¿ªÔÆÌåÓý

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Expanded Topics Messages
Date
Re: OFF TOPIC: MEGURO MAK-6610 Audio Analyzer Service Manual

 

Hi

Meguro merged with Keisoku some time ago.
You can contact them and try to ask for a copy of the service manual.
I have had good luck with japanese equipment.They were very kind.



Regards.
Re: 5343A troubles

 

Hi Daniel,

Check the power lines for ripple.
I have a HP 5351B dumpster find, that did not work to well, needed higher input level, and did not work on all frequencies...
It was missing one of the capacitors in the power supply, so lots of ripple.
After finding the missing cap, and putting in a new one, it behaved great.

Might not be your issue, but its an easy check..

BR,
Askild


On Fri, Apr 10, 2020 at 7:49 PM Daniel Sheen <danielsheen5@...> wrote:

Hi all,

?

I have a rather bizarre problem with a 5343A counter. Observed symptoms are that the high frequency input works reliably up to about 250MHz, reads garbage from around 250MHz-800MHz, and then seems to work fine from 800MHz upward through 1GHz (I only have an 8640B handy atm so can't really test higher than that). Cranking up the input power a bunch seems to reduce the dead band to closer to 400MHz-600MHz.

?

The counter initially failed troubleshooting step 4 in the service manual. That was resolved by replacing the A10 board (from another counter with a blown sampler). It now passes step 5 and is marginal on step 6 (sensitivity is a little lower than it ought to be but it seems to work).

?

The one other observation I've made is the IF amplitude into and out of A11 drops off rapidly if an input is tuned into the range of frequencies that it's insensitive to, but I'm struggling to find a plausible explanation for why that could occur given my understanding of the counter design (that wouldn't also make higher frequencies not be detected).

?

If anyone has any thoughts or has run into this before, suggestions would be appreciated.

?

Thanks,

Daniel, KC1EPN
Re: HP54603B Software Gremlins

 

Hi Andreas,

Yes, flash would be nice, but back when these where designed, that was not a good option for reliable long operation.

You could try to do what I did with the M48Z18 inside my HP 54645A scope.
I removed it from the PCB and put in a socket.
Looked at the IC, and it looked like an IC epoxied into a bigger housing.
So I heated it up and used a small screwdriver to pry the IC out of the epoxy.
The battery/batteries, it can be one or two on top of the IC. They where connected to the ends of the IC.
I just connected a new lithium battery to one side, see picture attached.

When dismantling, pay attention to where the + and - of the battery connects..

BR,
Askild


On Fri, Apr 10, 2020 at 12:45 PM Andreas Zilker via <dg7rbn=[email protected]> wrote:
Hi Askild,

thanks a lot for the clear and detailed pointer.
With "nonvolatile trace memory" mentioned in the manual, I thought of something
more durable (EEPROM, FlashROM) than a battery back-up SRAM :-) Would have
been nice, if the programmers had added some CRC or at least a checksum to the
data compression throwing an error message if something fails. At least they had
time for the famous "Tetris game" :-P
As the price tag for the M48Z128Y replacement from Maxim is in the $30 range,
(and then you dont't know how old it is already) I'm thinking of setting up a
"discrete" solution with a $3 128kSRAM, a coincell and 2 Schottky-Diodes
(or a DS1210).

Cheers??? Andreas

20190324_170726_r.jpg

OFF TOPIC: MEGURO MAK-6610 Audio Analyzer Service Manual

 

Hello guys,

About 4 years ago I got for cheap a non working Meguro MAK-6610 Audio Analyzer. I have since been desperately trying to find a service manual for it but no luck.

Do any of you happen to have it?

I'd be forever grateful!!! ?

Regards,

Bernard.
Re: Racks for older equipment

Leon Robinson
 

¿ªÔÆÌåÓý

HEIC is a high resolution photo format search for HEIC file converter.

HEIC is an Apple file format


Sent from K5JLR


-------- Original message --------
From: Daun Yeagley <daun@...>
Date: 04/10/2020 11:46 AM (GMT-06:00)
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Racks for older equipment


What is a ".HEIC" file?? I can't open it.

Daun

Daun E. Yeagley II, N8ASB
On 4/10/2020 12:05 PM, bownes wrote:
The other thing that works well is the wire rack rolling carts. They will hold a lot of weight and an outlet strip fits well behind the handle. I keep the gear on a set of wire rack shelves, roll the cart over, pull off what I need for a given exercise, roll the cart back to the bench, and off I go.

On Fri, Apr 10, 2020 at 9:08 AM ArtekManuals <manuals@...> wrote:
Wally
Depends on largely on
1) The size of the castors ( wheels), bigger wheels are generally easier
to deal with and actually less likely catch and tip
2) The floor surface they are rolling on

Weight? can be a factor, put? heavier on the bottom -Lighter on the top
) think low center of gravity
Though things have changed in my current set up and I have long since
abandoned the racks, you used to be able to find racks that were 36"?
high. I really like these if you have the room as the make great rolling
"table tops" with a power supply in the bottom

Dave
NR1DX

On 4/10/2020 7:09 AM, wallydoc via wrote:
> I have a bunch of old HP and other equipment and am using a Tek scope
> stand for some of it. I was wondering if anyone had any suggestions
> about rolling stands for TE, Do the rolling racks?that musicians use
> for their audio equipment work well enough? They are 19 inch racks.
> Any suggestions would be helpful.
>
> Wally KC9INK
>

--
Dave
Manuals@...



--
This email has been checked for viruses by Avast antivirus software.
HP cal/vfy software, RMB, etc, was Re: [HP-Agilent-Keysight-equipment] 4195A question

 

On 4/10/20 4:47 PM, Bruce wrote:
Be happy to help - lets talk off line.? I have a working 900/300
system with HPIB, basic and HP UX, needing only a color monitor (have
the B/G monitor).
Ok, thanks. I have a lot of HP/UX experience, but almost no knowledge
of the RMB systems so I'm starting cold there.

I've recently recovered (typed in, from an un-scannable listing!) the
HP 85867A EMI receiver software for the 8566/8568 spectrum analyzers.
I'm hoping to get that running; that was my original impetus to start
digging into the RMB stuff.

Do you have a favorite imaging software?? I've been using a program
called Omniflop - seems to archive just about any format I've run into.
Uh, that's for Windows I think. Does it store its image data in a
documented format? If not, you're asking for trouble.

Depending on the need, I use either HP's LIF utilities, ImageDisk, or
TeleDisk. The latter two use documented storage formats. I have a
dedicated system with the right floppy controller chip to handle most
format variations, set up for 3.5", 5.25", and 8" disks. It dual-boots
FreeDOS (for the floppy utilities) and Linux, and the Linux side can see
the FreeDOS filesystem for import/export of image data.

That system also handles 9-track magtapes IBM 3480 and 3490 tapes, and
DEC TK50/TK70 tapes. Media media everywhere.

Anyway, contact me off line for more discussion.
Ok. It will be awhile before I can get to this. I already had my
hands full before this weeks' damn tornado, now I've messes to clean up
on top of that.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Seeking advice on a precision DVM

 

Opps, I have to correct my statement about the lowest resistance range for the Keithley 2000 and the integra 2700, 2701 models. The only model in that line providing 1 (and 10) ohm ranges is the 2750, which is not as common on the auction site and probably not priced competitively (it is also a full size form factor).

But even with 100 Ohms as the lowest range, I highly recommend the 2000 and it's sisters. Just be careful that you don't buy one with a dim display!
Re: 4195A question

 

Be happy to help - lets talk off line. I have a working 900/300
system with HPIB, basic and HP UX, needing only a color monitor (have
the B/G monitor).

Do you have a favorite imaging software? I've been using a program
called Omniflop - seems to archive just about any format I've run into.

Anyway, contact me off line for more discussion.

Cheers!

Bruce K9BC
bruce@...



H

Quoting Dave McGuire <mcguire@...>:

Yup, definitely interested. It's a lot of stuff and I'm spread a bit
too thin.

-Dave

On 4/10/20 3:53 PM, Bruce wrote:
Put me on the list to notify as you get to them.? I could help if you
are interested in help.

Cheers!


Quoting Dave McGuire <mcguire@...>:

On 4/10/20 3:16 PM, Bruce wrote:
I'd like to correspond off line about how you did the translation.? I'd
like to do the same for the 8340 and some other equipment I have.? As I
said, I have an 9000/300 system and a good hpib analyzer to work with.?
I'd be interested in any insight you have developed in the process of
translating the software.? I'd be willing to share any of the HP softwar
I've collected
? On that note, I have calibration and verification software for many,
many different instruments that I got from a calibration house that shut
down.? It will be awhile before I will be able to image the disks and
tapes, but that is my eventual plan.? They are safe for now.

????????????? -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA






--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 334A Balance Pots

 

The balance pots have to work up to hundreds of kilohertz. I don't know if a wire wound would behave. I think my new control is conductive plastic. It just has to be durable, quiet, and stay put.

Dave Wise
________________________________________
From: [email protected] <[email protected]> on behalf of n4buq via groups.io <n4buq@...>
Sent: Friday, April 10, 2020 12:19 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A Balance Pots

I wondered about doing something similar and have experienced what you're describing as well. Even though they're W-W, I also wondered if a ten-turn pot would work well and may give it a try (outside of the box). Of course you can't get to a balance point as quickly, it may make fine tuning somewhat easier.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Dave Wise" <david_wise@...>
To: [email protected]
Sent: Friday, April 10, 2020 2:14:29 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A Balance Pots

?My 332A's COARSE pot did not respond adequately to cleaning. I replaced it.
I do not like concentric controls in this application - it's too easy for
FINE motion to nudge COARSE slightly. I drilled a hole and installed a
separate pot. I'm very satisfied with the way the controls behave, if not
how they look.
Re: Craigslist HP 8566B Indianapolis

 

On 4/10/20 6:49 AM, wallydoc via groups.io wrote:
Just recently, I was working on my Marconi 2380 Spectrum Analyzer and
realized there was a need for a decent anti gravity device. However my
inquiries to the government about their gravity wave program were not
met with any degree of sincerity. Apparently they have some sort of very
large device that can measure gravity "waves".
That would certainly be handy.

I too have a Marconi 2380+2382. I had one many years ago and loved
it, but had to sell it during a bad situation. I was lucky enough to
find another one about two years ago, and it "sorta works" but is very
flaky. Most of its issues seem digital in nature. I've yet to really
dig into it.

I'm a total HP snob, but those Marconi 2380s are really nice spectrum
analyzers.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Seeking advice on a precision DVM

 

Hi all
this is one of my favorite topics (i must own over 100 different models of digital multimeter) so it is hard for me to resist adding my 2 cents!

I think the immediate requirement of higher accuracy measurements of resistance in the range of 0.1 ohm is a good place to start.

the meters that the other folks have recommended are all pretty good candidates, the practical differences for the intended use really boil down most to things like display type, physical size, and expected reliability and stability.

i would like to add one candidate (which did get a passing mention) the Keithley 2000 and its variants, especially the 2700 ¡°data acquisition unit¡± (which is more or less a model 2000 with additional multichannel data and signal input circuits) the reason this meter is noteworthy is that they are selling, in working condition, in the same range as the gold standard hp 34401a, around $300.

the 2700 has very similar accuracy, slightly better drift specs (and in my experience markedly better drift performance) and a 1 ohm resistance range! The 34401a lowest range is 100 ohms, and the 3457 30 ohms. Of course with accuracies on the order of 40-80 ppm (90 day specs) the useful resolution for a 0.1 ohm measurement is 4 digits. All of these meters can do that.

And actually price/performance might lead you to the hp 3457, they are ridiculously cheap. But they are full rack size units, like the 3456 also. And bench space is important, to me!

so I recommend a Keithley 2000 or 2700 or one of their other ¡°integra series¡± 6-1/2 digit models.?
Re: 4195A question

 

Yup, definitely interested. It's a lot of stuff and I'm spread a bit
too thin.

-Dave

On 4/10/20 3:53 PM, Bruce wrote:
Put me on the list to notify as you get to them.? I could help if you
are interested in help.

Cheers!


Quoting Dave McGuire <mcguire@...>:

On 4/10/20 3:16 PM, Bruce wrote:
I'd like to correspond off line about how you did the translation.? I'd
like to do the same for the 8340 and some other equipment I have.? As I
said, I have an 9000/300 system and a good hpib analyzer to work with.?
I'd be interested in any insight you have developed in the process of
translating the software.? I'd be willing to share any of the HP softwar
I've collected
? On that note, I have calibration and verification software for many,
many different instruments that I got from a calibration house that shut
down.? It will be awhile before I will be able to image the disks and
tapes, but that is my eventual plan.? They are safe for now.

????????????? -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA





--
Dave McGuire, AK4HZ
New Kensington, PA
Re: 4195A question

 

On 4/10/20 3:55 PM, Bruce wrote:
I could also verify the software for anything requiring HP 9000 / 300
computers
I'll be doing that too; I have quite a lot of that hardware. I still
have to get things set up, get RMB loaded, etc.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: 4195A question

 

I could also verify the software for anything requiring HP 9000 / 300
computers


Quoting Dave McGuire <mcguire@...>:

On 4/10/20 3:16 PM, Bruce wrote:
I'd like to correspond off line about how you did the translation.? I'd
like to do the same for the 8340 and some other equipment I have.? As I
said, I have an 9000/300 system and a good hpib analyzer to work with.?
I'd be interested in any insight you have developed in the process of
translating the software.? I'd be willing to share any of the HP softwar
I've collected
On that note, I have calibration and verification software for many,
many different instruments that I got from a calibration house that shut
down. It will be awhile before I will be able to image the disks and
tapes, but that is my eventual plan. They are safe for now.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: 4195A question

 

Put me on the list to notify as you get to them. I could help if you
are interested in help.

Cheers!


Quoting Dave McGuire <mcguire@...>:

On 4/10/20 3:16 PM, Bruce wrote:
I'd like to correspond off line about how you did the translation.? I'd
like to do the same for the 8340 and some other equipment I have.? As I
said, I have an 9000/300 system and a good hpib analyzer to work with.?
I'd be interested in any insight you have developed in the process of
translating the software.? I'd be willing to share any of the HP softwar
I've collected
On that note, I have calibration and verification software for many,
many different instruments that I got from a calibration house that shut
down. It will be awhile before I will be able to image the disks and
tapes, but that is my eventual plan. They are safe for now.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 334A Balance Pots

 

On 4/10/20 3:22 PM, n4buq wrote:
I may try prying them open as well so as to be a bit more careful about how I'm cleaning things in there.
I've had pretty good luck prying open variable resistors, but you have
to be very careful about breaking off the tabs. Only bend them out as
much as is absolutely necessary, and if possible, try to spread the bend
over a longer portion of the length of the tab to avoid creating weak spots.

What I try to do once I get them open is flush out as much of the old
shaft grease (heh, "shaft grease") as possible with a solvent,
relubricate, clean the (usually cermet) element very carefully with a
soft brush and a solvent formulated for the purpose, then coat with Caig
FaderLube.

This process will recover nearly all cermet-element variable resistors
unless the element is physically worn away. A can of FaderLube is not
cheap, but a little goes a long way, and it's a real life saver.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: 5343A troubles

 

Have you done a very thorough inspection of the input connector and checked it for any play (looseness)? If loose then check the cable connection on the inside of the input connector for any hardline cable cracks at the coupling nut. These 534xA counters are susceptible to these cracks when the input is over tightened or the input connector is loose on the front panel - the same is true for the HP 8566 SA¡¯s.
Also be very care about how much power you apply to the inputs on the 534xA counters, the limit is on the front panel. If you exceed this limit the sensing diode will be toast. It is a common failure on these counters. Unless I know the signal power I am measuring I use an attenuator on the input.
Don Bitters
Re: HP 334A Balance Pots

 

On 4/10/20 3:21 PM, n4buq wrote:
I'd considered doing that as well but I've read horror-stories where some "cleaners" have dissolved the carbon track rather unexpectedly.
Poor choice of cleaning chemicals often results in a bad day.
Cleaning chemicals that were formulated specifically for this
application tend to be a lot more expensive than those that were not,
but we live in a "this one was CHEAPER!" society that generally doesn't
understand the concept of the "false economy".

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 334A Balance Pots

 

I may try prying them open as well so as to be a bit more careful about how I'm cleaning things in there.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Richard Knoppow" <dickburk@...>
To: [email protected]
Sent: Friday, April 10, 2020 1:45:25 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A Balance Pots

?? I have had some luck by prying the covers off for cleaning
and then crimping the tabs back. Can't be done where the pots are
stacked. AB were the best of the bunch are a pain to clean.
Ohmite sold these same pots under their own name. Same for fixed
composition resistors, Ohmite and AB are actually all AB. Ohmite
actually says this in some of its early advertising. I have no
idea what the story behind this was.

On 4/10/2020 11:30 AM, ebrucehunter via groups.io wrote:
Barry,

I have one of these instruments, but it is too buried to easily
allow inspection to determine what type of pots were used.

If the values are above 1k, they are probably not wire-wound.
If they happen to be Allen-Bradley (AB) pots, an age old remedy
is to take a 1/16-inch drill bit and drill a hole in the cover
- in the outer crevice - at the bottom of the pot away from the
terminals.? The snout of a can of contact cleaner can then be
inserted in the drilled hole to blast the interior of the pot.
This cleaning will typically last for two or three years and
then you might have to do it again.? The access hole remains
available.? In drilling the hole, metal chips seem to be pulled
outward and are unlikely to enter the pot.? But be careful so
that when the drill bit breaks through, that it does not enter
and damage the pot.

Often these pots can be cleaned by pulling outward on the shaft
-- it will move about 1/16-inch -- while quickly turning the
knob from end to end.

Bruce, KG6OJI
--
Richard Knoppow
dickburk@...
WB6KBL
Re: HP 334A Balance Pots

 

I'd considered doing that as well but I've read horror-stories where some "cleaners" have dissolved the carbon track rather unexpectedly.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "ebrucehunter via groups.io" <Brucekareen@...>
To: [email protected]
Sent: Friday, April 10, 2020 1:30:10 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A Balance Pots

Barry,
I have one of these instruments, but it is too buried to easily allow
inspection to determine what type of pots were used.

If the values are above 1k, they are probably not wire-wound.? If they happen
to be Allen-Bradley (AB) pots, an age old remedy is to take a 1/16-inch
drill bit and drill a hole in the cover - in the outer crevice - at the
bottom of the pot away from the terminals.? The snout of a can of contact
cleaner can then be inserted in the drilled hole to blast the interior of
the pot.? This cleaning will typically last for two or three years and then
you might have to do it again.? The access hole remains available.? In
drilling the hole, metal chips seem to be pulled outward and are unlikely to
enter the pot.? But be careful so that when the drill bit breaks through,
that it does not enter and damage the pot.
Often these pots can be cleaned by pulling outward on the shaft -- it will
move about 1/16-inch -- while quickly turning the knob from end to end.

Bruce, KG6OJI
46821 - 46840 of 151482