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Re: Using a 7A16P in a 7904 mainframe
Lynn Lewis
If it works and If the shipping is low and If you can trust the seller, --
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it's a good price. -----Original Message-----
From: JOSE V. GAVILA (EB5AGV/EC5AAU) [mailto:eb5agv@...] Sent: Thursday, January 17, 2002 1:52 AM To: TekScopes@... Subject: [TekScopes] Using a 7A16P in a 7904 mainframe Hello! I wonder if the above mentioned combination will work fine. I have been offered a curious (to me at least!) setup: 7904 + 7A16P + 7B92. It has some trouble with signals over 100MHz (it seems a timebase trouble, as with another 7B92, it works fine, seller says). Price is $100. What do you think? Regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Using a 7A16P in a 7904 mainframe
JOSE V. GAVILA (EB5AGV/EC5AAU)
Hello!
I wonder if the above mentioned combination will work fine. I have been offered a curious (to me at least!) setup: 7904 + 7A16P + 7B92. It has some trouble with signals over 100MHz (it seems a timebase trouble, as with another 7B92, it works fine, seller says). Price is $100. What do you think? Regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: |
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Re: Digitizer on eBay
Lynn Lewis
Stan
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I forget to look for a part number. What you said sounds right to me. I like the idea of a coaxial relay. Are they used in anything else? I'll probably be asking about pinouts later. Thanks. Dick, I solved my power supply problem, except it wasn't actually the power supply. One of the cables going to the calibration board was plugged in backward (P10D, I think). They symptoms were, nothing worked except the little bulb in the power supply (??19). You could here it going tik, tik, tik but the graticule lights didn't even come on. I got pretty intimate with the schematic but I'm afraid you didn't give me much to go on. By the way, with mine, the 5 volt supply was also less than a volt. More to come. -----Original Message-----
From: Stan or Patricia Griffiths [mailto:w7ni@...] Sent: Thursday, January 17, 2002 12:46 AM To: TekScopes@... Subject: Re: [TekScopes] Digitizer on eBay Hi Lynn, After taking a look at the eBay pictures, I have to admit that in my 26+ years at Tek, I have never seen this thing. Tek made a lot of LARGE systems of 7912's (digitizers, like we have been discussing here) for the military. I think many of those systems have been broken down into pieces for sale on the surplus market. This looks like one of the pieces of such a system for routing standard signals to the individual 7912's (or maybe 7612's) to verify system performance prior to using the system to gather data during a test. No doubt, there are many coaxial relays inside the box and the two blue connectors are used to control the opening and closing of those relays for routing signals. Most of these types of equipment never appeared in any catalog since they were custom-made in very low quantities. Stan w7ni@... Lynn Lewis wrote: > I've decided to pass on the digitizer. I've bought enough "toys" already > (toy=something to take apart to see if there is anything useful in it), > including an HP1630D. Right now, I have a 7704A scattered across my > workbench. > > I've always worried about those EMPs. I've though about adding ferrous > shielding around my hard drive in case a nuke hit close by <:-) > > Here is the link to the Auto-Cal Steering Unit on ebay: > > 720 > I'll check for a part number when I get back to the office later today. > > It's made by Tektronix. It's rack mounted but no hinged door. It has a > multitude of BNC connectors. Inside (besides lots of room, which I find > unusual for Tektronix) there is a horizontal metal partition between the top > section and the bottom section to which the circuit boards are attached, > also horizontally. On the bottom of the partition is a (well made, easy to > get to) power supply that provides +5, +15, -15, and -5.2vdc. The other > boards are on top of the partition. Most of the cables from the BNC > connectors go to a board with a bunch of flat "relays". Each relay has one > input and (I forget) maybe 4 outputs. It's purpose is obviously to "steer" > a signal from one input to one of several outputs, depending on instructions > sent by the other (logic?) boards. The logic boards apparently attached to > something via the centronics like connectors and that something determined > the "route" of the signal. I'm thinking that it may have routed several > calibration devices to an output so that once hooked up, you could change > inputs automatically without having to unplug and replug cables all the > time. In any case, it's a very nice box but I'm going to explore it a while > before I decide whether to gut it or not. > > Lynn Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: Digitizer on eBay
Stan or Patricia Griffiths
Hi Lynn,
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After taking a look at the eBay pictures, I have to admit that in my 26+ years at Tek, I have never seen this thing. Tek made a lot of LARGE systems of 7912's (digitizers, like we have been discussing here) for the military. I think many of those systems have been broken down into pieces for sale on the surplus market. This looks like one of the pieces of such a system for routing standard signals to the individual 7912's (or maybe 7612's) to verify system performance prior to using the system to gather data during a test. No doubt, there are many coaxial relays inside the box and the two blue connectors are used to control the opening and closing of those relays for routing signals. Most of these types of equipment never appeared in any catalog since they were custom-made in very low quantities. Stan w7ni@... Lynn Lewis wrote: I've decided to pass on the digitizer. I've bought enough "toys" already |
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Re: WTD: 7704A Power Supply
Lynn Lewis
I'm going to be doing some 7704A power supply troubleshooting this evening
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myself. If you'll tell me everything you know about your problem, I'll keep it in mind while I'm working (or while its fresh on my mind, anyway). Maybe we'll get lucky. -----Original Message-----
From: w1ksz [mailto:w1ksz@...] Sent: Wednesday, January 16, 2002 5:23 PM To: TekScopes@... Subject: [TekScopes] WTD: 7704A Power Supply I have a very clean 7704A with a sick Power Supply. Anyone have one they will part with ? Thanks, Dick, W1KSZ Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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cables
Lynn Lewis
I learned to use an oscilloscope in Tech School at Lowry AFB in 1966. The
next time I used one was last December - over 35 years later. You forget a lot in 35 years. I have scopes. I have probes. I have a frequency counter and I have a function generator. I have 52 ohm coax and I can crimp BNC connectors. Anyway, to the point. On a 7904: when I ran a short cable from a T on "VERT input" to "TRIGGER in" while looking at the 1KHz square wave, the square wave wasn't square anymore. It occurs to me that I need to make myself some auxiliary cables (BNC to BNC, BNC to alligator, etc.) to connection various things in the most useful way. I would welcome suggestions for designing and building a variety of such cables. What do you guys use??? |
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Tek DC 510 module fault
petes7457
Hi,
I recently purchased a DC 510 module which works fine except for an occassional tendancy to go haywire displaying random garbage and only intermittently displaying the correct value. When the unit exhibits this fault the self test routine returns error (?) numbers 330, 331, 332 or 333. I'm only driving channel A at present. Does anyone have access to a manual or suggest where to start looking to localise and correct this fault? Kind regards, Pete |
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Re: Digitizer on eBay
Lynn Lewis
I've decided to pass on the digitizer. I've bought enough "toys" already
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(toy=something to take apart to see if there is anything useful in it), including an HP1630D. Right now, I have a 7704A scattered across my workbench. I've always worried about those EMPs. I've though about adding ferrous shielding around my hard drive in case a nuke hit close by <:-) Here is the link to the Auto-Cal Steering Unit on ebay: 720 I'll check for a part number when I get back to the office later today. It's made by Tektronix. It's rack mounted but no hinged door. It has a multitude of BNC connectors. Inside (besides lots of room, which I find unusual for Tektronix) there is a horizontal metal partition between the top section and the bottom section to which the circuit boards are attached, also horizontally. On the bottom of the partition is a (well made, easy to get to) power supply that provides +5, +15, -15, and -5.2vdc. The other boards are on top of the partition. Most of the cables from the BNC connectors go to a board with a bunch of flat "relays". Each relay has one input and (I forget) maybe 4 outputs. It's purpose is obviously to "steer" a signal from one input to one of several outputs, depending on instructions sent by the other (logic?) boards. The logic boards apparently attached to something via the centronics like connectors and that something determined the "route" of the signal. I'm thinking that it may have routed several calibration devices to an output so that once hooked up, you could change inputs automatically without having to unplug and replug cables all the time. In any case, it's a very nice box but I'm going to explore it a while before I decide whether to gut it or not. Lynn -----Original Message-----
From: Stan or Patricia Griffiths [mailto:w7ni@...] Sent: Wednesday, January 16, 2002 12:43 AM To: TekScopes@... Subject: Re: [TekScopes] Digitizer on eBay Lynn, If you are talking about the 7912, it is good for making extemely fast, single-shot measurements. Very handy for things like nuclear explosions . . . when you need to catch the EMP on your screen. Is this "Auto-Cal Steering Unit" a Tektronix item? Does it have anything like a Tek part number on it? Is it a rackmounted item with a hinged door on the front? Stan w7ni@... Lynn Lewis wrote: > I guess that conversation took place before I joined. Could someone tell > me - briefly - what the digitizer is good for? And what else would one need > to go with it to make it useful? > > P.S. I recently bought a box called an Auto-Cal Steering Unit. I actually > bought it for the box ($5 + S&H) > but now that I've looked inside, I find it intriguing. I'm especially > curious as to what connects to the two > centronics-like connectors on the back. Any background would be > appreciated. > -----Original Message----- > From: Craig Sawyers [mailto:c.sawyers@...] > Sent: Tuesday, January 15, 2002 2:57 AM > To: TekScopes@... > Subject: [TekScopes] Digitizer on eBay > > Hi > > A heads-up for anyone wanting a 7912 digitizer that we were discussing on > the list a few days ago. There is one listed on eBay, item 1690813203 > with > a $19.99 start bid. It weighs 70lb, so it is not one for me - shipping > costs to the UK would be astronomical. > > Craig > > Yahoo! Groups Sponsor > ADVERTISEMENT > > To unsubscribe from this group, send an email to: > TekScopes-unsubscribe@... > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > > > > > To unsubscribe from this group, send an email to: > TekScopes-unsubscribe@... > > > > Your use of Yahoo! Groups is subject to Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: Digitizer on eBay
Don Black
Once I had a little problem with my septic tank (sewerage system) and needed to get
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some air into it. I went to the local pet shop and bought a fish tank pump that did the job just fine. However, they also had a special; a free gold fish with every purchase. Terrific. Then of course, I needed a tank, filter, gravel, underwater toys and Doo Dads. I already had the pump (when not otherwise in use, it had two outlets anyway). So after getting all the accessories all was well, with fishy happily swimming round in his new home, until one day he went to the great fish tank in the sky. A friend finally got the tank, etc. Now if I go to buy a reel of solder and the day's special is a Tek. Digitizer, well perhaps I'll just pass it up. Still, if ever I need to conduct any underground tests? I know how you feel Dieter. At least you won't have to buy a manual for the next one. Cheers, Don Black. Dieter Teuchert wrote: Hi, |
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Tektronix 7612D users?
JOSE V. GAVILA (EB5AGV/EC5AAU)
Hello!
I wonder if anybody uses that digitizer... If so, what do you think of it? Best regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: |
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Re: Digitizer on eBay
Hi,
here is some hands-on experience with buying a 7912AD at ebay: Half a year ago i got a 7912AD at ebay for US $ 50. It was shipped from US to Germany by USPS surface for about US $ 90. When it arrived it was in good shape, though the processor hang on powerup self tests. Anyway it is a really interesting device: Its circuits are about 3 times more complex than a normal 7000 scope. It has everything inside that was high-tec in the 80s, from ECL to AM2900 bit slice processor. Its modular switched 350 W power supply must have been a shock for Tek competitors (appears to be prototype of modern PC power supplies). So i decided to buy service manuals and fix it. This was another US $ 300 + about 20 hours of work. In addition i bought a programmable amplifier 7A16P and a programmable time base 7B90P for about US $ 120 + shipping. Later i noticed, that 7A16P is the proper amplifier for a 7612 digitizer and i needed a 7A29P instead. That one i got for another US $ 170 + shipping. You also need a black and white TV monitor to do adjustments. So you see: Owning such a device is not for the fainthearted and the impression you get, when somebody buys something cheap at ebay may be completely misleading. For me the total was about $ 1000. You also see: For an educated engineer a 7912AD is still maintainable. Now i have a scope that dumps its electron beam into a semiconductor target of about 1" by 1". The target serves as realtime storage and is read out by a second beam in three different modes: - TV scanning - xy intensity scanning - xy intensity scanning with analog to digital conversion, storage and data transfer via HPIB. The images i get are perfect, including a grid written by the beam! Bandwith is about 500 MHz. The sampling rate equivalent to the risetime of about 0.6 ns would be 1.6 Gs/s. Now the drawback: it does only about 512 samples total! This is why everybody wants to have one of these modern digital storage scopes with megabytes of memory and why the concept of 7912AD is history. Anyway, for applications where the small number of samples doesn't matter, a 7912AD still competes with modern $ n0 000 scopes. This is in the area of scientific measurements, where you know when you expect an interesting event to happen, so you can catch it inside your 512 samples record. In the world of digital communications a 7912AD gets lost and you better buy a used TDS scope for the same price. Owning such a superb device as a private person may be an interesting experience, especially for a true Tek freak. I bought another one in the meantime.. mmm, because each one has only one input channel! Best regards Dieter Teuchert |
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Re: Digitizer on eBay
Stan or Patricia Griffiths
Lynn,
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If you are talking about the 7912, it is good for making extemely fast, single-shot measurements. Very handy for things like nuclear explosions . . . when you need to catch the EMP on your screen. Is this "Auto-Cal Steering Unit" a Tektronix item? Does it have anything like a Tek part number on it? Is it a rackmounted item with a hinged door on the front? Stan w7ni@... Lynn Lewis wrote: I guess that conversation took place before I joined. Could someone tell |
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Re: Digitizer on eBay
Lynn Lewis
I guess that conversation took place before I joined. Could someone tell
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me - briefly - what the digitizer is good for? And what else would one need to go with it to make it useful? P.S. I recently bought a box called an Auto-Cal Steering Unit. I actually bought it for the box ($5 + S&H) but now that I've looked inside, I find it intriguing. I'm especially curious as to what connects to the two centronics-like connectors on the back. Any background would be appreciated. -----Original Message-----
From: Craig Sawyers [mailto:c.sawyers@...] Sent: Tuesday, January 15, 2002 2:57 AM To: TekScopes@... Subject: [TekScopes] Digitizer on eBay Hi A heads-up for anyone wanting a 7912 digitizer that we were discussing on the list a few days ago. There is one listed on eBay, item 1690813203 with a $19.99 start bid. It weighs 70lb, so it is not one for me - shipping costs to the UK would be astronomical. Craig Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Tek Disease
Stan or Patricia Griffiths
What a Fluke! My wife says "GR . . . GR . . . GR ! I
want you to Packard all this junk up and Hewlett to the landfill! And do it FAST with your Jetronic!" I immediatly came down with a bad case of the Hickoks and screamed, "La Voie! I can't Tek it anymore! Our paths Shallcross no more." There was nothing left to do but Wavetek goodby . . . With apolgies in advance, Stan w7ni@... |
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Re: Tektronix clone (Lavoie LA-265A)
Stan or Patricia Griffiths
"JOSE V. GAVILA (EB5AGV/EC5AAU)" wrote:
Dear Tek friends,Hello Jose, You will find lots of differences between the LaVoie 265 and the Tek 545B. My collection includes a LaVoie LA265A which is very close to a Tek 545A. Apparently, there was an earlier LaVoie LA265 which was a copy of a Tek 545, but I'm not sure about that. Your plan to put comparison pictures on a web page is an excellent one and I will be very interested in looking at it. I like the idea so much that I may do the same one my web site with the other clone scopes as well since I have a Hickock, LaVoie, and Jetronic, too, and many clone plugins as well. BTW, my unit arrived with a late S/N (2xxxx) 'real Tek' 1A1 plug-in. ThisIf your new 1A1 has FET's it will be much better than your old one! As these oscilloscopes are so large, I can't host them in my alreadyYes, you are definitely infected with the "Tek disease" but you can live with it. Like me, you may need to make two large addtions to your shop as the disease progresses. My idea is to build a real classic workbench, using my oldest testWell, Jose, it looks like you have Philips disease and Hickok disease, too . . . So far, I have been able to avoid HP disease but I keep getting exposed to others who have it . . . I will let you know when I build the WEB page depicting all of this. OfStan w7ni@... |
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Tektronix clone (Lavoie LA-265A)
JOSE V. GAVILA (EB5AGV/EC5AAU)
Dear Tek friends,
Yesterday, after an interesting logistics operation (involving a 18 wheel truck, which transported the unit to a meeting point in the middle of a highway), I finally got my LA-265A Tektronix clone. BTW, it has made a large trip, as fist attempt to pick it up las week failed, as route changed, so it went from south Spain (Granada) to south of France (Perpignan), then to Spain again (Madrid), then back to Granada and finally, to Valencia (east of Spain) But, well, it is at last here!. I only own one 500 series oscilloscope, a 545B which I got last summer in a flea market in Marseille (south of France). I was there with my family during a holiday period... but you know Tek-illness goes with you to everywhere ;-)! So I was tempted when somebody offered me that Tek clone... I had read mostly bad things about them (from 'electronic trash' to 'only junk' or 'bad copy') but I was also sure there in Spain there are not too many of them... so I bought it. It came with a partial photocopy of the military manual (TM 33A1-13-97-1) which is also a copy of the Tek manual (!). If you have never seen a Lavoie, well, it is very close to the real Tek, lookwise. Obvious difference is the dark gray painted panel, instead of the classic anodized aluminum. Also, panel border construction is different, as Tek panel is bent in the border but Lavoie panel has a trim piece, probably cheaper to build than the bent panel, I guess. I have not yet opened the unit but hope to do it soon. As I have plenty of 545B pictures, I plan to build a WEB page depicting / comparing both oscilloscopes, so everybody could see the truth of Tek clones ;-) BTW, my unit arrived with a late S/N (2xxxx) 'real Tek' 1A1 plug-in. This is very nice, as I have another 1A1 but of the first series... so now I have both types. Hope this is not so microphonic as my other 1A1 is! As these oscilloscopes are so large, I can't host them in my already crowded shack/repair shop. So I plan to build a new shelf in my recently refurbished garage (which now it is really two small rooms, about 8 sq meters each: a wood working shop and an small garage for my motorcycle and auxiliary electronic workshop). It will host both large oscilloscopes and the extra plugins (now I have only a D and a 1A2... but sure more will come!). My idea is to build a real classic workbench, using my oldest test gear (from a 60s Philips tube generator to a Hickok 600 tube tester, a VTVM and so on). That way I will save some space in my main radio shack / lab and, on another hand, will have an extra workbench to work on large items... but this is another story :-)! I will let you know when I build the WEB page depicting all of this. Of course, if you are curious about the Lavoie specifics, just answer! Best regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: |
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Re: 2 dumb questions
jcastanton
Mathias,
The AM502, 7A22 for 7000 and 5A22N for 5000 look as if they are the same differential amp packaged differently. Many Ebay sellers are unwilling to ship overseas because of the extra paperwork. If European Tek buyers were to establish a US transhipment point through this group, the problem could be solved. --- In TekScopes@y..., "Matthias Urban" <richter_mu@h...> wrote: I am also a newcomer to the community. I bought my first TEK inseptember. I needed a differential amplifier for triboelectric cable noisemeasurements and an oscilloscope for it.I did a quite extensive research about the TM500 series and am now owner ofa TM503 mainframe with an AM502 differential amplifier plug-in and a 10MHz, 2 channel SC503 oscilloscope plug-in. All the components are in mintcondition and I am very happy with my choice. I know that many of you wouldhave chosen the 7A22 differential amplifier with a 7K mainframe for thejob but the dimensions and weight of the 7K Series made me desist from thatthought. The specifications of the AM502 are apparently very similar.prices on e-bay www.vaxxine.com/phil/scopes/plugin$.htm and several shops andcannot share your perception about the TM506. There will always bebargains but generally the condition and the demand of a unit determines itsprice. I could be that the demand for the smaller power supply mainframes isbecause people like me need to do a specific job with this equipment ratherthan putting together as many instruments as possible in one frame.80 MHz (SC504). For ultimate portability there exists the TM515, ahardcase power supply mainframe. Some have high power compartments and forced aircooling. multimeters, etc.) unless you really need an all-in-one solution for field work.this series and I get water in my mouth when I see the e-bay auctions in theUS. Thanks for any hints. Perhaps the european members or people shippingoverseas can give good advise?the 5000 series oscilloscopes with their plugins. The difference between theTM500 and TM5000is the GPIB (IEEE 488.1 - 1987) compatibility. TM5000series frames accept TM 500 and/or TM5000 series plug-ins.December. Now I answers tohave whichTM504'sare probably obvious to you guys but not to me. but$75+S&H)?are paying less than $100 for TM506's (of which I got one for 5000 Seriescan'toscilloscope? If not, then why is the 5000 series so popular? I figure |
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