Re: in-circuit capacitor testing (ESR tester) -- ideas appreciated.
This one works well in circuit and is easy to build.
Bama Manual Archive (edebris.com)
<>
It doesn't have the greatest resolution for very low ESR caps, but for
good/bad it's always been reliable.
ST
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On Wed, Jul 21, 2021 at 3:35 PM Ronan <bass.woofer@...> wrote: Hello again,
My main thread is " 2712 SA with display (and normalization) issues".
Due to the large number of electrolytic caps this SA has, I wonder if
anyone can recommend a (not too costly) in-circuit ESR capacitor tester I
could use to narrow down problem caps that otherwise show no obvious signs
of failure (i.e. leaking, exploded).
I've seen the tweezer-type LRC testers, and they might work for in-circuit
SMD capacitor testing, however, thought I'd run this by everyone first,
since I have no experience with such in-circuit cap testing/testers.
Creating a new Topic, since this is a generic question.
Thanks in advance,
Ronan
|
Re: in-circuit capacitor testing (ESR tester) -- ideas appreciated.
On 2021-07-22, at 14:28, Richard Peterson <saaber1@...> wrote:
I use an IET DE-5000 LCR meter.
Recommend. Another good, but even cheaper addition: Mastech MS8911. (Don¡¯t fall for the MS8910, which is not very useful.) The MS8911 has a 0.1 V mode which can be used to avoid switching on semiconductor junctions. It also uses up very little space in the instrument drawer :-) Gr¨¹?e, Carsten
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Re: Replace/Repair TM 500 Module Side Panel Latch
Hello Siggi,
I notice the price for your parts is quite inexpensive. Is that price set by Shapeways? I ask because I have a small 3D printing job that I would like to have printed and wondering how much it would cost to have that done by Shapeways. Please feel free to contact me off-list if you prefer.
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "Siggi via groups.io" <siggi@...>
To: [email protected]
Sent: Thursday, July 22, 2021 5:58:50 AM
Subject: Re: [TekScopes] Replace/Repair TM 500 Module Side Panel Latch
I modeled these up and put them on Shapeways, and I understand some people
have had success with those. You can buy prints, or you can download the
models and print them yourself.
Here are the links, in case anyone else needs some:
I don't take a markup on those, and the models are free to use as you like:
.
Siggi
?ann fim., 22. j¨²l. 2021 kl. 06:06 skrifa?i EJP <esmond.pitt@...>:
On Wed, Jul 21, 2021 at 07:59 AM, Jeff Dutky wrote:
Before we start trying to manufacture a replacement (which I think is a fine
idea, especially in this new age of 3D printing) There are existing 3D models for these. I'm not sure where I got mine,
probably Thingiverse or Tinkercad, but I've printed a bucn of them and they
work. I'm happy to supply either the models via email or 3D prints at
cost-plus.
EJP
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Re: in-circuit capacitor testing (ESR tester) -- ideas appreciated.
I use an IET DE-5000 LCR meter. Mine has both tweezers and Kelvin clips (i installed these to replace the alligator clips that came with it). It will test ESR at 100kHz and capcitance at 100/120/1k Hz as needed - it also has a 10kHz frequency available. Of course it can do many other things as well so it's much more than an ESR tester . . . i use it regularly, so well worth the $100 i spent on it.
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Re: Replace/Repair TM 500 Module Side Panel Latch
Shapeways shipping to UK has got stupid expensive lately. I need to find a UK based 3D printer that will SLA print in nylon.
PS If I do find someone, will you make the models available for DL?
Thanks
David
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Siggi via groups.io Sent: 22 July 2021 11:59 To: [email protected]Subject: Re: [TekScopes] Replace/Repair TM 500 Module Side Panel Latch I modeled these up and put them on Shapeways, and I understand some people have had success with those. You can buy prints, or you can download the models and print them yourself. Here are the links, in case anyone else needs some: I don't take a markup on those, and the models are free to use as you like: . Siggi
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Re: Replace/Repair TM 500 Module Side Panel Latch
I modeled these up and put them on Shapeways, and I understand some people
have had success with those. You can buy prints, or you can download the
models and print them yourself.
Here are the links, in case anyone else needs some:
I don't take a markup on those, and the models are free to use as you like:
.
Siggi
?ann fim., 22. j¨²l. 2021 kl. 06:06 skrifa?i EJP <esmond.pitt@...>:
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On Wed, Jul 21, 2021 at 07:59 AM, Jeff Dutky wrote:
Before we start trying to manufacture a replacement (which I think is a fine
idea, especially in this new age of 3D printing) There are existing 3D models for these. I'm not sure where I got mine,
probably Thingiverse or Tinkercad, but I've printed a bucn of them and they
work. I'm happy to supply either the models via email or 3D prints at
cost-plus.
EJP
|
Re: Replace/Repair TM 500 Module Side Panel Latch
On Wed, Jul 21, 2021 at 07:59 AM, Jeff Dutky wrote: Before we start trying to manufacture a replacement (which I think is a fine
idea, especially in this new age of 3D printing) There are existing 3D models for these. I'm not sure where I got mine, probably Thingiverse or Tinkercad, but I've printed a bucn of them and they work. I'm happy to supply either the models via email or 3D prints at cost-plus. EJP
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Re: Looking for data on 9-pin Vacuum time delay relays used in old Tek-scopes
I looked tonight at Nebraska Sales & Surplus. They have them. the 555 driving a relay looks more and more attractive.
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Re: in-circuit capacitor testing (ESR tester) -- ideas appreciated.
I did this review of 3 easily available units. It is still valid today.
Buyer beware of the El Cheapo Chinese units on Xbay. Many disappointing reviews.
Menahem
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Re: AA 501A Parts, DM 501A Probes
They seem pretty unique¡two of the 1/4-turn latches along the top¡an insulation layer on the inside¡none of the dozen or so different modules I have here have the same type of side panel. Sphere had the exact part, just no latches, but I think I¡¯ve been able to remove ones from other side panels to retrofit. This was my first dealing with Sphere. Susan and Walter were very helpful and the prices were very reasonable.
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Re: Binding Post Thumb/Head Nut Replacements
I have added another picture to the album ( /g/TekScopes/album?id=266234) showing all six candidates I have tried for replacing missing thumb nuts on 500-series scopes and plug-ins. The picture shows seven nuts, labeled A-G. The nuts are: A: An original Tek thumb nut, full height, as would be used on a 500-series scope, plug-in, or binding post adapter for a 465 or 475. B: "316 Stainless Steel Knurled Thumb Nut 1/4-28 Thread" from eBay ( C: "M5 Precision Knurled Thumb Nut" from eBay () D: "M5 Steel Leveling Knurled Thumb Nut" from eBay () E: "OEM by Bosch 50534 1/4-28 Knurled Steel Nuts" from eBay () F: "1/4-28 Internal Wrenching Allen Nut Alloy Steel Black" from eBay () G: "1/4-28x7.5mm(L)x10mm(OD) Metric Threaded Brass Knurl Round Insert Nuts" from eBay () My evaluations are: (A) are, of course, practically perfect in all particulars. I'm still surprised and saddened that I can't find a source for them. Were these custom made for or by Tek? (B) has very pleasant diamond knurling, at least as fine as what Tek used, but is about 1.5X the outer diameter and about 3X as tall. It is only threaded half way through on the flat end, which makes it hard to use the female banana jack with this nut in place. While it is larger in diameter than the Tek part, it looks like it will still leave enough clearance on something like a CA or D plug-in to use the UHF or BNC connectors, but it may be too large for use on some TM500, 5000-series, or 7000-series plug-ins. (C) is the wrong thread, closed at one end, and too short, so it will not properly clamp a wire inserted through the binding post. The knurling is very nice. It's a shame that these are otherwise unsuitable. (D) is the wrong thread, and the outer diameter is much too large for even the relatively roomy 500-series plug-ins. The nut is also about 1.5X the height of the Tek part. The knurling is coarser than the Tek part, and is not diamond knurling, but I think it's still pleasant. They are entirely unsuitable to the task. (E) is the same outer diameter as (B) but only slightly taller than the Tek nut. The knurling is much coarser than either (B) or the Tek part. Like (B) this seems to leave enough room for the probe inputs on 500-series plug-ins, but may be too large for some TM500, 5000-series, or 7000-series plug-ins. (F) is almost perfect; only slightly taller than the Tek part, it does not interfere with the use of banana plugs, and looks very nice on a scope or plug-in. The knurling, while not diamond, is very fine and pleasing. I liked these so much that I ordered several more bags of them in case of future need. (G) is slightly shorter than the Tek part, which means that it leaves a little bit of the threaded shaft/banana jack cylinder exposed to damage. The brass doesn't look nearly as odd on a scope or plug-in as I feared it would, and even though the knurling is very coarse, it still feels nice on the fingers. These have the singular advantage of being very inexpensive (I got 15 pieces for under $9, and could probably have paid even less if I were willing to buy larger quantities). (F) and (G) are my favorites, but (B) and (E) would do in a pinch. -- Jeff Dutky
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Re: Looking for data on 9-pin Vacuum time delay relays used in old Tek-scopes
right. I was thinking about a 555 timer chip driving a relay.
places like surplus sales of nebraska, or perhaps sphere might have the originals.
--rick chinn
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Re: AA 501A Parts, DM 501A Probes
will the side panels from other tm5xx instruments fit the AA501?
--rick
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Re: Recreating an old board for the 7854
Hi George,
Yes, I will admit that is my bench. In terms of the 465 videos. The vertical section will post on Friday. And I hope to be recording the Horizontal and time base this weekend. That should finish up a full calibration on a 465B. I also have the SG503 video in the works and plans to touch up the TG501 and the PG506 as well. Here is the link to the main channel page.
So, yep that is me.
Zen
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Glydeck via groups.io Sent: Wednesday, July 21, 2021 12:24 PM To: [email protected]Subject: Re: [TekScopes] Recreating an old board for the 7854 Zen, Is this your YouTube channel? The videos are great! I¡¯ll be watching the 465 video later today. BTW, I¡¯ve been using Svg2Shenzhen in conjunction with Inkscape to create custom kicad footprints. George KD6NEW On Jul 21, 2021, at 7:27 AM, Zentronics42@... wrote:
?That was a miss label. Q500 and Q510 are the same part number it is 2 discrete transistors. I have it updated.
Zen
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Vince
Vielhaber
Sent: Tuesday, July 20, 2021 9:47 PM
To: [email protected]
Subject: Re: [TekScopes] Recreating an old board for the 7854
Which one is Q510? I see 2 Q500s but no Q510. Of course it could just
be me.
Vince.
On 07/20/2021 08:48 PM, Zentronics42@... wrote:
I have uploaded the schematic that I have drawn up in Kicad in the files section. Given the new information for Q500 and Q510 I think I will need a different part in CR511. I need to figure out how to make Kicad do a PCB edge connecter. But here is the work so far. Since I am still in the schematic phases and have not started laying down foot prints I need to decide thru hole or SMD construction. The transistors will be SOT-23 so they are SMD.
Zen
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of GeorgeP
Sent: Tuesday, July 20, 2021 6:05 PM
To: [email protected]
Subject: Re: [TekScopes] Recreating an old board for the 7854
On Tue, Jul 20, 2021 at 01:13 PM, <Zentronics42@...> wrote:
When the design is checked and tested If there is any interest in
these let me know. Not sure how many out there want to tackle a full cal of a 7854.
I am interested. Thanks!
--
Michigan VHF Corporation -- nobucks dot net
K8ZW -
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Re: Recreating an old board for the 7854
Zen,
Is this your YouTube channel?
The videos are great! I¡¯ll be watching the 465 video later today.
BTW, I¡¯ve been using Svg2Shenzhen in conjunction with Inkscape to create custom kicad footprints.
George KD6NEW
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On Jul 21, 2021, at 7:27 AM, Zentronics42@... wrote:
?That was a miss label. Q500 and Q510 are the same part number it is 2 discrete transistors. I have it updated.
Zen
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Vince Vielhaber
Sent: Tuesday, July 20, 2021 9:47 PM
To: [email protected]
Subject: Re: [TekScopes] Recreating an old board for the 7854
Which one is Q510? I see 2 Q500s but no Q510. Of course it could just
be me.
Vince.
On 07/20/2021 08:48 PM, Zentronics42@... wrote:
I have uploaded the schematic that I have drawn up in Kicad in the files section. Given the new information for Q500 and Q510 I think I will need a different part in CR511. I need to figure out how to make Kicad do a PCB edge connecter. But here is the work so far. Since I am still in the schematic phases and have not started laying down foot prints I need to decide thru hole or SMD construction. The transistors will be SOT-23 so they are SMD.
Zen
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of GeorgeP
Sent: Tuesday, July 20, 2021 6:05 PM
To: [email protected]
Subject: Re: [TekScopes] Recreating an old board for the 7854
On Tue, Jul 20, 2021 at 01:13 PM, <Zentronics42@...> wrote:
When the design is checked and tested If there is any interest in
these let me know. Not sure how many out there want to tackle a full cal of a 7854.
I am interested. Thanks!
--
Michigan VHF Corporation -- nobucks dot net
K8ZW -
|
Re: Recreating an old board for the 7854
That was a miss label. Q500 and Q510 are the same part number it is 2 discrete transistors. I have it updated.
Zen
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Vince Vielhaber Sent: Tuesday, July 20, 2021 9:47 PM To: [email protected]Subject: Re: [TekScopes] Recreating an old board for the 7854 Which one is Q510? I see 2 Q500s but no Q510. Of course it could just be me. Vince. On 07/20/2021 08:48 PM, Zentronics42@... wrote: I have uploaded the schematic that I have drawn up in Kicad in the files section. Given the new information for Q500 and Q510 I think I will need a different part in CR511. I need to figure out how to make Kicad do a PCB edge connecter. But here is the work so far. Since I am still in the schematic phases and have not started laying down foot prints I need to decide thru hole or SMD construction. The transistors will be SOT-23 so they are SMD.
Zen
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of GeorgeP
Sent: Tuesday, July 20, 2021 6:05 PM
To: [email protected]
Subject: Re: [TekScopes] Recreating an old board for the 7854
On Tue, Jul 20, 2021 at 01:13 PM, <Zentronics42@...> wrote:
When the design is checked and tested If there is any interest in
these let me know. Not sure how many out there want to tackle a full cal of a 7854.
I am interested. Thanks!
-- Michigan VHF Corporation -- nobucks dot net K8ZW -
|
Re: in-circuit capacitor testing (ESR tester) -- ideas appreciated.
I use an Extech LCR200 for in-circuit testing. It computes the overall
impedance at your specified frequency. Just make sure you COMPLETELY
discharge the capacitors using a 25K high wattage power resistor. It can
take several seconds to remove the residual charge from the capacitor's
deep recesses.
Gary
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On Wed, Jul 21, 2021 at 6:35 AM Ronan <bass.woofer@...> wrote: Hello again,
My main thread is " 2712 SA with display (and normalization) issues".
Due to the large number of electrolytic caps this SA has, I wonder if
anyone can recommend a (not too costly) in-circuit ESR capacitor tester I
could use to narrow down problem caps that otherwise show no obvious signs
of failure (i.e. leaking, exploded).
I've seen the tweezer-type LRC testers, and they might work for in-circuit
SMD capacitor testing, however, thought I'd run this by everyone first,
since I have no experience with such in-circuit cap testing/testers.
Creating a new Topic, since this is a generic question.
Thanks in advance,
Ronan
--
Gary Robert Bosworth
grbosworth@...
Tel: 310-317-2247
|
Re: in-circuit capacitor testing (ESR tester) -- ideas appreciated.
Everything you ever wanted to know about ESR and various designs:
I built one of those designs and it was very helpful. There's also an ESR adapter for your dmm on the eevblog. That one is also on that site
There's a link on that page to the original discussion.
These things are so easy to build it's almost not worth buying something. And for testing, having 0.01 ohm resolution is worthless.
Paul
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On Wed, Jul 21, 2021 at 06:35:44AM -0700, Ronan wrote: Hello again,
My main thread is " 2712 SA with display (and normalization) issues".
Due to the large number of electrolytic caps this SA has, I wonder if anyone can recommend a (not too costly) in-circuit ESR capacitor tester I could use to narrow down problem caps that otherwise show no obvious signs of failure (i.e. leaking, exploded).
I've seen the tweezer-type LRC testers, and they might work for in-circuit SMD capacitor testing, however, thought I'd run this by everyone first, since I have no experience with such in-circuit cap testing/testers.
Creating a new Topic, since this is a generic question.
Thanks in advance,
Ronan
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows
|
in-circuit capacitor testing (ESR tester) -- ideas appreciated.
Hello again,
My main thread is " 2712 SA with display (and normalization) issues".
Due to the large number of electrolytic caps this SA has, I wonder if anyone can recommend a (not too costly) in-circuit ESR capacitor tester I could use to narrow down problem caps that otherwise show no obvious signs of failure (i.e. leaking, exploded).
I've seen the tweezer-type LRC testers, and they might work for in-circuit SMD capacitor testing, however, thought I'd run this by everyone first, since I have no experience with such in-circuit cap testing/testers.
Creating a new Topic, since this is a generic question.
Thanks in advance,
Ronan
|
Re: 2712 SA with display (and normalization) issues
#photo-notice
|
Richard Peterson
David C. Partridge
Glydeck
Gary Robert Bosworth