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Tek Probe Question
All,
I'd like to buy some used Tek probes for use with the higher bandwidth 7000 series plug-ins (I'm thinking 7A19, 7A29, 7B10, 7B92A). I am looking at a Tek P6139A and decided to download the spec sheet from Tektronix to see the particulars of this probe. It is a 500 MHz probe, but the datasheet calls out: 500 MHz (TDS3054) or TDS500 series 100 MHz (TDS3012) Now, I understand about passive probe compensation and all that. What I don't understand is what the 'scope-dependent bandwidth spec means. will this type of probe be useful close to 500 MHz when used with the >= 600 MHz BW 700 vertical amplifiers (e.g., response close to 500 MHz), or is there some probe/'scope dependency of which I am not familiar? I have several P6106s which I am currently using. Thanks. Cheers, Dave |
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Re: Sources for shipping cartons for vintage Tek scopes?
--- In TekScopes@..., "keithostertag" wrote:
Keith, In addition to the numerous suggestions offered for packaging filler, I will add a tip that I found very effective. Quite often during shipping the knobs on a heavy scope become broken as the scope shifts around in its package. Although they are lighter instruments than 500 series, I found 7000 series scopes are more susceptible to this damage, as the knob shells are thinner. I find a scrap cardboard box that has a bottom dimension as close as possible to the front panel height and width of the scope. I then cut the sides of the box about 8 cm (3 inches) from the bottom of the box. If the box dimensions exceed the size of the scope, I trim the corners on two sides. Leaving one corner intact. I then fold the box bottom to snuggly fit the front of the scope, keeping the bottom a few cm away from the end of the knobs. It may be necessary to trim cutouts for the feet in the front of the scope. I then tape the sides of the box to the sides of the scope with packing tape, on all four sides (top, bottom and both sides). I have found that this technique is effective in preventing the knobs from being damaged during shipment. Instruments with isolated knobs, switches or BNC connectors on the rear can protect these with a simple piece of cardboard, folded in a V shape and securely taped to the rear panel. Steve |
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Re: DC Loads for Testing 2465B and 7000 Series SMPS
Hi Albert,
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I have a couple of 7603 rectifiers laying around that have good unregulated outputs very similar to the 7704A unregulated voltages. I will not have a 7603 connected. The connection will be from the 7603 output connectors to the 7704a low voltage regulator board to a min load fixture. No mainframes involved. I may power the 7603 rectifier with a variac if needed. I only have one bad 7704a power supply left. The others have been fixed and are running so I am not in a big hurry. I have plenty of cables to make the connections. Jerry Massengale
-----Original Message----- From: Albert To: TekScopes Sent: Tue, Feb 12, 2013 12:17 pm Subject: [TekScopes] Re: DC Loads for Testing 2465B and 7000 Series SMPS
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Hi Jerry,
Nice idea to feed the LV board with another power supply. You plan to use the rectifier outputs from a 7603 so you probably mean the unregulated outputs. Then the 7603 has no protection. I would use the regulated 7603 outputs. That requires slight modifications in divider chains in order to increase all regulated outputs by a few volts. I think there is still enough voltage difference between unreg and reg then to prevent drop-out. (For a first test the LV board under test doesn't need heavy loads, so the unreg voltages can remain quite high.) The 7704A display unit (HV, vert and hor amp) can be replaced by about 11 W load at the 54 V square wave (see message #48756). I'm not sure whether the 7704A PS should work then or that still some plugin load is needed. Albert --- In TekScopes@..., jerry massengale wrote: > > Hi, > > I recently used Alberts load value to build a load for 3 7704a power supplies that were not working. I added a 3k load for the hv drive lines. I found that one of the power supplies would not start reliably with that load but started easily in it's 7704A. > > I am building a prototype 7k extender with a switchable 47watt load. My plan is that it can be used in a mainframe with not plug ins or just the Aquistion (bottom half) of a 7704A. I am hoping that it will work with the non plug in loads to insure start up. > > I was planning to try and use a 7603 rectifier to build a test bed for the lv regulator of the 7704a as it has input voltages for the regulator that do not cycle off. > > When troubleshooting a switching power supply, it is helpful to use any tricks you can find. > > On 7704a power supplies i found it helpful to drive the power supply with a variac. At about 70vac in the supply starts ticking and you can use a scope to see how the secondaries are doing. You look for voltage pulses that proportionally higher or lower than the others. For example pulses on the -50V of -40v with 5v pulses on the +50v line suggest a problem on the +50v circuit. > > Dave on some others have a far better understanding of the controller ic in these supplies than I do. > > > > > > Jerry Massengale > > > > > > > -----Original Message----- > From: Albert > To: TekScopes > Sent: Tue, Feb 12, 2013 5:42 am > Subject: [TekScopes] Re: DC Loads for Testing 2465B and 7000 Series SMPS > > > > > > Hi Charlie, > > In addition also have a look in the thread of message #83499. > > Albert > |
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PYRAMID CALIBRATOR AND TESTER FOR TEKTRONIX OSCILLOSCOPES
To all Forum Members:
Many forum members have expressed interest in the Pyramid Generator and, as promised in the eBay ad, I have sent out numerous copies of the manual. I have confidence in the design, usefulness and reliability of this product so, I am offering to send one to any forum member on a no penalty approval basis. The approval period would be 10 days after receipt. All I ask is that it not be handled roughly, that the buyer pay shipping both ways and the buyer, if returned, send $2 for a new battery. The approval buyer will send me $158.83 via PayPal or check and I will send one immediately. Absolutely no questions asked if return selected. Return deposit sent in same manner as received. Reed Dickinson 1705 Stonehenge Drive Tustin, CA 92780 714 838 6241 reed714@... |
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Re: PYRAMID CALIBRATOR AND TESTER FOR TEKTRONIX OSCILLOSCOPES
¿ªÔÆÌåÓýHi Jerry:I used the same PCB layout software to do the front panel.? It is TraxMaker.? All the dimensions for the PCB were in the software so why not use it for the front panel as well.? I was pleased with the outcome.? The only real problem was getting the 12 positions angled properly.? I will include a .pcb for the PG. Reed On 2/12/2013 6:15 AM, jerry massengale
wrote:
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Re: DC Loads for Testing 2465B and 7000 Series SMPS
Albert
Hi Jerry,
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Nice idea to feed the LV board with another power supply. You plan to use the rectifier outputs from a 7603 so you probably mean the unregulated outputs. Then the 7603 has no protection. I would use the regulated 7603 outputs. That requires slight modifications in divider chains in order to increase all regulated outputs by a few volts. I think there is still enough voltage difference between unreg and reg then to prevent drop-out. (For a first test the LV board under test doesn't need heavy loads, so the unreg voltages can remain quite high.) The 7704A display unit (HV, vert and hor amp) can be replaced by about 11 W load at the 54 V square wave (see message #48756). I'm not sure whether the 7704A PS should work then or that still some plugin load is needed. Albert --- In TekScopes@..., jerry massengale wrote:
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Re: plastic binders for Tek instruction manuals
Artekmedia
¿ªÔÆÌåÓýWhen I get time ( yeah right !) I will do a photo tutorial of how to do this without the machine small manual can be done in less than 1 minute by hand a large manual takes 2 minutes worst caseDave ArtekManuals On 2/12/2013 10:13 AM, Jim Reese wrote: ? -- Dave Henderson Manuals@... PO Box 175 Welch,MN 55089 651-269-4265 |
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Re: Sources for shipping cartons for vintage Tek scopes?
Lowes (it could be home depot, but I think it was lowes) has reallyBoth of them sell very similar moving boxes, but no shipping boxes. They are definitely not strong enough to hold a scope (if single boxed). They have only a few sizes. (If you are using them for moving or storage, I think the Lowe's boxes are better, because they have hand holes punched out.) |
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Re: plastic binders for Tek instruction manuals
¿ªÔÆÌåÓýThanks to all for the comprehensive, and very useful
responses.
I was searching for 'spiral' binders - wrong. Should have been
'comb' binders
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As my old Ma used to say; asking the right question materially
improves the chance of getting the right answer!
Thanks again
Chris HJ ?
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Re: Sources for shipping cartons for vintage Tek scopes?
Spray foam seems expensive for this task. But there are packaging
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services with proper two part foam generators, specifically for packaging. I think that foam is more dense and there will be no curing issues. Still, the corners and other bits would need good reinforcement for anything as heavy as a 500. In some cases it would be well worth paying to have the entire box interior foamed - good packing of odd objects can take so much time. Lowes (it could be home depot, but I think it was lowes) has really inexpensive shipping boxes. Much less expensive than U-haul, etc. You can double box to increase strength. Ron On 2/10/13, Robert <go_boating_fast@...> wrote:
Bag the peanuts in leftover grocery store bags. That will help them stay in |
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Re: plastic binders for Tek instruction manuals
Just go into Staples - they have the binding machines and plastic bindings in any size up to about 4".
The charge about a fiver (or less) to rebind a manual IIRC Regards, David Partridge ________________________________ From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Christopher Hilton-Johnson Sent: 12 February 2013 16:02 To: TekScopes@... Subject: [TekScopes] plastic binders for Tek instruction manuals white plastic spiral binders |
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Re: plastic binders for Tek instruction manuals
These are widely referred to as "GBC" binder combs. The machines to punch the 19 holes and to install the binder combs are often seen on eBay. There are both manual and electric powered machines available; obviously, the manual machines are much less expensive.
Stationery stores such as Office Depot and Staples sell both the machines and the binder combs. It is possible to install the combs without a machine, but it can be exasperating... It is wise to buy a larger diameter comb than originally used as the pages will turn more easily and lay flat more readily--and be easier to install without a machine. Kinko's--now FedExpress Office--can punch the holes and install the combs. Larry On 2/12/2013 8:18 AM, Dave Daniel wrote: Yes, I just copied an old Heathkit HW-20 manual by removing the comb and... -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland) |
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Re: plastic binders for Tek instruction manuals
The binding machines that I have used are big and heavy. For me it wouldn't be practical to own one. I think the copy shop (Kinko's or other) is the best approach to fixing your binding. Don't know about the colors they stock.
Another approach, if you are OK with deviating from the stock look is to buy one of the special ring binders that have multiple oblong rings that exactly fit the hole pattern used for plastic spines. Cheers, Tom |
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Re: Bonehead move of the day
Well, I replaced some broken binding posts on a DM502 yesterday. I took the entire front panel apart so I could glue the plastic bedding part together, since it was cracked (you know, "as long as you're in there"). I re-assembled everything, including new binding posts, and was about to re-solder the binding post connections and probe power connector when I noticed I had the extraction tab in wrong.
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A couple of hours later, after my disgust had evaporated, I disassembled everything again, reset the extractor assembly, and re-assembled the front panel. Dave On 2/12/2013 9:08 AM, Mark Wendt wrote:
Troubleshooting a bouncing trace on an SC502. Narrowed it down to the |
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Re: plastic binders for Tek instruction manuals
Artekmedia
¿ªÔÆÌåÓýChrisEvil Bay has lots of em ...but most office supply places carry them....the larger ones (1" to 2" or 3cm to 6cm)? are a little harder to find ...call ahead If you know the secret ( contact me off list) they are not that hard to replace without the machine..Personally though the ones for my own use? here in the shop that get that way ...I three hole punch and put in a 3 ring binder.. Easier to take a page out when I am working in the shop FYI Dave ArtekManuals On 2/12/2013 10:01 AM, Christopher Hilton-Johnson wrote: ? -- Dave Henderson Manuals@... PO Box 175 Welch,MN 55089 651-269-4265 |
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Re: plastic binders for Tek instruction manuals
¿ªÔÆÌåÓýYes, I just copied an old Heathkit HW-20 manual by removing the comb and copying the manual and the fold-outs page-by-page. Re-assembling the manual took a long time because the pages were somewhat brittle and i didn't want to rip the comb holes open. It helps tremendously to line up the comb holes as perfectly as possible with some sort of took and then clamp the pages together with spring paper clamps. I probably wouldn't have had the patience to do that twenty years ago.Any idea what the perf/assembly machines go for on the used market? Dave On 2/12/2013 9:13 AM, Jim Reese wrote:
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Re: San Mateo 7000-series Storage Scope
Ok, I see Lyle is getting it.
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--- In TekScopes@..., "Robert" wrote:
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David C. Partridge
Tom Phillips
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