¿ªÔÆÌåÓý

Date

Re: Emailing: 410C calibration adjustments [OP-Amp]

Jos Raven
 

Hi Don,

If you attached the 410C calibration adjustments [OP-Amp] to the Yahoo group
It will not pass to us.

Could you mail it to this; jos.raven@...

73's
Jos
PA0amx

At 11:16 10-1-2007 +1300, you wrote:
Here`s the info, guys. I have both the op-amp, and photochopper version
manuals, so
if you want more info, it`s there. My 410C
uses the photochopper, but it works well, so I haven`t modified that part of
it. I put a 3 terminal regulator for the 6.0/6.3 Volt EA53
heater. This reduced the "zero drift" quite a bit.
Cheers all!.........................................Don C.



The message is ready to be sent with the following file or link attachments:
410C

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Yahoo! Groups Links



Re: SWR Meter 415E manual

Gary Beech
 

Hi Mike G6NCE,
I also been looking for the HP415E manuals, would it be possible to
email them to me at
garybeech@...


thank you

73's Gary VK2KYP

________________________________

From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of
thermionicguru
Sent: Tuesday, 9 January 2007 9:21 AM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: SWR Meter 415E manual



Hi Rasputin,
I've sent the required manuals to you at your email.
Let me know if you got them ok!
Best regards.
Mike G6NCE
--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> , Rasputin Novgorod
<priapulus@...> wrote:

Hi all:

I'm looking for the manuals for the HP 415E SWR Meter.
I expect Logsa has them, but I can't access there anymore
(from Canada).

I'd be grateful if someone could forward them to me, or
tell me where to go (to find them...). Send to:
Blair(at)Amtelecom.net
Replace (at) with @.

Sincerely,
Blair VBE3CZY

TM 9-4931-321-34P Direct Support and General Support Maintenance
Repair
Parts and Special Tools Lists Standing Wave Ratio Meter,
Hewlett-Packard model Y10-415E (NSN 6625-00-815-6273)

TB 9-4931-321-35 Calibration Procedure for Standing Wave Ratio meter
Hewlett-Packard model 415E and PRD model 277D

00415-90009 SWR Meter 415E covers serial prefix 0990A- and with
Appendix II Manual changes covers 719-, 545- and 530-. The Yellow
Manual Changes sheets dated 3 February 1986 have changes for: 1143A,
1709A, 1750A, 2031A, 2433A, 2507A, 2547A and 2509A.
But 2709A is too new for these changes.


__________________________________________________
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Tired of spam? Yahoo! Mail has the best spam protection around
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The information contained in this e-mail message and any accompanying files is or may be confidential. If you are not the intended recipient, any use, dissemination, reliance, forwarding, printing or copying of this e-mail or any attached files is unauthorised. This e-mail is subject to copyright. No part of it should be reproduced, adapted or communicated without the written consent of the copyright owner. If you have received this e-mail in error please advise the sender immediately by return e-mail or telephone and delete all copies. Fairfax does not guarantee the accuracy or completeness of any information contained in this e-mail or attached files. Internet communications are not secure, therefore Fairfax does not accept legal responsibility for the contents of this message or attached files.


Re: SERVICE MANUAL SUPPLEMENT for the 54111D

 

--- In hp_agilent_equipment@..., John Day <johnday@...>
wrote:

At 01:54 PM 1/4/2007, you wrote:

SERVICE MANUAL SUPPLEMENT for the 54111D, P/N 54111-90901

It would be nice if Mike Kawasaki could organize for this
supplement
which contains all the board level schematics to be uploaded on the
Agilent site. This will really help to keep these fine instruments
going.

Thanks, Dean
The full service manual with supplement is available from
'artekmedia' (David is a member of this group) on eBay. I have a
copy, yes, it is well worth it.

John
I ordered this from Dave and just want to confirm that the quality is
excellent. It includes all the schematics except the input pods. Good
work Dave!

Dean


Re: Getting 8505A working

 

J Forster wrote:
"rovmkr" <bunge@...> wrote:
The HP cables to connect the S parameter set appear to be a matched set.
Mine came from eBay about three years ago (for a couple of hundred
dollars as I remember). Before that, I used 0.141" hard line "U"s with
SMA connectors and SMA (F) to N (M) adapters. I can't say there was any
noticable difference when the authentic cables were installed, but my
system has the storage normalizer.
-John
The HP cables are matched for length. It isn't all that critical in actual
practice. I use a set of RG313 jumper cables I got from The RF Connection.
They came from some surplus assembly, and Joel had a bunch, so I used my
HP8505A to match them for delay.

At some point, I may swap them out for some 250 rigid, but for now, I can't
see any real reason to bother... it is only 1300MHz, after all.

-Chuck Harris


Re: Getting 8505A working

J Forster
 

"rovmkr" <bunge@...> wrote:

Thanks Bruce, the Digi Key states the inner connection is soldered
and the shield can be soldered or crimped. Since the hardest to
solder is the center then it should not be a problem. I have ordered
RG316/U cable from Ebay for $9 plus $5 shipping.

On another subject is the cables from the S-parameter test set to the
source/converter. Have you any idea what HP used? I was thinking
Andrews Antenna FSJ-50 which is semi rigid but it would be an extreme
bend radius. RG214 also comes to mind but I will have to look up what
it is like at 1.3GigHz. The HP cables look thinner than RG214.
Cheers, Peter.


The HP cables to connect the S parameter set appear to be a matched set.
Mine came from eBay about three years ago (for a couple of hundred
dollars as I remember). Before that, I used 0.141" hard line "U"s with
SMA connectors and SMA (F) to N (M) adapters. I can't say there was any
noticable difference when the authentic cables were installed, but my
system has the storage normalizer.

-John


Emailing: 410C calibration adjustments [OP-Amp]

Don Collie
 

Here`s the info, guys. I have both the op-amp, and photochopper version
manuals, so
if you want more info, it`s there. My 410C
uses the photochopper, but it works well, so I haven`t modified that part of
it. I put a 3 terminal regulator for the 6.0/6.3 Volt EA53
heater. This reduced the "zero drift" quite a bit.
Cheers all!.........................................Don C.



The message is ready to be sent with the following file or link attachments:
410C calibration adjustments [OP-Amp]

Note: To protect against computer viruses, e-mail programs may prevent
sending or receiving certain types of file attachments. Check your e-mail
security settings to determine how attachments are handled.


Re: Getting 8505A working

 

Keep in mind that you will probably also need to invest in the
correct crimping tools, since the contacts for the mixed-type D-subs
are considered mil-spec. Such tooling, though a bit pricey if bought
new (probably around $300), has the advantage that it can be used on
a variety of contacts, and the tools themselves are built very well
indeed. This makes them a pretty decent investment no matter where
you get them.

The catalog pages for the specific connectors should list the
tool and positioner types you'll need. If not, drop me a note and
I'll look up the numbers for you.

Keep the peace(es).




-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies --
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"

Thanks Bruce, the Digi Key states the inner connection is soldered
and the shield can be soldered or crimped. Since the hardest to
solder is the center then it should not be a problem. I have ordered
RG316/U cable from Ebay for $9 plus $5 shipping.
On another subject is the cables from the S-parameter test set to the
source/converter. Have you any idea what HP used? I was thinking
Andrews Antenna FSJ-50 which is semi rigid but it would be an extreme
bend radius. RG214 also comes to mind but I will have to look up what
it is like at 1.3GigHz. The HP cables look thinner than RG214.
Cheers, Peter.


Off topic [sorry] : MESSEMPFANGER [ESU 2]

Don Collie
 

I tried Rohde & Schwarz for schematics for this VHF/UHF test receiver, but they replied that they "stopped the repair of this equipment 10 years ago", and that "repair for the ESU 2 is no longer possible".
Can anybody suggest where I might be able to find schematics? I have the interconnection schematics for the modules, but no schematics of the modules themselves.
Any help here would REALLY be appreciated, because repairing this beastie without service data is much more difficult than with...........................................Don C.


Re: HP410C CHOPPER FREQUENCY SETTINGS FOR 50Hz LINE ? ...FIXED!!

Don Collie
 

Hi Andreas,
Email me off group, please, I have the information you want.
Cheers,........................................................Don C.

----- Original Message -----
From: Andreas Terbrack
To: hp_agilent_equipment@...
Sent: Wednesday, January 10, 2007 7:10 AM
Subject: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS FOR 50Hz LINE ? ...FIXED!!



Hi all,

I recently aquired a 410C, after difficulties to calibrate the AC
Range properly (and a very hot Probe) I discovered a 2-01C tube in my
Multimeter - running on 6.2 Volts. Funny enough my 410C is the later
Dual-FET / OpAmp version ...

After messing around with resistors for the filament, I changed
the 6.2V Zener for a 5.1V on the supply board: Zero is nearly stable
now and the AC tracks almost linear ... but still not 100%

Btw: Can somebody be so kind and forward me the Balance/Gain
calibration procedure for the FET/OpAmp 410c ?

Cheers,

Andreas

"Don Collie" <donmer@...> wrote:
>
>
> ----- Original Message -----
> From: Don Collie
> To: hp_agilent_equipment@...
> Sent: Tuesday, September 05, 2006 5:17 PM
> Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY
SETTINGS FOR 50Hz LINE ? ...FIXED!!
>
>
> I think that a 410B probe will work OK when connected to a 410C
Multimeter - the citcuit is similar in both units, with the meter side
being very high input resistance. As to altering the probe itself :
I`d want to check its calibration
> with a levelled Signal Generator, over all the range of
frequencies. After all, the thing will measure AC Voltage from 50Hz to
over 500MHz - that`s seven decades! I haven`t got a 410B probe handy,
but my 410C probe has a special discoidal [?] decoupling capacitor in
the probe head, and H/P wouldn`t do this if it wasn`t necessary. Wheat
and Chaff.
> Cheers!.........................................Don Collie
>
>
> ----- Original Message -----
> From: JOS Earthlink
> To: hp_agilent_equipment@...
> Sent: Saturday, September 02, 2006 2:24 AM
> Subject: RE: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY
SETTINGS FOR 50Hz LINE ? ...FIXED!!
>
>
> Hi Chuck,
>
> I recall hearing that some of the early 410C used the 2-01C as
in the 410B
> and these run at 5v. Do you have any info on that? I also recall
that the
> 410C has no adjustment for the filament voltage while the 410B
did have this
> adjustment. Since it seems there are more 410B HV probes
available than
> 410C, any easy way to adjust the 410C to use a 410B 2-01C probe?
> 73 Jerry
> K1JOS
>
> -----Original Message-----
> From: hp_agilent_equipment@...
> [mailto:hp_agilent_equipment@...]On Behalf Of Chuck
Harris
> Sent: Thursday, August 31, 2006 7:11 AM
> To: hp_agilent_equipment@...
> Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY
SETTINGS
> FOR 50Hz LINE ? ...FIXED!!
>
> hpxref wrote:
>
> > Now, does anyone know if the fil supply should be 5v or 6 v?
> > (for S/N 550-06965)
> > I would like to know before starting a complete CAL bench check
>
> There is no controversy here, all 410C's are 6VDC filament for the
> 12AT7, and 6.3V unregulated AC for the probe.
>
> -Chuck Harris
>
>
>
>
>
>
>
>
>
----------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.405 / Virus Database: 268.11.7/436 - Release Date:
01-Sep-06
>
>
>
>






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Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.16.8/621 - Release Date: 1/9/2007 1:37 PM


Re: spectrum analyzer 1st mixer

 

Hi,

I am not familiar with the exact part in question, but very often,
spectrum analyzer mixers are of the double balanced diode type (DBM).

When working correctly, a DBM provides at least 20dB of isolation between
the LO, RF, and IF ports. So, when you move the LO towards the low end
of the band, like you are doing at 10MHz, the LO, and IF are approaching
each other in frequency, until you hit zero (DC) Hz, where they are exactly
the same frequency. If the DBM is working correctly, it will provide you
with more than a 20DB isolation between the IF, and LO ports, which will
reduce the amount of LO that goes right into the IF port by at least 20dB.

However, if the DBM has a burned out diode, it will no longer give you
much, if any, isolation between the IF and LO ports, and you will see
a drastically larger amount of LO signal being stuffed into the IF port.
This cannot help but wreck the amplitude flatness at the low end of the
band. At the high end of the band, this lack of isolation goes all but
unnoticed because the IF filters are sufficiently steep to keep the LO
signal out of the IF port.

-Chuck Harris

ericapple2004 wrote:

Hello , While the spectrumanalyzer pro-and contra's are actual on this group,
may be someone can help with this:
My 70904A RF module (HP70100 analyzer) works perfectly from 10 MHz to
2.9 GHz , however below 10 MHz amplitude flatness goes down rapidly ,
-20 dB at 1 MHz . Manual says problem with 1st mixer ??
I have difficulty to understand that the mixer can be shot and at the
same time performing above 10 MHz without problem ?
Basic layout of the first stages are : 0-70 dB attenuator ,
switchable AC -DC , then limiter 10 mW dc-3GHz , then 1st mixer ...
I would guess a series resistor burned out , becoming a nice series
capacitor that way ??
Any suggestions for repair ? Thanks Erik Belgium
PS . Other people using HP 70000 mms equipment on this group ,I like
to share experience ?


Re: spectrum analyzer 1st mixer

 

At 22.03 09/01/2007, Erik wrote:

Hello ,
While the spectrumanalyzer pro-and contra's are actual on this group,
may be someone can help with this:
My 70904A RF module (HP70100 analyzer) works perfectly from 10 MHz to
2.9 GHz , however below 10 MHz amplitude flatness goes down rapidly ,
-20 dB at 1 MHz .
Manual says problem with 1st mixer ??
I have difficulty to understand that the mixer can be shot and at the
same time performing above 10 MHz without problem ?

Basic layout of the first stages are : 0-70 dB attenuator ,
switchable AC -DC , then limiter 10 mW dc-3GHz , then 1st mixer ...

I would guess a series resistor burned out , becoming a nice series
capacitor that way ??

Any suggestions for repair ? Thanks Erik Belgium

PS . Other people using HP 70000 mms equipment on this group ,I like
to share experience ?
Erik,

most probably an open capacitor, or a defective connector. Try skipping all the components before the mixer, and inject a -40dBm signal directly to the mixer; you will find if the problem is in the mixer or before it (most suspect: the AC/DC switch or the limiter).

73 - Marco IK1ODO


spectrum analyzer 1st mixer

 

Hello ,
While the spectrumanalyzer pro-and contra's are actual on this group,
may be someone can help with this:
My 70904A RF module (HP70100 analyzer) works perfectly from 10 MHz to
2.9 GHz , however below 10 MHz amplitude flatness goes down rapidly ,
-20 dB at 1 MHz .
Manual says problem with 1st mixer ??
I have difficulty to understand that the mixer can be shot and at the
same time performing above 10 MHz without problem ?

Basic layout of the first stages are : 0-70 dB attenuator ,
switchable AC -DC , then limiter 10 mW dc-3GHz , then 1st mixer ...

I would guess a series resistor burned out , becoming a nice series
capacitor that way ??

Any suggestions for repair ? Thanks Erik Belgium

PS . Other people using HP 70000 mms equipment on this group ,I like
to share experience ?


Re: HP410C CHOPPER FREQUENCY SETTINGS FOR 50Hz LINE ? ...FIXED!!

 

Hi all,

I recently aquired a 410C, after difficulties to calibrate the AC
Range properly (and a very hot Probe) I discovered a 2-01C tube in my
Multimeter - running on 6.2 Volts. Funny enough my 410C is the later
Dual-FET / OpAmp version ...

After messing around with resistors for the filament, I changed
the 6.2V Zener for a 5.1V on the supply board: Zero is nearly stable
now and the AC tracks almost linear ... but still not 100%

Btw: Can somebody be so kind and forward me the Balance/Gain
calibration procedure for the FET/OpAmp 410c ?

Cheers,

Andreas

"Don Collie" <donmer@...> wrote:


----- Original Message -----
From: Don Collie
To: hp_agilent_equipment@...
Sent: Tuesday, September 05, 2006 5:17 PM
Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY
SETTINGS FOR 50Hz LINE ? ...FIXED!!


I think that a 410B probe will work OK when connected to a 410C
Multimeter - the citcuit is similar in both units, with the meter side
being very high input resistance. As to altering the probe itself :
I`d want to check its calibration
with a levelled Signal Generator, over all the range of
frequencies. After all, the thing will measure AC Voltage from 50Hz to
over 500MHz - that`s seven decades! I haven`t got a 410B probe handy,
but my 410C probe has a special discoidal [?] decoupling capacitor in
the probe head, and H/P wouldn`t do this if it wasn`t necessary. Wheat
and Chaff.
Cheers!.........................................Don Collie


----- Original Message -----
From: JOS Earthlink
To: hp_agilent_equipment@...
Sent: Saturday, September 02, 2006 2:24 AM
Subject: RE: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY
SETTINGS FOR 50Hz LINE ? ...FIXED!!


Hi Chuck,

I recall hearing that some of the early 410C used the 2-01C as
in the 410B
and these run at 5v. Do you have any info on that? I also recall
that the
410C has no adjustment for the filament voltage while the 410B
did have this
adjustment. Since it seems there are more 410B HV probes
available than
410C, any easy way to adjust the 410C to use a 410B 2-01C probe?
73 Jerry
K1JOS

-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]On Behalf Of Chuck
Harris
Sent: Thursday, August 31, 2006 7:11 AM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY
SETTINGS
FOR 50Hz LINE ? ...FIXED!!

hpxref wrote:

> Now, does anyone know if the fil supply should be 5v or 6 v?
> (for S/N 550-06965)
> I would like to know before starting a complete CAL bench check

There is no controversy here, all 410C's are 6VDC filament for the
12AT7, and 6.3V unregulated AC for the probe.

-Chuck Harris

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






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


No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.405 / Virus Database: 268.11.7/436 - Release Date:
01-Sep-06


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


Re: Getting 8505A working

 

Good day,

* REPLY SEPARATOR *

On 09-Jan-07 at 13:48 rovmkr wrote:

--- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@...>
wrote:
They are good analyzers. I had the same problem (no cables)to the
storage normalizer. To buy complete cables seemed quite expensive.
Ended getting the connector and special pins and making the cables.
Took about 1 hour to make 2 cable sets. The copper shield braiding
for the cable I got from a aircraft parts supplier. Worked
perfectly.

Dean
Thanks Dean, I found connectors at DigiKey by searching 24w7 - this
will take you to the page where the body and inserts are. I am in the
process of selecting the correct coax PINs (not sockets) but have to
find some coax first for the size. Do I need double shield, asuming it
is available in this size? Are any of the 17 non-coax wires in twisted
pairs or bundled in shielding? Any suggestion on the coax?
Keep in mind that you will probably also need to invest in the correct crimping tools, since the contacts for the mixed-type D-subs are considered mil-spec. Such tooling, though a bit pricey if bought new (probably around $300), has the advantage that it can be used on a variety of contacts, and the tools themselves are built very well indeed. This makes them a pretty decent investment no matter where you get them.

The catalog pages for the specific connectors should list the tool and positioner types you'll need. If not, drop me a note and I'll look up the numbers for you.

Keep the peace(es).




-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies --
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"


Re: Getting 8505A working

 

--- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@...>
wrote:
They are good analyzers. I had the same problem (no cables)to the
storage normalizer. To buy complete cables seemed quite expensive.
Ended getting the connector and special pins and making the cables.
Took about 1 hour to make 2 cable sets. The copper shield braiding
for the cable I got from a aircraft parts supplier. Worked
perfectly.

Dean
Thanks Dean, I found connectors at DigiKey by searching 24w7 - this
will take you to the page where the body and inserts are. I am in the
process of selecting the correct coax PINs (not sockets) but have to
find some coax first for the size. Do I need double shield, asuming it
is available in this size? Are any of the 17 non-coax wires in twisted
pairs or bundled in shielding? Any suggestion on the coax?


hp 86220a part

 

im looking for a replacement
translator module for an hp 86220a
plug in as used with an 8620 a or c sweeper
or possibly a junk plugin thsat might have a good module
the module is a rectangular metal box attached to the bottom of
the plug in
part # 5086-7003 "frequency translator"
their is a very similar module next to it that contains
the output amplifier.
the yig and cavity oscillator are ok "both measure over +10
db out the amp was checked with a -30 signal from my
8640b and it easily produced +10 out
i have the manual and its acting like the pin diode
modulator is shot "part of the mixer module"


hp 8175 fried resistor and missing cable

 

Just received from Ebay a 8170a as is that is missing a cable between
Video board and output board. I found a ribbon cable with plugs that
fit however need help with verifying correct pin out between boards.
Also power supply board has a 2 watt resister fried located next to
the smaller of two bridge rectifier near center of power supply board.
Could use help identifying resister and pin outs of cable or copy of
schematic if anyone mite have one I would be grateful.
Thanks T.O. ¡­¡­¡­¡­.. E-mail address is tloleksy@...


Re: SWR Meter 415E manual

 

Hi Rasputin,
I've sent the required manuals to you at your email.
Let me know if you got them ok!
Best regards.
Mike G6NCE
--- In hp_agilent_equipment@..., Rasputin Novgorod
<priapulus@...> wrote:

Hi all:

I'm looking for the manuals for the HP 415E SWR Meter.
I expect Logsa has them, but I can't access there anymore
(from Canada).

I'd be grateful if someone could forward them to me, or
tell me where to go (to find them...). Send to:
Blair(at)Amtelecom.net
Replace (at) with @.

Sincerely,
Blair VBE3CZY

TM 9-4931-321-34P Direct Support and General Support Maintenance Repair
Parts and Special Tools Lists Standing Wave Ratio Meter,
Hewlett-Packard model Y10-415E (NSN 6625-00-815-6273)

TB 9-4931-321-35 Calibration Procedure for Standing Wave Ratio meter
Hewlett-Packard model 415E and PRD model 277D

00415-90009 SWR Meter 415E covers serial prefix 0990A- and with
Appendix II Manual changes covers 719-, 545- and 530-. The Yellow
Manual Changes sheets dated 3 February 1986 have changes for: 1143A,
1709A, 1750A, 2031A, 2433A, 2507A, 2547A and 2509A.
But 2709A is too new for these changes.


__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around


Re: HP8920/A/B diagrams

 

--- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@...>
wrote:
"I often wonder if Agilent have component level diagrams for these
units? ..."
--------------------------------------------------------

Answers to a previous thread indicated that this information exists.


Re: HP8920/A/B diagrams

 

Suppose that they have some circuitry that infringes someone
else's patent. Then, they would have a lot to lose if they
released the the component level diagrams.

This is one of the reasons so many companies balk at the idea
of open source. If they open sourced their programs, everyone
could easily see the infringement issues.

-Chuck Harris

tunerwiz wrote:

I often wonder if Agilent have component level diagrams for these units? Surely there must be documentation because they used to repair faulty modules. Why not release this information as they are not interested in repairing units anymore? They have nothing to lose or do they? Maybe, the sale of a new current model? I fixed some units in the past by tracing out and comparing which is a very time consuming process.
Dean