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Re: Getting really, really tired of...
Peter Gottlieb <hpnpilot@...>
The name, trademarks, or taglines of businesses seldom tell you anything about the quality or capabilities of them. To the contrary, I have seen many cases where such were quite misleading. A couple of examples:
"Storage Pros" The only thing "professional" is that storage is their profession. No mistaking anything professional in their manner about how they do anything at all. "PayPal - America's most loved payment system" Most popular on Ebay, to be sure, especially after they were bought by Ebay and Ebay made it very difficult to use any other payment option. But if you look at the complaints, and their skirting of banking and consumer protection rules and laws, it is a big stretch to call themselves the most loved. At this point whenever I see something in a name like that I am extra suspicious and my due diligence becomes much more thorough. Jul 6, 2011 11:06:58 AM, TekScopes@... wrote: You would think someone calling themselves megasupersurplussales would have plenty of boxes laying around. All shapes and sizes, too. chris
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Re: Getting really, really tired of...
Chris Moore <chris2phermoore@...>
--- On Wed, 7/6/11, tmillermdems <tmiller@...> wrote:
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Tek TX3 DMM cal?
Anyone familiar with the TX3 DMM? The service manual says there are no internal cal adjustments. Does this mean something like cal values are written to EPROM at the factory?
If so, that makes getting a used one a lot less attractive... thx Michael
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Re: Tek P7001 Processor
GK <ghm1@...>
Albert
I will get an extension board for the P7001 at the
end of this week, so it will be easier, to check the P7001 boards.
Another question is: Can you help me with a Tek
custom IC 155-0068-00 for the output amplifier of my 7A19.
Gerhard
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Re: 2465B quirks
bosmanskurt <kurt@...>
Hi Again,
toggle quoted messageShow quoted text
I took some pictures to illustrate my previous questions. In this first picture you can see the 100MHz square wave at 100mV/div: Now I switch the scope to 50mV/div, notice how the shape of the wave changes: Next a couple of pictures that illustrate the trace creeping to the right at faster sweep speeds: Anyone have any idea what might explain this? Kind regards, Kurt
--- In TekScopes@..., Kurt Bosmans wrote:
> > Hi All, > > I recently obtained a 2465B oscilloscope from ebay. I have no prior experience with this type of scope so I hope someone can help me out with a couple of questions. I noticed some peculiarities and was wondering if they are normal or indicative of some fault. > > The first peculiarity I noticed is that when I switch to faster sweep speeds the start of trace seems to creep to the right. In the fastest sweep speed I have to put the horizontal control almost all the way to one side to have the trace start at the left edge of the screen. The faster the sweep speed the more the trace shifts to the right. > > The second peculiarity has to do with the vertical sensitivity and frequency response. I built a simple 100MHz square wave generator as described in Linear Tech application note 98 by the late Jim Wiliams (figure 8). The output of this generator is fed into the input of the scope set to 50 ohms. The generated signal is about 200mV peak to peak. When I view the signal in the 100mV/div setting it looks exactly like what I expected: a more or less decent square wave with a little "overshoot" at the starting edge due to the limited bandwidth of the scope. However when I then switch to the 50mV/div scale the shape of the wave changes drastically. The top and bottom of the wave now show a pronounced 500MHz (5th harmonic) oscillation. What could be the reason for this? I read that the bandwidth of the scope is limited to 350MHz for the highest sensitivity setting (2mV/div), but I can't find anything that would apply to the 100mV/div-> 50mV/div transition. > > The third thing I noticed is that the trace becomes markedly more "fuzzy" when you switch on the times ten magnification. Comparing the same sweep speed as obtained with and without the magnification it seems there is some kind of jitter present on the triggering when the magnification is engaged. In effect the up and down going flanks of the square wave become much wider. Is this an artifact of the times ten magnification? > > Best regards, > Kurt >
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Re: 155-0012 Z Axis Logic Tek IC - any sellers?
Albert <aodiversen@...>
(continued)
toggle quoted messageShow quoted text
Off-list said "not able to..." and my typing work disappeared! Several times. Maybe later. Albert
Hi Magnus,
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Re: Getting really, really tired of...
Gary Mizener
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Re: 155-0012 Z Axis Logic Tek IC - any sellers?
Albert <aodiversen@...>
Hi Magnus,
toggle quoted messageShow quoted text
Thought this was solved already so I didn't respond to your previous request. I could help [if you have a big wallet :=)], will contact you off-line. Albert
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Re: Novel 7000 series shipping box
Gary Mizener
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Screw Cap for Fuse Holder to fit 7000 Series
One of the 7834s in my "to be fixed" pile is missing the screw cap for the fuse holder - I don't think it is unique to the 7834, though some 7834s and other 7000 series have "half turn" caps for the fuse holder which this isn't.
Does anyone have a suitable spare? Thanks Dave
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Re: Transformer specs
Mike <mikez11@...>
In the old 6-digit system the 545B took a 120-344 PT so that's likely correct. The 545B service manual (free on bama) shows 5 power and 7 filament secondaries. You'd probably have to guesstimate current ratings from the schematic.
toggle quoted messageShow quoted text
mike
--- In TekScopes@..., Glenn Little WB4UIV <glennmaillist@...> wrote:
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Novel 7000 series shipping box
Artekmedia <manuals@...>
I was doing some remodeling ( upstairs bathroom ) which among other things entailed purchasing a toilet. As I was cleaning up it struck me that the box the heavy porcelain fixture came in was just about right size to ship a 7000 series scope main frame. After measuring the box and a 7904 it seems that the box is 4-5 inches bigger than the scope in all dimensions leaving enough room for adequate padding. The box it self is double wall cardboard (because of the weight of it's prior contents and has two strategically placed hand grips on either end to facilitate carrying by your favorite packing service.
Moral to the story if you or a friend are replacing a toilet don't throw away that box! Dave -- Dave& Lynn Henderson Manuals@... www.Artekmedia.com PO Box 175 Welch,MN 55089
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Re: Getting really, really tired of...
Gala Dragos
Give them negative feedback ! Even if you specify how you want the item to be shipped they will not comply. I always have to pay extra for shipping, especially if the item is over 2 kgs.
From: DaveC To: TekScopes@... Sent: Wednesday, July 6, 2011 9:26 AM Subject: Re: [TekScopes] Getting really, really tired of... Tom,
Of course you'll apply to e-Bay for a refund or reduction in price... Dave -=-=-=- >Ebay sellers that stick a 475A scope in a box that is too small. In >this last case, it was smaller than the scope and the knobs were >poking through the cardboard. Both trigger and slope knobs bent 60 >degrees, shafts snapped, knobs broken. Var vert gain (ch-2)pushed in >and broke the control mounted on the board. > >Other than that, the scope was perfect and very clean. Just had a >shorted cap on the -8 volt supply. > >FWIW, > >Seller: >megasupersurplussales > >If you buy from them, be sure to specify how you want it shipped. > >Very unhappy and needing to rant a bit, >Tom
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Re: Getting really, really tired of...
DaveC <davec2468@...>
Tom,
toggle quoted messageShow quoted text
Of course you'll apply to e-Bay for a refund or reduction in price... Dave -=-=-=-
Ebay sellers that stick a 475A scope in a box that is too small. In this last case, it was smaller than the scope and the knobs were poking through the cardboard. Both trigger and slope knobs bent 60 degrees, shafts snapped, knobs broken. Var vert gain (ch-2)pushed in and broke the control mounted on the board.
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Re: Tek 2445b and 2467 Issues
Tom Miller <tmiller@...>
Hello Geoff,
Always the first thing to do is get a manual for the scope. I recommend
emailing Dave at manuals@... giving the
model and serial number of each unit. He can put up a pdf that you can download
or you can get a CD sent to you. The price is right and the quality is
unmatched.
Then, measure the power supply voltages and the ripple as stated in the
servicing (adjustments) section of the manual. You must get the power
supply running correctly before anything else.
The 2445B has a control board (A5) that in some versions has some surface
mount capacitors known to leak electrolyte and damage parts and track. If you
have one of these, it will have four surface mount electrolytic caps that must
be looked at for the leaking.
Then you go from there.
Sure someone would give me a 2445B and a 2467. :).
Anyway,
good luck,
Tom M
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Tek 2445b and 2467 Issues
GeoffM
I was given two scopes. A 2445b and a 2467.
However, they don't work. I've been trying to figure out what's wrong but I need some help. Both of them power up, run the testing, then fail at something so I press "A/B Menu" and they go into operating mode. The strange part is there is nothing legible on either screen. It is just static. Fiddling with the controls however does cause the screen to change somewhat. For example, after I power one up and press the "Auto" button. Doing that then adjusting the time base does cause the static to sweep across the screen. Another example would be the "Beam Find." Pressing this causes the static to shrink slightly. Anyone know what is wrong? I am fine with using one as a parts unit. (preferably the 2467 due to its display size.) Thanks, -Geoff
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Re: Getting really, really tired of...
teamlarryohio
I recently did a repair estimate on a pair of shipping-damaged
toggle quoted messageShow quoted text
McIntosh amps. Mr. Forklift won. I nearly cried. They were otherwise drop-dead gorgeous. -ls- "tmillermdems" <tmiller@...> wrote:
Ebay sellers that stick a 475A scope in a box that is too small. In
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Getting really, really tired of...
tmillermdems <tmiller@...>
Ebay sellers that stick a 475A scope in a box that is too small. In this last case, it was smaller than the scope and the knobs were poking through the cardboard. Both trigger and slope knobs bent 60 degrees, shafts snapped, knobs broken. Var vert gain (ch-2)pushed in and broke the control mounted on the board.
Other than that, the scope was perfect and very clean. Just had a shorted cap on the -8 volt supply. FWIW, Seller: megasupersurplussales If you buy from them, be sure to specify how you want it shipped. Very unhappy and needing to rant a bit, Tom
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Transformer specs
Glenn Little
While cleaning the shop, I uncovered a Tektronix power transformer.
This is marked 120-0344-00. First indications are that this is from a 545B. Can anyone verify this and possibly provide voltages and currents? Thank you 73 Glenn WB4UIV
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Service manual with schematics (or schematic section) for TAS465/475/485
Sam Reaves
Does anyone know where I can find a service manual with schematics
for the TAS series? I have a manual for the TAS485 but it is missing the entire schematics section. Thanks, Sam W3OHM
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