Re: Tektronix 2467B good buy?
Analog scopes also have dead time - sweep(stroke) retrace.
All other you say its no problem to view with long memory, high sampling rate, analog persistance DSO.
For critical use maybe the best will be iwatsu analog storagescopes such as TS-81000, lecroy lc354, but sadly I dont work with it :(
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Deal,
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Roger Evans via Groups.Io Sent: 04 October 2018 12:02 To: [email protected]Subject: Re: [TekScopes] Free to a good home Robin, This may sound gross but I have a near mint 7704A that I bought for less than the value of the 7T11 sampling timebase that came with it. Since it is the only one of my 7000 frames that splits in half it is the only one that can go in the attic for storage. What I was suggesting is a straight swap of my 7603 for your 7623A, that way we both have one in - one out! Regards, Roger
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Hey John, Do you know if the focal distance etc is similar to 3X reading glasses? I don't use readers, have bifocals, but focal distance seems much closer. Maybe 3-4 inches (8-10 cm). And is it the flip up ability what makes that style work for you? Both the flip up and the built-in light are wonderful. Regards, Dennis
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Recently when working on a Yaesu FT-857D that got a power spike, I had a number of really tiny parts to replace, and I mean tiny! Both of these are diodes, the smaller one was in the 857, they use engraved lines to indicate the cathode. My SMD pickup tool that uses vacuum ate
one of 'em.
I suspended one of these above the board so I could watch what I was doing on my 24" computer monitor. Of course doing it this way the soldering iron was HUGE and the parts were still pretty small! But I did get the radio working again.
I didn't buy it from this supplier tho.
Vince - K8ZW.
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On 10/04/2018 12:42 PM, Harvey White wrote: On Thu, 4 Oct 2018 08:47:14 -0700, you wrote:
Interesting, I had good sight for most of my life but the ability to focus
on different size things has been getting worse lately and to read or
computer screens use 1.75 readers so I have been looking a bit into
magnification.
I have been using 3x reading glasses to do close soldering type work, but
then can't focus on the meters etc on the bench when it's time to plug in
with out changing back to 1.75X. You might be able to find bifocal reading glasses.
I use computer glasses myself, bifocal (blended) with the "far"
prescription set to "medium distance".
Harvey
Do you know if the focal distance etc is similar to 3X reading glasses?
And is it the flip up ability what makes that style work for you?
John
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dennis
McCreery
Sent: Thursday, October 04, 2018 8:06 AM
To: [email protected]
Subject: Re: [TekScopes] Good loupes
I use one of these and love it for close work:
Carson Optical Pro Series MagniVisor Deluxe Head-Worn LED Lighted Magnifier
with 4 Different Lenses (1.5x, 2x, 2.5x, 3x) (CP-60)
Regards,
Dennis
--
K8ZW
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I'm sure you can get adjustable ones, but I suspect they'll start to get
into real money. The cheap ones I'm familiar with have all been fixed
and I can't remember running across adjustable ones.
An alternative is to mount the loupes onto an old pair of glasses.
If you can wear contacts, that also works.
On the high end, your eye prescription is integrated into the loupe.
There are 2 types of loupes: Galilean or Keplarian. Higher
magnification (>= 4X) are primarily Keplarian which incorporates a
prism for a longer internal optical path. The cheap Chinese loupes
are primarily Galilean. (One type is not necessarily better than the
other, they're just different construction)
Here's a buying guide I ran across which might be useful.
Paul
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On Thu, Oct 04, 2018 at 05:47:00PM +0000, Dave Wise wrote: I'm interested. Do you know of a set with one-eye focus adjust? I'm way more nearsighted on the left than the right.
Dave Wise
________________________________________
From: [email protected] <[email protected]> on behalf of snapdiode via Groups.Io <snapdiode@...>
Sent: Wednesday, October 03, 2018 4:26 PM
To: [email protected]
Subject: Re: [TekScopes] Good loupes
Don't know. It focuses at about 8 inches in front of me. Wearing them takes getting used to, but it lets you work at a "normal" distance. I guess it's a YMMV situation, but I am quite pleased with my pair.
Chinese unbranded optics seem quite good, I bought a bunch of telephoto and macro and fisheye lenses for my phone and they are quite good.
!DSPAM:5bb64943285372743811987!
--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
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Re: Tektronix 2467B good buy?
On Thu, 4 Oct 2018, panpupez wrote: On Thu, Oct 4, 2018 at 05:47 AM, Sergey Kubushyn wrote:
9374L. I've been thinking of buying LC684DXL but it is not a very big
improvement for occasional use. I don't like DSOs and prefer my trusty
beloved 2467B unless I absolutely need some DSO-specific feature. It doesn't
happen often and for logic level signals I have HP 16702B with 10+ different
plugins that beats any DSO by light years in digital domain.
And I don't wanna use those Windoze-driven "instruments" at all. What do you like most in you 2468B (vs 9374L)? Immediate response, no dead time, very easy and intuitive to operate, immediate visibility of various rant pulses and irregularities (i.e. you can easily spot parasitic oscillation at pulse edges and elsewhere with amplitudes much smaller than main signal itself and frequencies several orders of magnitude higher than the main signal), no aliasing so what you see is actually what's in there, no need to fight with the part of signal of interest to fill the entire screen to get even 256-levels (8-bit) resolution so you can actually see something and simultaneously somehow making sure no part of the signal overloads the ADC and much more... They say newest DPO scopes are almost as good as analog ones but they are "almost" as good actually being nowhere near yet, prices are astronomical, they run Windoze and you have to pay extra for every sneeze beyond not very useful basic functionality. Then comes the very nature of the beast -- limited resolution so you can only see an approximation of whatever is there and you can NOT e.g. tell the thing oscillating by noticing the trace getting slightly "fatter", with that resolution decreasing if your signal does not take entire screen and everything screwed if it exceeds that, horrible deadtime, low repetition rate (you only have your screen updated 60 times per second at most), lack of analog persistence and much much more. Sure, there are SOME applications where they really shine and irreplaceable but many of those areas are covered with other, specialized instruments that are better for particular jobs (SA, VNA, LA, Modulation Analyzers, etc) and remaining few applications are specific for some particular jobs that are only relevant if one works in some special field. They are also good for documenting something because you don't have to take screenshots with a camera but other than that they have a long road ahead of them to get as good as old analog scopes. There is also another jewel I keep and admire -- 7834. It is big, ugly, requires significant effort to refurbish to like new condition but it has a huge assortment of different plugins that allow doing things not even dreamed of on most expensive DSOs and REAL analog variable persistence is light years ahead of DPO or whatever other simulation available in DSOs these days. It is real-time, incredible simple with just one stupid analog potentiometer control -- pure pleasure to work with... I am interesting because i use (and have) many analog and digital
oscilloscopes, and 9354L was the fist DSO i liked, mostly because great
functionality(mathematics), i can see signal buried in noise using
averaging, FFT, inboard CAL out+mathematics = frequency response
measurement, statistical measurement etc. Thats why i sold my 2465A at
that time. But 9354 have no analog persistence, not great sampling rate
and very big dead time compared to analog Tektronix. Now I use as main
scope LC684DXL, and it is a big step up comparing to 93xx series, but dead
time almost the same. And now i have not only on work, but also in home
lab NA and SA and don't need most of 684DXL features. I was thinking to
bye 2467B :) but i don't know why do i need it, maybe nostalgie.. --- * * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * *
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Re: Loading of 7104 power supply
Off the top of my head I don't recall, but there is a great cross reference (should be in the files section) of scope models vs PCBs types/numbers.
-Dave?
------------?Also, which of the 7000 Series oscilloscopes use the same power supply as the 7104?
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I have a spool of that clear round plastic. Anybody who needs a few yards, just let me know. Dave Wise ________________________________________ From: [email protected] < [email protected]> on behalf of ROLYNN PRECHTL K7DFW <k7dfw@...> Sent: Wednesday, October 03, 2018 4:56 PM To: [email protected]Subject: Re: [TekScopes] Cable lacing Does anyone know what the wiring harness lacing material is inside, say, a 1A4?
=================================================================================== When I was there during 1966-1971 the lacing was clear and round. It should be listed in one of the Common Design Books. Rolynn
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I'm interested. Do you know of a set with one-eye focus adjust? I'm way more nearsighted on the left than the right. Dave Wise ________________________________________ From: [email protected] < [email protected]> on behalf of snapdiode via Groups.Io <snapdiode@...> Sent: Wednesday, October 03, 2018 4:26 PM To: [email protected]Subject: Re: [TekScopes] Good loupes Don't know. It focuses at about 8 inches in front of me. Wearing them takes getting used to, but it lets you work at a "normal" distance. I guess it's a YMMV situation, but I am quite pleased with my pair. Chinese unbranded optics seem quite good, I bought a bunch of telephoto and macro and fisheye lenses for my phone and they are quite good.
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Re: Loading of 7104 power supply
It may be worth looking at the output of the opamps in the PSU current sense sections of the circuit.
In mine the 5V lighting circuit was shorting inside the PSU and that was the only way I found the problem.
Dave
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Gary Robert Bosworth Sent: 04 October 2018 18:03 To: [email protected]Subject: [TekScopes] Loading of 7104 power supply Does anyone know which of the ribbon connectors on the 7104 power supply that can be safely detached to determine which is causing excessive loading? Also, which of the 7000 Series oscilloscopes use the same power supply as the 7104?
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Look here:
Appears to be 2000-series.
Colin.
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Fred Thal Sent: 04 October 2018 16:44 To: [email protected]Subject: [TekScopes] 2815 Opto-scope? I have a 2815. I have no documentation for it. Can anyone tell me what family this Tek scope came from? In other words, what is the equivalent Tek scope series, without the optical power measurement feature? And, when was it made? Thanks in advance!
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Hi Maxim,
When you complete any calibration routine (eg. CALXX), the scope
will have stored the calibration constants, and when you leave the
calibration menu, it will recalculate the checksum for the block
of all calibration data. It will *not* recalculate the parity for
the individual calibration constants... only those that it
affected by calibration.
Do not waste your time with calibration until you have fixed the
cause of the Fail04. That means replacing the NVRAM or battery.
If you decide that you really want it calibrated, contact me off
group.
-Chuck Harris
Max Vlasov via Groups.Io wrote:
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Hello Chuck,
Thank you for answering.
My 2445a repair/calibration project is the life long (almost 10 years, almost no time). I should of given up on it long before, but it's just not an approach of an engineer to give up on something which almost already works (put lots of hours already, but 2445a in my setup will be more of an artifact). I just wanted to understand how serious is the data integrity failure (FAIL04) and whether I can do the calibration in steps powering up the o-scope every time for the new CALxx routine?
I simply assumed that if the data integrity is OK then I can do the CAL routines selectively (therefore the idea was to get the calibration data w/o errors and then do one calibration routine by another). Otherwise I have to go from the beginning though the end non-stop otherwise nothing will be stored... So far whatever I have calibrated wasn't taken into account by o-scope since I didn't have the right set of equipment to perform the CAL ALL. For example I did perform CAL01 and CAL02 separately, then powered off the scope then I'm back to the same problems. Like it was not simply stored.
Have you managed to calibrate the 24xx scope in separate CAL sessions by having initially FAIL04?
Also do you know which CAL routing will contribute to the AUTO LVL trigger function. In my case channel 1 with the replaced hybrid has the offset too high on AUTO LVL, so trigger level isn't found automatically.
Thank you again and all the Best,
Maxim
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Loading of 7104 power supply
Does anyone know which of the ribbon connectors on the 7104 power supply that can be safely detached to determine which is causing excessive loading? Also, which of the 7000 Series oscilloscopes use the same power supply as the 7104?
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I have a 2815.
I have no documentation for it.
Can anyone tell me what family this Tek scope came from?
In other words, what is the equivalent Tek scope series, without the optical power measurement feature?
And, when was it made?
Thanks in advance!
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On Thu, 4 Oct 2018 08:47:14 -0700, you wrote: Interesting, I had good sight for most of my life but the ability to focus
on different size things has been getting worse lately and to read or
computer screens use 1.75 readers so I have been looking a bit into
magnification.
I have been using 3x reading glasses to do close soldering type work, but
then can't focus on the meters etc on the bench when it's time to plug in
with out changing back to 1.75X. You might be able to find bifocal reading glasses. I use computer glasses myself, bifocal (blended) with the "far" prescription set to "medium distance". Harvey
Do you know if the focal distance etc is similar to 3X reading glasses?
And is it the flip up ability what makes that style work for you?
John
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dennis
McCreery
Sent: Thursday, October 04, 2018 8:06 AM
To: [email protected]
Subject: Re: [TekScopes] Good loupes
I use one of these and love it for close work:
Carson Optical Pro Series MagniVisor Deluxe Head-Worn LED Lighted Magnifier
with 4 Different Lenses (1.5x, 2x, 2.5x, 3x) (CP-60)
Regards,
Dennis
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The Mantis and other stereo microscopes can only look straight down (with some exceptions, of course). Loupes, Optivisors, and similar head mounted optical systems can look wherever is convenient. It is not easy to do wrist watch work with a stereo microscope. About the only which way I don't need to see is straight down. But they're ideal for soldering and are available on the surplus market. I'm now going to seriously consider a dental loupe, and I thank you and the others for bringing it up. -Bob On Thu, Oct 4, 2018 at 9:55 AM Mark Goldberg <marklgoldberg@...> wrote: I'm jealous. The Mantis is the greatest thing since sliced bread,
especially if you wear glasses. Wish I had one.
In my opinion, from best to worst:
Mantis
Binocular Microscope (I have an Amscope SE-400Z)
Dentist style optical loupes
Optivisor or similar
Lots of light is also a big help. I can use my microscope without my
glasses, even though I have astigmatism with enough light to close down my
irises and minimize it. I do very tiny SMT work with 61 year old eyes.
Luckily, hands are still steady!
Regards,
Mark
On Thu, Oct 4, 2018 at 5:21 AM Paul Amaranth <paul@...> wrote:
I have a couple pair of the cheap loupes. The 3.5X are pretty handy for
general work and I use them quite a bit. I also have a higher power set
but those are not very good since they shake with my pulse which is
annoying.
I also bit the bullet and found a Mantis. I use that for serious
work but keep the loupes handy for small jobs.
Paul
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Hello Chuck,
Thank you for answering.
My 2445a repair/calibration project is the life long (almost 10 years, almost no time). I should of given up on it long before, but it's just not an approach of an engineer to give up on something which almost already works (put lots of hours already, but 2445a in my setup will be more of an artifact). I just wanted to understand how serious is the data integrity failure (FAIL04) and whether I can do the calibration in steps powering up the o-scope every time for the new CALxx routine?
I simply assumed that if the data integrity is OK then I can do the CAL routines selectively (therefore the idea was to get the calibration data w/o errors and then do one calibration routine by another). Otherwise I have to go from the beginning though the end non-stop otherwise nothing will be stored... So far whatever I have calibrated wasn't taken into account by o-scope since I didn't have the right set of equipment to perform the CAL ALL. For example I did perform CAL01 and CAL02 separately, then powered off the scope then I'm back to the same problems. Like it was not simply stored.
Have you managed to calibrate the 24xx scope in separate CAL sessions by having initially FAIL04?
Also do you know which CAL routing will contribute to the AUTO LVL trigger function. In my case channel 1 with the replaced hybrid has the offset too high on AUTO LVL, so trigger level isn't found automatically.
Thank you again and all the Best,
Maxim
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Diopters is the focal length in meters inverted.?? Drug store reading
glasses are sold by diopter strength.
Pete.
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On 10/4/2018 11:47 AM, ykochcal wrote: Interesting, I had good sight for most of my life but the ability to focus
on different size things has been getting worse lately and to read or
computer screens use 1.75 readers so I have been looking a bit into
magnification.
I have been using 3x reading glasses to do close soldering type work, but
then can't focus on the meters etc on the bench when it's time to plug in
with out changing back to 1.75X.
Do you know if the focal distance etc is similar to 3X reading glasses?
And is it the flip up ability what makes that style work for you?
John
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dennis
McCreery
Sent: Thursday, October 04, 2018 8:06 AM
To: [email protected]
Subject: Re: [TekScopes] Good loupes
I use one of these and love it for close work:
Carson Optical Pro Series MagniVisor Deluxe Head-Worn LED Lighted Magnifier
with 4 Different Lenses (1.5x, 2x, 2.5x, 3x) (CP-60)
Regards,
Dennis
|
You can replace the CMOS RAM and battery with a NVRAM
(or FRAM) with a little work.
You have to remove the battery, cover it over with a label
describing the modification (because you are nice).
You also have to provide a voltage to the CPU's battery
detect circuit to fool it into thinking it has a good battery.
After doing that, you program the new NVRAM with the old
NVRAM's contents, and plug it in.
However, your calibration will be wrong for your scope, as
the NVRAM's files are unique to the scope that created it.
I wouldn't do the above, as the battery/cmos RAM combination
lasts a lot longer than an NVRAM, and cribbed calibration data
is worse than no calibration data at all.
When you plug a new NVRAM into your scope, and turn the power
on for the first time, the firmware installs a default set of
calibration constants into the constant area, and sets the
uncalibrated flag so that the screen has a row of dots along
the bottom, to announce to the world the scope is uncalibrated.
The only logical reason to program the NVRAM with someone else's
data is if you want to fool a buyer into thinking the scope is
calibrated.
-Chuck Harris
Max Vlasov via Groups.Io wrote:
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Hi,
Also have anyone transferred the 2445B NVRAM content into the 2445A SRAM?
There is a 2445B NVRAM file kindly uploaded by Mitchell Kobierowski in this forum. Technically it's possible to upload it into the 2445A SRAM (connect the voltage source via the current limiter while being in the ROM programmer tester and then bring it back to the A5 board). I hope it should fix the FAIL04 prompt and restore the calibration data integrity. Since my 2445a has option 05 (video triggering), I would have to recalibrate it later on together with CAL01, CAL02, CAL03.... but one at a time.
I wonder if doing CAL one at a time is possible at all..
Thank you,
All the Best,
Maxim
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I'm jealous. The Mantis is the greatest thing since sliced bread,
especially if you wear glasses. Wish I had one.
In my opinion, from best to worst:
Mantis
Binocular Microscope (I have an Amscope SE-400Z)
Dentist style optical loupes
Optivisor or similar
Lots of light is also a big help. I can use my microscope without my
glasses, even though I have astigmatism with enough light to close down my
irises and minimize it. I do very tiny SMT work with 61 year old eyes.
Luckily, hands are still steady!
Regards,
Mark
toggle quoted message
Show quoted text
On Thu, Oct 4, 2018 at 5:21 AM Paul Amaranth <paul@...> wrote: I have a couple pair of the cheap loupes. The 3.5X are pretty handy for
general work and I use them quite a bit. I also have a higher power set
but those are not very good since they shake with my pulse which is
annoying.
I also bit the bullet and found a Mantis. I use that for serious
work but keep the loupes handy for small jobs.
Paul
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Dennis McCreery
Sergey Kubushyn
David C. Partridge
Gary Robert Bosworth
redarlington