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Re: 2711 lost tracking generator
Hi,
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When the tracking generator is installed in the 271x analyzers, it is immediately recognized by the CPU. I would take a close look at the interconnections between the power supply board (J4) and the tracking generator board (J300). I doubt that the low backup battery has anything to do with this particular problem. Out of curiousity, when you check the "Installed Options" in the Utility menu, what do you see? Brian Henry jminn699 wrote: I am working on a 2711 that has lost its tracking generator. The |
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Re: New file uploaded to TekScopes
Joe Rooney
--- In TekScopes@..., "Didier Juges" <didier@...> wrote:
the SA to max attenuation BEFORE connecting anything else and powering up.Only then, you can reduce attenuation until you see something.cap should always be discharged when connected, however there is a risk that acap, as it will let pretty good, low frequency transients go through.power supply ripple measurements), I have not blown a front end yet. YMMV... I'd like to add another cautionary note. We used to see sampling heads, especially the S6 arriving with a destroyed diodes at the service centers with customers expressly keeping terminators and attenuators to minimize destructive reflections. But the biggest culprit in my unproven opinion was emfs produced when cables were wiggled (ostensibly to see if there was an intermittent). The movement of the polyethelylene across the metallic conductors could in theory, produce hundreds of volts, albeit for a very short duration. Longer cables, often being tested by a labratory TDR seemed to be involved when I would debrief customers about circumstances. Joe Rooney |
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Re: New file uploaded to TekScopes
Didier Juges
TekScopes@... wrote:
Multilayer ceramic capacitors are becoming more and moreJohn, I recommended the setup AND the procedure, which includes setting the SA to max attenuation BEFORE connecting anything else and powering up. Only then, you can reduce attenuation until you see something. With the 10k discharge resistors at each end of the DC block, the cap should always be discharged when connected, however there is a risk that a transient coming from the input device would go through the 10uF cap, as it will let pretty good, low frequency transients go through. In over 20 years of doing that (a lot, it's a routine test for power supply ripple measurements), I have not blown a front end yet. YMMV... Didier KO4BB |
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Re: [TekScopes2] Re: 7854 problems
Tomas
Had the calibrator to ch1/Left, stable +/-2 div signal centered on the
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display. All other chanels where of. With best regards Tomas Larsson TL Engineering & Consultants Engelbrektsgatan 121 SE 506 39 Bor?s Sweden +46 739 932 673 -----Original Message----- |
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Re: 7854 problems
Dave Casey
I have had this happen before. Setup the scope with a single waveform (i.e calibrator signal), make sure your timebase is beig triggered (near as I can tell, the acquisition doesn't happen until an event is triggered so as to capture a single shot event), and then try to acquire.
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I have encountered the situation you describe when trying to capture an X-Y display or several traces at once, but not for a single trace. I'll have my calculator keyboard Friday, at which point I can really start checking out the scope... Dave Casey ----- Original Message -----
From: Tomas To: TekScopes@... ; TekScopes2@... Sent: Tuesday, October 14, 2008 3:51 PM Subject: [TekScopes] 7854 problems Dear group. Started to play around with my newly acquired 7854. Ran into some problems directly. Havent had time to go through it yet, will obviously need to do that. This is what's happening. Analog part seems to work ok all traces and other analog functions seems to be in order. Digital part, here comes the problem. When it starts, POST is reported OK. Sometimes the panel keys doesn't work/respond but calculator keybord is ok. When I hit AQR, the busy-led lights up and the screen starts to flicker. It does not stop by itself, just keeps on going. Hitting stop, it reverts to normaland AQR/WFM-error is displayed on the screen and no waveforms stored. Any-one seen this before, if so, where to start to look? With best regards Tomas Larsson TL Engineering & Consultants Engelbrektsgatan 121 SE 506 39 Bor?s Sweden +46 739 932 673 Verus Amicus Est Tamquam Alter Idem -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.4.7 (MingW32) mQGiBEhFpFgRBADVkG89wwwJOYAoMjRsgyhcm5W3winq7oVew4skWbZD5AUlfDdw iAaoM8pIXChnXWw38skNBh7NdMP73JyemoIrcCfa9qQg45FGTxo/Is97iD67s4nQ VEmjpuqpTT86hiymLWrLZ4mxDi7rjyYpEzMaV22WVkGUe+CHGuS3qgL5/wCg6Ru3 Y0Pnlp4rQVSRg180w2QwHEUEAK146rdM9d5cILPlo44vSlyuFAIv6rWeF6aC0U1h lt4AF8hWeYghXzcN5mgJgEtT5ll5FdqVwgmKTMfmVuo76Q3Rwk37NvizPmS3jSDe bsnS0KltYqZ4CZ8KKtHqOZYGmiVgxVkI3WtMqaKUju6va60aRcehN2fT2L5qXaE3 pOWxA/4gLT3tjxf7HmSCtb1+G4FTpRQ9zWxkmDV0qC4RhzcHlj9F14o7SpXMndnJ F0oCplnjhW4bMGOvMZFGw//v36dCz2vSE4KE7oj7rhCqFun8rklRdwNYFDW2yIHy FHzM6SvlLBB8DhXOIEq2PXnGy8YnOCFf1gQu1JChB2EroXQGxbQjVG9tYXMgTGFy c3NvbiBIZW1tYSA8dG9tYXNAdGxlYy5zZT6IYAQTEQIAIAUCSEWkWAIbIwYLCQgH AwIEFQIIAwQWAgMBAh4BAheAAAoJEM8L+xprH7d5qJsAn2dUdOzU5fAOF0oUpBp9 ytNJXkVcAKDhXRQkciHSJEop87WodUN3fM2OjbkBDQRIRaRYEAQAo/lRwYLEupsl h86TW1oWM4XFuh/LjIus7tBZBMRuEeiv71HIsK2yJKPu+dc09tSNshX9gmPN1bXN jhPZwO8PgbeAqgnerOKgysMQofsmywoEXmCDIsTDxw1JfGj4dy1gR9wDStzcMPAG 8Gy4kntctEMCrMgDSM9jp1ZWPYvGA4MAAwYD/2W/h4zNbVWb/X9560wR/hNimPml qi6jSC/TiSG8KIuE5Vw8IdgX3vNNvEF7bTxcRokngIb9+FlMIebaM23CMEkbZB53 XwKvy9OqldjMDKKBVzD5IznqiS3uOkQI8UyGzzLY2FHL/azRtpTYy0hlGW7Lqa2+ XbBgQi9BN2UPhF8HiEkEGBECAAkFAkhFpFgCGwwACgkQzwv7Gmsft3mj3QCgwYZD FJc9zt88euTsWwnjz0jowVoAn0+nWG4RE84G2zyP1d2WLP4z7HRp =mM3w -----END PGP PUBLIC KEY BLOCK----- [Non-text portions of this message have been removed] |
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7854 problems
Tomas
Dear group.
Started to play around with my newly acquired 7854. Ran into some problems directly. Havent had time to go through it yet, will obviously need to do that. This is what's happening. Analog part seems to work ok all traces and other analog functions seems to be in order. Digital part, here comes the problem. When it starts, POST is reported OK. Sometimes the panel keys doesn't work/respond but calculator keybord is ok. When I hit AQR, the busy-led lights up and the screen starts to flicker. It does not stop by itself, just keeps on going. Hitting stop, it reverts to normaland AQR/WFM-error is displayed on the screen and no waveforms stored. Any-one seen this before, if so, where to start to look? With best regards Tomas Larsson TL Engineering & Consultants Engelbrektsgatan 121 SE 506 39 Bor?s Sweden +46 739 932 673 Verus Amicus Est Tamquam Alter Idem -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.4.7 (MingW32) mQGiBEhFpFgRBADVkG89wwwJOYAoMjRsgyhcm5W3winq7oVew4skWbZD5AUlfDdw iAaoM8pIXChnXWw38skNBh7NdMP73JyemoIrcCfa9qQg45FGTxo/Is97iD67s4nQ VEmjpuqpTT86hiymLWrLZ4mxDi7rjyYpEzMaV22WVkGUe+CHGuS3qgL5/wCg6Ru3 Y0Pnlp4rQVSRg180w2QwHEUEAK146rdM9d5cILPlo44vSlyuFAIv6rWeF6aC0U1h lt4AF8hWeYghXzcN5mgJgEtT5ll5FdqVwgmKTMfmVuo76Q3Rwk37NvizPmS3jSDe bsnS0KltYqZ4CZ8KKtHqOZYGmiVgxVkI3WtMqaKUju6va60aRcehN2fT2L5qXaE3 pOWxA/4gLT3tjxf7HmSCtb1+G4FTpRQ9zWxkmDV0qC4RhzcHlj9F14o7SpXMndnJ F0oCplnjhW4bMGOvMZFGw//v36dCz2vSE4KE7oj7rhCqFun8rklRdwNYFDW2yIHy FHzM6SvlLBB8DhXOIEq2PXnGy8YnOCFf1gQu1JChB2EroXQGxbQjVG9tYXMgTGFy c3NvbiBIZW1tYSA8dG9tYXNAdGxlYy5zZT6IYAQTEQIAIAUCSEWkWAIbIwYLCQgH AwIEFQIIAwQWAgMBAh4BAheAAAoJEM8L+xprH7d5qJsAn2dUdOzU5fAOF0oUpBp9 ytNJXkVcAKDhXRQkciHSJEop87WodUN3fM2OjbkBDQRIRaRYEAQAo/lRwYLEupsl h86TW1oWM4XFuh/LjIus7tBZBMRuEeiv71HIsK2yJKPu+dc09tSNshX9gmPN1bXN jhPZwO8PgbeAqgnerOKgysMQofsmywoEXmCDIsTDxw1JfGj4dy1gR9wDStzcMPAG 8Gy4kntctEMCrMgDSM9jp1ZWPYvGA4MAAwYD/2W/h4zNbVWb/X9560wR/hNimPml qi6jSC/TiSG8KIuE5Vw8IdgX3vNNvEF7bTxcRokngIb9+FlMIebaM23CMEkbZB53 XwKvy9OqldjMDKKBVzD5IznqiS3uOkQI8UyGzzLY2FHL/azRtpTYy0hlGW7Lqa2+ XbBgQi9BN2UPhF8HiEkEGBECAAkFAkhFpFgCGwwACgkQzwv7Gmsft3mj3QCgwYZD FJc9zt88euTsWwnjz0jowVoAn0+nWG4RE84G2zyP1d2WLP4z7HRp =mM3w -----END PGP PUBLIC KEY BLOCK----- |
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Re: Interesting 547..........
Dick Ballard
Yes, it is a prototype. Specifically a unit numbered 09 of the B phase
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pre-production build (perhaps 10-20 units), this one assigned to ENGineering. Earlier in the process, A phase instruments were the very first prototypes often built with rather crude and messy simulations of the final product. Full production usually followed the B phase build, although technically there were two more production phases, C and D. Deane Kidd, the New Product Introduction (NPI) Manager for many years, could add more details here. The quality and performance of B phase units would usually be very close to "for sale" instruments. That quality level would vary according to the cleanliness of the design/evaluation process. The B phase instruments would have a number of changes from when they were first built that would incorporate the results of intensive testing and evaluation of that group of products. In today's software terminology, the closest analog would be a beta release except that the B phase instruments were not sold or released to the public. Obviously many of those units have eventually found their way to the market place. A common pathway is the "permanent loan" policy in place for many years where a Tek engineer could take one of these home for an indefinite period, to be returned when leaving the company. As time went on quite a few of these were never recaptured by Tek as the company grew and engineers drifted elsewhere. Dick Ballard ballardr@... On Mon, 13 Oct 2008 18:19:18 -0000, you wrote:
Hopefully someone here can help. I have just aquired a 547 (thanks |
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Re: Interesting 547..........
Preproduction instruments were designated "A-phase" or "B-phase".
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These have an informal serial number that starts at 01. The B means that this is a B-phase instrument, not that it was made in Beaverton (though it probably was). A-phasers are early engineering experiments and are usually hacked to pieces inside. They rarely meet spec. B-phasers are production dress-rehearsals and most can work okay. Dave Wise ex-Tek Design Engineer for Information Display in Wilsonville. -----Original Message----- |
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Re: New file uploaded to TekScopes
John Miles
Multilayer ceramic capacitors are becoming more and more common these days,
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up to about 100 uF, as replacements for conventional tantalum electrolytics. However, I'd be reluctant to use 10 uF in a general-purpose DC block for a spectrum analyzer. It takes about a microjoule to hose a mixer diode, which is what you get with a 0.1 uF capacitor charged to 5 volts. I wouldn't use a 10 uF cap without at least 10 or 20 dB of RF attenuation after it. -- john, KE5FX -----Original Message----- |
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Re: New file uploaded to TekScopes
John Rehwinkel
File : /Helpful tools you can build/Scope tools.pdfThose are handy, but the DC isolator refers to a 10?f ceramic capacitor. I suspect that should be a monolithic, film or even a non- polarized electrolytic, but ceramic? ¨C John |
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2711 lost tracking generator
jminn699
I am working on a 2711 that has lost its tracking generator. The
inside factory label lists installed options 3-4. and indeed the TG output connector is present. when you press the DEMOD/TG button it shows only items 1&2 item 4 is missing. If you go to UTIL [3] only item 1 & 2 show up, item 3 is missing. Could this problem be caused by a low backup battery? Both batteries measure less than 2.4 volts. Anyone have any ideas? Thanks |
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Re: Tek A6901 manual or circuit please
--- In TekScopes@..., "oldtestgear" <philip.parsons@...>
wrote: as "faulty". Which it seems to be!useful when I (finally) get back to troubleshooting the SMPS in my 2465scope which suffered a catastrophic failure when the main supply cap let go.Schematics are only a few pages - I can make the scans. Contact me off list. /H?kan |
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Tek A6901 manual or circuit please
oldtestgear
I just bought one of these which was accurately described as "faulty".
Which it seems to be! Before I start pulling it apart does anyone have either a manual or circuit diagram they can share with me? I thought this might be useful when I (finally) get back to troubleshooting the SMPS in my 2465 scope which suffered a catastrophic failure when the main supply cap let go. Thanks in advance for any info. Phil. |
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Tektronix 475 Timebase Variable switch problem
I have a bent inner rod on the Var control/switch. When I rotate the
Var, the switch on the board moves, because the long rod is bent, and it won't be long before the solder breaks loose. How can I remove the inner rod to straighten it? I tried to pull it out from the front, but it is catching on something and I am afraid if I pull too hard, I may damage the inside of the CAM switch. Can this inner rod be removed safely somehow without damaging the outer CAM switch? Another issue I am having is there is some dirt in the focus and intensity controls. These controls are plastic and I do not see a hole to jet some contact cleaner in it, any ideas on cleaning it? |
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Busted 7613
Dave Casey
So I have a 7613 here that is complete but has obviously seen better days. The scope powers on quietly but after a few seconds, the whole screen gets flooded green. Instensity/storage adjustments make no difference. I didn't think to mess with the focus before I did some exploratory surgery.
Anyway, it's almost back together at which point I'll check the voltages as a start. It has obviously taken a hard hit at the back end as the cast aluminum frame at the rear is broken in three places. I'm trying to decide if the scope works well enough to remove and weld the frame or if it should become a parts mule. Anybody seen the CRT get flooded like this? Things I should be looking for? Thanks! Dave Casey |
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7623 Z-axis wiring
Kurt
Gentlemen,
I have a 7623 (not a 7623A) with some problems. The screen is dim, the readout is faint, and the storage is a mess. For starters, I'd like to get non-store mode in order. The scope makes a scratchy buzzing sound for 30 seconds at power-up and induces noise in surrounding audio equipment. The HV test point is -1475V. I want to test the PDA voltage. To measure this with the PDA lead attached to the CRT, I need to probe at the HV multiplier. It seems like the HV section in a 7623 is unusually difficult to get to. Is this the case, or am I missing something? There is a connector, P1120, on the Z-axis board. There are two more wires that attach to the Z-axis board right next to P1120. One is to the left and one is to the right. The wires are tabeled "A" and "B" in the schematic. One of those two wires is white with a brown stribe. The other wire is white with a red stripe. Does anybody know which wire goes to the left of P1120 and which goes to the right of P1120? Also, what are the differences between a 7623 and a 7623A? thanks, -kurt |
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New file uploaded to TekScopes
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the TekScopes group. File : /Helpful tools you can build/Scope tools.pdf Uploaded by : n5ztw <n5ztw@...> Description : Helpful tools for scopes and SAs You can access this file at the URL: To learn more about file sharing for your group, please visit: Regards, n5ztw <n5ztw@...> |
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Re: Interesting 547..........
Joe Rooney
--- In TekScopes@..., "David" <gavinator68@...> wrote:
usually goes. I am under the impression that it is a prototype and washoping one of you retired Tektronix guru's might shed some light on it.Hi David, Stan may be able more clearly describe prototyping schemes, all I ever saw were B variants and a few sn's below 101. Back before the prefix B designated Beaverton, reportedly there were A prototype prefixes, but I never saw one in the field. They were engineering models or first manufacturability runs. Originally, they were never to be sold, some were on permanent loan to deserving employees. (I never got one) There was a guy in the eighties that stole and subsequently sold a bunch of these items. Eventually he got caught and that is probably what you got. Or some disgruntled, but previously deserving employee that had one on permanent loan, sold his. I haven't a clue what happens at Danaher/Tek these days, maybe Stan could say whether the country store is still open. The original serial numbers for catalog items started at 101. Cal fixtures and non-catalog items used serial numbers, generally starting at 1. The B prefix designated Beaverton and as other manufacturing facilities were erected worldwide, there were other prefixes. Production runs started at B010101 and the original scheme was to raise the sn's when a major rework occurred. B020101. That got kind of ragged with high volume instruments. Joe Rooney |
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Interesting 547..........
David
Hopefully someone here can help. I have just aquired a 547 (thanks
Christian) that is stamped (ENG) in the left oval under the model number and (B 09) in the right oval where the serial number usually goes. I am under the impression that it is a prototype and was hoping one of you retired Tektronix guru's might shed some light on it. Cheers, David |
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Re: 465B z-axis Problem solved --- Some extra notes on removing troublesome components
Minor correction to my previous post titled:
Some extra notes on removing troublesome components The line that reads: "holding things together) has a higher melting point than 118¡ãF ," should be "holding things together) has a higher melting point than 158¡ãF ," |
zenith5106
Philip Freidin
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