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2440 for sale
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Bob Albert
I have a nice 2440 for sale. It has been working fine until today, when channel 1 became insensitive. It still works but the attenuation on CH1 is excessive. I have the option of attempting a repair, but frankly my list of projects is already overwhelming.
So make me an offer. I am in Los Angeles. Bob |
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Hi,
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That is the analog bandwidth, you can display repetitive signals in sampling mode. In my practice, I was able to display and trigger up to 700MHz, obviously with much reduced amplitude. So the 300MHz specification is quite conservative, as usual for such vintage test equipment. Szabolcs David Templeton <vexorg.calibra@...> ezt ¨ªrta (id?pont: 2022. m¨¢rc. 21., H, 13:09): It¡¯s a bit odd that quote a 300MHz bandwidth on tekwiki |
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300MHz is likely the equivalent time bandwidth for repetitive signals, whereas the figure below is for single shot
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David -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of David Templeton Sent: 21 March 2022 12:09 To: [email protected] Subject: Re: [TekScopes] 2440 for sale It¡¯s a bit odd that quote a 300MHz bandwidth on tekwiki David On 21 Mar 2022, at 09:22, Roger Evans via groups.io <very_fuzzy_logic@...> wrote: |
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It was very common in the early years of DSOs for the analog signal to be severely under-sampled. I have a late model 2211 which is hybrid analog/digital, has 100MHz analog bandwidth and only 20Msamples/s digitising bandwidth. With my rule of thumb (at least two samples during the pulse rise time) that is no better than 7MHz single shot digital bandwidth, Tek claimed 10MHz. When you first switch the 2211 into digital mode at a fast sweep speed it takes several seconds for the random equivalent time sampling to 'fill in the gaps'. By the standards of the time the 2440 had a very respectable single shot digitising rate.
Roger |
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Bob Albert
My 2440 seems to fall short of specs.? I measure about 290 MHz bandwidth, down 3 dB.
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Bob On Monday, March 21, 2022, 09:14:49 AM PDT, David Templeton <vexorg.calibra@...> wrote:
Yeah, I tend to forget how old they are. I¡¯m just so used to GHz scopes in single shot that I only see the analog bandwidth and assume it¡¯s single shot. David On 21 Mar 2022, at 16:06, Roger Evans via groups.io <very_fuzzy_logic@...> wrote: |
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500Msamples/s
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-----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de David Templeton Enviado el: lunes, 21 de marzo de 2022 7:57 Para: [email protected] Asunto: Re: [TekScopes] 2440 for sale Just curious, what is the single shot bandwidth on that scope? David On 21 Mar 2022, at 06:31, Bob Albert via groups.io <bob91343@...> wrote: |
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The 2440 X-Y bandwidth was 300MHz it says at probe tip, also for the 2439 and 2432/A however the maximum single-event useful storage bandwidth is
200 MHz(2440) 100MHz (2432A) 40MHz (2430A) The 2440 service manual says adjust transient responce for greater than or equal to 310 MHz each channel. Jeff -- Jeffeelcr |
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Bob Albert
My measurements put it at about 290 MHz.? I find the -3 dB display frequency, repetitive signal.
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Bob On Tuesday, March 22, 2022, 06:47:24 PM PDT, jeff_a_bowman@... <jeff_a_bowman@...> wrote:
The 2440 X-Y bandwidth was 300MHz it says at probe tip, also for the 2439 and 2432/A? however the maximum single-event useful storage bandwidth is 200 MHz(2440)? 100MHz (2432A)? 40MHz (2430A)? The 2440 service manual says adjust transient responce for greater than or equal to 310 MHz each channel. Jeff -- Jeffeelcr |
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Bob, just wondering what has been done to that scope? Is it still giving problem in one channel?
Asking because I have 3 2440's, 2 2432's, 1 2432A and a few 2430A,s all waiting on parts to repair and calibrate, so in a few months I will find out myself what these series scopes can do (or what else is wrong with them?) Jeff -- Jeffeelcr |
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Bob Albert
Jeff, the guy I bought it from said that mostly he replaced electrolytic capacitors.? I haven't done anything to it.? The reason I decided not to sell it is that I was mistaken about the bad channet.? It works okay I think.
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I don't like the scope that much.? I have another one that needs work and it seems as though Tek didn't go the extra mile in engineering; the boards are stacked in an effort to keep the unit small and the hardware isn't standard. As for using it, well it has some benefits and some drawbacks as one might expect.? It's not that user friendly and one needs to use it often to remember what menu to use for what function.? I find myself staring at the panel to figure out how to perform some mundane procedure.? Like shutting off the display of some function or changing how many traces on the screen. The bottom line is that I use my 2445 for most work and my HP54542A is easier to handle. Bob On Wednesday, March 23, 2022, 04:26:58 AM PDT, jeff_a_bowman@... <jeff_a_bowman@...> wrote:
Bob, just wondering what has been done to that scope?? Is it still giving problem in one channel? Asking because I have 3 2440's, 2 2432's, 1 2432A and a few 2430A,s all waiting on parts to repair and calibrate, so in a few months I will find out myself what these series scopes can do (or what else is wrong with them?) Jeff? -- Jeffeelcr |
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Bob, yes I agree it is a complicated scope, the 2440 is my high end scope with options 05 and 11 for almost everything else I use a 2225.
What I have found out is every electrolytic in the power supply should be changed along with 4 Rifa manufactured safety caps. I will not use anything but Matsushita/ Panasonic 105 deg in anything I work on, remember this is an old scope and for a DSO of its time easier to use than most were. Hope you continue to use it. Now, if I can just remember which button to push when? Jeff -- Jeffeelcr |
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Hi,
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Yeah, the 2440 is a complicated instrument, but has quite some features considering its age (such as 500MSa/s sampling, or 2ns glitch capture). However, one thing that I consider an advantage is that it basically has the same features and controls as an analog scope, including delayed timebase.Of course, deep memory on a modern scope is much better that fiddling with delayed trigger, but still. For the buttons, one should not forget that this instrument seems to have been targeted at automated testing, hence it has a lot of functions, like the auto sequence setup, that is marginally useful for the average electronics hobby lab. Having said all this, I really like this scope, I have the 2402a tekmate for it, so I can even do FFT (well, sort of...). For the warm and fuzzy analog feeling I use my 5400 with the huge crisp screen and a bunch of plugins. Szabolcs jeff_a_bowman@... <jeff_a_bowman@...> ezt ¨ªrta (id?pont: 2022. m¨¢rc. 24., Cs, 12:25): Bob, yes I agree it is a complicated scope, the 2440 is my high end scope |
David C. Partridge
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