¿ªÔÆÌåÓý

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Expanded Topics Messages
Date
Re: hp 8657A

[email protected]
 

Download the 8657A Service Manual from?, and use Service Sheet 16 to troubleshoot the problem.
Re: HP 8595E SYTF 5086-7803 PIN switch problem

 

...Another solution that I am considering is to buy a microwave SPDT switch (even SPST can do)
and put it between the attenuator and the input of YTF. For the high band the switch will pass the signal to the SYTF and
it does its job perfectly but for the low band the switch will divert the signal (pass through) directly to the dual mixer.
The biggest issues are generating compatible switching and power supply voltages from what is already on the A7 board
for that I will have to put is some transistors and stuff somewhere! and the next issue is where to mount the switch in the RF compartment.
There are some small spaces here and there and maybe I can squeeze it somewhere...

However, the type of the switch is critical. First I was looking at relay switches for example from Teledyne which have
extremely good specs and relatively cheap but then it struck me that the switching times must be very small compared to the sweep speeds of the SA
Relay switches are rated at 5ms-15ms switching times. The might work OK for most of the time but if it happens that your frequency span
covers the transition between low band and high band and the sweep time is in the range of 10's of ms then it becomes a mess...that's exactly why?
the HP designers only used PIN switches in all places in the RF section. Modern analyzers use GaAs FET switches. The switching times for PIN diode switches is?
around 5-20nsec but of ocurse the can never achieve the insertion loss and isolation specs of relay switches. not even close..

Now the only thing I have been able to find was Minicircuits ZYSW-2-50DR and ZYSWA-2-50DR with reasonable specs up to 3GHz and even applicable up to 5GHz but not to 6.5GHz as I need.

Any suggestion about a PIN diode RF switch that I can buy at reasonable price is welcome?
HP 8595E SYTF 5086-7803 PIN switch problem

 

I've got a 8595E which works perfectly fine in the high band but it's about 24-26dB down (almost flat) in the low band (9K-2.9G)
Long story short, by doing various measurement, I have confirmed that the PIN diode switch inside the SYTF when
switches to the low band is dead (exactly 24-26dB loss over the band) so it does not pass the signal through to the mixer
everything after the SYTF works fine when I directly inject low band signal. The YIG filter itself is of course fine, too.
It seems to me that the PIN diode in the shunt arm of the switch is shorted perhaps due to excessive input power. It also overloads the switch voltage
that comes from A7 board, instead of -9.8V it becomes -3.6V when that switch is supposed to close. But for eh other pole of the switch (high band) it is -9.8V as it should

Anyways, since I have never opened a SYTF or any YIG tuned stuff before
I have a couple of questions I was hoping someone on this forum can help me with:

1-what are my chances of repairing the switch and not messing up the YTF?

2-Are the switch and the YTF in two separate compartments? If I attempt to open it up
is there anything that might fall off and mess the whole thing up?

3-is the switch made of wire bonded microcircuit elements? I don't have access to any wire bonding stuff. Only my soldering iron!

thanks
Re: 8568B RF attenuator partial failure

 

On Sat, Feb 2, 2019 at 12:38 PM, Ed Breya wrote:
/g/HP-Agilent-Keysight-equipment/topic/28990892#93644
Thanks for the link! This looks like it should be fairly doable with some care.
Re: Help to fix power supply (A80) of an old HP 3586A

 

¿ªÔÆÌåÓý

For NiCad leakage (sodium or potassium Hydroxide do not remember which) you have an alkali causing the damage.
You need to neutralize the alkali.
This requires an acid.
A very good weak acid to use is white vinegar.
After you neutralize the alkali, then clean the board with distilled water.

You may need to use dental picks to spot remove or clean the copper hydroxide left from the leaking alkali.

In some cases you may need to repair the traces.
You can use wire or replace the traces.
Pace printed a very good repair manual based on the IPC for board repair and has available the different traces required to repair almost any board damage.

A good repair person can repair a board where you will have to look very close to see that it was repaired.

Using this search term "ipc printed circuit repair" you are provided with a number of places that have repair documents.? The one from intertronics is a ver good reference.

Glenn



On 2/3/2019 8:59 AM, cc@... wrote:
Hi,
I tried with simple green degreaser diluted with distilled water but after 12h I still notice the residues from the old battery. The old battery is a NiCd ... so is a normal degreaser enough to remove that green residues in your opinion?

Now I am going to try a second wash with the same degreaser but with a warm water and brushing. Below I highlight with red arrows some points:

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

Unknown Options 85680B

 

Hi,
I have the above mentioned SA with serial number 2445Axxxx. I had to part it with the display section becaused I want to trouble shoot a non functional HP-IB.
Looking to the backside the serial plate mentioned options 856 808. I have not found a clue in the manuals.
Any info is appreciated.

Regards
Ernst
Re: hp 8657A

 

¿ªÔÆÌåÓý

So what do the pictures of three boards mean?
These appear to be the same circuit board from three different instruments.

A little reference goes a long way.

Glenn

On 2/3/2019 12:00 PM, gianni vecchietti IK4EWH via Groups.Io wrote:
I forgotten PIC....... 

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

Re: hp 8657A

 

I ordered manual. Hope will be different from these I got already...!!
Re: hp 8657A

 

I forgotten PIC.......
New file uploaded to [email protected]

[email protected] Notification
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group.

File: HP54645A_EPROM_27C040.zip

Uploaded By: Askild

Description:
Firmware for HP 54645A version A.01.01

You can access this file at the URL:
/g/HP-Agilent-Keysight-equipment/files/54645A%20Firmware/HP54645A_EPROM_27C040.zip

Cheers,
The Groups.io Team
Re: HP8750A Storage Normalizer

 

Jeff

Do you still have a? 08750-00009 interface board available for the normalizer?? I have the cable and analyzer, but not the correct board.

Peter? k1zjh


?Spectrum Analyser Interface?A5 08750-60009 Board Assembly?
Re: HP 3490A repair

 

¿ªÔÆÌåÓý

Thanks for the Jim Williams wisdom Joel.
?
Chapter 2 is excellent too.
?
Repairing stuff is like doing a prize crossword but you get a big prize almost every time.
?
Regards,
Chris
Re: HP 3314A - experience

 

Never knew!!



:-)
Re: HP8160A & HP E1420B Wanted

 

¿ªÔÆÌåÓý

Hi Fred

How is my Rohde & Schwarz coming along

?

From: [email protected] [mailto:[email protected]] On Behalf Of MARC CHRISTIAN
Sent: 03 February 2019 16:45
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP8160A & HP E1420B Wanted

?

Dear Group - Looking To Buy HP8160A Pulse Generator & HP E1420B VXI Module if any Member has available.

?? Regards
?????? Marc Christian

No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.
Re: HP 3314A - experience

 

¿ªÔÆÌåÓý

Regarding ?HP 3314 exhalant bit of kit? ?it is also a VCO?

?

If you are repairing hp equipment of that generation you must get a HP signature analyzer

Infect most of use have at lest 2 as I typically pay ?10 at radio rallies

?

Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of amirb
Sent: 03 February 2019 12:58
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3314A - experience

?

very nice instrument with clean and precise waveforms

If I remember correctly there are 2 custom designed chips on the analog board and the rest?
one was the sine shaper I recall...they hardly fail really. the rest of the components are?
all through hole and can be found from various sources. even the custom chips show up on ebay.
in the two cases that I have repaired which were really old (~1982) the masked ROMs had failed plus the SRAMs
the masked ROMs (there were 6 of them containing the firmware) are those that are used in old Commodores (MK36000?)
so I had to make an adapter and fit in 28 pin EPROMs which is easy and the ROM images are available on internet.
The RAM chips I had to buy from china...

for troubleshooting the digital board having a signature analyzer (like Tektronix 308) is very very useful or even necessary.

the service manual is excellent


On Sun, Feb 3, 2019 at 05:51 AM, Tobias Pluess wrote:

Hi guys,
I saw a 3314A generator in very nice condition. The user says he has no way to test it. As usual :-)
I could use the 3314A's VCO and PLL capabilities. Besides that, it would come in handy as replacement for my old analog function generator.
So I wonder whether some people on the list have experience with the 3314A. Are there some common problems, are they easy to repair, or is it just a pile of unobtanium ASICs, etc.
If there are good chances for repair, I would even buy a possibly nonworking unit and repair it...

Tobias
HB9FSX


?On Sun, Feb 3, 2019 at 05:51 AM, Tobias Pluess wrote:

VCO and PLL

No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.
HP8160A & HP E1420B Wanted

 

Dear Group - Looking To Buy HP8160A Pulse Generator & HP E1420B VXI Module if any Member has available.

?? Regards
?????? Marc Christian
Re: HP 3314A - experience

 

and when you do get one, hook up a speaker to the output, hold down blue (shift), "SW/TR INTVL", and "START FREQ" buttons simultaneously, turn on power, then release the buttons and....Hellelujah!

Adrian

On 2/3/2019 2:54 PM, Artekmedia wrote:
Tobias

This unit is pretty much "off the shelf "(at the time) standard discrete IC's and transistors. I do not think there is any custom silicon in there although maybe some of the Siliconix switches and things like that might be hard to source these days. Beyond that electrolytics in power supply etc

Dave
manuals@...

On 2/3/2019 5:51 AM, Tobias Pluess wrote:
Hi guys,
I saw a 3314A generator in very nice condition. The user says he has no way to test it. As usual :-)
I could use the 3314A's VCO and PLL capabilities. Besides that, it would come in handy as replacement for my old analog function generator.
So I wonder whether some people on the list have experience with the 3314A. Are there some common problems, are they easy to repair, or is it just a pile of unobtanium ASICs, etc.
If there are good chances for repair, I would even buy a possibly nonworking unit and repair it...

Tobias
HB9FSX
Re: hp 8657A

 

Get a quality scan of the diagram for starters.

From your description I cant not tell which schematic you are looking at?



Ciao
Dave
NR1DX
manuals@...

On 2/3/2019 10:58 AM, gianni vecchietti IK4EWH via Groups.Io wrote:

Since the diagram I got is so small that need the microscope to see some things, but quality is low, so at end I can't see nothing!!!!
Some suggestions?
Thanking !!!!
gianni
--
Dave
Manuals@...
www.ArtekManuals.com
Re: hp 8657A

 

really I make confusion , but helped from HP mistak:
. On PIC 8657-1 can see the write under the connector. Seeing the letter , seem that the first letter can be a M.
On secon PIC 8657-2? without connector the letter are HHZ.....(???)
Comparing with PIC 8646-3 ( another generator but 8656) is clear that are KHZ. !!!!!
At end the situation is :
on OUT 100 KHz , there is nothing
on OUT 5 MHz? ? there is nothing? .....? ?but are 5 volt that came out? from module? ?
on other machine 8556 are 2 volt and also 5 MHz....
Since the diagram I got is so small that need the microscope to see some things, but quality is low, so at end I can't see nothing!!!!
Some suggestions?
Thanking !!!!
gianni
Re: HP 3314A - experience

 

Tobias

This unit is pretty much "off the shelf "(at the time) standard discrete IC's and transistors. I do not think there is any custom silicon in there although maybe some of the Siliconix switches and things like that might be hard to source these days. Beyond that electrolytics in power supply etc

Dave
manuals@...

On 2/3/2019 5:51 AM, Tobias Pluess wrote:
Hi guys,
I saw a 3314A generator in very nice condition. The user says he has no way to test it. As usual :-)
I could use the 3314A's VCO and PLL capabilities. Besides that, it would come in handy as replacement for my old analog function generator.
So I wonder whether some people on the list have experience with the 3314A. Are there some common problems, are they easy to repair, or is it just a pile of unobtanium ASICs, etc.
If there are good chances for repair, I would even buy a possibly nonworking unit and repair it...

Tobias
HB9FSX
--
Dave
Manuals@...
www.ArtekManuals.com
57201 - 57220 of 151291