Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- TekScopes
- Messages
Search
|
Re: Bias batteries in 7S14
Dennis Tillman
I have two of these units. One has a bad battery
toggle quoted message
Show quoted text
but the other one is still working fine after 25 years! Dennis -----Original Message-----
From: vollumscope [mailto:perls@...] Sent: Thursday, March 04, 2004 10:39 AM To: TekScopes@... Subject: [TekScopes] Bias batteries in 7S14 Howdy all- With all the talk of TEK samplers and the mention of the 7S14, I wonder what are we 7S14 owners to do these days when it comes to replacing the bias batteries in the 7S14? I gather that the merc oxide batteries originally spec'ed are no longer available. Is the 1.35V merc oxide batt voltage that strict a spec in the 7S14? Thoughts? -Vollumscope Yahoo! Groups Links |
|
Re: Coax for Calibration Instruments
Stan & Patricia Griffiths
Hi Bill,
toggle quoted message
Show quoted text
I generally use just about any random piece of RG58 that is 2-6 feet long for these applications. It really does not seem to make a lot of difference. It will make more difference when you calibrate scopes above 100 MHz bandwidth. Stan w7ni@... ----- Original Message -----
From: "Bill Smith" <ko4nrbs@...> To: "Tektronix Group" <TekScopes@...> Sent: Thursday, March 04, 2004 6:11 AM Subject: [TekScopes] Coax for Calibration Instruments The manual for the Tektronix 453 oscilloscope calls |
|
Re: Bias batteries in 7S14
Michael Dunn
Does anyone have a digitized manual...?
toggle quoted message
Show quoted text
At 12:45 PM -0600 2004/3/4, Scott Newell wrote:
At 12:39 PM 3/4/2004 , vollumscope wrote:With all the talk of TEK samplers and the mention of the 7S14, IFunny, I was going to ask if there were any symptoms of weak cells. |
|
Re: Bias batteries in 7S14
Scott Newell
At 12:39 PM 3/4/2004 , vollumscope wrote:
With all the talk of TEK samplers and the mention of the 7S14, IFunny, I was going to ask if there were any symptoms of weak cells. Anything to watch out for? newell |
|
Bias batteries in 7S14
Howdy all-
With all the talk of TEK samplers and the mention of the 7S14, I wonder what are we 7S14 owners to do these days when it comes to replacing the bias batteries in the 7S14? I gather that the merc oxide batteries originally spec'ed are no longer available. Is the 1.35V merc oxide batt voltage that strict a spec in the 7S14? Thoughts? -Vollumscope |
|
Coax for Calibration Instruments
Bill Smith
The manual for the Tektronix 453 oscilloscope calls
for a specific length of coax between the calibration instruments and the oscilloscope, i.e. 42 inches. I noticed in the manual for the 191 Constant Amplitiude Signal Generator instuctions to use RG8A/U coax. I have been told RG213/U is the direct replacement for this coax now. Is this a fact? What do you all use? Thanks, Bill ===== Bill Smith KO4NR __________________________________ Do you Yahoo!? Yahoo! Search - Find what you?re looking for faster |
|
Re: More "crispy display" ranting......
jeans
This link should work
toggle quoted message
Show quoted text
<>. Don Black. Jeff W wrote: I came across this 7904 earlier today on the 'bay: |
|
Re: More "crispy display" ranting......
Brian Goldsmith
toggle quoted message
Show quoted text
----- Original Message -----
From: "Jeff W" I came across this 7904 earlier today on the 'bay: ViewItem&item=3801633404&category=45005 Hmm, looks like an OK deal if it worked, as implied. But then as I read thru the text, I came across this statement: "Powers up with a crisp disp., no modules to test the unit. Guaranteed to power up." Huh? sez me. Crisp Display? Anyone that knows anything about 7K mainframes knows that without plugins, you have NO display, let alone a "nice crisp display". So since he has no modules, how does he know it has a "crisp display"? Enquiring minds need to know! **** Ask the seller,if nothing else it will make him realise that he is ,"just a little dodgey". Brian Goldsmith. Yahoo! Groups Links |
|
Re: Manual for Philips PM3200
Andreas Troschka
For manuals and schematics about Philips equipment ask to Toine PD0MHS:
toggle quoted message
Show quoted text
73s de Andreas IK2WQI sreaves22655 wrote: Hello, |
|
R7103
Andreas Troschka
This one is a TEKTRONIX R7103 1GHz analog scope, the rackmount version
of the 7104. I do own both bought during the last year. I've seen really seldom one, and this seems to be in really nice condition (riatla says) and it is calibrated. I don't think somebody will pay more than 500US$ (reserve price!) for it but remember you have also to add the plugins. To be honest you should push in at least a 7A29(also opt.04) and a 7B10/15. But I'd add also 7A24/26 to have the 1MOhm input lower BW alternatives to the 50Ohm of the 1GHz VAmp plugin, and some double timebase of choice. Pay attention on the 3! slots instead of 4 of the 7104! Anyway #3800875191 is the reference. Remember to let you tell about the status of the hard to find Microchannel CRT! I already own one so I'm not personally interested on this scope. Andreas. |
|
Re: 7S/7T Sampling System
Craig Sawyers
Hi Stan
One thing that I did not see in the explanation below is what the risetimePPL measured 20ps as the rise time of the initial event, which exceeds spec of course. But remember that the 500ps delay line they used is only around 4" of rigid air line, not the 50 feet of flexible from the 7M11. This severely lenthens the leading edge with a specified 175ps rise, in spite of all the neat tricks that Tek do with compensation components. Also not mentioned is that the S4, when introduced in 1969, wasWell, I don't think they were knocking older samplers. The S6 was introduced in 1971, and the review had high praise for the *overall* performance of that particular head, even though the rise time is slower at 28ps. Aslo the HP1430A,B and C were in the same review, and the HP1340A was introduced in 1966 with the B and C in 1972. These also give much better settling than the S4, even though the "A" version predates it by three years. They measured 29ps for the A version and 22ps for the C. That review was dated February 1989. However, in spite of what they say, it depends on what you are measuring; if you are looking at only the leading edge, then the S4 is fine. But if circuit behaviour is being looked at out to the ns time domain it might not be the best choice. Craig |
|
Re: Tunnel Diode for 1S1
Stan & Patricia Griffiths
Hi Gang,
toggle quoted message
Show quoted text
I certainly know the part is good. It is the correct firing current which means that it will probably bias correctly in the circuit. The capacitance is quite a lot greater than the original part so it may not switch as fast but it will probably switch OK. Depending on exactly where the tunnel diode in question is in the 1S1 circuit will depend on how well the 1S1 will work with a 152-0125-00 in place of a 152-0214-00. I don't know because I have never tried this before but I would not hesitate to try it. Stan w7ni@... PS I sell these TD's in my Parts Shop also: ----- Original Message -----
From: "Darrin Conniff" <djconniff@...> To: "Greyhawk" <greyhawkeng@...> Cc: <TekScopes@...> Sent: Monday, March 01, 2004 8:06 PM Subject: Re: [TekScopes] Tunnel Diode for 1S1 Hello Greyhawk,know it is quality product. Good luck. plug-in I bought at ebay! While I was cleaning the plug-in I found a Tunnel Diodewith one of its "legs" broken off. I unsoldered it just to see that thesecond leg was also defective. Does anyone know where to find this tunneldiode? It is D304 in the 1S1, Manual says:is there a possible substitution?---- Yahoo! Groups LinksService.
|
|
Re: 647 cal fixture on ebay
Craig Sawyers
And there are/were MANY more.What Tom says about baud rate is quite correct. I was using e-mail at home while we were starting up a business back in 1985. Used an acoustic modem - sort of a pair of sucker pads that fitted on the telephone handset - which chugged along at 300 baud on a good day, and storage was measured in bytes - not even kilobytes. The text-messagers nowadays think they invented acronym-speak - but they are really just responding to communicating in a medium with a strict limit on the number of characters transmitted, viewed on a tiny cell-phone handset, just the same problem as we had in the early to mid '80s. If anyone is interested, there is a very complete list here I think my favourite, just remembered in browsing that list, is BOHICA (bend over, here it comes again). Craig |
|
Tektronix Wire
jdpetrzelka
Been repairing some 500 series plug-ins lately, between the circuit
boards they use mechanical connectors, ribbon cables and some type of coax with little brass eyelets at the ends as plugs, the coax looks about like RG174 but something tells me it isn't. In the parts book it calls out the eyelets but I don't see a refrence to the coax, does anyone know what it is? Or where I can find some, I need about 10 -12 inches for a SC503. Thanks in advance for any info, Jon P. |
|
Re: Is it advisable to turn intensity down when scope is idle (but displaying a signal) to preserve CRT?
That seems to be a matter of taste. For some people, if it is not retina
toggle quoted message
Show quoted text
burning, it is not on. I had hell of a time with test department at the last company. They knew that intensity should not be set high and that I will yell when I see the setting and still it was always set high and when I enter test, they would reach for intensity knob, whether scope was on or off; kind of Pavlovian reflex. Regards Miroslav Pokorni ----- Original Message -----
From: "Craig Sawyers" <c.sawyers@...> To: <tekscopes@...> Sent: Wednesday, March 03, 2004 3:47 PM Subject: RE: [TekScopes] Is it advisable to turn intensity down when scope is idle (but displaying a signal) to preserve CRT? upShould the scope intensity be turned down to some degree or all the wayI usually turn down the intensity on the scope right down if I'm doing too far; you just need a clear trace, not a retina burning event. |
|
Scope 2225 manual
beanrocco
Hi,
Does anyone have a PDF version of the operator and/or service manual and/or calibration procedure for a 2225,50Mhz scope? If so, can you give me the link for download or could you send it to me by e-mail in three separate one. Regards, P.S. I already try the usual LOGSA,etc.. Benoit |
|
7S/7T Sampling System
Stan & Patricia Griffiths
One thing that I did not see in the explanation below is what the risetime
toggle quoted message
Show quoted text
of the S4 is when the delay line is added. Usually the added input C due to a delay line degrades the risetime significantly which is why there is an optional delay line provided by Tek to use for this purpose when using any of the S1, S2, S4 type of heads. Also not mentioned is that the S4, when introduced in 1969, was probably the fastest risetime available in ANY scope at 25 ps. It is easy to critique someone's "state of the art" engineering 35 years later, calling it crude. Of course it was crude by today's standards! I think a more significant measure of how good a design is, is the answer to the question, "How many years did it remain a viable product for the manufacturer?" Of course it is not quite THAT simple since some very good products are terminated artificially early just because the manufacturer decides to do it. In any case the S4 was in production from 1969 through 1989 (21 years) and the only other product mentioned in the note below was the SD24 (1989 to 2001, which is only 13 years). If the SD24 appears in a Tek Catalog past 2001, I could not find it. 21 years is a LONG time for ANY product to be continuously marketed in the world of test equipment. It CAN'T be as bad as it sounds or it would never have lasted 21 years! Stan w7ni@... ----- Original Message -----
From: "Craig Sawyers" <c.sawyers@...> To: "TekScopes Yahoo Group" <TekScopes@...> Sent: Tuesday, March 02, 2004 2:28 PM Subject: RE: [TekScopes] 7S/7T Sampling System IWhile on the sampling gear subject, could someone tell me more about S4. inhave been told that construction of S4 is quite terrible, so stayedthat noise. I gentleman who told me about that, said that he theyaway from it and opted for S6.Well, there are some reports on the Picosecond Pulse labs website that produced during the 80's and early 90's with tests on sampling systems.showed a gradual rise in 4ns to a max overshoot of 5.5% followed by anexponential decay back to the 100% level requiring an additional 25ns."triggering of the TD. The falsely triggered TD pulse would then enter the S4's diodethe waveform continues to rise up to the 105.5% level in about 4ns. It thenand some units used by the author in the past have been as bad as 10%."really good write up by PPL is the SD24. The benchmark for their tests was the |
to navigate to use esc to dismiss