On 7/26/2018 10:20 AM, satbeginner wrote: Hi all,
Bruce, thanks for your addition, for now I only can test "dry", so without the PS actually working, because the FET's and diode's are not here yet.
But I did some measurements on the driver signal driving the gate of the FET (without a FET installed)
The switcher in my scope does free run at 66,5kHz / 15usec, and delivers zero-going OFF-pulses with a 2usec width.
Rise and fall times are about 100nsec each.
I measured the same signals, but now with a 1nF capacitor installed at the G-S pins.
Basically, what I see is that there is no difference in the rise-and-fall times, only the high level (in between the low 2usec pulses) becomes a bit dirty.
But since the FET is switching ON around 3,5V - 4V, the part of the signal that becomes dirty is way beyond the point where the FET switches "ON", so that should not be a problem.
So, my (probably) premature conclusion is: the FET I ordered should work fine.
It's capacity does not have any effect on the rise-and-fall times, it's own turn-on time is way smaller than the applied pulse, and the ON-resistance is lower, so dissipation should be lower.
But, we all know Mr. Murphy (only few people know he actually was an optimist) so -as always- the proof of the pudding will be in the eating....
I took some pictures of the signals and I put them in the album again: /g/TekScopes/album?id=64919&p=pcreated,,,20,1,0,0
To be continued,
Un saludo,
Leo
"I measured the same signals, but now with a 1nF capacitor installed at the G-S pins. Basically, what I see is that there is no difference in the rise-and-fall times," I find this somewhat amazing, because when I did the same test, I did see a much larger difference between having the cap in or out. Unfortunately, I can't pull up any pictures from that time but that was from several years ago and senior memory (84Y) doesn't improve with time. You might even think about doing a ringing test on the transformer, I've replaced a few of these over the years. -Bert
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Re: Looking for Power Cord for 400-series Scope
The Heyco reference was mine. They make those plastic, snap in strain reliefs.
It looks like the original Belden part number was: KH5442-290D I found this by searching the Tektronix part number and locating the NSN references. Unfortunately, the description is vague. It is listed as three conductor, and 7.5 feet long with stripped leads on one end.
Michael A. Terrell
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-----Original Message----- From: "Colin Herbert via Groups.Io" <colingherbert@...>
Sent: Jul 26, 2018 12:18 PM
To: [email protected]
Subject: Re: [TekScopes] Looking for Power Cord for 400-series Scope
Back in February of this year, there was a similar thread titled "Replacing power cords..." There were some ideas there, including a source called Heyco (?)
Good Luck, Colin.
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Re: Compatibility between Series-5000 and TM500/TM5000 latches
Actually I was asking about compatibility of 7000 series scope plug-in latches with 5000 series scope plug-ins.? ?Not TM500/5000 series modules.? ?But I can check for myself this evening when I get home from work.?
Thanks.
Jim
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: "Colin Herbert via Groups.Io" <colingherbert@...> Date: 7/26/18 8:58 AM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Compatibility between Series-5000 and TM500/TM5000 latches Jim, I have a 7623A scope with about 13 plug-ins and a TM503 and TM504 with four plug-ins (and another to come). I can tell you that the latches for the 7000-series and TM500-series are NOT the same. I hope that clears up some of your queries. Colin. -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Jim Ford Sent: 26 July 2018 16:39 To: [email protected]Subject: Re: [TekScopes] Compatibility between Series-5000 and TM500/TM5000 latches Following with interest because I own a 5103N/D10 with two 5A15N and one 5B10N plug-in from which a previous owner removed the latching mechanisms.? Didn't want somebody removing the plug-ins, I guess. Well, I would really like to have the latching mechanisms if possible.? Wondering if the mechanisms are the same on the 7000 series plug-ins I have. Thanks. Jim.
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Re: Looking for Power Cord for 400-series Scope
Back in February of this year, there was a similar thread titled "Replacing power cords..." There were some ideas there, including a source called Heyco (?)
Good Luck, Colin.
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Phillip Potter Sent: 26 July 2018 04:56 To: [email protected]Subject: Re: [TekScopes] Looking for Power Cord for 400-series Scope I wish to add my two cents... I purchased some power cord to replace the butched one on my 453 (w/ same wire specs) only to find that it was too big (overall size) to fit the cable clamp on the scope! I was forced to whittle the outside sheath down to get it to fit... I was not happy but did end up with a cord that included a plug with a cord holder. I learned my lesson; never assume... I know, I know! Phil
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Re: Compatibility between Series-5000 and TM500/TM5000 latches
Jim,
I have a 7623A scope with about 13 plug-ins and a TM503 and TM504 with four plug-ins (and another to come). I can tell you that the latches for the 7000-series and TM500-series are NOT the same. I hope that clears up some of your queries.
Colin.
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Jim Ford Sent: 26 July 2018 16:39 To: [email protected]Subject: Re: [TekScopes] Compatibility between Series-5000 and TM500/TM5000 latches Following with interest because I own a 5103N/D10 with two 5A15N and one 5B10N plug-in from which a previous owner removed the latching mechanisms. Didn't want somebody removing the plug-ins, I guess. Well, I would really like to have the latching mechanisms if possible. Wondering if the mechanisms are the same on the 7000 series plug-ins I have. Thanks. Jim.
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Tek 495P A54 Memory Board Option Switch Settings for v9.7 Firmware
I am continuing to troubleshoot an A54 memory board for a 495P and have run into conflicting info re settings of option switch S1050 on this board. Four different sources seem to give conflicting settings, and these settings do not correspond to what seems to work in my 495P. Two of my sources are service manuals and two are notes published on the web. I am assuming that the references to settings correspond to the switch numbers embossed on the DIP switch, and the Open/Closed designation corresponds to the Open marking on the DIP switch. With a known good memory board installed, and SW 4 Open, all other switches closed, the SA boot up with a message indicating a 495P with v9.7 firmware and works as expected. When I change SW 4 to Closed, with all other switches Closed, it boots up as a 492AP with v9.7 firmware, 492P initial settings on the screen, and a Tuning Error - First LO error message. According to the service manual, SW 4 enables/disables power on SRQ, which doesn't seem relevant to distinguishing a 495 from a 492AP. I have checked the function switches multiple times with an ohmmeter and they seem to function as expected. I am looking for some definitive guidance on setting these switches.
Rick
K8EZB.
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Andre,
In the late 1960¡¯s I was in the Navy an sailed to the UK. There I met folks who had connections to Guernsey and I got a genuine Guernsey sweater. The thing came with the story that each village had a unique pattern woven into the sweater so that the body of a lost fisherman could be identified as to his town.
Roy
Roy Morgan
k1lky68@... <mailto:k1lky68@...>
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On Jul 24, 2018, at 5:56 AM, Andre de guerin via Groups.Io <testing_h@... <mailto:testing_h@...>> wrote:
Tiny island near France, called Guernsey.
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Re: Compatibility between Series-5000 and TM500/TM5000 latches
Following with interest because I own a 5103N/D10 with two 5A15N and one 5B10N plug-in from which a previous owner removed the latching mechanisms.? Didn't want somebody removing the plug-ins, I guess.
Well, I would really like to have the latching mechanisms if possible.? Wondering if the mechanisms are the same on the 7000 series plug-ins I have.
Thanks.
Jim
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: "Colin Herbert via Groups.Io" <colingherbert@...> Date: 7/26/18 8:14 AM (GMT-08:00) To: [email protected] Subject: [TekScopes] Compatibility between Series-5000 and TM500/TM5000 latches Hi, I know there have been enquiries as to whether the back-plane connections of these two series are compatible, but that is not the question that I am asking. I am wondering if the mechanical latching mechanism, with all of its parts, is the same between these series. The manuals are not very clear. Does anyone have any information on this? I am interested because I am considering buying a parts-donor 5A22N to provide latch components for my FG 504. TIA, Colin.
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Re: Looking for Power Cord for 400-series Scope
Some of those cords are shielded, which makes them both larger and stiffer.
I have hundreds of old IEC C13 cords in storage. Next time I can get to them, I'll see if any have the keeper.
Michael A. Terrell
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-----Original Message----- From: n4buq <n4buq@...>
Sent: Jul 26, 2018 11:00 AM
To: [email protected]
Subject: Re: [TekScopes] Looking for Power Cord for 400-series Scope
I've considered cutting an IEC cord (hopefully finding a thinner version since, as you point out, the more common styles are thicker) and just using a common velcro wrap as a "keeper". The clip would be nice but having that ground connection is more important to me.
Thanks,
Barry - N4BUQ
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Compatibility between Series-5000 and TM500/TM5000 latches
Hi,
I know there have been enquiries as to whether the back-plane connections of these two series are compatible, but that is not the question that I am asking. I am wondering if the mechanical latching mechanism, with all of its parts, is the same between these series. The manuals are not very clear. Does anyone have any information on this? I am interested because I am considering buying a parts-donor 5A22N to provide latch components for my FG 504.
TIA, Colin.
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Re: All TekScopes email sent to Spam
Hi Dennis,
I am well aware of that, and my email, according to spamhaus, was in the
list. And, I know who put it there, because he smugly told me he did it.
To get out of the list, spamhaus requires you give them your name, real
verifiable address, phone number, and a bunch of other stuff that I would
have to be insane to trust they would not abuse.
The sad point is that a single person, can get spamhaus to put an email
into the blackhole forever with no evidence of any wrongdoing.
Spamhaus is a group of Social Justice Warriors, and like SJW's everywhere,
they don't allow little things like facts to get in the way of their
mission.
It has nothing to do with the user's ISP, purely the email address.
I know this because my email provider gave me the same username with
rcn.com, starpower.com, and erols.com. Only the latter was blocked.
I got out of the list when I threatened both Verizon and yahoo with a
lawsuit for unlawfully blocking me from my customers, and more importantly
my aged mother.
-Chuck Harris
Dennis Tillman W7PF wrote:
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Hi Chuck,
A common misconception is that an email Sender whose IP address is listed on a DNSBL (Domain Name System-based Blackhole List) is 'blocked' from sending out email. In fact Senders are in no way prevented by DNSBLs from sending email. The Spamhaus DNSBLs are used only by RECEIVING mail systems on private networks and are used voluntarily.
Spamhaus does not tell a 3rd-party mail system what to do with an item of email, the 3rd-party mail system asks Spamhaus for an opinion and Spamhaus responds to that request with its opinion. In effect the receiving mail server asks the Spamhaus DNSBL "Does this Sender's IP Address exist on the Spamhaus database?", the Spamhaus DNSBL simply responds with a "Yes" if present or, if not present does not respond at all (no response means "we have no opinion on that IP Address").
Dennis Tillman W7PF
-----Original Message-----
From: Chuck Harris
Sent: Thursday, July 26, 2018 5:33 AM <snip>
A long while ago, I engaged in an email conversation with a group member
that did not like what I had to say, and rather than talk to me about
it, he reported my email address to the misguided SJW folks at spamhaus.
From that point on, my email was rejected by every ISP that used their
lists of "known" spammers to "protect" their customers. Verizon FIOS
accounts were, at that time, using yahoo as their email system, and they
were one of the ISPs that were using the spamhaus lists.
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Re: Looking for Power Cord for 400-series Scope
I've considered cutting an IEC cord (hopefully finding a thinner version since, as you point out, the more common styles are thicker) and just using a common velcro wrap as a "keeper". The clip would be nice but having that ground connection is more important to me.
Thanks,
Barry - N4BUQ
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Show quoted text
----- Original Message ----- From: "Michael A. Terrell" <mike.terrell@...>
To: [email protected]
Sent: Thursday, July 26, 2018 9:54:49 AM
Subject: Re: [TekScopes] Looking for Power Cord for 400-series Scope
They were quite common at one time. They used a thinner outer jacket to make
them more flexible. Some computer power cords are similar, and you could cut
off the IEC C13 connector.
At one time, I worked for an asset recovery company, and we sold those used
Belden cords in batches of 100 from scrapped computer terminals and other
minicomputer hardware.
Does anyone have a '70s or '80s Belden catalog to look up the specs?
Michael A. Terrell
-----Original Message-----
From: n4buq <n4buq@...>
Sent: Jul 26, 2018 8:18 AM
To: [email protected]
Subject: Re: [TekScopes] Looking for Power Cord for 400-series Scope
The manual I have shows a Belden number. I looked for that as well but no
luck.
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "Michael A. Terrell" <mike.terrell@...>
To: [email protected]
Sent: Wednesday, July 25, 2018 11:12:38 PM
Subject: Re: [TekScopes] Looking for Power Cord for 400-series Scope
Wasn't Tek using Belden power cords at that time?
Michael A. Terrell
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Re: Looking for Power Cord for 400-series Scope
They were quite common at one time. They used a thinner outer jacket to make them more flexible. Some computer power cords are similar, and you could cut off the IEC C13 connector.
At one time, I worked for an asset recovery company, and we sold those used Belden cords in batches of 100 from scrapped computer terminals and other minicomputer hardware.
Does anyone have a '70s or '80s Belden catalog to look up the specs?
Michael A. Terrell
toggle quoted message
Show quoted text
-----Original Message----- From: n4buq <n4buq@...>
Sent: Jul 26, 2018 8:18 AM
To: [email protected]
Subject: Re: [TekScopes] Looking for Power Cord for 400-series Scope
The manual I have shows a Belden number. I looked for that as well but no luck.
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "Michael A. Terrell" <mike.terrell@...>
To: [email protected]
Sent: Wednesday, July 25, 2018 11:12:38 PM
Subject: Re: [TekScopes] Looking for Power Cord for 400-series Scope
Wasn't Tek using Belden power cords at that time?
Michael A. Terrell
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Re: When Posting Photos Please include the following...
I prefer to keep the text of discussions and the relevant pictures together, so I create an album on Tekscopes first, then put the pictures in, copy the URL to the album from my browser, and use that URL in my messages.
With respect to the future, I prefer to user the Tekscopes album feature, this way the pictures will be available for all users of Tekscopes since they are already logged in inGroups.io, and if I some day do something stupid with my Goofle account, at least the pictures are safe.. :-)
Leo
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Re: When Posting Photos Please include the following...
I'm lazy and most times can't be bothered to log into groups.io, let alone search for some photo. Unless you provide a freely available direct link I probably won't look at it. I realize that is no great loss to anyone, but just wanted to point out if you want your photos seen a direct link (ideally with no login) is in your own interest. There are many free services that host photos and let you share them via a URL, such as google photos. Tinypic also worked great but now they have annoying ads. For archival purposes the group photo space might be ideal, but for accessibility it's almost as bad as Yahoo was. ST On Thu, Jul 26, 2018 at 4:08 PM, Dennis Tillman W7PF <dennis@...> wrote: Just a reminder:
If you announce to TekScopes members that you posted photo(s) to a TekScopes
photo album please include a link to their exact location, the title of the
photo album, and if it was created some time prior to your post date, the
creation date of the album.
If you take a moment to these three things in your announcement it will save
everyone interested in looking at your photos the time it takes to hunt
through the photo albums.
Yes, I know you can order the albums by date created or by title. Don't
assume your photo album will be looked at immediately in which case it can
be quickly found by creation date. Consider the case where someone reads
your post years later and wants to see the photos.
Dennis Tillman W7PF
--
Dennis Tillman W7PF
TekScopes Moderator
|
Hi all, Bruce, thanks for your addition, for now I only can test "dry", so without the PS actually working, because the FET's and diode's are not here yet. But I did some measurements on the driver signal driving the gate of the FET (without a FET installed) The switcher in my scope does free run at 66,5kHz / 15usec, and delivers zero-going OFF-pulses with a 2usec width. Rise and fall times are about 100nsec each. I measured the same signals, but now with a 1nF capacitor installed at the G-S pins. Basically, what I see is that there is no difference in the rise-and-fall times, only the high level (in between the low 2usec pulses) becomes a bit dirty. But since the FET is switching ON around 3,5V - 4V, the part of the signal that becomes dirty is way beyond the point where the FET switches "ON", so that should not be a problem. So, my (probably) premature conclusion is: the FET I ordered should work fine. It's capacity does not have any effect on the rise-and-fall times, it's own turn-on time is way smaller than the applied pulse, and the ON-resistance is lower, so dissipation should be lower. But, we all know Mr. Murphy (only few people know he actually was an optimist) so -as always- the proof of the pudding will be in the eating.... I took some pictures of the signals and I put them in the album again: /g/TekScopes/album?id=64919&p=pcreated,,,20,1,0,0 To be continued, Un saludo, Leo
|
When Posting Photos Please include the following...
Just a reminder:
If you announce to TekScopes members that you posted photo(s) to a TekScopes
photo album please include a link to their exact location, the title of the
photo album, and if it was created some time prior to your post date, the
creation date of the album.
If you take a moment to these three things in your announcement it will save
everyone interested in looking at your photos the time it takes to hunt
through the photo albums.
Yes, I know you can order the albums by date created or by title. Don't
assume your photo album will be looked at immediately in which case it can
be quickly found by creation date. Consider the case where someone reads
your post years later and wants to see the photos.
Dennis Tillman W7PF
--
Dennis Tillman W7PF
TekScopes Moderator
|
Re: Replacing Electrolytics in a 465/465B
Hi Victor,
I'm asking $8 each (shipping included) for one board for U.S. destinations. Since shipping would be calculated separately for overseas, the boards would be $5 each. Do you have a shipping carrier preference? Looking at USPS, the prices are rather high to France but I ma be looking at the wrong options.
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "Victor via Groups.Io" <vmcfer@...>
To: [email protected]
Sent: Thursday, July 26, 2018 2:52:17 AM
Subject: Re: [TekScopes] Replacing Electrolytics in a 465/465B
Hello Barry,
Nice job and clean solution congrats. I have 2 x 465B and one 465 that need
to be recap soon. I would love to get 3 boards. What is the price for them.
Also I live in France did you accept international shipping? Also the
related cost.
Please let me know.
Have a nice day.
Victor
-----Original Message-----
From: n4buq <n4buq@...>
To: TekScopes <[email protected]>
Sent: Wed, Jul 25, 2018 1:05 am
Subject: [TekScopes] Replacing Electrolytics in a 465/465B
Recently, I had a problem with the LV supplies in my 465B. Thinking it was a
shorted electrolytic can, I decided to replace all of them (although it
turned out to be a shorted tantalum but had already pulled the cans before
finding the real problem).
I decided to design a small PC board on which to mount modern snap-in caps.
THe board mounts with standoffs in the exising larger holes that are left
when the cans are removed and allow replacement of the snap-ins if/when they
fail and that can be done without further soldering on the original board.
Pictures of the board and the process are in the following album:
/g/TekScopes/album?id=64929
If anyone is interested, I have extra boards for sale.
Thanks,
Barry - N4BUQ
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Re: All TekScopes email sent to Spam
Hi Chuck,
A common misconception is that an email Sender whose IP address is listed on a DNSBL (Domain Name System-based Blackhole List) is 'blocked' from sending out email. In fact Senders are in no way prevented by DNSBLs from sending email. The Spamhaus DNSBLs are used only by RECEIVING mail systems on private networks and are used voluntarily.
Spamhaus does not tell a 3rd-party mail system what to do with an item of email, the 3rd-party mail system asks Spamhaus for an opinion and Spamhaus responds to that request with its opinion. In effect the receiving mail server asks the Spamhaus DNSBL "Does this Sender's IP Address exist on the Spamhaus database?", the Spamhaus DNSBL simply responds with a "Yes" if present or, if not present does not respond at all (no response means "we have no opinion on that IP Address").
Dennis Tillman W7PF
toggle quoted message
Show quoted text
-----Original Message-----
From: Chuck Harris
Sent: Thursday, July 26, 2018 5:33 AM <snip>
A long while ago, I engaged in an email conversation with a group member
that did not like what I had to say, and rather than talk to me about
it, he reported my email address to the misguided SJW folks at spamhaus.
From that point on, my email was rejected by every ISP that used their
lists of "known" spammers to "protect" their customers. Verizon FIOS
accounts were, at that time, using yahoo as their email system, and they
were one of the ISPs that were using the spamhaus lists.
-- Dennis Tillman W7PF TekScopes Moderator
|
Re: All TekScopes email sent to Spam
A long while ago, I engaged in an email conversation with
a group member that did not like what I had to say, and rather
than talk to me about it, he reported my email address to
the misguided SJW folks at spamhaus. From that point on,
my email was rejected by every ISP that used their lists of
"known" spammers to "protect" their customers. Verizon FIOS
accounts were, at that time, using yahoo as their email system,
and they were one of the ISPs that were using the spamhaus lists.
Verizon has subsequently dropped yahoo to avoid an antitrust
violation punishment.
To get off of the list would have required me to send spamhaus
all of my private information, which I thought was an excessive
requirement under the circumstances, so I let it be. I had other
email accounts.
When you use yahoo's email services, you are given the option
during setup of deciding whether you want your spam protection
to be none, moderate, or full. It defaults to full. You can
change that setting at any time by logging into your yahoo account
and adjusting your preferences.
Given that groups.io has siphoned off great quantities of yahoo's
groups, it would not surprise me at all to find out that yahoo has
retaliated by banning groups.io to the spam lists.
-Chuck Harris
machineguy59 via Groups.Io wrote:
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I thought our group was using "groups.io" not Yahoo. Yahoo should not be involved unless they are your email client. I use Yahoo email client and web based email. That Yahoo client dumped all of my messages to SPAM one day last week. But I marked them as "Not Spam" and everything has be good since then.
On ?Wednesday?, ?July? ?25?, ?2018? ?03?:?18?:?04? ?PM? ?CDT, John Griessen <john@...> wrote:
On 07/25/2018 02:36 PM, Harvey White wrote:
It's possible
that the classification of the yahoo email has changed somehow,
causing your email program to put it elsewhere. Right. various yahoo.com servers may have been downgraded in their trustworthiness
and then the settings of your junk sensing flag it as junk. If you change settings to
allow from yahoo it will probably come through. That's called whitelisting.
No problem here using thunderbird email reader.
I also run my own mail server and it is not using the real time blacklisting
rankings of yahoo to reject mail from yahoo. Yahoo is still deemed trustworthy by them
as far as I can tell.
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Michael A. Terrell
satbeginner