开云体育

Hi,

I am repairing a 5342A counter that has a bad A14 processor card. I have traced the problem
to the CPU board by trading cards with a known good unit.

Are there any common failure modes with this processor assembly? EG CPU failure, ROM
failure? The processor is a socketed MC6800L and there are three soldered ROMs.
Is there anything special about the "L" revision of the 6800 other than the ceramic/gold
package?

Thanks in advance,

JIm N8ECI

Looking for this or other similar limiter to protect my 8555A first mixer from damage.
Cheers, and thanks!...........................Don Collie jnr.

P.S. : my email is : donmer@...

That's a good point... or an HP 1332A display might work as well,
considering that's where the 85662A's CRT was originally employed.

You can also use SSM () with any
8566/8568, if a laptop or other PC is handy. It will lock out the
analyzer's keyboard while it runs, though. Definitely not a great
substitute for a working CRT.

As far as rejuvenation goes, I just added another 'case history' to
the page at which (so far, at least) has
worked as well as the first one did. See the correspondence near the
bottom.

-- john, KE5FX


--- In hp_agilent_equipment@..., k6yaz@... wrote:

The display on my 8568B has been weak since I purchased it. I

usually use an

external Tektronix X, Y, Z display. Because the 8568B generates it's

own

graticule, the display is accurate.

This may not be a great answer to the problem, but it's an inexpensive
solution to using the instrument.

Stuart K6YAZ
Los Angeles

The display on my 8568B has been weak since I purchased it. I usually use an
external Tektronix X, Y, Z display. Because the 8568B generates it's own
graticule, the display is accurate.

This may not be a great answer to the problem, but it's an inexpensive
solution to using the instrument.

Stuart K6YAZ
Los Angeles

I just found the following on Usenet from BAMA's owner.
It seems that storage is becoming a problem for him. I'm
posting this to all four groups I subscribe to because it
could potentially affect anyone who's searching for
documentation on older gear.

That is not as a result of storage limitations, it is due to the site owner
changing jobs and losing access to a super-fast internet connection. So he
can't tear submissions off, reformat them and upload. As I understand it,
this is temporary - but in the meantime he is handling his own bandwidth
limitation by restricting the site to non-test-equipment uploads.

Craig

Fellow techies in all groups (that I subscribe to),

I just found the following on Usenet from BAMA's owner. It seems that storage is becoming a problem for him. I'm posting this to all four groups I subscribe to because it could potentially affect anyone who's searching for documentation on older gear.


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?"

You can play with the INT LIMIT control on the Z-axis board, but it will probably not help much. That is a classic weak-CRT symptom. Does it look like the first photo at ?

-- john, KE5FX

--- In hp_agilent_equipment@..., "david_woodhead"
<david_woodhead@...> wrote:

Just acquired an 8568B and have questions....

The graticule is a little out of focus and appears to be over
intensified. The trace and on screen characters are very crisp.

When I

turn down the intensity, the graticule is visible long after the

trace

and text have vanished.

Are there seperate intensity commands for the trace and characters?

I also note that trace B is considerably dimmer than trace A. Is

there

an adjustment for trace B intensity?

Hoping this is not a CRT problem.

David.

Here's a little more info:

The front panel command to intensify the graticule for photography
works but all I see is the graticule. It completely dims text and
traces. Perhaps my problem is that text and traces are much dimmer
than they should be and the graticule intensity is working correctly.

The manual is not the easiest thing to understand so I'd appreciate
any input?

Thanks,

David.

Hi Group,
I`d like to obtain one first mixer for my new/old
H/P 8555A plug - in for my 141T Spec/An. Does anyone have one that they don`t want? Ideally, I`d like
a fully working one, but non - working would be OK
too.
[The H/P part number is : 5086 - 7177]

Thanking you!.................................Don Collie jnr.

P.S. : My email is : donmer@...

Just acquired an 8568B and have questions....

The graticule is a little out of focus and appears to be over
intensified. The trace and on screen characters are very crisp. When I
turn down the intensity, the graticule is visible long after the trace
and text have vanished.

Are there seperate intensity commands for the trace and characters?

I also note that trace B is considerably dimmer than trace A. Is there
an adjustment for trace B intensity?

Hoping this is not a CRT problem.

David.

make shure that all the screws holding the pcb's are tighten, most of the grounds are closed thru the screws and the chasis.

Hi Mike,

I have a paper set now. It is the other guy that needs
a set.

-Chuck

Dr M J DiGirolamo wrote:

Dear list members,

I own a 3325A, a nice function generator, however it has an
intermittent fault, it resets sometimes, usually it does that during
warmup, but once in a while it also resets after a few hours. I have
this generator for several years and tried to fix the problem. I first
checked the PSU, replaced all caps, resoldered all power transistors
of the PSU, replaced all caps on the CPU/logic board, replaced the DIP
switch on the CPU board, replaced the 3 flex strips with new solid
flexcable.

I have run out of ideas, but suspect that the cause is the nano
processor ??, any ideas would be welcome,

Thanks,

Fred, PE1FBO

Hi Chuck,

I have a set on microfish. Do you have a reader?

73,

Mike, W4XN
-----------------

Hi Glenn,

Yes I did! I paid something over $350USD for a set of 8505A originals.
They come in three, 3 inch, 3-ring binders, and about 50% of the
pages are fold out schematics. Each binder is packed beyond full
to overflowing with pages.... there are probably over 1200 pages
(double sided) in all.

The best bet is to do a google, and buy one of the reprinted sets
for around $200. It will cost you that much at Kinko's to make a copy.

-Chuck Harris

glenn_briceno wrote:

Hi Chuck,

I just picked up an 8505A myself. Did you ever get a copy of the
manuals for your analyzer? I'm looking for a set myself.

-Glenn

--- In hp_agilent_equipment@..., "chuck_585a"
<cfharris@...> wrote:

Hi,

I am trying to locate a set of manuals for my 8505A network analyzer
system.

I need:

HP8505A Opt 5,7 (3 volume set)
HP8501A
HP8503A Opt 1

I have found some or all from the various manual merchants,
but the prices are outrageous! $500 bucks seems to me to
be a bit excessive.

Does anybody have a set I could buy, borrow, or rent?

Thanks!

Chuck Harris

Hi Anand,
If you go to the Agilent website ( ) and do a
Search on "8924", you will see a download for the "8924C/E Assembly
Level Repair Manual". On the left-hand side of Page 471, of this
manual, I believe there is a cable pin-out of the 0950-2952 power
supply, including expected voltages. It's not the schematic, but
perhaps it's better than troubleshooting the power supply blindly.
Regards,
Matt

--- In hp_agilent_equipment@..., "ANAND KP"
<anandkp63@...> wrote:

Hi

I am on the lookout for HP 0950-2952 Power supply Schematics.


thanks in advance


Anand

--- In hp_agilent_equipment@..., Geoff Blake <geoff@...>
wrote:

On Fri, 15 Dec 2006, Didier Juges wrote:

I put the T in series with the output of the transmitter (between

the Tx

and the antenna or the load (better)) and the standalone BNC goes

to the

counter through another BNC cable. If you want to, you can simply

cut a

BNC cable somewhere in the middle and put the resistor in series with
the center conductor. Adjust the resistor value to provide the right
attenuation, i.e. to get 5 mW into the counter, which should be safe,
from a 50W Tx, you need 40dB of attenuation, which is a ratio of

100 in

voltage. If the counter has 50 ohm input, you put a 5k resistor in
series and you are done.

I use the same setup to inject a low level signal from a signal
generator into the RF input of a receiver for instance.

Good luck es 73,

Didier KO4BB

Didier, this is fine providing that 1) the 5K resistor is at the
T-piece end, and 2) from the non T-piece end of the 5K resistor,
you put a ~50 ohm resistor from the resistor/centre conductor to
the screen. This to give some sort of match to the cable,
otherwise, at some frequency it will be a 1/4 wave and can cause
strange effects. Using normal 6ft(ish) test leads, that is around
10 metres!

Of course 3/4 or 5/4 wave etc. will ahve similar effects.

Been there, done that.

Geoff
--

This is correct, but as long as the cable is matched at least at one
end, that will be fine. His counter only goes to 50MHz, so Gene would
not have problems if he were using MY test leads, which tend to be a
lot shorter than 6 feet :-)

My test cable has about 4" of cable between the T piece and the
resistor, that's good through VHF at least.

Now, the counter that Gene is using I believe does not have a 50 ohm
input, so he would need a 50 ohm pass-thru termination at the counter
end, or a 50 ohm resistor on the counter side of the 5k resistor.

Alternately, he can build a full 40 dB PI attenuator like the one
described in my MFJ-264 modification (2.7 k and 56 ohm resistors), and
match the cable at the other end, then cable length does not matter as
much.



Didier KO4BB

On Fri, 15 Dec 2006, Didier Juges wrote:

I put the T in series with the output of the transmitter (between the Tx
and the antenna or the load (better)) and the standalone BNC goes to the
counter through another BNC cable. If you want to, you can simply cut a
BNC cable somewhere in the middle and put the resistor in series with
the center conductor. Adjust the resistor value to provide the right
attenuation, i.e. to get 5 mW into the counter, which should be safe,
from a 50W Tx, you need 40dB of attenuation, which is a ratio of 100 in
voltage. If the counter has 50 ohm input, you put a 5k resistor in
series and you are done.

I use the same setup to inject a low level signal from a signal
generator into the RF input of a receiver for instance.

Good luck es 73,

Didier KO4BB

Didier, this is fine providing that 1) the 5K resistor is at the
T-piece end, and 2) from the non T-piece end of the 5K resistor,
you put a ~50 ohm resistor from the resistor/centre conductor to
the screen. This to give some sort of match to the cable,
otherwise, at some frequency it will be a 1/4 wave and can cause
strange effects. Using normal 6ft(ish) test leads, that is around
10 metres!

Of course 3/4 or 5/4 wave etc. will ahve similar effects.

Been there, done that.

Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff (at) palaemon (dot) co (dot) uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms

Please avoid sending me Word or PowerPoint attachments.
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W???QFC wrote:

Happy Holidays to all list members!

Again, I must call for help from this great group.
I want to use my 5302A to measure the frequency of a high power transmitter (50 watts +), so how would this be done?
Would I construct some sort of 'RF pick-up loop and if so, how would I do it?
As always, I really appreciate the help.

73,

Gene, W???QFC (OK on QRZ)
Spring Hill, Florida 34606
WEB SITE:

Gene,

Check

It uses a common T BNC connector adapter, a short piece of coax cable with a BNC plug, a resistor and a BNC socket.

I put the T in series with the output of the transmitter (between the Tx and the antenna or the load (better)) and the standalone BNC goes to the counter through another BNC cable. If you want to, you can simply cut a BNC cable somewhere in the middle and put the resistor in series with the center conductor. Adjust the resistor value to provide the right attenuation, i.e. to get 5 mW into the counter, which should be safe, from a 50W Tx, you need 40dB of attenuation, which is a ratio of 100 in voltage. If the counter has 50 ohm input, you put a 5k resistor in series and you are done.

I use the same setup to inject a low level signal from a signal generator into the RF input of a receiver for instance.

Good luck es 73,

Didier KO4BB