia
>  To: hp_agilent_equipment@yahoogroups.com
>  Sent: Wednesday, November 11, 2009 6:16 PM
>  Subject: Re: [hp_agilent_equipment] Re: HP3325A Confusion Believe it or
not...
>
>
>
>  Yes and in the sub-cable field ...."you cant "test in" reliability (quality)
>  ".... it has to be designed in.
>
>  Alan G3NYK
>
>  ----- Original Message -----
>  From: "J. Forster" <jfor@...>
>  To: <hp_agilent_equipment@yahoogroups.com>
>  Sent: Wednesday, November 11, 2009 9:44 PM
>  Subject: RE: [hp_agilent_equipment] Re: HP3325A Confusion Believe it or
>  not...
>
>  > When I was bulding spacecraft payloads, there was an axiom:
>  >
>  > You CANNOT inspect in quality.
>  >
>  > -John
>  >
>  > ===========
>  >
>  >
>  >
>  > >> Even in the "good ole days" there were mixups. I have found typos
>  > >> and such on schematics and other documentation, as well as an odd
>  > >> assembly error -- a capacitor marked 200 pf on one side and 160
>  > >> pf on the other. It should have been 160, but it was a 200
>  > >> causing incorrect behavior subtle enough that I didn't notice
>  > >> until I was calibrating by the manual. This was an 8555A,
>  > >> probably built in about 1974 with the wrong part!
>  > >>
>  > >> It's quite possible a TL610 was accidentally substituted for a
>  > >> '601, which would keep the reference of the following opamp
>  > >> (U38?) from being properly grounded. But it may be grounded by
>  > >> the input impedance of the '610 part or something that may cause
>  > >> it to miss some spec (or not) but was never noticed by users.
>  > >
>  > > That's plausible. One of my 11848As was built with the wrong
>  regulator --
>  > > as I recall, they used an adjustable LM338K-style part where a fixed
>  > > 12-volt
>  > > regulator was called for (or vice versa, I don't remember now). By
>  > > coincidence the output voltage was almost correct, enabling the unit to
>  > > work
>  > > unless you turned on an oscillator that drew enough current to load down
>  > > the
>  > > supply. The factory test procedure evidently wasn't comprehensive
>  enough
>  > > to
>  > > trigger the failure.
>  > >
>  > > That was a really hard problem to find.
>  > >
>  > > -- john, KE5FX
>  > >
>  > >
>  > >
>  > > ------------------------------------
>  > >
>  > > Yahoo! Groups Links
>  > >
>  > >
>  > >
>  > >
>  >
>  >
>  >
>  >
>  > ------------------------------------
>  >
>  > Yahoo! Groups Links
>  >
>  >
>  >
>
>
>
>
>
>
>------------------------------------------------------------------------------
>
>
>
>  No virus found in this incoming message.
>  Checked by AVG - www.avg.com
>  Version: 8.5.425 / Virus Database: 270.14.60/2496 - Release Date: 11/11/09
07:40:00
>
>
>[Non-text portions of this message have been removed]
>
>
>
>------------------------------------
>
>Yahoo! Groups Links
>
>
>

HELP! I have tried every way possible to UNSUBSCRIBE from this group, can anyone
help, the repeated attempts per the instructions on site have failed.....
   ----- Original Message -----
   From: Alan Melia
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Wednesday, November 11, 2009 6:16 PM
   Subject: Re: [hp_agilent_equipment] Re: HP3325A Confusion Believe it or not...



   Yes and in the sub-cable field ...."you cant "test in" reliability (quality)
   ".... it has to be designed in.

   Alan G3NYK

   ----- Original Message -----
   From: "J. Forster" <jfor@...>
   To: <hp_agilent_equipment@yahoogroups.com>
   Sent: Wednesday, November 11, 2009 9:44 PM
   Subject: RE: [hp_agilent_equipment] Re: HP3325A Confusion Believe it or
   not...

   > When I was bulding spacecraft payloads, there was an axiom:
   >
   > You CANNOT inspect in quality.
   >
   > -John
   >
   > ===========
   >
   >
   >
   > >> Even in the "good ole days" there were mixups. I have found typos
   > >> and such on schematics and other documentation, as well as an odd
   > >> assembly error -- a capacitor marked 200 pf on one side and 160
   > >> pf on the other. It should have been 160, but it was a 200
   > >> causing incorrect behavior subtle enough that I didn't notice
   > >> until I was calibrating by the manual. This was an 8555A,
   > >> probably built in about 1974 with the wrong part!
   > >>
   > >> It's quite possible a TL610 was accidentally substituted for a
   > >> '601, which would keep the reference of the following opamp
   > >> (U38?) from being properly grounded. But it may be grounded by
   > >> the input impedance of the '610 part or something that may cause
   > >> it to miss some spec (or not) but was never noticed by users.
   > >
   > > That's plausible. One of my 11848As was built with the wrong
   regulator --
   > > as I recall, they used an adjustable LM338K-style part where a fixed
   > > 12-volt
   > > regulator was called for (or vice versa, I don't remember now). By
   > > coincidence the output voltage was almost correct, enabling the unit to
   > > work
   > > unless you turned on an oscillator that drew enough current to load down
   > > the
   > > supply. The factory test procedure evidently wasn't comprehensive
   enough
   > > to
   > > trigger the failure.
   > >
   > > That was a really hard problem to find.
   > >
   > > -- john, KE5FX
   > >
   > >
   > >
   > > ------------------------------------
   > >
   > > Yahoo! Groups Links
   > >
   > >
   > >
   > >
   >
   >
   >
   >
   > ------------------------------------
   >
   > Yahoo! Groups Links
   >
   >
   >






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[Non-text portions of this message have been removed]

Yes and in the sub-cable field ...."you cant "test in" reliability (quality)
".... it has to be designed in.

Alan G3NYK

----- Original Message -----
From: "J. Forster" <jfor@...>
To: <hp_agilent_equipment@yahoogroups.com>
Sent: Wednesday, November 11, 2009 9:44 PM
Subject: RE: [hp_agilent_equipment] Re: HP3325A Confusion Believe it or
not...


> When I was bulding spacecraft payloads, there was an axiom:
>
> You CANNOT inspect in quality.
>
> -John
>
> ===========
>
>
>
> >> Even in the "good ole days" there were mixups. I have found typos
> >> and such on schematics and other documentation, as well as an odd
> >> assembly error -- a capacitor marked 200 pf on one side and 160
> >> pf on the other. It should have been 160, but it was a 200
> >> causing incorrect behavior subtle enough that I didn't notice
> >> until I was calibrating by the manual. This was an 8555A,
> >> probably built in about 1974 with the wrong part!
> >>
> >> It's quite possible a TL610 was accidentally substituted for a
> >> '601, which would keep the reference of the following opamp
> >> (U38?) from being properly grounded. But it may be grounded by
> >> the input impedance of the '610 part or something that may cause
> >> it to miss some spec (or not) but was never noticed by users.
> >
> > That's plausible.  One of my 11848As was built with the wrong
regulator --
> > as I recall, they used an adjustable LM338K-style part where a fixed
> > 12-volt
> > regulator was called for (or vice versa, I don't remember now).  By
> > coincidence the output voltage was almost correct, enabling the unit to
> > work
> > unless you turned on an oscillator that drew enough current to load down
> > the
> > supply.  The factory test procedure evidently wasn't comprehensive
enough
> > to
> > trigger the failure.
> >
> > That was a really hard problem to find.
> >
> > -- john, KE5FX
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

When I was bulding spacecraft payloads, there was an axiom:

You CANNOT inspect in quality.

-John

===========



>> Even in the "good ole days" there were mixups. I have found typos
>> and such on schematics and other documentation, as well as an odd
>> assembly error -- a capacitor marked 200 pf on one side and 160
>> pf on the other. It should have been 160, but it was a 200
>> causing incorrect behavior subtle enough that I didn't notice
>> until I was calibrating by the manual. This was an 8555A,
>> probably built in about 1974 with the wrong part!
>>
>> It's quite possible a TL610 was accidentally substituted for a
>> '601, which would keep the reference of the following opamp
>> (U38?) from being properly grounded. But it may be grounded by
>> the input impedance of the '610 part or something that may cause
>> it to miss some spec (or not) but was never noticed by users.
>
> That's plausible.  One of my 11848As was built with the wrong regulator --
> as I recall, they used an adjustable LM338K-style part where a fixed
> 12-volt
> regulator was called for (or vice versa, I don't remember now).  By
> coincidence the output voltage was almost correct, enabling the unit to
> work
> unless you turned on an oscillator that drew enough current to load down
> the
> supply.  The factory test procedure evidently wasn't comprehensive enough
> to
> trigger the failure.
>
> That was a really hard problem to find.
>
> -- john, KE5FX
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

> Even in the "good ole days" there were mixups. I have found typos
> and such on schematics and other documentation, as well as an odd
> assembly error -- a capacitor marked 200 pf on one side and 160
> pf on the other. It should have been 160, but it was a 200
> causing incorrect behavior subtle enough that I didn't notice
> until I was calibrating by the manual. This was an 8555A,
> probably built in about 1974 with the wrong part!
>
> It's quite possible a TL610 was accidentally substituted for a
> '601, which would keep the reference of the following opamp
> (U38?) from being properly grounded. But it may be grounded by
> the input impedance of the '610 part or something that may cause
> it to miss some spec (or not) but was never noticed by users.

That's plausible.  One of my 11848As was built with the wrong regulator --
as I recall, they used an adjustable LM338K-style part where a fixed 12-volt
regulator was called for (or vice versa, I don't remember now).  By
coincidence the output voltage was almost correct, enabling the unit to work
unless you turned on an oscillator that drew enough current to load down the
supply.  The factory test procedure evidently wasn't comprehensive enough to
trigger the failure.

That was a really hard problem to find.

-- john, KE5FX

>
> Rarely do I have the need to generate triangle or square waves and
> I  have a Wavetek 288 that can do both. Unfortunately it has a persistent
> error  I haven't been able to fix yet (ERR OFST GAIN). While that's
> driving me  crazy, it works well enough for those rare situations.
>
> -----------
> Have you got the service manual? it's on Didier's site at.....
>

>
> regards
>
> Nigel
> GM8PZR
>

Yeah, I already have that service manual.  This error says to check
the motherboard, output board and phase lock board.  Gee, thanks
Wavetek, why not just say "Check instrument for problems"!  Would it
have killed them to say that this test checks the voltages at these
points, expects them to be in such and such range, and prints this
error if not? Nah, that would actually be helpful.  I guess I
shouldn't complain -- at least there are schematics available.
More modern gear seems to be nearly unrepairable.

I've already asked on the Wavetek group about this problem and either
no one owns the 288, or this is a rare error.  I guess I'll need
to dig into the schematics and guess at what the processor is
doing to fix this.

Anyway, back to bargain hunting HP test gear!

Scott