Re: WTB 012-0648-00 6 pin LEMO M-M 30" cable for Tracking Generator
Hi Is 1s, 12mm, not 2s, 14,8mm Regards Miguel -----Mensaje original----- De: [email protected] [mailto: [email protected]] En nombre de Miguel Work Enviado el: jueves, 14 de marzo de 2019 19:52 Para: [email protected]Asunto: Re: [TekScopes] WTB 012-0648-00 6 pin LEMO M-M 30" cable for Tracking Generator is this? -----Mensaje original----- De: [email protected] [mailto: [email protected]] En nombre de Dennis Tillman W7PF Enviado el: jueves, 14 de marzo de 2019 2:24 Para: [email protected]Asunto: [TekScopes] WTB 012-0648-00 6 pin LEMO M-M 30" cable for Tracking Generator I got my TR502 Tracking Generator, DC508 Option 7, and TM503 Option 7 all set up and I then discovered I need the 6 pin LEMO cable (3 male pins and 3 female pins) that goes from the Spectrum Analyzer to the TR502 Tracking Generator Logic . The part number is 012-0648-00. If anyone has one for sale please contact me OFF LIST at dennis at ridesoft dot com. Thank you, Dennis Tillman W7PF
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Re: WTB 012-0648-00 6 pin LEMO M-M 30" cable for Tracking Generator
is this? -----Mensaje original----- De: [email protected] [mailto: [email protected]] En nombre de Dennis Tillman W7PF Enviado el: jueves, 14 de marzo de 2019 2:24 Para: [email protected]Asunto: [TekScopes] WTB 012-0648-00 6 pin LEMO M-M 30" cable for Tracking Generator I got my TR502 Tracking Generator, DC508 Option 7, and TM503 Option 7 all set up and I then discovered I need the 6 pin LEMO cable (3 male pins and 3 female pins) that goes from the Spectrum Analyzer to the TR502 Tracking Generator Logic . The part number is 012-0648-00. If anyone has one for sale please contact me OFF LIST at dennis at ridesoft dot com. Thank you, Dennis Tillman W7PF
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Re: Test input for an SD-32 sampling head
LOL With *great* difficulty. That's a large part of the appeal of the project. It's not very expensive and if I succeed serious bragging rights. It would be great fun to take to a Keysight trade show booth and put on their new 110 GHz DSO to check it.
I'll have to give an algebraic solution some thought. That had not occurred to me. I can't justify buying 3 fast heads. Just one is a real stretch to justify. But there may be a useful mathematical subterfuge.
Courtesy of a member of the EEVblog forum who was kind enough to give me the magic phrase, I found Michael Case's 1993 doctoral dissertation at UC Santa Barbara on "non-linear transmission line pulse generators". Very interesting approach. It uses the dispersion produced by reverse biased diodes at appropriate intervals to steepen the leading edge. I've only given it a quick glance. For reading I'll want a paper copy. But starting with a 21 pS edge from the laser diode driver Leo Bodnar is using i might not be too difficult. I'll have to work on the math a bit.
Have Fun!
Reg
I'm hoping that someone involved with the SD-30/32 heads will wander along and tell us how they did it at the factory.
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Re: 2247A PSU Troubleshooting
I have a Danica SV03 which is an isolated 3A variable source with V & A meters, but when you look inside it is simply a standard variable transformer with a separate isolation transformer so wouldn't be difficult to reproduce something like it.
Adrian
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On 3/14/2019 5:15 PM, David C. Partridge wrote: All variacs that I know of are auto-tranformers, so no isolation.
David
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of John Williams
Sent: 14 March 2019 16:23
To: [email protected]
Subject: Re: [TekScopes] 2247A PSU Troubleshooting
Interesting information Brian. I have often wondered if a Variac would provide isolation also. I have never checked mine I probably should. Regards John
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Re: 2247A PSU Troubleshooting
There are variacs with an isolation transformer built in. But very rare. I own one made by Philips a dutch company.
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On 14 mrt. 2019, at 18:15, David C. Partridge <david.partridge@...> wrote:
All variacs that I know of are auto-tranformers, so no isolation.
David
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of John Williams
Sent: 14 March 2019 16:23
To: [email protected]
Subject: Re: [TekScopes] 2247A PSU Troubleshooting
Interesting information Brian. I have often wondered if a Variac would provide isolation also. I have never checked mine I probably should. Regards John
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Re: 2247A PSU Troubleshooting
All variacs that I know of are auto-tranformers, so no isolation.
David
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of John Williams Sent: 14 March 2019 16:23 To: [email protected]Subject: Re: [TekScopes] 2247A PSU Troubleshooting Interesting information Brian. I have often wondered if a Variac would provide isolation also. I have never checked mine I probably should. Regards John
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Re: 2247A PSU Troubleshooting
On Thu, Mar 14, 2019 at 05:03 PM, Brian Symons wrote:
I was only answering to the comment about isolation transformers.
Hi Brian, I found your post very informative but wanted to keep things as simple and clear as possible for the OP. I had recommended a Variac and he wasn't sure what to do. In his case he can either connect safety earth or not. Raymond
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Re: 2247A PSU Troubleshooting
On Thu, 14 Mar 2019 09:22:35 -0700, you wrote: Interesting information Brian. I have often wondered if a Variac would provide isolation also. I have never checked mine I probably should. Regards John Variacs are tapped autotransformers. No isolation. You can get an assembly that combines a variac with an isolation transformer. Some companies make a device specifically for checking leakage and isolation, though. Harvey
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Re: 2247A PSU Troubleshooting
On Thu, Mar 14, 2019 at 05:22 PM, John Williams wrote:
I have often wondered if a Variac would provide isolation also.
In general, no. A Variac is just a primary with an adjustable tap. Variacs with isolation exist, having their adjustable tap on a secondary winding. Raymond
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Re: 577 Curve tracer ringing CRT and noisy step generator
/g/TekScopes/album?id=86536&p=Name,,,20,1,0,0 Updates to the photo gallery, probing the base of the 177 test fixtures reveals small parasitic spikes, I believe this is what is causing the garbled trace I am experiencing, now to trace where that is coming from
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Re: 2247A PSU Troubleshooting
Interesting information Brian. I have often wondered if a Variac would provide isolation also. I have never checked mine I probably should. Regards John
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Re: 2247A PSU Troubleshooting
I was only answering to the comment about isolation transformers.
If any user gets one then I hope they can check them out to be sure that they are safe instead of expecting it to work & getting bitten.
Having purchased one that was dangerous - a 'lecky had obviously "fixed it to make it safe" which could have killed a user & finding two on test benches that were also dangerous, I just wished to make a purchaser or user aware of possible dangers that may not have been apparent.
I used to do quite a bit of "test & tag" & I found a hell of a lot of dangerous gear even on techs benches.
One of the jobs had several isolation transformers with the through earth of various sizes used for mains filtration so that's how I learned about them.
I saw one of them listed a while ago on eBay as a "test equipment" which it obviously isn't & other users may not have been aware of isolation transformers that aren't designed for the service industry..
Regards,
Brian.
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On 14-Mar.-19 22:57, Raymond Domp Frank wrote: On Thu, Mar 14, 2019 at 05:18 AM, Brian Symons wrote:
*Re: Isolation Transformers*
When using an isolation transformer for troubleshooting you do not want an
earth being connected through.
The whole idea is to break any reference between earth & the mains.
The winding will make both outputs fully isolated from earth so that you can
measure them safely.
This is one time that earth is your enemy.
Brian,
Let's not confuse the OP.
He has a 'scope with a HV (mains switching power supply) part that is galvanically connected to the mains and a LV part that is under normal conditions separated from the HV part through an internal "HF" transformer (inverter output).
Safety earth is normally connected to the 'scope's chassis, not the HV part.
The OP wants to do tests in the rather complicated HV part.
By earthing the chassis and the LV part, the HV part stays isolated.
For all intents and purposes, the LV part is a second isolated part (internal transformer) and there's no reason to float the chassis.
Raymond
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Re: Test input for an SD-32 sampling head
And if you do get a 2ps rise pulse generator how do you check that that is up to its spec?
Roger
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Re: Tektronix 015-0580-00 Pocket Signal Generator
Thank you for the additional information. I was curious if it would be of any interesting use when I came across it by chance on ebay. I do not own any TDS series scope and upon better understanding its designed purpose I see now that it is not something I will pursue. Thanks again.
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Re: 2247A PSU Troubleshooting
On Thu, Mar 14, 2019 at 05:18 AM, Brian Symons wrote:
*Re: Isolation Transformers*
When using an isolation transformer for troubleshooting you do not want an
earth being connected through.
The whole idea is to break any reference between earth & the mains.
The winding will make both outputs fully isolated from earth so that you can
measure them safely.
This is one time that earth is your enemy.
Brian, Let's not confuse the OP. He has a 'scope with a HV (mains switching power supply) part that is galvanically connected to the mains and a LV part that is under normal conditions separated from the HV part through an internal "HF" transformer (inverter output). Safety earth is normally connected to the 'scope's chassis, not the HV part. The OP wants to do tests in the rather complicated HV part. By earthing the chassis and the LV part, the HV part stays isolated. For all intents and purposes, the LV part is a second isolated part (internal transformer) and there's no reason to float the chassis. Raymond
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Re: Test input for an SD-32 sampling head
On Wed, Mar 13, 2019 at 05:22 PM, Reginald Beardsley wrote: How do you test these? The 7 pS rise time is a pretty difficult spec if you
want a 10x margin. With difficulty. I believe there's a method involving three sampling heads looking at each other's kickout pulses and some maths which can be used to evaluate their performance. The SD-24's pulse generator has a risetime of about 16-17ps, I think, but any faster than that is tricky. The calibrator output on the 11802 (but not the 11801 or 11803/CSA803) has a similarly fast rise time, being made of the same hybrid module. Chris
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Re: Not to be missed by 7854 fans...
John,
Great find! Thanks for sharing. I¡¯m looking forward to seeing this!
A hoard of never-developed film from the Apollo 11 mission was unearthed, some of it in 70mm. The filmmakers also made use of a bounty of audio material whose existence was previously known but which had never before been synced to pictures.
George
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On Mar 13, 2019, at 10:30 PM, John Miles <john@...> wrote:
Tek content begins around 8:58. Specifically, this is part 7 of
CuriousMarc's series on restoring an Apollo Guidance Computer, but the whole
video (and whole series) is great. You really feel like you're right there
with Marc, Ken, and Mike, trying to bring a real-life HAL back to life:
Now where'd I put that spare AE-35 unit...?
-- john, KE5FX
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Not to be missed by 7854 fans...
Tek content begins around 8:58. Specifically, this is part 7 of
CuriousMarc's series on restoring an Apollo Guidance Computer, but the whole
video (and whole series) is great. You really feel like you're right there
with Marc, Ken, and Mike, trying to bring a real-life HAL back to life:
Now where'd I put that spare AE-35 unit...?
-- john, KE5FX
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Re: Looking for Sony-Tektronix 318 Logic Analyser Operator's Guide
On Wed, 13 Mar 2019 13:58:49 -0700, you wrote: On Tue, Mar 12, 2019 at 01:00 PM, Raymond Domp Frank wrote:
wading through an operator manual saves time in getting acquainted
Well, upon seeing the Operator's manual (Thanks for posting it to Tekwiki!)¡ I can see that manual has examples of how to set up the 318, that the Army service manual doesn't give. But I guess, and this is the just of my question, I think... I just didn't recon anyone was using them, to do logic analysis, or for servicing stuff anymore (the p.c. based L.A.s are so cheap and powerful)... so I was thinking, I'm missing some use for these old LAs...(other than for technical/design/parts interest... which the service guide covers much better). Debugging I2C data streams, FPGA outputs, video data outputs from graphics chips. Have a CPLD standalone board that takes apart I2C communications and drives an HP logic analyzer. Goes from time to state and tags the message bytes in the signal. Made a while back before cheap PC based logic analyzers. One blade in my logic analyzer does 64 channels, and there are times when I've used most of them, typically 32 to monitor I2C state and 8 to 16 to monitor the results from something that got the I2C message. Harvey I understand what you are saying... but, most of the older L.A.s, I run across, are being used to weigh down the basement floor. If people are doing something useful with them, I'd like to do it too.
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Re: Looking for Sony-Tektronix 318 Logic Analyser Operator's Guide
On Wed, 13 Mar 2019 13:38:43 -0700, you wrote: On Tue, Mar 12, 2019 at 11:49 AM, Harvey White wrote:
if you regard signature analysis as fun, then you can do that.
Hi Harvey:
Thanks for the reply. There's always a few old L.A.s keeping the concrete slab down, in someone's basement... and I'm thinking about that, whenever I see one. Logic analyzers are very useful, but somewhat limited in what they do. They really were needed in the times of 8 and 16 bit microprocessors, and are less useful for microcontrollers. However, since most microcontrollers have built in debugging, you don't need to monitor the instructions and data paths. Monitoring the program at an assembly language level isn't as useful as it might be when you are dealing with a compiled program. Sometimes, however, you need to check to see what the compiler does. The 308 has a word recognition module, and the 318/338 have word recognition modes... but, if its signature analysis... aren't captured word(s), further processed, to generate the signature? Can you do that with a 308/318/338? Lots of logic analyzers are multiple byte wide memories with inputs for each bit. Clocking data is either a timebase or an external clock, so you get either a time mode/waveform display or a state mode where only data happening at the clock is captured. Signature mode takes a start, stop and then looks at the transitions at a node. Those transistions are run through a shift register with feedback, and the result is displayed in odd alphanumerics. Not the same thing, and the data is not stored then processed in signature mode. 308 does signature, and is a limited logic analyzer. Don't have the other ones. Tektronix logic analyzers and HP scopes generally drive me up a wall, so I have tektronix scopes and HP logic analyzers. Harvey
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Fred Schumacher
David C. Partridge
Raymond Domp Frank
John Williams
Glydeck