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Re: HP 8665A Latest ROMS

 

It shows the latest for the "A" version. And then probably the latest for the "B". What's the problem?
Re: HP200CD oscillator

 

FWIW, metal and carbon film resistors can dissipate a lot of heat. The factory I worked at, who specialized in precision resistors, found that carbon film resistors on ceramic cores (which is nearly all of them) would run at red heat without damage to the resistance element. I don't know if the test was ever run on metal film resistors but they are probably the same. Of course, it boiled off the conformal coating.
?? Wire wound power resistors (to differentiate them from WW precision resistors) are usually rated at a given temperature rise for the dissipation rating.

On 11/9/2021 4:19 PM, Chuck Harris wrote:
As was I, and so I said in my post. HP didn't always follow that
advice. The 608F signal generator has a metal film power resistor
in one of its circuits that, by design, dissipated twice its rated
value. Not a good idea, but it worked... and worked... and worked.

I would spend a bit of time trying to verify that the power dissipated
was by design.

-Chuck Harris


On Tue, 9 Nov 2021 21:56:03 +0000 (UTC) "Bob Albert via groups.io"
<bob91343@...> wrote:
I was always taught to hold power dissipation in a resistor to
one-half its power rating. Bob
On Tuesday, November 9, 2021, 01:52:55 PM PST, Richard Merifield
<coitboy2000@...> wrote:
Thanks Chuck

Its a 10w resistor with about 9w dissipation so I guess it is doing
what it was designed to do. As a hobbyist only having worked on a few
solid state amplifiers, all you read suggests avoiding such heat in a
resistor.

Richard






--
Richard Knoppow
dickburk@...
WB6KBL
Re: HP200CD oscillator

 

As was I, and so I said in my post. HP didn't always follow that
advice. The 608F signal generator has a metal film power resistor
in one of its circuits that, by design, dissipated twice its rated
value. Not a good idea, but it worked... and worked... and worked.

I would spend a bit of time trying to verify that the power dissipated
was by design.

-Chuck Harris


On Tue, 9 Nov 2021 21:56:03 +0000 (UTC) "Bob Albert via groups.io"
<bob91343@...> wrote:
I was always taught to hold power dissipation in a resistor to
one-half its power rating. Bob
On Tuesday, November 9, 2021, 01:52:55 PM PST, Richard Merifield
<coitboy2000@...> wrote:
Thanks Chuck

Its a 10w resistor with about 9w dissipation so I guess it is doing
what it was designed to do. As a hobbyist only having worked on a few
solid state amplifiers, all you read suggests avoiding such heat in a
resistor.?

Richard




Re: HP200CD oscillator

 

Generally speaking, avoiding heat in a wire wound resistor
is right up there with avoiding heat in your home heating
system.

If you were it put in a higher wattage more modern resistor,
you most likely would find that it was smaller, and got hotter.

-Chuck Harris


On Tue, 09 Nov 2021 13:52:51 -0800 "Richard Merifield"
<coitboy2000@...> wrote:
Thanks Chuck

Its a 10w resistor with about 9w dissipation so I guess it is doing
what it was designed to do. As a hobbyist only having worked on a few
solid state amplifiers, all you read suggests avoiding such heat in a
resistor.

Richard
Re: My brother is helping a friend sell off his tektronics, hp, heathkit test and measurement collection

 

Why not put a list of his stuff here? That way he won't get buried in emails.
Re: Looking for Agilent IO Libraries Suit 14.2

 

Hi Frank, and anyone else who might like a copy,

I've uploaded a 2006 copy of? IO Libraries Suite 14.2 to Mediafire...

https://www.mediafire.com/file/5p5c49rao8s8tal/IO_Libraries_Suite_14v2_170606.zip/file

This file includes the program itself plus manuals and other information downloaded at that time.

I've checked the download and it's working fine here but I have noticed recently that Mediafire can add in advertising at times, and sometimes for sites that might be considered somewhat questionable, but such content has nothing to do with me.

Nigel GM8PZR



Looking for Agilent IO Libraries Suit 14.2
From: Frank C. D'Amato - KB2MXV
Date: Tue, 09 Nov 2021 17:55:55 GMT
Can someone help me find?Agilent IO Libraries Suit 14.2 please.

I need it for a windows XP machine.

Thanks

Re: HP200CD oscillator

 

Hi Richard,

You should replace C13 if it is getting hot. You can use three 10 uF 630 volt electrolytics for that. I haven't taken my 200CD down to check the R30/31 situation but it certainly looks like it is normal for them to dissipate quite a bit of power and therefore get hot. I would have thought R30/31 should be wirewound with 10-20 watt ratings.? If the rectifier tube is weak you can replace it with silicon diodes as HP themselves did in the last versions of the 200CD. My copy of the June 1967 manual shows silicon diodes in the power supply but they are drawn backwards!

I'm in Melbourne so hands-on assistance including tube testing (for balance) will depend on whether you can find someone a bit closer.

Regards,

Morris
Re: HP200CD oscillator

Bob Albert
 

I was always taught to hold power dissipation in a resistor to one-half its power rating.

Bob

On Tuesday, November 9, 2021, 01:52:55 PM PST, Richard Merifield <coitboy2000@...> wrote:


Thanks Chuck

Its a 10w resistor with about 9w dissipation so I guess it is doing what it was designed to do. As a hobbyist only having worked on a few solid state amplifiers, all you read suggests avoiding such heat in a resistor.?

Richard

Re: HP200CD oscillator

 

Thanks Chuck

Its a 10w resistor with about 9w dissipation so I guess it is doing what it was designed to do. As a hobbyist only having worked on a few solid state amplifiers, all you read suggests avoiding such heat in a resistor.?

Richard
Re: HP 401 c VTVM

 

I would like to take the time to thank all for helping me with my meter question.

mark javit
Re: Looking for Agilent IO Libraries Suit 14.2

 

On Tue, Nov 9, 2021 at 10:14 AM Frank C. D'Amato - KB2MXV
<kb2mxv@...> wrote:

Thank you Tom
Also, if you really want 14.2, go here:

www.keysight.com/find/iosuite

Click on Previous Versions, and then scroll down to 2006-06-01 Version
14.2.8931.1 and then you can download the 82MB installation file
iolibs_suite_14_2_8931_1_multimedia.exe
Re: Looking for Agilent IO Libraries Suit 14.2

Frank C. D'Amato - KB2MXV
 

Thank you Tom
Re: Looking for Agilent IO Libraries Suit 14.2

 

¿ªÔÆÌåÓý

Version 15.0 will run on XP.

See

Tom Bryan
N3AJA

On 11/9/2021 12:53 PM, Frank C. D'Amato - KB2MXV wrote:

Can someone help me find?Agilent IO Libraries Suit 14.2 please.

I need it for a windows XP machine.
Looking for Agilent IO Libraries Suit 14.2

Frank C. D'Amato - KB2MXV
 

Can someone help me find?Agilent IO Libraries Suit 14.2 please.

I need it for a windows XP machine.

Thanks
Re: Placing Shelf on Casters for HP Equipment

 

Hi Mat
Ideal for supporting light instruments such as 2 off 437 power meters but I
wooden risk 2 off 3314 Function generators
But then 2 side supports with a bit of metal spanning them is probably less
expensive
Regards Paul

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Matt Huszagh
Sent: 09 November 2021 17:15
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Placing Shelf on Casters for HP
Equipment

Another question: is there a rule of thumb for when a module requires
support rails in addition to the flange or ear mounts? If it's relevant,
this would be for a NavePoint 42U rack:


-rack-with-casters/

Thanks
Matt
Re: Placing Shelf on Casters for HP Equipment

 

On 11/8/21 5:58 PM, Matt Huszagh wrote:
Did you make your own supports from angle irons, Dave? It sounds like
getting 1.5 in sq angle irons 1/8" thick and then drilling custom holes
for mounting to the rack could work well here. I expect the trick is
drilling the holes at just the vertical height so that the modules sit
on the angle iron but the flanges still mount to the front panel.
No, I'm too much of a perfectionist (read: snob) (and have too little
free time) to do that. I get proper rack rails, usually Navepoint these
days.
If it's not too much trouble, would you mind sending me a link to the
Navepoint rack rails you get? I think I'm not finding quite the right
thing.
These are the ones I use for most things:



I first spotted them (and Navepoint as a company) on eBay, so I just ended up buying them there.

As I mentioned earlier, they are a bit software than I'd like, but they're otherwise well-made and have been very handy.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP200CD oscillator

 

On 11/9/21 8:42 AM, Chuck Harris wrote:
You need to bear in mind that power resistors of the
ceramic wirewound, or metal film, variety are heaters.

They are designed to get very hot at their *rated* power.
200C is typical. Most wirewound resistors can be made
to glow red hot without anything more than a little
discoloration. The wire used is typically nichrome
heating element wire.

For safety issues, engineers usually don't want anything
that hot inside of their chassis, but in cases where
they need bulk power dissipation, sometimes they do.

Assuming that these resistors are DC load, resistors,
measure the voltage across the resistor using a dc meter,
and plug that value into Power = V*V/R, and if Power
is less than the resistor's rated value, you are probably
ok. Engineers typically spec their resistors to run at
about 1/2 the manufacturer's rated power.

There is no point in paying for a large power resistor if
you don't need a large power resistor.

-Chuck Harris
Finally some common sense! (I don't know what kind of resistor
is in the unit, of course.)? Doug--WA2SAY--retired RF engineer


On Tue, 09 Nov 2021 04:04:39 -0800 "Richard Merifield"
<coitboy2000@...> wrote:
Thanks Morris, yes I will transfer it over to 240V.

...Before I did so I noticed R30 was
scolding hot like my other unit. I wonder whether they ever
considered high wattage resistors for R30 ?
Re: Placing Shelf on Casters for HP Equipment

 

On 11/9/21 12:15 PM, Matt Huszagh wrote:
Another question: is there a rule of thumb for when a module requires
support rails in addition to the flange or ear mounts?
There's no real rule of thumb. Some people insist that cantilevered mount via ears alone is never safe, but a lifetime of seeing equipment mounted that way, and having a lab full of some and a computer museum full of more, much of it factory, I say that's BS. "Use judgment".

It also pays to check the documentation, sometimes mounting requirements are covered.

If it's relevant,
this would be for a NavePoint 42U rack:
That looks nice. But you're in the USA in 2021: Companies are going tits-up left and right, and datacenters are being decommissioned and consolidated everywhere. With a little patience and smart snooping you should have no trouble at all finding a good solid rack for free, or very cheap, unless you're really out in the sticks. (which is a separate problem, with a separate solution)

In particular, keep an eye on local GovDeals listings, in particular university surplus if you're near a decent-sized university.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP ET8866 True RMS meter - any info on this?

 

This has been converted to read the output voltage of a HeNe laser power supply e.g. Voltex Inc S-28-LI unit.
Re: Placing Shelf on Casters for HP Equipment

 

¿ªÔÆÌåÓý

Nice!? The advantages of living where property values are sane.? Unlike Southern California where I live, at least anywhere near the coast.? Plenty of cheap land out in the desert....? ? ?Jim



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: "Michael A. Terrell" <terrell.michael.a@...>
Date: 11/8/21 7:24 PM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Placing Shelf on Casters for HP Equipment

That large detached garage was why I bought this house. I installed a 100A breaker box in it, and installed switches by each door to divide the 10' by 20' bays in half, so you can light any 10' by 10' square that you want. Double, duplex outlets every ten feet along the walls, and the rear 10; by 40' is for office and storage., if I don't get around to building a 40 foot long bench against the rear wall. I also installed dual duplex outlets under each pair of light switches on the door posts. Everything in EMT, except for cords where the overhead lights plug in.

On Mon, Nov 8, 2021 at 6:18 PM Jim Ford <james.ford@...> wrote:
I'm envious, Michael!? I'm lucky if I have 50 square feet.? More if I move the car out of the garage, though.? Few hundred sq ft max.? ?Jim



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: "Michael A. Terrell" <terrell.michael.a@...>
Date: 11/8/21 12:34 PM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Placing Shelf on Casters for HP Equipment

Some of the racks are free standing, and others are beside the bench. My workshop is 1200 square feet, in a stand alone garage.

On Mon, Nov 8, 2021 at 3:17 PM Bruce <bruce@...> wrote:
Interesting idea - but if the rack is behind a bench, the drawers are?
a bit difficult to get to.? Much depends on how yu position the?
equipment "racking" relative to the work space.

Cheers!

Bruce

Quoting "Michael A. Terrell" <terrell.michael.a@...>:

> I collected turntable drawers from old school intercom systems. With a
> little work, I turned them into drawers to go in the lower part of racks to
> store cables and small equipment.
>
> On Mon, Nov 8, 2021 at 3:05 PM Bruce <bruce@...> wrote:
>
>> One disadvantage to racks is that it is difficult to utilize the space
>> below bench level.? If you look at HP packaged configurations (HP
>> 8510C for example) does not have front panel control or is controlled
>> ia GPIB.
>>
>> True, things like power supplies can be used on the lower level, but
>> generally bench top access is required for test equipment - GPIB
>> control is an option but commercial software is expensive and
>> configuration management can be complicated.
>>
>> Cheers
>>
>> Bruce
>>
>>
>>
>> Quoting Dave McGuire <mcguire@...>:
>>
>> > On 11/7/21 9:53 PM, Jim Ford wrote:
>> >> HP gear does have handles and rack ears that work together, at
>> >> least the 8566 spec an and 8530 sweep oscillator.? Handy to keep
>> >> the handles on there, should rearrangement be necessary.
>> >
>> >? ?The HP System I (example: 8640B) chassis system has handles built
>> > into the side frame castings, and ears that work with them.? The
>> > System II (example: 8566, 8350) chassis systems have ears that work
>> > standalone, and ears that work with handles.
>> >
>> >? ? ? ? ? ? ?-Dave
>> >
>> > --
>> > Dave McGuire, AK4HZ
>> > New Kensington, PA
>> >
>> >
>> >
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>








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