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Re: TM 504 Power Module Questions
I think you got that backwards Pins 1 thru 13 (bottom) are all the same Pins 14 thru 28 (upper) are mostly custom select as per units allow. Don't forget side A and B looking from the front A is on the right B is on the left of each connector on the TM500 series.
Jeff |
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Re: Paper Used in Older Tek Manuals
Dave Henderson of Artek manuals posted awhile back showing how to replace a comb binding.
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DaveD On Jul 25, 2021, at 14:01, Dave Daniel via groups.io <kc0wjn@...> wrote: |
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Re: Paper Used in Older Tek Manuals
I bought a bunch of black and white combs and a small-capacity comb punch a while back. I used it to replace many crumbling Tektronix manual combs, as well as binding various other documents (such as Jim Williams¡¯ Linear Technology AN-47 which is ridiculously long and ridiculously useful). I have a bunch of clear front covers and black rear covers from Kinkos that I use for covers.
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DaveD On Jul 25, 2021, at 13:44, rick <rickc@...> wrote: |
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Re: Paper Used in Older Tek Manuals
Years ago (2006), I found a comb binder on ebay. It was about $112. Did not include supplies, which are easy to get.
the trade name was Ibimatic, which is a brand of Ibico. It's handy to have. I don't know if I use it enough, but unless I want to go to my copy/print place and pay them, there's no other way. It's also handy for disassembling an existing "book" so you can copy a page, etc. Then, when reassembling, there is no equal. You can buy covers for your "reports" but they are not the same stock, and not Tektronix blue. It sounds like you are pretty OCD about this. --rick chinn |
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Re: SG503 question
I can check the 2 of mine if that would help. I would suspect that they are close to spec if not in spec. I am curious if the 2 where the output is falling off are early serial numbers and the one you have the keeps going is a later serial number. Transistors in this era improved dramatically in quality and function. Now that I think about it I have no idea what my serial number is on the unit I have.
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Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of romeo987 Sent: Saturday, July 24, 2021 9:23 PM To: [email protected] Subject: Re: [TekScopes] SG503 question Zen, Thanks for your reply. Table 3-3 of the manual suggests typical LF limits of 4.70 and 9.09 MHz on the two ranges in question. My units get very close to, or past, these values before the output dies, so it may well be typical. A third unit I have just keeps going to the physical low frequency limit of the tuning knob. So I am not greatly concerned¡but I was simply curious to know whether other users of these see the same thing. In my (albeit limited, compared with many on this board) experience of Tek stuff of this vintage, the designs were usually not so marginal. And no, I don¡¯t propose to fiddle the tuning slugs: the limited SA capability I have suggests that the units are within, or very close to, spec. We find many things to play with when we are sitting in COVID lock-down! Roman |
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Re: SG503 question
Zen,
Thanks for your reply. Table 3-3 of the manual suggests typical LF limits of 4.70 and 9.09 MHz on the two ranges in question. My units get very close to, or past, these values before the output dies, so it may well be typical. A third unit I have just keeps going to the physical low frequency limit of the tuning knob. So I am not greatly concerned¡but I was simply curious to know whether other users of these see the same thing. In my (albeit limited, compared with many on this board) experience of Tek stuff of this vintage, the designs were usually not so marginal. And no, I don¡¯t propose to fiddle the tuning slugs: the limited SA capability I have suggests that the units are within, or very close to, spec. We find many things to play with when we are sitting in COVID lock-down! Roman |
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Ballantine Calibrator manual
Fellow Tekkies,
You find the darndest things when you're cleaning up. In this case, it was a clean reproduction of the operating and service manuals for the Ballantine Labs 6127B O-Scope calibrator. I've scanned it into PDF form, and am in the process of cleaning it up, organizing the pages, etc. Once that's done, I'll post it to the group's file area and make it available on my archive (and KO4BB's, of course). You're welcome. ;-) -- --- Bruce Lane, ARS KC7GR kyrrin (at) bluefeathertech dot com "Quando Omni Flunkus Moritati" (Red Green) |
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Re: Advice on fixing 2465B slow horiz sweep
Sorry that I haven¡¯t been following this thread closely, so forgive me if you¡¯ve already explicitly verified that the vertical calibration has not been affected. But if the vertical gain is off by the same amount as the horizontal, though, that would point to a HV problem (in this case, a reduction).
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Cheers Tom Sent from my iThing, so please forgive typos and brevity. On Jul 24, 2021, at 9:57 AM, Grayson Evans <wa4gvm@...> wrote: |
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Re: Paper Used in Older Tek Manuals
Thank you Toby and Ken for making those measurements. I have several reams of paper on order (28 lb and 32 lb because, as you say, heavier feels better). At the moment I'm using a blue 1/2 inch 3-ring binder for this manual, but I do intend to look into comb binding and good cover stock.
The covers used by Tek were 9x11 inches, and the paper has what feels like a plastic coating. For a one-off job I can cut the window by hand, but I'm considering a run of covers from a print shop that would do die cutting of the front cover window, and silver ink printing. -- Jeff Dutky |
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Re: Paper Used in Older Tek Manuals
On 2021-07-24 1:04 a.m., ken chalfant wrote:
Greetings,FWIW, I weighed 10 pages of a Tek 515A manual, I got approx 107 gsm -- approx 405 gsm for the blue covers. Of course heavier always feels better (I would try at least 120 gsm equivalent). --Toby On 23Jul, 2021, at 7:26 PM, Jeff Dutky <jeff.dutky@...> wrote: |
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Re: Advice on fixing 2465B slow horiz sweep
On Thu, Jul 22, 2021 at 03:02 PM, Grayson Evans wrote:
------- There are good suggestions in the other posts too. Given that delta-T measurement has the same wrong horizontal scale factor, horizontal gain could be an issue as you suspected, although it is strange that the gain is off by ~ 5% (0.5cm error in ~ 10cm). One more test to check horizontal gain is to apply a signal, e.g. 1kHz sine wave, with 8 division amplitude to channel 1. Then switch to X-Y mode with nothing connected to Ch2, and with only Ch2 selected in the mode switches. Do you see a 8 division horizontal line, or is it compressed too? If you now turn on Ch1, do you see a 45 degree diagonal line? I did this experiment on my 2467B (almost same as 2465B). You can also use the calibrator output as signal generator, then you will see two dots in X-Y mode. You will need to adjust Ch1 volts/div for 8 divisions amplitude or best measurement accuracy. Looking at the schematic there is some interaction between x10 gain and x1 gain pots, if you see the gain off in x10 mode it could still be R860. If you touch R860 you may want to mark the original position in case it is something else. Again 5% error all of a sudden is strange. Ozan |
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Re: Advice on fixing 2465B slow horiz sweep
Hey Grayson,
It'd be helpful if you could describe what you've done and seen in some detail. Detailed observations are vastly more likely to produce useful advice than writing up your conclusions. Inline... Siggi On Sat, Jul 24, 2021 at 12:57 PM Grayson Evans <wa4gvm@...> wrote: I suspect horizontal gain drift since that fits the symptoms and I don'tLike I said, if you have the *same exact* offset at *all* sweep speeds, and on the cursors, then this could plausibly be horizontal gain. From what I can see, the 1X and 10X CRT gain are adjusted separately, so you can further verify that it's the 1X gain that's out if the sweep is OK at 10X. This is a case where you can describe what you've done and what you've observed in order to get better advice. The horizontal gain is adjusted first in the CAL01 procedure with R860 (1X) and R850(10X). Note that the sweep speeds are under software control through control voltages from the DAC on the A5 board. These are adjusted throughout the rest of the CAL01 procedure. I replace all the electrolytics in the power supply and everywhere else I Do you have surface mount electrolytic caps on your A5 board? Had they leaked? |
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Re: Advice on fixing 2465B slow horiz sweep
I suspect horizontal gain drift since that fits the symptoms and I don't know of any other problem.
I replace all the electrolytics in the power supply and everywhere else I could find one. Just not sure if the horiz. gain is adjusted using a pot, (R860) or in the confusing CAL 01 procedure. Anyone done that procedure? |
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Re: New (old) 2247a enquiry
If nothing else, sounds like you need to perform the trace rotation which is a screw trim adjustment which can be accessed from the front panel between the Focus and Readout control knobs just under the CRT face. That adjustment should allow you to get the trace even with the "horizon". If there is also any "bowing" on the trace you might need to perform the Geometry adjustment first, which as far as I remember is inside the scope. I don't have the SM manual handy so best you take a look into it. Manual is available here:
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Re: AA 501A Parts, DM 501A Probes
Amphenol If they have the cable you need. Tend to be a little on the pricy side. $20 for a longish BNC but one of the top shelf brands before you get in to the exotic high frequency cables and interconnects. Mouser and Digikey should stock them. For banana do you need shielding?. I make my own with meter lead so they are SUPER flexible. Unless I need shielding then I need to look at other wire.
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Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of sweetbeats Sent: Friday, July 23, 2021 3:21 PM To: [email protected] Subject: Re: [TekScopes] AA 501A Parts, DM 501A Probes So, a *sort* of related question, can anybody recommend a ¡°can¡¯t go wrong¡± set of female BNC to female BBC patch cables as well as banana to banana patch cables? Cory Oace |
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Re: SG503 question
When the output falls is the frequency outside the selected range? I have one that will let me set the frequency quite a bit low and high on the selected range but the leveling is not specified outside the selected range frequency range So this might be "normal" behavior. I just did a full calibration on one of the units I have. The manual calls out NOT to adjust the coils or trimmers unless necessary. And if those need adjustment you will need a spectrum analyzer to get the adjustment correct as these have a great deal of effect on the harmonic content of the waveform.
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Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of romeo987 Sent: Saturday, July 24, 2021 4:59 AM To: [email protected] Subject: [TekScopes] SG503 question Guys, Apologies in advance if I am doing the wrong thing; I posted this question on the TM500 group a while back, but there seems to be little activity over there, while there is a lot of action here ( I have been following for quite a while), and a lot of it to do with the TM500 world. The question is as follows: I have a couple of SG503s that I decided recently to ¡°get working¡±. Largely successful to the extent that I can monitor the output level to the required accuracy without the special Knick knacks called out in the manual. But one interesting effect I notice on both units (to a greater extent on one than the other) is, that on the 5-10 and 10-20 MHz ranges, at the extreme low limit of the dial (below 5 and 10MHz respectively) the output falls away to zero. Only on these two ranges. I have spent a bit of time rummaging around in the circuit, and at the moment it looks as if Q300 (the current source for the oscillator, driven by the leveling amp) can¡¯t quite push enough current to keep the oscillator Q130 going. But before I spend a lot more time, I would like to hear whether this is a common effect, and whether there is a known solution. Any advice gratefully received . |
Bruce Lane
Mlynch001
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