or Grads !
Gedas, W8BYA
Gallery at
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 8/24/2018 11:46 AM, Chris Hayes
wrote:
toggle quoted message
Show quoted text
|
Re: 8970B Noise figure unit
Hi just a thought
?
some fans use roller bearings if so try
your local model shop for replacement bearings
?
?
Has anyone changed their fan on the 8970? Mine is very noisy and likely
to fail soon. Original is a Dryco 411M-11, 30CFM, 115V.
Kevin
No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15883 - Release Date: 08/14/18
|
Ok. thanks for the info...........BUT
?
I removed the Cap and have it in front of me as I type:
?
It says on the can:
?
Sprague
0180-3209
53D190
24000UF20VDC
-10+75%
+85C 9050H
Made in USA
?
The ONLY difference is on the Schemaitc and part list it says .013F. (ie:
13000) so there must have been a up-grade I have not found.
?
The size is:
?
4.12-in long (104.6mm)
1.128-in diam. (28.66mm)
with Axial leads
?
All the ones I have found are for screw mount and are WAY to large to fit
on the A10 board.
?
Thanks,
?
Chuck McClurg
Communications, Ltd
Carson City, NV
N7UVZ
?
|
|
|
Has anyone changed their fan on the 8970? Mine is very noisy and likely to fail soon. Original is a Dryco 411M-11, 30CFM, 115V.
Kevin
|
Just be glad they didn’t use zero crossings.
Peter
toggle quoted message
Show quoted text
On Aug 24, 2018, at 10:47 AM, Chuck Harris <cfharris@...> wrote:
Personally, I was off put when they chose
Hertz as the new cycle. I always thought
wiggle was a better unit, as in megawiggles,
and gigawiggles.
-Chuck Harris
W2HX wrote:
how about KMC? kilomegacycles for GHz!
________________________________________
From: [email protected] <[email protected]> on behalf of Chuck Harris <cfharris@...>
Sent: Friday, August 24, 2018 8:03 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 8656B
Ok, I'm trying hard to figure out what you think is so
odd, or special about a 0.013F capacitor.
1,000,000uF = 1.0F
100,000uF = 0.1F
10,000uF = 0.01F
1,000uF = 0.001F
0.013F is 13,000uF, which is rather common in circuits of
this sort.
|
Personally, I was off put when they chose
Hertz as the new cycle. I always thought
wiggle was a better unit, as in megawiggles,
and gigawiggles.
-Chuck Harris
W2HX wrote:
toggle quoted message
Show quoted text
how about KMC? kilomegacycles for GHz!
________________________________________
From: [email protected] <[email protected]> on behalf of Chuck Harris <cfharris@...>
Sent: Friday, August 24, 2018 8:03 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 8656B
Ok, I'm trying hard to figure out what you think is so
odd, or special about a 0.013F capacitor.
1,000,000uF = 1.0F
100,000uF = 0.1F
10,000uF = 0.01F
1,000uF = 0.001F
0.013F is 13,000uF, which is rather common in circuits of
this sort.
|
Re: HP 8656B capacitor units
Hayt and Kemmerly, indeed.? I think the best written textbook used in my formal education, along with Ralph J. Smith's "Circuits, Devices, and Systems".? Both are still in my library, and come off the shelf when I feel the need to refresh the "core".
Dave
|
But you don’t require 22 F? I believe you
require 22000 uF?
?
?
Yeah, but that is 0.022F, not 22F :)
24 aug. 2018 kl. 05:02 skrev Paul Bicknell <paul@...>:
Hi all this is easy? as I have just
been through the same problem but not for HP equipment
?
Kemet do a large rang of capacitors?
dependent on the size / mounting arrangement and terminals
?
For example? 40 v at 22000 uF?
at 36 * 82 mm? screw terminals part number ALS30223DE040??
?or stud mounting ALS31223DE040
Distributor ?is Mouser? please
note can and stud is connected to – terminal
?
Regards Paul? B
?
?
Although since DigiKey sells aluminum electrolytics up to 2.2F at 20V,
at a cost of ~1/4k$ perhaps you do have 24F@40V. I imagine it would cost more
than a thousand bucks, but I didn’t search anywhere else. I can’t imagine that
those would let you discharge them very fast without destroying ?the metal
electrode.
24F@40V is about 4% of a stick of dynamite if quickly discharged — but
would any small (order of a soup can size) capacitor like that not have
relatively high ESR??
24 aug. 2018 kl. 01:38
skrev Kuba Ober <kuba@...>:
How big is that cap, size-wise? It’s unlikely to be a supercapacitor
for such voltage in anything older than a few years or so, I’d bet. It’s a typo
in the PL, and a common use of M for micro. Happens all the time. You’re
looking at 24,000uF @ 40V. Modern part will possibly be smaller than the one it
will replaces. I have seen a 100F 48V array about 20 years ago, and it was
rack-sized. That rating was with all modules connected in parallel, but they
could be connected in series, too.?
I have to thank you all for your advice on the Surge Suppressor for my
bench.? I will got through all the answers and see what will work best for
my Bench.
I was working on my 8656B tonight and found that I have about 1 VOLT of
ac on the +5V line!!!? This shows that C18 could be bad.? BUT? I
had to look it up in the Parts List as I was flabbergasted when I read the
value.............................13,000Mf at 40V....................................
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!!
And of course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
Where/how am I going to come up with one of those I have no idea!
Hope someone can give me a clue as to what to do next, with out having
to buy another 8656B for "parts" and hope it will have a good C18!
No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15883 - Release Date: 08/14/18
No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15883 - Release Date: 08/14/18
|
Re: HP 8656B capacitor units
And I remember the red and black sign in electrical shop class:
"Danger, 10,000 Ohms"
Dave
toggle quoted message
Show quoted text
On 8/24/2018 9:51 AM, Brad Thompson wrote: Hello--
Back in the day, an introductory Electrical Engineering textbook
(e.g., Hayt and Kemmerly) started off using units of basic values
for? examples.
Hence, a circuit would contain, say, a one-Ohm resistor, a one Henry inductor, and
a one Farad capacitor.
One of my classmates expressed excitement at discovering? a 100-Ohm resistor,
which he thought was phenomenal.
The next day, I brought in a 10-megohm resistor, a 10-pF capacitor
and a one millihenry inductor. Over a cuppa of coffee, I filled him in
about real-world component values<g>.
73--
Brad? AA1IP
|
Re: HP 8656B capacitor units
Hello--
Back in the day, an introductory Electrical Engineering textbook
(e.g., Hayt and Kemmerly) started off using units of basic values
for examples.
Hence, a circuit would contain, say, a one-Ohm resistor, a one Henry inductor, and
a one Farad capacitor.
One of my classmates expressed excitement at discovering a 100-Ohm resistor,
which he thought was phenomenal.
The next day, I brought in a 10-megohm resistor, a 10-pF capacitor
and a one millihenry inductor. Over a cuppa of coffee, I filled him in
about real-world component values<g>.
73--
Brad AA1IP
|
how about KMC? kilomegacycles for GHz! ________________________________________ From: [email protected] < [email protected]> on behalf of Chuck Harris <cfharris@...> Sent: Friday, August 24, 2018 8:03 AM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] HP 8656B Ok, I'm trying hard to figure out what you think is so odd, or special about a 0.013F capacitor. 1,000,000uF = 1.0F 100,000uF = 0.1F 10,000uF = 0.01F 1,000uF = 0.001F 0.013F is 13,000uF, which is rather common in circuits of this sort. Mouser has them in the old computer grade electrolytic cans for about 26 bucks, and in the modern snap in style for about 14 bucks... much higher voltage ratings to boot. [As an aside, capitalization means everything in these units: "m" = milli, which is 0.001x "M" = mega, which is 1,000,000x "u" = micro, which is 0.000001x Respect makes some of us capitalize the units name: F rather than f for Farad B rather than b for Bell A rather than a for Ampere V rather than v for Volt H rather than h for Hertz S rather than s for Siemens... Confusion reigned when MFD meant uF in a world that didn't do lower case letters on labels, and MMF meant micro micro Farad, which was a millionth of a millionth of a Farad... ] It almost certainly doesn't need to be 40V, probably 20V is more like it... but I have seen some electric furnaces masquerading as linear power supplies in the past. The biggest problem I find in these supplies is trying to fit a modern, cheap radial leaded electrolytic into a circuit built for one of the old very expensive "computer grade electrolytic" capacitor footprints. Typically, the new capacitors are so much smaller that you need to come up with a physical adapter to allow them to clamp into the space of the original. -Chuck Harris Chuck wrote: I have to thank you all for your advice on the Surge Suppressor for my bench. I will got through all the answers and see what will work best for my Bench.
BUT....................
I was working on my 8656B tonight and found that I have about 1 VOLT of ac on the +5V line!!! This shows that C18 could be bad. BUT I had to look it up in the Parts List as I was flabbergasted when I read the value.............................13,000Mf at 40V....................................
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!! And of course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
Where/how am I going to come up with one of those I have no idea!
Hope someone can give me a clue as to what to do next, with out having to buy another 8656B for "parts" and hope it will have a good C18!
Thanks,
Chuck McClurg
Communications, Ltd.
Carson City, NV
N7UVZ
|
Check your units, .024F = 24mF = 24,000uF.?
Dave
|
I somehow didn’t run into the xxxF notation, where the first digit is 10^-1. Writing 13mF as 013F would be be IMHO crazy. I’d understand 0F13. But of course I didn’t notice the decimal point in front of the zero in Chuck McC’s post — he seemingly was aware that it was not 13F, perhaps. Only one mention had the correct scaling. I think that in this day and age, all electrolytics can afford to have the capacity written in SI units with international standard scale suffixes. With a zero leading the decimal point, if applicable. It’s extremely easy to misread, say .200F as 200F :) Especially after a long day. I imagine over the years some lives and/or lots of money must have been lost to mishaps of that kind. A space probe, even :)
Cheers, Kuba
toggle quoted message
Show quoted text
24 aug. 2018 kl. 08:03 skrev Chuck Harris <cfharris@...>:
Ok, I'm trying hard to figure out what you think is so
odd, or special about a 0.013F capacitor.
1,000,000uF = 1.0F
100,000uF = 0.1F
10,000uF = 0.01F
1,000uF = 0.001F
0.013F is 13,000uF, which is rather common in circuits of
this sort.
Mouser has them in the old computer grade electrolytic cans
for about 26 bucks, and in the modern snap in style for about
14 bucks... much higher voltage ratings to boot.
[As an aside, capitalization means everything in these
units:
"m" = milli, which is 0.001x
"M" = mega, which is 1,000,000x
"u" = micro, which is 0.000001x
Respect makes some of us capitalize the units name:
F rather than f for Farad
B rather than b for Bell
A rather than a for Ampere
V rather than v for Volt
H rather than h for Hertz
S rather than s for Siemens...
Confusion reigned when MFD meant uF in a world that didn't
do lower case letters on labels, and MMF meant micro micro
Farad, which was a millionth of a millionth of a Farad...
]
It almost certainly doesn't need to be 40V, probably 20V is
more like it... but I have seen some electric furnaces
masquerading as linear power supplies in the past.
The biggest problem I find in these supplies is trying to
fit a modern, cheap radial leaded electrolytic into a circuit
built for one of the old very expensive "computer grade
electrolytic" capacitor footprints. Typically, the new
capacitors are so much smaller that you need to come up with
a physical adapter to allow them to clamp into the space of
the original.
-Chuck Harris
Chuck wrote:
I have to thank you all for your advice on the Surge Suppressor for my bench. I will got through all the answers and see what will work best for my Bench.
BUT....................
I was working on my 8656B tonight and found that I have about 1 VOLT of ac on the +5V line!!! This shows that C18 could be bad. BUT I had to look it up in the Parts List as I was flabbergasted when I read the value.............................13,000Mf at 40V....................................
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!! And of course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
Where/how am I going to come up with one of those I have no idea!
Hope someone can give me a clue as to what to do next, with out having to buy another 8656B for "parts" and hope it will have a good C18!
Thanks,
Chuck McClurg
Communications, Ltd.
Carson City, NV
N7UVZ
|
Yeah, but that is 0.022F, not 22F :)
Cheers, Kuba 24 aug. 2018 kl. 05:02 skrev Paul Bicknell < paul@...>:
toggle quoted message
Show quoted text
Hi all this is easy? as I have just
been through the same problem but not for HP equipment
?
Kemet do a large rang of capacitors? dependent
on the size / mounting arrangement and terminals
?
For example? 40 v at 22000 uF?
at 36 * 82 mm? screw terminals part number ALS30223DE040?? ?or
stud mounting ALS31223DE040
Distributor ?is Mouser? please
note can and stud is connected to – terminal
?
Regards Paul? B
?
?
Although since DigiKey sells aluminum electrolytics up to 2.2F at 20V,
at a cost of ~1/4k$ perhaps you do have 24F@40V. I imagine it would cost more
than a thousand bucks, but I didn’t search anywhere else. I can’t
imagine that those would let you discharge them very fast without destroying
?the metal electrode.
24F@40V is about 4% of a stick of dynamite if quickly discharged
— but would any small (order of a soup can size) capacitor like that not
have relatively high ESR??
24 aug. 2018 kl. 01:38
skrev Kuba Ober <kuba@...>:
How big is that cap, size-wise? It’s unlikely to be a
supercapacitor for such voltage in anything older than a few years or so,
I’d bet. It’s a typo in the PL, and a common use of M for micro.
Happens all the time. You’re looking at 24,000uF @ 40V. Modern part will
possibly be smaller than the one it will replaces. I have seen a 100F 48V array
about 20 years ago, and it was rack-sized. That rating was with all modules
connected in parallel, but they could be connected in series, too.?
I have to thank you all for your advice on the Surge Suppressor for my
bench.? I will got through all the answers and see what will work best for
my Bench.
I was working on my 8656B tonight and found that I have about 1 VOLT of
ac on the +5V line!!!? This shows that C18 could be bad.? BUT? I
had to look it up in the Parts List as I was flabbergasted when I read the value.............................13,000Mf
at 40V....................................
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!!
And of course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
Where/how am I going to come up with one of those I have no idea!
Hope someone can give me a clue as to what to do next, with out having
to buy another 8656B for "parts" and hope it will have a good C18!
No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15883 - Release Date: 08/14/18
|
Ok, I'm trying hard to figure out what you think is so
odd, or special about a 0.013F capacitor.
1,000,000uF = 1.0F
100,000uF = 0.1F
10,000uF = 0.01F
1,000uF = 0.001F
0.013F is 13,000uF, which is rather common in circuits of
this sort.
Mouser has them in the old computer grade electrolytic cans
for about 26 bucks, and in the modern snap in style for about
14 bucks... much higher voltage ratings to boot.
[As an aside, capitalization means everything in these
units:
"m" = milli, which is 0.001x
"M" = mega, which is 1,000,000x
"u" = micro, which is 0.000001x
Respect makes some of us capitalize the units name:
F rather than f for Farad
B rather than b for Bell
A rather than a for Ampere
V rather than v for Volt
H rather than h for Hertz
S rather than s for Siemens...
Confusion reigned when MFD meant uF in a world that didn't
do lower case letters on labels, and MMF meant micro micro
Farad, which was a millionth of a millionth of a Farad...
]
It almost certainly doesn't need to be 40V, probably 20V is
more like it... but I have seen some electric furnaces
masquerading as linear power supplies in the past.
The biggest problem I find in these supplies is trying to
fit a modern, cheap radial leaded electrolytic into a circuit
built for one of the old very expensive "computer grade
electrolytic" capacitor footprints. Typically, the new
capacitors are so much smaller that you need to come up with
a physical adapter to allow them to clamp into the space of
the original.
-Chuck Harris
Chuck wrote:
toggle quoted message
Show quoted text
I have to thank you all for your advice on the Surge Suppressor for my bench. I will got through all the answers and see what will work best for my Bench.
BUT....................
I was working on my 8656B tonight and found that I have about 1 VOLT of ac on the +5V line!!! This shows that C18 could be bad. BUT I had to look it up in the Parts List as I was flabbergasted when I read the value.............................13,000Mf at 40V....................................
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!! And of course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
Where/how am I going to come up with one of those I have no idea!
Hope someone can give me a clue as to what to do next, with out having to buy another 8656B for "parts" and hope it will have a good C18!
Thanks,
Chuck McClurg
Communications, Ltd.
Carson City, NV
N7UVZ
|
Hi all this is easy? as I have just
been through the same problem but not for HP equipment
?
Kemet do a large rang of capacitors? dependent
on the size / mounting arrangement and terminals
?
For example? 40 v at 22000 uF?
at 36 * 82 mm? screw terminals part number ALS30223DE040?? ?or
stud mounting ALS31223DE040
Distributor ?is Mouser? please
note can and stud is connected to – terminal
?
Regards Paul? B
?
?
Although since DigiKey sells aluminum electrolytics up to 2.2F at 20V,
at a cost of ~1/4k$ perhaps you do have 24F@40V. I imagine it would cost more
than a thousand bucks, but I didn’t search anywhere else. I can’t
imagine that those would let you discharge them very fast without destroying
?the metal electrode.
24F@40V is about 4% of a stick of dynamite if quickly discharged
— but would any small (order of a soup can size) capacitor like that not
have relatively high ESR??
24 aug. 2018 kl. 01:38
skrev Kuba Ober <kuba@...>:
How big is that cap, size-wise? It’s unlikely to be a
supercapacitor for such voltage in anything older than a few years or so,
I’d bet. It’s a typo in the PL, and a common use of M for micro.
Happens all the time. You’re looking at 24,000uF @ 40V. Modern part will
possibly be smaller than the one it will replaces. I have seen a 100F 48V array
about 20 years ago, and it was rack-sized. That rating was with all modules
connected in parallel, but they could be connected in series, too.?
I have to thank you all for your advice on the Surge Suppressor for my
bench.? I will got through all the answers and see what will work best for
my Bench.
I was working on my 8656B tonight and found that I have about 1 VOLT of
ac on the +5V line!!!? This shows that C18 could be bad.? BUT? I
had to look it up in the Parts List as I was flabbergasted when I read the value.............................13,000Mf
at 40V....................................
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!!
And of course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
Where/how am I going to come up with one of those I have no idea!
Hope someone can give me a clue as to what to do next, with out having
to buy another 8656B for "parts" and hope it will have a good C18!
No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15883 - Release Date: 08/14/18
|
Although since DigiKey sells aluminum electrolytics up to 2.2F at 20V, at a cost of ~1/4k$ perhaps you do have 24F@40V. I imagine it would cost more than a thousand bucks, but I didn’t search anywhere else. I can’t imagine that those would let you discharge
them very fast without destroying ?the metal electrode.
24F@40V is about 4% of a stick of dynamite if quickly discharged — but would any small (order of a soup can size) capacitor like that not have relatively high ESR??
Cheers, Kuba
24 aug. 2018 kl. 01:38 skrev Kuba Ober < kuba@...>:
toggle quoted message
Show quoted text
How big is that cap, size-wise? It’s unlikely to be a supercapacitor for such voltage in anything older than a few years or so, I’d bet. It’s a typo in the PL, and a common use of M for micro. Happens all the time. You’re looking at 24,000uF @ 40V. Modern
part will possibly be smaller than the one it will replaces. I have seen a 100F 48V array about 20 years ago, and it was rack-sized. That rating was with all modules connected in parallel, but they could be connected in series, too.?
Good luck! — Kuba Ober
I have to thank you all for your advice on the Surge Suppressor for my bench.? I will got through all the answers and see what will work best for my Bench.
?
BUT....................
?
I was working on my 8656B tonight and found that I have about 1 VOLT of ac on the +5V line!!!? This shows that C18 could be bad.? BUT? I had to look it up in the Parts List as I was flabbergasted when I read the value.............................13,000Mf
at 40V....................................
?
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!! And of course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
?
Where/how am I going to come up with one of those I have no idea!
?
Hope someone can give me a clue as to what to do next, with out having to buy another 8656B for "parts" and hope it will have a good C18!
?
Thanks,
?
Chuck McClurg
Communications, Ltd.
Carson City, NV
N7UVZ
?
|
How big is that cap, size-wise? It’s unlikely to be a supercapacitor for such voltage in anything older than a few years or so, I’d bet. It’s a typo in the PL, and a common use of M for micro. Happens all the time. You’re looking at 24,000uF @ 40V. Modern part will possibly be smaller than the one it will replaces. I have seen a 100F 48V array about 20 years ago, and it was rack-sized. That rating was with all modules connected in parallel, but they could be connected in series, too.?
Good luck! — Kuba Ober
toggle quoted message
Show quoted text
I have to thank you all for your advice on the Surge Suppressor for my
bench.? I will got through all the answers and see what will work best for
my Bench.
?
BUT....................
?
I was working on my 8656B tonight and found that I have about 1 VOLT of ac
on the +5V line!!!? This shows that C18 could be bad.? BUT? I had
to look it up in the Parts List as I was flabbergasted when I read the
value.............................13,000Mf at
40V....................................
?
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!! And of
course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
?
Where/how am I going to come up with one of those I have no idea!
?
Hope someone can give me a clue as to what to do next, with out having to
buy another 8656B for "parts" and hope it will have a good C18!
?
Thanks,
?
Chuck McClurg
Communications, Ltd.
Carson City, NV
N7UVZ
?
|
Digikey has some in that range, but they are between $40 and $85. Hope this link works.
Probably cheaper than a parts unit, and a parts unit may have the same bad parts. Maybe look on eBay but that is a crapshoot, but at that price....
Good luck Mark
On Thu, Aug 23, 2018 at 10:36 PM, Chuck <j-mcclurg@...> wrote:
I have to thank you all for your advice on the Surge Suppressor for my
bench.? I will got through all the answers and see what will work best for
my Bench.
?
BUT....................
?
I was working on my 8656B tonight and found that I have about 1 VOLT of ac
on the +5V line!!!? This shows that C18 could be bad.? BUT? I had
to look it up in the Parts List as I was flabbergasted when I read the
value.............................13,000Mf at
40V....................................
?
I looked in the PL and, Yep, it says A10C19 is .013F at 40Volts!!!!! And of
course mine has to have been upgraded as it has a 24,000MF cap in it!!!!
?
Where/how am I going to come up with one of those I have no idea!
?
Hope someone can give me a clue as to what to do next, with out having to
buy another 8656B for "parts" and hope it will have a good C18!
?
Thanks,
?
Chuck McClurg
Communications, Ltd.
Carson City, NV
N7UVZ
?
|
Paul Bicknell
Chris Hayes