Re: Transporting a 500-Series Scope without Breaking the CRT
As long as it's strapped in so it doesn't shift on a panic stop you should be fine.
Paul
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On Sat, May 01, 2021 at 03:59:38PM -0700, Jeff Dutky wrote: Cool. Thanks Ed.
So I'll strap it right-side-up in the front seat, next to me. That should provide enough cushioning for the drive home.
I think there's a scope-mobile cart, as well, but that will fit in the back with room to spare, if the scope is up front.
-- Jeff Dutky
!DSPAM:608ddd7617561784314281!
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Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows
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I have one of the Pomona HV? metered probe that I will lend if someone needs to make a measurement.
73,
Bill , WA2DVUCape May
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On Saturday, May 1, 2021, 02:56:14 PM EDT, DaveH52 <ac2gl.dave@...> wrote:
You can try to find a HV probe like the ones used back when TV sets had CRTs (like I did). The CRT beam current shouldn't be that high so that it presents much of a load. I now recall that I did have an issue with the insulation failing on the HV flying lead. I painted it with super corona dope and mummified it with tape because replacing it seemed to be out of the question.
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Re: Transporting a 500-Series Scope without Breaking the CRT
Cool. Thanks Ed.
So I'll strap it right-side-up in the front seat, next to me. That should provide enough cushioning for the drive home.
I think there's a scope-mobile cart, as well, but that will fit in the back with room to spare, if the scope is up front.
-- Jeff Dutky
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Re: Transporting a 500-Series Scope without Breaking the CRT
If carrying it yourself, it should be just fine if not banged around or dropped. Keep it upright in its normal operating position - never haul with the face down. Ed
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Transporting a 500-Series Scope without Breaking the CRT
Any advice on what to check before transporting a 500-series scope? I know that there's some kind of clamp or brace for the CRT on these old scopes that can deteriorate with time. I'm planning to takes some closed-cell foam sheets tto brace the CRT if necessary, but I haven't found any pictures of how the CRT is mounted and would like some advanced warning.
I'll be picking the scope up tomorrow (Sunday, May 2nd), so quicker answers would be appreciated.
Thanks.
-- Jeff Dutky
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Re: Chaining power supplies together.
Say you have two or more supplies stacked to get the sum of output voltages. Fine and good. Now short the total output and think about what will happen if you have no reverse clamp protection on the individual outputs.
Ed
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Re: Chaining power supplies together.
So by protection diode, you're not talking about over-voltage, you're talking about accidentally driving another source. So a forward biased diode that would prevent current into the power supply.
That much I got. No, don't drive into the PS, either setup in parallel, or attempting to drive some other source. Yeah, I wouldn't do that. (On purpose).
Dave
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On Saturday, May 1, 2021, 02:52:35 PM PDT, Harvey White <madyn@...> wrote: Definitely.? Most power supplies take a very dim (as in permanently off) view of reverse voltage applied to their terminals.? Most also don't like to be tied to another power supply in parallel unless designed for it. If you're going to charge a battery with a Chinese (or many other types) power supply, put a series diode in so that the supply can't be fed by the battery. Harvey On 5/1/2021 5:38 PM, Ed Breya via groups.io wrote: Be sure to add an external reverse protection diode across each output, in case there isn't one built in.
Ed
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Pile of HP marked ICS for Free
I have several stock boxes full of these new bagged parts from HP.
needless to say, the packaging is most of the bulk. I can remove that to save on shipping.
are these any use to anyone for projects or experiments?
1820-0509, MC1488L Quad RS232-Line driver
1820-0708, 93L09PC Dual 4-input Multiplexer
1820-0788, 74174N Hex D-Flip Flop
1820-1627, MM74C02N Quad 2-in NOR
Free for shipping cost,
all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.
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Re: Chaining power supplies together.
Here's a specific example of what I'm thinking of doing with such a scenario:
I'd like to be able to run 465 boards on the bench to test them before reassembling on the chassis. I have a variety of power supplies available to me: TM503 with a PS503A (+/- 20v), a Systron-Donner TL8-3 bench supply that can drive 32v, and more.
Can I chain these together to make, for example, +55v without doing harm?
Dave
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On Saturday, May 1, 2021, 02:52:35 PM PDT, Harvey White <madyn@...> wrote: Definitely.? Most power supplies take a very dim (as in permanently off) view of reverse voltage applied to their terminals.? Most also don't like to be tied to another power supply in parallel unless designed for it. If you're going to charge a battery with a Chinese (or many other types) power supply, put a series diode in so that the supply can't be fed by the battery. Harvey On 5/1/2021 5:38 PM, Ed Breya via groups.io wrote: Be sure to add an external reverse protection diode across each output, in case there isn't one built in.
Ed
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Re: Chaining power supplies together.
Definitely.? Most power supplies take a very dim (as in permanently off) view of reverse voltage applied to their terminals.? Most also don't like to be tied to another power supply in parallel unless designed for it.
If you're going to charge a battery with a Chinese (or many other types) power supply, put a series diode in so that the supply can't be fed by the battery.
Harvey
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On 5/1/2021 5:38 PM, Ed Breya via groups.io wrote: Be sure to add an external reverse protection diode across each output, in case there isn't one built in.
Ed
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Re: Chaining power supplies together.
Could you elaborate Ed? Seems such diodes might need to be robust. Any particular type that's appropriate? I take it these need to have a reverse breakdown?voltage above the supply? But are there particular ones for these voltage levels? Would this be at each supply - from out to common of each?
Seems one thing to understand a reverse diode as protection in theory, another in practice.
Thanks for the input.
Dave
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On Saturday, May 1, 2021, 02:38:59 PM PDT, Ed Breya via groups.io <edbreya@...> wrote:
Be sure to add an external reverse protection diode across each output, in case there isn't one built in.
Ed
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Re: Chaining power supplies together.
Be sure to add an external reverse protection diode across each output, in case there isn't one built in.
Ed
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Chaining power supplies together.
I just want to check myself. I don't want to overlook something and break my toys:
Is it safe, and a typical thing to do, to daisy chain power supplies to get a higher voltage than any one supply can provide?
I'm talking about TM500/5000 plug-in power supplies with one or two outputs with an ungrounded common. Say I have two 20v supplies: can I tie the common of the 2nd to the output of the 1st and get 40v between the common of the 1st and the output of the 2nd? Safely?
Seems appropriate, but haven't seen it done or talked about before. I don't want to blow anything up if I'm forgetting something fundamental here.
Thanks,
Dave
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Re: My wife makes it possible for me to do this
Hi Phil,
I definitely learned a lesson when she was recuperating. Now I do most of the things you do and I also walk the dogs 4 or 5 times each day starting at 4AM! in the morning. If I'm lucky they wait until 5AM to start making noise. Because I'm walking the dogs now she can sleep until 6:00 to 6:30AM when she normally wakes up.
Dennis
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Phillip Potter Sent: Saturday, May 01, 2021 12:40 PM To: [email protected]Subject: Re: [TekScopes] My wife makes it possible for me to do this Hi Dennis, Glad to hear that she is on the mend. After 42 years of marriage, I can say this... My wife and I have taken to "thanking" each other for the things that the other does for us; like cooking, etc. I have taken on cleaning up if she cooks and visa versa. I am the sys op, driver, and geek. I take care of my own laundry, make the bed almost every day, and clean up after myself, while she takes care of the dog run (you know...). It's a shared life where I look for ways to pitch in without being asked and we are still happily married. Phil On 4/3/2021 7:15 PM, Dennis Tillman W7pF wrote: A little more than 3 weeks ago I had no idea my life was about to be
turned on its head.
Marian's hip replacement operation went extremely well as far as the
medical staff was concerned.
She was offered numerous pain medications in advance which was reassuring.
Unfortunately one by one we discovered she had adverse reactions to
each of them. There many sleepless nights spend in endless pain
followed by irrational emotional ups and downs during the days. I
spent the next 3 weeks doing everything she used to do around the
house in addition to taking care of her every need 24 / 7. Each day
ended with my being exhausted and falling into bed for a few hours before repeating the same thing again.
My aha moment came when, after 5 days of total exhaustion (me, not
her), she screamed at me "Now do you see how much I do around here so
you can sit in your room on the computer all day long?"
"It would be nice if you said thank you once in a while when I got
home from work!"
I thought better of opening my mouth at that moment to tell her all
the things I was doing:
All the cooking for both of us including food shopping; vacuuming,
laundry, dishes; feeding the dogs (they eat almost 50lbs of raw dog
food each month) twice a day, walking them 6 times per day; helping
her in and out of bed, sitting, standing, walking:, taking her almost
daily to and from appointments with physical and occupational
therapists, pain management specialists, doctors, etc; helping her
with her rehabilitation and her exercises; buying medical necessities
like canes, walkers, stools, shower seats (since she can't stand
long), back pillows, ice packs, prescriptions, etc; going into work
remotely, and eventually in person, since so many people depend on her.
The truth is undeniable: Marian makes it possible for me to be the
moderator of TekScopes, something I love to do.
3 days ago (and exactly 3 weeks after her surgery) she turned the corner.
She was sleeping through the night without pain, walking with only a
cane, eating the usual things, and going to work. For the next 6 weeks
I will still have to drive her everywhere. By now I have no problem
feeding and walking our five Golden Retrievers. They are still more
than a little upset they haven't been able to snuggle with her in bed.
Long ago we bought a California king bed so 300+ pounds of dogs could
all fit in the bed at the same time. She hinted today that she may let
one of them sleep in bed with her tomorrow night. Knowing her, a day
later she will feel sorry for the other four and let all five join her.
Dennis Tillman W7pF
-- Dennis Tillman W7pF TekScopes Moderator
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Re: My wife makes it possible for me to do this
Hi Dennis,
Glad to hear that she is on the mend.
After 42 years of marriage, I can say this...
My wife and I have taken to "thanking" each other for the things that the other does for us; like cooking, etc.
I have taken on cleaning up if she cooks and visa versa.
I am the sys op, driver, and geek. I take care of my own laundry, make the bed almost every day, and clean up after myself, while she takes care of the dog run (you know...).
It's a shared life where I look for ways to pitch in without being asked and we are still happily married.
Phil
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On 4/3/2021 7:15 PM, Dennis Tillman W7pF wrote: A little more than 3 weeks ago I had no idea my life was about to be turned
on its head.
Marian's hip replacement operation went extremely well as far as the medical
staff was concerned.
She was offered numerous pain medications in advance which was reassuring.
Unfortunately one by one we discovered she had adverse reactions to each of
them. There many sleepless nights spend in endless pain followed by
irrational emotional ups and downs during the days. I spent the next 3 weeks
doing everything she used to do around the house in addition to taking care
of her every need 24 / 7. Each day ended with my being exhausted and falling
into bed for a few hours before repeating the same thing again.
My aha moment came when, after 5 days of total exhaustion (me, not her), she
screamed at me
"Now do you see how much I do around here so you can sit in your room on the
computer all day long?"
"It would be nice if you said thank you once in a while when I got home from
work!"
I thought better of opening my mouth at that moment to tell her all the
things I was doing:
All the cooking for both of us including food shopping; vacuuming, laundry,
dishes; feeding the dogs (they eat almost 50lbs of raw dog food each month)
twice a day, walking them 6 times per day; helping her in and out of bed,
sitting, standing, walking:, taking her almost daily to and from
appointments with physical and occupational therapists, pain management
specialists, doctors, etc; helping her with her rehabilitation and her
exercises; buying medical necessities like canes, walkers, stools, shower
seats (since she can't stand long), back pillows, ice packs, prescriptions,
etc; going into work remotely, and eventually in person, since so many
people depend on her.
The truth is undeniable: Marian makes it possible for me to be the moderator
of TekScopes, something I love to do.
3 days ago (and exactly 3 weeks after her surgery) she turned the corner.
She was sleeping through the night without pain, walking with only a cane,
eating the usual things, and going to work. For the next 6 weeks I will
still have to drive her everywhere. By now I have no problem feeding and
walking our five Golden Retrievers. They are still more than a little upset
they haven't been able to snuggle with her in bed. Long ago we bought a
California king bed so 300+ pounds of dogs could all fit in the bed at the
same time. She hinted today that she may let one of them sleep in bed with
her tomorrow night. Knowing her, a day later she will feel sorry for the
other four and let all five join her.
Dennis Tillman W7pF
|
This was my uncles scope. He passed away last year. I'm going through his stuff before the property gets sold. I thought perhaps someone here on the east coast would want this one, otherwise it get loaded in the dumpsters. Too big a scope for me. The cost is zero, it's free. Needs to go to a good home to be loved.
It comes with a CA and D plugin. The drawer has some probes and other parts too. There are manuals for the 533A, CA and the D.
I suspect the last time it was used was the early 70's as there is a 1969 HeathKit catalog that has some of my uncles notes written on it that was with the manuals.
I opened up the case and saw that one resistor is burnt up, otherwise all looks good to me. All the tubes are in there.
It is located in my workshop at home in Arlington Virginia. PM if interested
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You can try to find a HV probe like the ones used back when TV sets had CRTs (like I did). The CRT beam current shouldn't be that high so that it presents much of a load. I now recall that I did have an issue with the insulation failing on the HV flying lead. I painted it with super corona dope and mummified it with tape because replacing it seemed to be out of the question.
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Can anyone use a Type Z P6023 probe?
This time I'm sure I don't need this probe.
I have a P6023 probe lying around for a long time with nothing that uses it.
It is a low capacitance probe (12pF, 8Meg Ohms, 10X attenuation, 1000V Max).
It has thumb-wheel adjustment for DC Attenuation calibration, and for AC
Compensation. It uses the threaded tips from the mid-1960s. I don't have any
of the accessories.
It was designed for the Z Plugin but it also works on any of the
differential amplifier plugins as well.
If you are interested contact me off list at dennis at ridesoft dot com.
Dennis Tillman W7pF
--
Dennis Tillman W7pF
TekScopes Moderator
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Re: Tektronix Probe Replacement Parts and Accessories
Thanks for compiling the document Dennis. I know that it takes a lot of effort to do such projects.
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Re: Tektronix Probe Replacement Parts and Accessories
Hi david,
The picture never appears in the link you provided.
However, the complete manual for the P6204 can be downloaded from TekWiki:
The manual has a complete breakdown of the probe listing every part that goes into it.
The manual is at
Dennis Tillman W7pF
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of David Sidrane Sent: Saturday, May 01, 2021 6:13 AM To: [email protected]Subject: Re: [TekScopes] Tektronix Probe Replacement Parts and Accessories Thank you Dennis! By chance do you have the part number for the TeKProbe BNC with the 2 locking rings? Shown here without the 2 locking rings. -- Dennis Tillman W7pF TekScopes Moderator
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Bill Riches
Dave Peterson
DaveH52
Tom Phillips