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Re: 7S14 broken plastic backplane connector 386-5467-00 [1 Attachment]
开云体育I took a look at these and as near as I can tell they are not too much different than the standard ones on the back of all the other 7000 plugins. You could easily make one by drilling 4 holes in a standard one and shaving off the excess material of the standard one on a grinding wheel or with a scroll saw. Dennis. ? From: coolcoker@... [Attachment(s) from coolcoker@... included below] I have a broken 7S14 plastic backplane connector here (see photo attached). ? It was used in 7A42, 7D01, 7D02, 7D20, 7L5, 7S12, 7S14 and 7J20 and has the part number 386-5467-00. ? Can someone help and send me one of these to Germany? Of course i would pay for it! Attachment(s) from coolcoker@... 1 of 1 Photo(s) |
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Re: Could please any one give a clue about this nice pulsed line generator??
There are at least 5 variations of RG58, each has its own impedance. RG58
cable is marked along its length with the exact type it is. For more information on the different types of cable see: () RG-58 54 Ohms RG-58A 52 Ohms RG-58B 54 Ohms RG-58C 50 Ohms RG-58AU 50 Ohms All of these have a propagation delay of 1.5417 nsec/foot. There may be two things going on with your problem so I would simplify your setup to see if it clears things up. First, select a coax with 50 ohms (RG58C or RG58AU), not 52 or 54 ohms. Cut a 2 foot long piece of 50 ohm cable and attach it to the Pulse Generator charge line. Since the 2465B has a 500pSec/Div sweep speed I would think you would want a pulse that can be displayed on the CRT within 5nSec. 1 ft of 50 ohm cable will result in a ~3nSec wide pulse. This is because it takes 1ft x 1.54nSec/ft for the pulse to go out to the open end of the cable and 1ft x 1.54nSec/ft for the pulse to return from the open end. In that short time there will be little chance that the pulse will degrade. When you add in the .9nSec rise and 0.9nSec fall time of the 2465B you will have a pulse that will nicely occupy almost all 10 divisions of the CRT that you can use to measure the rise and fall time of your scope. Keep in mind that the entire system rise time (Pulse generator and scope) will be Sqrt (0.3^2 + 0.875^2) = 0.925nSec. Dennis Original Message----- From: iglesia_cristiana_arpas_eternas Sent: Monday, March 18, 2013 5:00 PM Today the Pulse Gen come to live, after replace the weak Q100 transistor by selected from what ever transistor I have in my shop..the winner was a npn switching "MPSH10". The rise time seems to be right on my unfinished to cal high frequency response 2465B scope..paradoxical..I brought this Gen in order to Cal my scopes ..now I haven`t a calibrated scope in this high impulse picosecond domain..to test this Gen..a dog chasing his tail!!! The only I can do is an act of "believe" in avalanche physic & Tek circuit implementation. As you people warning early, make an extension transmission line from common RG58...work but the pulse is not flat, the decay near linearly along his width..about 80ns. Any suggestion about how to make/obtain 15 feet of very good coax cable??? . Also please could any one post a pic on what is expected to see on a 2465B once connected to this Gen, about rise time and flatness?. --- In TekScopes@..., "iglesia_cristiana_arpas_eternas" <iglesia_cristiana_arpas_eternas@...> wrote: transistor burned out come truth. trough a short avalanche transistor. Any way, this nice generator will be fixed (tomorow)....all kind of help& advice will be welcome. Gabriel...from the Holly land of Francisco Pope!!..God bless all of Us.<iglesia_cristiana_arpas_eternas@> wrote: all. I just brought it with the hope work right...but a good service ------------------------------------ Yahoo! Groups Links |
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Re: Wanted: 7CT1N Curve Tracer Plug-In
Mark Wendt
On 03/21/2013 11:37 AM, Bert Haskins wrote:
I cannot tell a lie. I got my 7CT1 last year for $150. Mark |
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Re: Wanted: 7CT1N Curve Tracer Plug-In
开云体育On 03/21/2013 10:36 AM, Richard Solomon
wrote:
???No, I did not get one at that price. Wish I had though since the closing prices have just about triplied in the last five years. This is a want, not a need since I've got that covered every which way but loose. Personally I never buy anything with the intention of reselling it, mainly because I'm just not at all good at it.
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Re: Wanted: 7CT1N Curve Tracer Plug-In
Richard Solomon
You got a deal at $100. I have yet to see one sell for less than $300.
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73, Dick, W1KSZ On Thu, Mar 21, 2013 at 5:32 AM, Bert Haskins <bhaskins@...> wrote:
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Re: Wanted: 7CT1N Curve Tracer Plug-In
John Griessen
On 03/21/2013 07:32 AM, Bert Haskins wrote:
I am looking for a 7CT1N curve tracer plug-in at a reasonable price (no auction prices). Please email me directly.LOL, I've been looking for one for over seven years now with no luck. I tried out owning one for a while, and it was not so easy to use, so I let it go for a little profit. |
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Re: Wanted: 7CT1N Curve Tracer Plug-In
Peter Gottlieb
Same here, haven't been able to find one for under $200 for at least that long. At this point I've just about given up and if I were to need to get to that level of detail on a part I would look at a semiconductor parameter analyzer or program a power supply and DMM over GPIB and have the program draw the curves for me. The 7CT1N is a neat device but its value to others will always exceed that which I am willing to pay.
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Although large, an entire HP 4145A analyzer can be had for less than some people want for the 7CT1N plug-in!! Peter On 3/21/2013 8:32 AM, Bert Haskins wrote:
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Re: Wanted: 7CT1N Curve Tracer Plug-In
开云体育On 03/21/2013 12:44 AM, curlytronics
wrote:
?LOL, I've been looking for one for over seven years now with no luck. And my idea of reasonable is around $100.00. That being said, it's quite easy to build up something that works. As long as you have a good scope and a assortment of resistors the accuracy will be largely dependent on how well you understand what you are doing. Since the little AVR based tester came out the curve tester is only needed for the more exotic things anyway. I now do most of my sorting and grading while sitting upstairs and watching the news. The curve tracers ( 5 at last count ) only get fired up for the special cases. |
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7S14 broken plastic backplane connector 386-5467-00
I have a broken 7S14 plastic backplane connector here (see photo attached).
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It was used in 7A42, 7D01, 7D02, 7D20, 7L5, 7S12, 7S14 and 7J20 and has the part number 386-5467-00.
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Can someone help and send me one of these to Germany? Of course i would pay for it! |
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Re: Help Tektronix 466 repair advice
so i was reading through the manual, and i came across page 251 there is a block diagram that talk mentions some components,
I am not sure if i am on the right track but i measured some voltages of the following. U1724 1- 7V 2-8.8V 3-8.8V 4-0V 5-15V 6-15V 7-16V 8-21V U1762 1-.75V 2-0V 3-7V 4-.7V 5-5V 6-5V 7-6.5V 8-20V I didnt go ahead and do any more testing wanted to wait for some insight as to where to start looking as i am a newbie in fault finding however i want to learn as much as possible! |
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Re: 2440: GPIB
John Miles
开云体育Correct, as far as I'm aware the encoding scheme is solid.? I fixed a bug in my app for the 8753 VNAs a couple of weeks ago, and spent some time to make sure it worked reliably on both USB and Ethernet Prologix dongles.? ?(My testing was done with the current firmware.) ? -- john, KE5FX ? From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Tony Jacobson
Sent: Wednesday, March 20, 2013 10:07 PM To: TekScopes@... Subject: RE: [TekScopes] 2440: GPIB ? DOH!? You’re right, John.? I realized just after I sent my message that I blew it, and forgot to escape the necessary characters in my example! ? It has been a few years since I thought about this problem, so things are a bit foggy.? As I think about it a bit more, I believe that when I originally was trying to do this, the manual made no mention of escaping the escape character itself when it occurs in the data to be sent.? Soon after, there was a firmware and manual update that apparently addressed this.? I don’t think I ever tried the Prologix solution again, because I had what I needed with the NI controller.? However, it seems like I dreamed up some scenario under which the arrangement broke, even when ESC in the data is itself also escaped.? I’ll have to think about this a bit more. ? So I guess you are saying you program does successfully and reliably send binary data with the Prologix controller? ? Thanks for your reply, ? Tony |
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Re: 2440: GPIB
On 03/20/2013 09:19 PM, Tony Jacobson wrote:
I finally sprung for a proper NI controller and was up and running in aI highly recommend GPIB-tcl for use with the NI if by chance you feel comfortable with tcl. I happen to have a complete rewrite of it using the channel driver interface (puts/read/gets/fconfigure/fileevent/etc..) using SRQ as the alert mechanism, but isn't yet ready for public release at this time. |
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Re: 2465 Failures & Serial Numbers
Friank,
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I am also new here and find the people here to be great and eager to help. Because of them, I am in the process of restoring a 2465 I bought cheap on eBay. But your question is difficult to answer. I did an advanced search for messages in this group using the term "best 2465 serial numbers" and found several interesting posts relative to your question. One message saying that the later serial numbers used parts from Maxim corporation that might be hard to replace. Also, the letter codes (B, H, C) told where in the world the scope was assembled (if you care). It is fun reading. My philosophy is much more simple. Tektronix built the best oscilloscope in the world. The 2465 was built in the 80's and 90's and many are still running today. Some may be beter than others but its pretty hard to say that anything that has run this long is "prone to failure". Mac --- In TekScopes@..., "Frank Edwards" <fmedwards3@...> wrote:
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Re: 2440: GPIB
开云体育DOH!? You’re right, John.? I realized just after I sent my message that I blew it, and forgot to escape the necessary characters in my example! ? It has been a few years since I thought about this problem, so things are a bit foggy.? As I think about it a bit more, I believe that when I originally was trying to do this, the manual made no mention of escaping the escape character itself when it occurs in the data to be sent.? Soon after, there was a firmware and manual update that apparently addressed this.? I don’t think I ever tried the Prologix solution again, because I had what I needed with the NI controller.? However, it seems like I dreamed up some scenario under which the arrangement broke, even when ESC in the data is itself also escaped.? I’ll have to think about this a bit more. ? So I guess you are saying you program does successfully and reliably send binary data with the Prologix controller? ? Thanks for your reply, ? Tony ? From: TekScopes@... [mailto:TekScopes@...] On Behalf Of John Miles
Sent: Wednesday, March 20, 2013 10:36 PM To: TekScopes@... Subject: RE: [TekScopes] 2440: GPIB ? ? An "escaped escape" (27 27) sequence will not be interpreted as a semantic "escape" but a literal ASCII 27 character.? If you want to send 27 13, for example, the data you would transmit would be 27 27 27 13.? The first and third 27s would escape the characters that follow them, 27 and 13 in this case.? ? Here's the binary-transmission code from my package: ? // // len = length of original block to send // string = original data to send // ? U8 *text = (U8 *) calloc(len*2, 1); U8 *d = text; ? for (S32 i=0; i < len; i++) ?? { ??C8 ch = ((C8 *) string)[i]; ? ?? if (INI_is_Prologix ???????&& ??????((ch == 27) || (ch == '+') || (ch == 13) || (ch == 10))) ?? ????{ ????? ?*d++ = 27; ????? ?} ? ?? *d++ = ch; ?? } ? // // text = output data to send // d-text = # of bytes to send // ? About the only thing I've used it for has been to transmit VNA calibration data, but it works fine for that purpose. ? -- john, KE5FX ? ? From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Tony Jacobson ? ? So, to send binary data to the GPIB via the Prologix controller you just need to insert an ASCII ESC character before any instances of ASCII CR, LF, ESC, or “+”; the controller will then recognize that the escaped characters are binary data bytes, not commands to the controller.? The controller will strip the added escape characters from the data stream before sending it over the GPIB and everybody will be happy, right?. ?Just one problem:? what happens when the essentially-random binary data you are trying to send contains sequences such as 27 13, 27 10, 27 27, or 27 43?? Well, the Prologix controller will see these byte pairs as escaped single bytes and discard the leading “27” byte from each pair; the result is corrupted data and an incorrect checksum. ? As far as I can see, there is no way this arrangement can reliably send random binary data.? If I am missing something here, I will gratefully accept your criticism (as long as you are reasonably polite about it). |
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Re: 2465 Failures & Serial Numbers
Chuck Harris
Hi Frank,
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You aren't doing anything wrong, except perhaps in believing that the 2465 family suffers from reliability problems. There were something like 500,000 made over the years, and probably fewer than a couple of thousand suffered from the U800 problem. The biggest failure modes in the 2465 family relate to the capacitors in the switching power supply... notably the 180uf 40V and the 250uf 25V. They are over taxed with ripple current, and fail after 30 years. The next biggest problem happens to all 2465B models over serial number 50,000... That is a failure in the surface mount electrolytic capacitors on the controller (A5) board. There are 4 that need replacing, and the collateral damage around them needs cleaning up. Not a big deal. Other than that, the problems that show up are routine, and random. The fans, being mechanical, will need service, or replacement. -Chuck Harris Frank Edwards wrote: I am new here, and I'm trying to learn and asked the question below two days ago. |
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Re: 2440: GPIB
John Miles
开云体育An "escaped escape" (27 27) sequence will not be interpreted as a semantic "escape" but a literal ASCII 27 character.? If you want to send 27 13, for example, the data you would transmit would be 27 27 27 13.? The first and third 27s would escape the characters that follow them, 27 and 13 in this case.? ? Here's the binary-transmission code from my package: ? // // len = length of original block to send // string = original data to send // ? U8 *text = (U8 *) calloc(len*2, 1); U8 *d = text; ? for (S32 i=0; i < len; i++) ?? { ??C8 ch = ((C8 *) string)[i]; ? ?? if (INI_is_Prologix ???????&& ??????((ch == 27) || (ch == '+') || (ch == 13) || (ch == 10))) ?? ????{ ????? ?*d++ = 27; ????? ?} ? ?? *d++ = ch; ?? } ? // // text = output data to send // d-text = # of bytes to send // ? About the only thing I've used it for has been to transmit VNA calibration data, but it works fine for that purpose. ? -- john, KE5FX ? ? From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Tony Jacobson
Sent: Wednesday, March 20, 2013 9:20 PM To: TekScopes@... Subject: RE: [TekScopes] 2440: GPIB ? ? So, to send binary data to the GPIB via the Prologix controller you just need to insert an ASCII ESC character before any instances of ASCII CR, LF, ESC, or “+”; the controller will then recognize that the escaped characters are binary data bytes, not commands to the controller.? The controller will strip the added escape characters from the data stream before sending it over the GPIB and everybody will be happy, right?. ?Just one problem:? what happens when the essentially-random binary data you are trying to send contains sequences such as 27 13, 27 10, 27 27, or 27 43?? Well, the Prologix controller will see these byte pairs as escaped single bytes and discard the leading “27” byte from each pair; the result is corrupted data and an incorrect checksum. ? As far as I can see, there is no way this arrangement can reliably send random binary data.? If I am missing something here, I will gratefully accept your criticism (as long as you are reasonably polite about it). |
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Re: 2440: GPIB
开云体育I have another example for you:? ? I bought a Prologix USB controller about 4 years ago to use with my HP 1631D logic analyzer.? This primitive beast (the 1631D) has no non-volatile storage for configurations or acquired data, and setting up the same complex configuration manually over and over again each time you switch the analyzer off/on can get quite tedious.? I bought the Prologix with the expectation of being able to read the analyzer configuration to my PC and save it to disk, then write it back to the analyzer later.? (These functions are supported by the 1631D.) ? I set about the task of learning a bit of Pascal and using Ulrich Bangert’s EZGPIB program.? I immediately had problems because the analyzer configuration data must be sent and received over GPIB as raw binary data with a checksum appended.? I identified some possible problems with EZGPIB and contacted Ulrich for assistance.? He was very accommodating and made some changes/improvements to EZGPIB based on my dilemma.? However, after several days of trying to get things working, I was unable to successfully send the binary data back to the analyzer in its correct form. ? From the Prologix manual: ? “7.1. Binary Data Transmission Prologix GPIB-USB controller can send and receive binary data to and from GPIB enabled instruments. No special action is necessary to receive binary data from instruments. Any binary data received from the instrument is transmitted over USB to PC unmodified, just as with ASCII data. Since binary data from instruments is not usually terminated by CR or LF characters (as is usually the case with ASCII data), you may want to use the ++eot_enable command to detect EOI indicating end of data. See ++eot_enable command help for more details. Special care must be taken when sending binary data to instruments. If any of the following characters occur in the binary data -- CR (ASCII 13), LF (ASCII 10), ESC (ASCII 27), ‘+’ (ASCII 43) – they must be escaped by preceding them with an ESC character. For example, to send the following (decimal) binary data: 00 01 02 13 03 10 04 27 05 43 06 it must be escaped as follows: 00 01 02 27 13 03 27 10 04 27 27 05 27 43 06 Further more, most instruments will get confused if GPIB termination characters, such as CR or LF, are appended to binary data. Use ++eos 3 command to disable such behavior. See ++eos command help for more details..” ? So, to send binary data to the GPIB via the Prologix controller you just need to insert an ASCII ESC character before any instances of ASCII CR, LF, ESC, or “+”; the controller will then recognize that the escaped characters are binary data bytes, not commands to the controller.? The controller will strip the added escape characters from the data stream before sending it over the GPIB and everybody will be happy, right?. ?Just one problem:? what happens when the essentially-random binary data you are trying to send contains sequences such as 27 13, 27 10, 27 27, or 27 43?? Well, the Prologix controller will see these byte pairs as escaped single bytes and discard the leading “27” byte from each pair; the result is corrupted data and an incorrect checksum. ? As far as I can see, there is no way this arrangement can reliably send random binary data.? If I am missing something here, I will gratefully accept your criticism (as long as you are reasonably polite about it). ? I had an idea that I intended to present to Prologix, but never did.? The idea was to have a special binary transfer mode that could be entered by sending a specific command sequence to the Prologix controller.? In this mode, binary data would be sent via USB to the controller as ASCII text representing the binary data to be sent, so that, e.g., the byte 0x7a (hex) would be sent as its ASCII representation, “7a” = 0x37 0x61 or “7A” = 0x37 0x41.? Now only the ASCII characters “0”-“9” and “a”-“f” or “A”-“F” would be sent, and nothing would need to be escaped.? To exit this binary mode, you would send a special command sequence that does not begin with one of these characters.? The only problem is the data is now twice as large. ? Anyway, after futilely attempting to accomplish my task for days with the Prologix controller, I finally sprung for a proper NI controller and was up and running in a few hours with a bit of C programming. ? Fortunately, it seems many instruments only send and receive GPIB data as ASCII to begin with, so this is not an issue for the majority of users. ? Sorry for the long post; thanks for your indulgence. ? Best Regards, ? Tony ? ? From: TekScopes@... [mailto:TekScopes@...] On Behalf Of David Graveux
Sent: Wednesday, March 20, 2013 10:46 AM To: TekScopes@... Subject: Re: [TekScopes] 2440: GPIB ? ? On 03/19/2013 08:28 PM, David Gravereaux wrote: |