The constant voltage transformer provides not only stability but also isolation.? I found that out the hard way when I cleverly decided to eliminate it.? The capacitor had failed so I finally did the distasteful job of digging out the old part from all the tar and installing modern capacitors.? It works great.
Too bad about the RX meter.? Those are great instruments too and I wish I had one.
My house is only so big, and since my daughter moved in a couple of years ago I need to allocate space for her as well.? I need to get rid of the old gear I no longer use.? I thought I had sold a signal generator and a tube tester but both deals fell through.? The shipping cost killed it.
I recently built a hipot tester.? I don't know if I will use it but I love doing stuff like that.? I still have a long list of projects in process and ought to get to some of them.
Meanwhile I indulge in my other pursuits, the gym and jazz and ham radio to name a few.
Bob
On Thursday, August 29, 2019, 11:28:20 PM PDT, Richard Knoppow <dickburk@...> wrote:
? ? I am also a fan of GR and Boonton Radio. I also have had
difficulty with the constant voltage transformer in both the 190A
UHF Q-meter and the 260 Q-meter. They get quite hot in normal
operation but when they go bad all the potting material boils
out. The instruments would probably work with plain transformers
but the constant voltage ones provide a lot of stability. I also
like the Boonton RX-Meter. Mine came a cropper when it fell off a
bench. Damage was done that can't be repaired. Eventually I will
find another one.
On 8/29/2019 9:12 PM, Bob Albert via Groups.Io wrote: > I have two Boonton Q meters, the 260(?) for HF and its VHF > brother.? They work great and are a joy to use.? Kudos to those > brilliant engineers who designed all this marvelous gear.? I had > to repair the VHF one but it was the power supply constant > voltage unit.? I can make good measurements without benefit of > the standard coils but they would make life a bit easier for some > tests. > > While I repair equipment for others, my real pleasure is in > operating these high end items.? I recall, as an engineering > student, lusting for a GR 650 impedance bridge.? Now I have > better ones and really enjoy using them.? GR made as good > equipment as one could buy; I hated to see the demise of the > company.? They did more than just make electronics; they > pioneered employee benefits at a time when so many workers were > struggling with poor conditions and long hours and low pay. > > But I show my age... > > Bob > > On Thursday, August 29, 2019, 07:30:59 PM PDT, Dave McGuire > < mcguire@...> wrote: > > > On 8/29/19 10:27 PM, Bob Albert via Groups.Io wrote: >? > My casual assessment is that the battery ran down because I > hadn't used >? > the unit for a while.? So I am making a point of using it and > will see >? > if the anomaly repeats itself. >? > >? > Even if it does, this unit really impresses me and using it is > a lot of >? > fun.? It's the only digital 'scope I've ever used.? Seeing the > aliasing >? > is fun too.? The FFT lets me measure distortion.? I got it for > what I >? > consider a bargain price. > >? ? They really are nice oscilloscopes. > >? > My lab is now almost complete, if there is such a thing.? I'd > like to >? > get the standard coils for the Q meter and an RF > millivoltmeter and a >? > vector impedance meter and some resistor decade boxes.? I > don't have >? > room for it all.? I need to sell off the older stuff like a > tube tester, >? > some sig gens, and voltmeters and oscillators and power > supplies.? Also >? > the EICO 950B bridge. > >? ? Nice, which Q meter do you have? > >? > All of it will go to the dumpster when I die in a few years; I > just hit >? > 87 and don't imagine I have that much time left. > >? ? Surely you can point that wonderful stuff in a better > direction than a > dumpster.. > >? ? ? ? ? ? ? -Dave > > -- > Dave McGuire, AK4HZ > New Kensington, PA > > > -- Richard Knoppow dickburk@...WB6KBL
|
Re: How to dispose old electronics test equipment LEGALLY
Not insignificant to the future owners of the property.
toggle quoted message
Show quoted text
On 30/08/19 3:09 pm, Peter Gottlieb wrote: I think there is no real point in keeping this going.? We all have bigger issues to deal with.? I have seen major pollution; this is insignificant.
On 8/29/2019 4:33 PM, info@... wrote:
Pete you said you removed the toxic materials before you buried, no prove of that but ok lets belive you... what did you do with the toxic hazard materials you removed? do you have a receipt where you took that for propper disposal? on the picture I can see equipment closed with its cases even some small card boxes closed with parts I assume. You said Companies do that, these companies need permits, special facilities and special training to handle all of that is not like you said. "?I have watched them do it" and now you are a professional disposal service!!! What a joke.
|
I am also a fan of GR and Boonton Radio. I also have had difficulty with the constant voltage transformer in both the 190A UHF Q-meter and the 260 Q-meter. They get quite hot in normal operation but when they go bad all the potting material boils out. The instruments would probably work with plain transformers but the constant voltage ones provide a lot of stability. I also like the Boonton RX-Meter. Mine came a cropper when it fell off a bench. Damage was done that can't be repaired. Eventually I will find another one.
toggle quoted message
Show quoted text
On 8/29/2019 9:12 PM, Bob Albert via Groups.Io wrote: I have two Boonton Q meters, the 260(?) for HF and its VHF brother.? They work great and are a joy to use.? Kudos to those brilliant engineers who designed all this marvelous gear.? I had to repair the VHF one but it was the power supply constant voltage unit.? I can make good measurements without benefit of the standard coils but they would make life a bit easier for some tests.
While I repair equipment for others, my real pleasure is in operating these high end items.? I recall, as an engineering student, lusting for a GR 650 impedance bridge.? Now I have better ones and really enjoy using them.? GR made as good equipment as one could buy; I hated to see the demise of the company.? They did more than just make electronics; they pioneered employee benefits at a time when so many workers were struggling with poor conditions and long hours and low pay.
But I show my age...
Bob
On Thursday, August 29, 2019, 07:30:59 PM PDT, Dave McGuire <mcguire@...> wrote:
On 8/29/19 10:27 PM, Bob Albert via Groups.Io wrote:
> My casual assessment is that the battery ran down because I
hadn't used
> the unit for a while.? So I am making a point of using it and
will see
> if the anomaly repeats itself.
>
> Even if it does, this unit really impresses me and using it is
a lot of
> fun.? It's the only digital 'scope I've ever used.? Seeing the
aliasing
> is fun too.? The FFT lets me measure distortion.? I got it for
what I
> consider a bargain price.
? They really are nice oscilloscopes.
> My lab is now almost complete, if there is such a thing.? I'd
like to
> get the standard coils for the Q meter and an RF
millivoltmeter and a
> vector impedance meter and some resistor decade boxes.? I
don't have
> room for it all.? I need to sell off the older stuff like a
tube tester,
> some sig gens, and voltmeters and oscillators and power
supplies.? Also
> the EICO 950B bridge.
? Nice, which Q meter do you have?
> All of it will go to the dumpster when I die in a few years; I
just hit
> 87 and don't imagine I have that much time left.
? Surely you can point that wonderful stuff in a better direction than a
dumpster..
? ? ? ? ? ? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Richard Knoppow
dickburk@...
WB6KBL
|
Re: How to dispose old electronics test equipment LEGALLY
Good to know, thanks. Location of this Goodwill, please?
On Thu, Aug 29, 2019 at 10:09 PM Dick < w1ksz@...> wrote:
I found an ARR-41 at my local Goodwill last year. They will
take Test Equipment.
If it's junk, take it to your local salvage yard.
73, Dick, W1KSZ
On 8/29/19 11:24 PM, Jeremy Nichols wrote:
> Many thrift stores now won¡¯t accept electronics at all. If the product
> turns out to be broken, worthless, or simply doesn¡¯t sell, they¡¯re stuck
> with the disposal problem.
? I've noticed that lately, and I've made it a point to speak up
whenever there's a manager around.? There are still some thrift stores
around here where electronics of various sorts show up (no test
equipment though) but the rest of them have turned into seas of gaudy
shoes for old women, coffee mugs, and truly astonishing numbers of the
Twilight books.
????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: How to dispose old electronics test equipment LEGALLY
You misunderstand, I'm on the buying end, not the getting-rid-of end! ;) -Dave On August 30, 2019 1:09:09 AM "Dick" <w1ksz@...> wrote: I found an ARR-41 at my local Goodwill last year. They will
take Test Equipment.
If it's junk, take it to your local salvage yard.
73, Dick, W1KSZ
Sent from Outlook<>
________________________________
From: [email protected] <[email protected]> on behalf of Dave McGuire <mcguire@...>
Sent: Thursday, August 29, 2019 8:35 PM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] How to dispose old electronics test equipment LEGALLY
On 8/29/19 11:24 PM, Jeremy Nichols wrote:
Many thrift stores now won¡¯t accept electronics at all. If the product
turns out to be broken, worthless, or simply doesn¡¯t sell, they¡¯re stuck
with the disposal problem. I've noticed that lately, and I've made it a point to speak up
whenever there's a manager around. There are still some thrift stores
around here where electronics of various sorts show up (no test
equipment though) but the rest of them have turned into seas of gaudy
shoes for old women, coffee mugs, and truly astonishing numbers of the
Twilight books.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
-- Dave McGuire, AK4HZ New Kensington, PA
|
Re: How to dispose old electronics test equipment LEGALLY
I found an ARR-41 at my local Goodwill last year. They will
take Test Equipment.
If it's junk, take it to your local salvage yard.
73, Dick, W1KSZ
toggle quoted message
Show quoted text
On 8/29/19 11:24 PM, Jeremy Nichols wrote:
> Many thrift stores now won¡¯t accept electronics at all. If the product
> turns out to be broken, worthless, or simply doesn¡¯t sell, they¡¯re stuck
> with the disposal problem.
? I've noticed that lately, and I've made it a point to speak up
whenever there's a manager around.? There are still some thrift stores
around here where electronics of various sorts show up (no test
equipment though) but the rest of them have turned into seas of gaudy
shoes for old women, coffee mugs, and truly astonishing numbers of the
Twilight books.
????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
I have two Boonton Q meters, the 260(?) for HF and its VHF brother.? They work great and are a joy to use.? Kudos to those brilliant engineers who designed all this marvelous gear.? I had to repair the VHF one but it was the power supply constant voltage unit.? I can make good measurements without benefit of the standard coils but they would make life a bit easier for some tests.
While I repair equipment for others, my real pleasure is in operating these high end items.? I recall, as an engineering student, lusting for a GR 650 impedance bridge.? Now I have better ones and really enjoy using them.? GR made as good equipment as one could buy; I hated to see the demise of the company.? They did more than just make electronics; they pioneered employee benefits at a time when so many workers were struggling with poor conditions and long hours and low pay.
But I show my age...
Bob
On Thursday, August 29, 2019, 07:30:59 PM PDT, Dave McGuire <mcguire@...> wrote:
On 8/29/19 10:27 PM, Bob Albert via Groups.Io wrote:
> My casual assessment is that the battery ran down because I hadn't used
> the unit for a while.? So I am making a point of using it and will see
> if the anomaly repeats itself.
>
> Even if it does, this unit really impresses me and using it is a lot of
> fun.? It's the only digital 'scope I've ever used.? Seeing the aliasing
> is fun too.? The FFT lets me measure distortion.? I got it for what I
> consider a bargain price.
? They really are nice oscilloscopes.
> My lab is now almost complete, if there is such a thing.? I'd like to
> get the standard coils for the Q meter and an RF millivoltmeter and a
> vector impedance meter and some resistor decade boxes.? I don't have
> room for it all.? I need to sell off the older stuff like a tube tester,
> some sig gens, and voltmeters and oscillators and power supplies.? Also
> the EICO 950B bridge.
? Nice, which Q meter do you have?
> All of it will go to the dumpster when I die in a few years; I just hit
> 87 and don't imagine I have that much time left.
? Surely you can point that wonderful stuff in a better direction than a
dumpster..
? ? ? ? ? ? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: How to dispose old electronics test equipment LEGALLY
On 8/29/19 11:24 PM, Jeremy Nichols wrote: Many thrift stores now won¡¯t accept electronics at all. If the product
turns out to be broken, worthless, or simply doesn¡¯t sell, they¡¯re stuck
with the disposal problem. I've noticed that lately, and I've made it a point to speak up whenever there's a manager around. There are still some thrift stores around here where electronics of various sorts show up (no test equipment though) but the rest of them have turned into seas of gaudy shoes for old women, coffee mugs, and truly astonishing numbers of the Twilight books. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Re: How to dispose old electronics test equipment LEGALLY
Many thrift stores now won¡¯t accept electronics at all. If the product turns out to be broken, worthless, or simply doesn¡¯t sell, they¡¯re stuck with the disposal problem.
On Thu, Aug 29, 2019 at 7:25 PM Dave Seiter < d.seiter@...> wrote:
The problem with goodwill is that they won't keep accessories, manuals, and equipment together.? They are also not used to seeing test equipment, so they (most of them anyway) won't know the difference between a worthless PC and a signal generator.??
I've heard Salvation Army does a better job, as does Savers, but it may depend on the individual stores (that goes for Goodwill as well) (ex. Savers accepts tools, whereas Goodwill does not).
-Dave
On Thursday, August 29, 2019, 06:12:56 PM PDT, Dick < w1ksz@...> wrote:
You can also donate to Goodwill.
73, Dick, W1KSZ
Hello--
Having grown up in the 1950s as a pre-teen electronics buff, I looked
forward to
rubbish-collection day when I could scrounge a discarded radio or two on
my way home from school.
I honed my repair skills on some radios and salvaged parts from the
rest. Some components yielded to
internal? investigation (think: vacuum tube and hammer) while others
went into the
copper, aluminum and ferrous-metal scrap boxes. Periodically, my dad
would haul the boxes
to the junk dealer and get a few dollars to help out the family budget.
So, when I decided to thin my test-equipment herd I began by contacting
local ham clubs and
asking if they'd like a donation to sell at the next ham flea market.
Much to my chagrin, the clubs weren't
interested in free test gear. I posted a notice to a local community
e-mail forum and received one
response from a gentleman who home-schools his kids, one of whom was
interested in
electronics. I added some books on basic electronics to the collection.
When the gent arrived in a rusting pickup truck, I inferred that the
family wasn't exactly wealthy.
I learned that they made some money from metal recycling and some from
eBay sales.
Perhaps the equipment all ended up as scrap, or perhaps the kid with an
interest is on his
way to a lifelong career in electronics. It worked? for me.
So, please consider making an effort to give away unwanted equipment on
the chance that
it could potentially do someone more good than if it were deemed
unsaleable and
buried under dirt in a landfill. For an historical context, see...
73--
Brad? AA1IP
|
Re: How to dispose old electronics test equipment LEGALLY
I think there is no real point in keeping this going.? We all have bigger issues to deal with.? I have seen major pollution; this is insignificant.
toggle quoted message
Show quoted text
On 8/29/2019 4:33 PM, info@... wrote: Pete you said you removed the toxic materials before you buried, no prove of that but ok lets belive you... what did you do with the toxic hazard materials you removed? do you have a receipt where you took that for propper disposal? on the picture I can see equipment closed with its cases even some small card boxes closed with parts I assume. You said Companies do that, these companies need permits, special facilities and special training to handle all of that is not like you said. "?I have watched them do it" and now you are a professional disposal service!!! What a joke.
|
Re: How to dispose old electronics test equipment LEGALLY
Electronics recyclers do essentially that.
It has to go somewhere as no recycling operation can just stockpile stuff.
toggle quoted message
Show quoted text
On 8/29/2019 4:00 PM, Pete Manfre wrote: All hazard materials have been removed¡? local land fills do exactly the same.? ?I have watched them do it.
Pete
On Thu, Aug 29, 2019, 3:46 PM <info@... <mailto:info@...>> wrote:
I know this guy in the USA in North Carolina that all the time bury in the
ground electronics parts and old electronics test equipment. This
individual even sent me pictures of this activity so I have prove of this.
I was wondering how can you dispose of this legally if anyone knows a
disposal way or what companies do that, I actually have some monitors and
some old OTDR I need to dispose, and I know I cant throw in the trash. I
know this equipment has toxic materials like lead,mercury, cadmiun,
beryllium, lithium, so it is obviuos that is an illegal activity to bury
in the group like that.
thanks.
|
Re: How to dispose old electronics test equipment LEGALLY
I gave a HUGE pile to the electronics club at a local university. Some of the test gear they used, some stuff they scavenged parts from, other stuff is still stored for future use.
Peter
toggle quoted message
Show quoted text
On 8/29/2019 3:57 PM, info@... wrote: Then legally you need to take it yourself to a disposal unit you cant be a gross polluter like that. I know people throw batteries all the time in the trash and that is illegal. But at least the dont brag about it like this guy does.
I do transformer oil testing and the old mineral oil from the samples I need to take it to a recycling place and I get a receipt in case eviromental agency comes by I need to tell them where do I recycle the wasted products.
|
On 8/29/19 10:27 PM, Bob Albert via Groups.Io wrote: My casual assessment is that the battery ran down because I hadn't used
the unit for a while.? So I am making a point of using it and will see
if the anomaly repeats itself.
Even if it does, this unit really impresses me and using it is a lot of
fun.? It's the only digital 'scope I've ever used.? Seeing the aliasing
is fun too.? The FFT lets me measure distortion.? I got it for what I
consider a bargain price. They really are nice oscilloscopes. My lab is now almost complete, if there is such a thing.? I'd like to
get the standard coils for the Q meter and an RF millivoltmeter and a
vector impedance meter and some resistor decade boxes.? I don't have
room for it all.? I need to sell off the older stuff like a tube tester,
some sig gens, and voltmeters and oscillators and power supplies.? Also
the EICO 950B bridge. Nice, which Q meter do you have? All of it will go to the dumpster when I die in a few years; I just hit
87 and don't imagine I have that much time left. Surely you can point that wonderful stuff in a better direction than a dumpster.. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
My casual assessment is that the battery ran down because I hadn't used the unit for a while.? So I am making a point of using it and will see if the anomaly repeats itself.
Even if it does, this unit really impresses me and using it is a lot of fun.? It's the only digital 'scope I've ever used.? Seeing the aliasing is fun too.? The FFT lets me measure distortion.? I got it for what I consider a bargain price.
Still, I'd like to fool around with other digital units to see how they compare.
My lab is now almost complete, if there is such a thing.? I'd like to get the standard coils for the Q meter and an RF millivoltmeter and a vector impedance meter and some resistor decade boxes.? I don't have room for it all.? I need to sell off the older stuff like a tube tester, some sig gens, and voltmeters and oscillators and power supplies.? Also the EICO 950B bridge.
All of it will go to the dumpster when I die in a few years; I just hit 87 and don't imagine I have that much time left.
Bob
On Thursday, August 29, 2019, 06:23:11 PM PDT, Harvey White <madyn@...> wrote:
On 8/29/2019 12:48 PM, Chuck Harris wrote:
> Hi Bob,
>
> There is no controversy, just some back and forth.
>
> I am never sure what sets Tam off.? I am generally
> sure his utterances rarely meet decency standards for
> polite company... Whatever that means.
>
> If the cell is rechargeable, then they must think the
> circuit being backed up has too heavy of a current draw
> for a normal primary cell to handle.
Weren't NiCd cells easier to come by (at that time) than lithium
batteries?? I know that the TM5000 stuff (depending on age) has leakable
rechargeable nicad batteries, which more or less force you to
recalibrate after 2 or 3 months, or whenever the cells self discharge.?
(Specifically the DM5010, about which I know more than I wanted to).?
The AWG5010 (think that's right) has a lithium cell in it, but it's a
later device.
The 7A42 also has a leakable nicad battery in it.
It may have been a tradeoff between cost, availablility, cell capacity,
or whatever.
>
> And, rechargeable lithium cells don't hold their charge
> for nearly as long as do the primary cell kind.? So, it
> may be needed capacity due to the cell's expected self
> discharge rate.
Aren't the rechargeable lithium batteries after the date of at least
some of the equipment?? Don't they need some very special chips to make
them happy, as opposed to the relatively simple resistor trickle charge
of nicd?
Harvey
> -Chuck Harris
>
>
>
> Bob Albert via Groups.Io wrote:
>>? I didn't mean to start a controversy.? The energy in a cell is measured in terms of its Ampere-hour rating in conjunction with its voltage.
>> Why HP chose such a large battery is beyond me.? Nobody has come forth with the information regarding the charging of this cell in the 54542A.? (My apologies for perpetuating the incorrect term 'battery' for a unit with a single cell.)
>> If it is used as a keep-alive memory voltage, it needs to supply no current and thus doesn't need recharging unless its self discharge is significant.? And more than 2 Ampere-hours is major overkill.? A little CR2032 ought to be sufficient.
>> I wish a schematic diagram were available.? I will learn more when I get around to opening the oscilloscope.? But since it's working well, I hesitate to muck around with it, especially in view of the many other projects I have in the works.
>> Finding an exact replacement is not easy.? I have found some at somewhat lesser capacity but they aren't cheap either, and don't have solder tabs.? I know soldering to these cells isn't recommended but I have done it successfully.? I do have some stock of CR2032 cells and a couple of holders for them so that could be a way to go.? These are not rechargeable.
>> If someone would please step in and clear the air here I would much appreciate it.
>> Bob
>
>
>
>
|
Re: How to dispose old electronics test equipment LEGALLY
The problem with goodwill is that they won't keep accessories, manuals, and equipment together.? They are also not used to seeing test equipment, so they (most of them anyway) won't know the difference between a worthless PC and a signal generator.??
I've heard Salvation Army does a better job, as does Savers, but it may depend on the individual stores (that goes for Goodwill as well) (ex. Savers accepts tools, whereas Goodwill does not).
-Dave
On Thursday, August 29, 2019, 06:12:56 PM PDT, Dick <w1ksz@...> wrote:
You can also donate to Goodwill.
73, Dick, W1KSZ
Hello--
Having grown up in the 1950s as a pre-teen electronics buff, I looked
forward to
rubbish-collection day when I could scrounge a discarded radio or two on
my way home from school.
I honed my repair skills on some radios and salvaged parts from the
rest. Some components yielded to
internal? investigation (think: vacuum tube and hammer) while others
went into the
copper, aluminum and ferrous-metal scrap boxes. Periodically, my dad
would haul the boxes
to the junk dealer and get a few dollars to help out the family budget.
So, when I decided to thin my test-equipment herd I began by contacting
local ham clubs and
asking if they'd like a donation to sell at the next ham flea market.
Much to my chagrin, the clubs weren't
interested in free test gear. I posted a notice to a local community
e-mail forum and received one
response from a gentleman who home-schools his kids, one of whom was
interested in
electronics. I added some books on basic electronics to the collection.
When the gent arrived in a rusting pickup truck, I inferred that the
family wasn't exactly wealthy.
I learned that they made some money from metal recycling and some from
eBay sales.
Perhaps the equipment all ended up as scrap, or perhaps the kid with an
interest is on his
way to a lifelong career in electronics. It worked? for me.
So, please consider making an effort to give away unwanted equipment on
the chance that
it could potentially do someone more good than if it were deemed
unsaleable and
buried under dirt in a landfill. For an historical context, see...
73--
Brad? AA1IP
|
On 8/29/2019 12:48 PM, Chuck Harris wrote: Hi Bob,
There is no controversy, just some back and forth.
I am never sure what sets Tam off. I am generally
sure his utterances rarely meet decency standards for
polite company... Whatever that means.
If the cell is rechargeable, then they must think the
circuit being backed up has too heavy of a current draw
for a normal primary cell to handle. Weren't NiCd cells easier to come by (at that time) than lithium batteries?? I know that the TM5000 stuff (depending on age) has leakable rechargeable nicad batteries, which more or less force you to recalibrate after 2 or 3 months, or whenever the cells self discharge.? (Specifically the DM5010, about which I know more than I wanted to).? The AWG5010 (think that's right) has a lithium cell in it, but it's a later device. The 7A42 also has a leakable nicad battery in it. It may have been a tradeoff between cost, availablility, cell capacity, or whatever.
And, rechargeable lithium cells don't hold their charge
for nearly as long as do the primary cell kind. So, it
may be needed capacity due to the cell's expected self
discharge rate.
Aren't the rechargeable lithium batteries after the date of at least some of the equipment?? Don't they need some very special chips to make them happy, as opposed to the relatively simple resistor trickle charge of nicd? Harvey -Chuck Harris
Bob Albert via Groups.Io wrote:
I didn't mean to start a controversy. The energy in a cell is measured in terms of its Ampere-hour rating in conjunction with its voltage.
Why HP chose such a large battery is beyond me. Nobody has come forth with the information regarding the charging of this cell in the 54542A. (My apologies for perpetuating the incorrect term 'battery' for a unit with a single cell.)
If it is used as a keep-alive memory voltage, it needs to supply no current and thus doesn't need recharging unless its self discharge is significant. And more than 2 Ampere-hours is major overkill. A little CR2032 ought to be sufficient.
I wish a schematic diagram were available. I will learn more when I get around to opening the oscilloscope. But since it's working well, I hesitate to muck around with it, especially in view of the many other projects I have in the works.
Finding an exact replacement is not easy. I have found some at somewhat lesser capacity but they aren't cheap either, and don't have solder tabs. I know soldering to these cells isn't recommended but I have done it successfully. I do have some stock of CR2032 cells and a couple of holders for them so that could be a way to go. These are not rechargeable.
If someone would please step in and clear the air here I would much appreciate it.
Bob
|
Re: How to dispose old electronics test equipment LEGALLY
You can also donate to Goodwill.
73, Dick, W1KSZ
toggle quoted message
Show quoted text
Hello--
Having grown up in the 1950s as a pre-teen electronics buff, I looked
forward to
rubbish-collection day when I could scrounge a discarded radio or two on
my way home from school.
I honed my repair skills on some radios and salvaged parts from the
rest. Some components yielded to
internal? investigation (think: vacuum tube and hammer) while others
went into the
copper, aluminum and ferrous-metal scrap boxes. Periodically, my dad
would haul the boxes
to the junk dealer and get a few dollars to help out the family budget.
So, when I decided to thin my test-equipment herd I began by contacting
local ham clubs and
asking if they'd like a donation to sell at the next ham flea market.
Much to my chagrin, the clubs weren't
interested in free test gear. I posted a notice to a local community
e-mail forum and received one
response from a gentleman who home-schools his kids, one of whom was
interested in
electronics. I added some books on basic electronics to the collection.
When the gent arrived in a rusting pickup truck, I inferred that the
family wasn't exactly wealthy.
I learned that they made some money from metal recycling and some from
eBay sales.
Perhaps the equipment all ended up as scrap, or perhaps the kid with an
interest is on his
way to a lifelong career in electronics. It worked? for me.
So, please consider making an effort to give away unwanted equipment on
the chance that
it could potentially do someone more good than if it were deemed
unsaleable and
buried under dirt in a landfill. For an historical context, see...
73--
Brad? AA1IP
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I was once told a rechargeable loses 50 % of its capacity / charge in a year
but a normal primary cell loses less than 10% capacity / charge in a year
A new rechargeable cell takes 14 hours at 10% capacity to charge
When in equipment for memory the charge current is usually below 10 %
Paul
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-----Original Message----- From: [email protected][mailto: [email protected]] On Behalf Of Tam Hanna Sent: 29 August 2019 21:57 To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] HP 54542A Hello, please see below. I am never sure what sets Tam off. I am generally Easy. Whatever sets me off. sure his utterances rarely meet decency standards for
polite company... Whatever that means. I cherish that position and ability. Being semi retired and having my under ground lab means that I am my own company. And I think I am quite polite ;).
If the cell is rechargeable, then they must think the
circuit being backed up has too heavy of a current draw
for a normal primary cell to handle.
With all military respect, but on my desk, someone loudly screams LOGIC VARIABLE (bool'ean) SHEET. I am the proud owner of a HP 4195A, whose CPU board (as that of the 4194A) has the nasty habit of not booting when its internal NiCad cell goes dry. I did not perform current measurements on mine as of yet, but from what I picked up from fellow owners, the units need 24H of being on all the time to fully recharge. So whatever current goes in and out there, must be tiny. And, rechargeable lithium cells don't hold their charge
for nearly as long as do the primary cell kind. So, it
may be needed capacity due to the cell's expected self
discharge rate. This is 100% true, excluding special chemistries of rechargeable battery, which however, can be beaten by specific non rechargeable chemistries. I owe a friend at SAFT a favor, I can ask her. Has been years since I worked with batteries.
-Chuck Harris
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Re: How to dispose old electronics test equipment LEGALLY
Hello--
Having grown up in the 1950s as a pre-teen electronics buff, I looked forward to
rubbish-collection day when I could scrounge a discarded radio or two on my way home from school.
I honed my repair skills on some radios and salvaged parts from the rest. Some components yielded to
internal? investigation (think: vacuum tube and hammer) while others went into the
copper, aluminum and ferrous-metal scrap boxes. Periodically, my dad would haul the boxes
to the junk dealer and get a few dollars to help out the family budget.
So, when I decided to thin my test-equipment herd I began by contacting local ham clubs and
asking if they'd like a donation to sell at the next ham flea market. Much to my chagrin, the clubs weren't
interested in free test gear. I posted a notice to a local community e-mail forum and received one
response from a gentleman who home-schools his kids, one of whom was interested in
electronics. I added some books on basic electronics to the collection.
When the gent arrived in a rusting pickup truck, I inferred that the family wasn't exactly wealthy.
I learned that they made some money from metal recycling and some from eBay sales.
Perhaps the equipment all ended up as scrap, or perhaps the kid with an interest is on his
way to a lifelong career in electronics. It worked? for me.
So, please consider making an effort to give away unwanted equipment on the chance that
it could potentially do someone more good than if it were deemed unsaleable and
buried under dirt in a landfill. For an historical context, see...
73--
Brad? AA1IP
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Re: How to dispose old electronics test equipment LEGALLY
Here I am in Mexico SEMARNAT that is similar to EPA comes to the places to review their disposals records and what to see receipts of where did you send your waste. The question is where and how the professional companies disposed it SEMARNAT suppose to check them out too like that to see how they dispose it all. I dont think they bury it as Pete said maybe burn the waste in a controlled maner and recycle whatever could be used. I have seen some youtube videos that most of it goes to Africa and India and some stuff they fix other they recycle and burn illegally in other countries IT IS A MESS.
https://www.youtube.com/watch?v=mleQVO1Vd1I
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Jeremy Nichols
Dave McGuire
Paul Bicknell