Re: 7912AD Fails start-up self-test (perhaps)
Adrian,
There is a jumper on the A28 board for 525/625 operation of the composite video but it should affect the 7000 plugin readout (CPU generated) and the read gun scanning consistently. There are multiple jumpers for normal or fast scan and these need to be consistent. Pages 4-9 onwards of service manual 2 give all the jumper settings. If my memory is correct the digital display does not show the readout from the plugins.
Regards,
Roger
|
I brought home today a 11403A.
But when I got it home the "MENUS" -> Waveforms button had vanished.
I can salvage buttons off the stack of 11401 and 11402s that are going in
the scrap pile so no problem there.
but does anybody know if there's a procedure is there a lip behind the
button where maybe the bezel has to come off ?
All the years of using 11k scopes this is never happened to me.
|
Hi Fabio, Thanks for your comments. The film cap seemed like it was zdded
as a repair attempt and wasn't particularly large. Maybe 7 mm square and
clearly marked 47 mf. Like a small blue chicle. I have lots of similar
sized caps for use as tone caps but of less capacitance. They are usually
of higher voltage ratings. I believe this one was 63v. Ill check to see if
i tossed it.
The - 8v is the only rail that is still low. Ill do some further testing
tomorrow hopefully. We can get some pretty close lightning strikes during
our monsoon season and that can cut into my bench time. My wife is in the
states for a month also and it takes allot for me to also keep up with what
she does for us too. I did take time to watch Brazil ice Mexico today.
We're used to it by now. At least now I know someone from Brazil to
congratulate on a good game. Good luck on the next games.
I'll report my findings and will certainly have questions, but it seems the
logical next step is to clean out the trash in the -8v rail.
Thx, Russ
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On Monday, July 2, 2018, Fabio Trevisan <fabio.tr3visan@...> wrote: Hello Russ,
Glad to hear that the +15V PS woke up, and by consequence, the +5V and
also, somewhat, the -8V (although this one is clearly on the lack).
I have two comments...
1. I got confused by some post of another member, after yours #149308,
still providing suggestions for the low +55V condition... as if it would
still be on the low side.
This takes me to conclude that it's not very clear to everybody there's
nothing wrong anymore, either with the +55V, or with the +15V.
Maybe you can elucidate a little on that to avoid further misunderstanding.
I`m also somewhat puzzled by the description of the capacitor you found
guilty at the C1549 position.
There couldn't be a mylar capacitor there... first because a 47uF mylar
capacitor would be humongous and wouldn't even fit in that space... second
because it would be very unlikely to fail under such low voltage... The
least voltage I've ever seen a film capacitor was something like 63V.
Well, me puzzled or not... it seems you grabbed the bulls by the horn.
Cheers for that.
2. Regarding the -8V power supply... I'm afraid that, while you were so
lucky on the +15V side, to find the shorted culprit in the very first
attempt, you may not be so lucky this time... First because it's not a
"dead short"... it can be just something drawing too much current (such as
another decoupling capacitor), or maybe the -8V power supply is at fault.
Anyway, when you find a wrong power supply rail, there's not much
troubleshooting advice than to hunt down the power sucker... it can be
anything connected to that particular rail.
Sometimes you're lucky and that supply is distributed through connectors
and cables... and in such case, you can rule-out possible culprits by just
lifting the pin on the connector, narrowing down the number of places to
look for possible culprits.
The -8V power supply looks rather unintuitive, because they chose to make
it a "positive supply", and hook the "regulated" positive output to ground,
while taking the negative output from the "unregulated" output of the
rectifier and bulk capacitor.
But other than that, it is and it works exactly the same as the +15V
supply, and the troubleshooting is also the same, just transposing the
measurements to the corresponding components.
Kindest Rgrds,
Fabio
P.S. Sorry for your fellow folks there in MEX. Today was our lucky day
(I`m Brazilian).
On Fri, Jun 29, 2018 at 10:57 am, musicamex wrote:
One step closer! C1549 looked like it might have been replaced with a
mylar
cap. As soon as I unsoldered one side and turned on the scope, the fan came
on! So i replaced it with a 47mf 25 v electrolytic and now had a bit of a
trace but way off vertical axis. Good call Albert!
The voltages now are112.5, 55.66, 15.1, 4.9 and -6.4
I see that the vertical axis is associated with the -8 rail and read the
troubleshooting for vertical axis anomalies but before I go further I thought
I check for advice here first.
Thanks in advance, Russ
--
Good judgement comes from experience; experience comes from bad judgement.
99 times out of 10 a blown fuse is not due to a bad fuse.....
|
Just to let ya'all I posted the DC508 on Ebay with pictures it does power on and read outs are perfect like i said it looks to be new not used or used very little.
Jim
|
Re: TDS5xx Recap was TDS5xx upgrades/mods
On 2018-07-02 9:04 PM, Miles Paulson wrote: Got the scope, and upon inspection it does in fact need a recap. Fortunately, I don¡¯t see much carnage. I know for the 24x5 series there is much debate on what series Nichicon or Panasonic caps to use. Is there a preferred cap series to use in these series of scopes? I plan to make a Mouser purchase soon, and want to try to get everything in one swoop.
So I suppose I'd better check out the guts of my TDS460A... --Toby
|
Re: TDS5xx Recap was TDS5xx upgrades/mods
Got the scope, and upon inspection it does in fact need a recap. Fortunately, I don¡¯t see much carnage. I know for the 24x5 series there is much debate on what series Nichicon or Panasonic caps to use. Is there a preferred cap series to use in these series of scopes? I plan to make a Mouser purchase soon, and want to try to get everything in one swoop.
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Miles Paulson Sent: Monday, July 02, 2018 11:57 AM To: [email protected]Subject: Re: [TekScopes] TDS5xx upgrades/mods Thanks for the info! About what I expected though. It seems like the letter scopes are much more popular, probably because of their hackability. I still think I got a good deal on this scope (Paid less than $200 shipped), all it appears to really need is a recapping. I have read about the horror stories about damaged passives and traces, so I hope this one isn¡¯t very bad off. It is supposed to be delivered today, so I will be able to get a better idea later today. -----Original Message----- From: [email protected] < [email protected]> On Behalf Of zenith5106 Sent: Saturday, June 30, 2018 3:36 PM To: [email protected]Subject: Re: [TekScopes] TDS5xx upgrades/mods On Sat, Jun 30, 2018 at 12:37 pm, Miles Paulson wrote:
I just purchased a TDS520 non letter scope. I am still waiting for it
to be delivered, and I will need to recap it as it has a few errors.
But, I have been looking without much success for any upgrades or mods
for the non letter scopes. I have been wondering if it is possible to
upgrade the 520 to a 540 without much fuss. Also, I am wondering if
it's possible to add a VGA out like the letter scopes?
Thanks
TDS520 and TDS540 share most of the hardware so it can be done but probably with more fuss than you want. Since the Acq boards are totally different you will need such a board from a TDS540, TDS540A or TDS544A. You must also be able to load TDS540 firmware and then perform a complete Adjustments procedure which takes hours and require calibration instruments like a DC calibrator and a leveled 500 MHz signal generator. Adding a couple of BNC connectors on the rear panel has to done if you want it to be like a TDS540. As far as I remember there is no VGA connector on the CPU/Display board. /H?kan
|
Re: Transistor Full Documentary
No kidding, CWRU offered you a job?? That's my alma mater; I got my BSEE there in 1988.
Moved out to Southern California 30 years ago this September.?
Small world!
Jim
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: Jeff Urban <JURB6006@...> Date: 7/2/18 3:45 PM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Transistor Full Documentary Sorry, I only scanned it because I can't sit through something that long. I mean not only mentally, but physically. But, the transistor is one thing that the US does get credit for, period. That and the first fully compatible color TV system. I could go down in the basement and watch it where I have a much better place to sit, but if I am going to spend an hour down there I am going to do something, From what I saw of it, that video should be presented in engineering classes, first year. Give them a connection to the past and realize that everything was not invented in their lifetime. Not all at once, in a half hour class, give them 15 minutes at a time, then have a discussion about it. I was offered $ 35 an hour to teach basic electronics at Case Western Reserve U in Cleveland. I gave it some thought, and while i think it could turn out good, all the other stuff, developing a curriculum, and then tests, and if too may students get a certain question wrong them I must adapt, figure that I failed to teach that part. It would be a job that I took home all the time and I valued my spare time. But yes, I would have had that in there, but first I would have one about vacuum tubes. Actually I would like a transcript of a video like that. I don't really need the visuals. Glad you posted it, I might watch it in spurts, downstairs. In my uncomfortable chair that? is good for my back. Thanks.
|
Vintage Tek Museum - sacn of microfiche?
How's that effort going? I'm particularly interested to get a scan of the
RPR, and also Wizards Workshop
Dave
|
Re: 7854 readout does not conform to specification? (7L5 problem)
H?kan,
Do you have scans of the Wizards Workshop articles. They sound like an incredibly useful reference.
Dave
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of zenith5106 Sent: 02 July 2018 23:02 To: [email protected]Subject: Re: [TekScopes] 7854 readout does not conform to specification? (7L5 problem) This problem was addressed In a WW (Wizards Workshop) article from 2-85 which
said it was fixed by Mod 50646. It is only a change of one resistor value in the 7L5:
Change R2340 on the Vertical Board (A200A2) from 150k to 49.9k.
/H?kan
|
Re: Looking for Rare Trace Rot/Trace Sep Pot for 556
Does either pot work ? I suspect the separation might be one of their fancy play pots, it moves one pot so much and then the other after like 7 degrees or so of rotation. The trace rotation can usually be subbed anywhere, it should rarely need adjustment. Most of the need for it is because of tolerances in the CRT, not the Earth's magnetic field. if it was the Earth's magnetic field you would see the trace move if you had a speaker next to it, the poles of the Earth are very weak.
|
Re: Transistor Full Documentary
Sorry, I only scanned it because I can't sit through something that long. I mean not only mentally, but physically.
But, the transistor is one thing that the US does get credit for, period. That and the first fully compatible color TV system.
I could go down in the basement and watch it where I have a much better place to sit, but if I am going to spend an hour down there I am going to do something,
From what I saw of it, that video should be presented in engineering classes, first year. Give them a connection to the past and realize that everything was not invented in their lifetime. Not all at once, in a half hour class, give them 15 minutes at a time, then have a discussion about it.
I was offered $ 35 an hour to teach basic electronics at Case Western Reserve U in Cleveland. I gave it some thought, and while i think it could turn out good, all the other stuff, developing a curriculum, and then tests, and if too may students get a certain question wrong them I must adapt, figure that I failed to teach that part. It would be a job that I took home all the time and I valued my spare time.
But yes, I would have had that in there, but first I would have one about vacuum tubes.
Actually I would like a transcript of a video like that. I don't really need the visuals.
Glad you posted it, I might watch it in spurts, downstairs. In my uncomfortable chair that is good for my back. Thanks.
|
Re: 7854 readout does not conform to specification? (7L5 problem)
On Mon, Jul 2, 2018 at 01:03 pm, Nenad Filipovic wrote:
I wonder if all 7L5s (including ones with new digital boards) suffer from
this problem in 7854. I already lost weeks trying to fix this and I'm quite
disappointed. Conversion to make 7854 capture 7L5 spectrums was piece of
cake, but this "tiny" readout bug is a nightmare if you make a lot of
average level measurements.
If anybody has any hints or extra documentation on 7854 readout, I'd
appreciate any help...
This problem was addressed In a WW (Wizards Workshop) article from 2-85 which said it was fixed by Mod 50646. It is only a change of one resistor value in the 7L5: Change R2340 on the Vertical Board (A200A2) from 150k to 49.9k. /H?kan
|
Parting out 465 (not B) and a 464
You may have read my previous thread on attempting to repair these, but that is not to be. I've decided to part these out. Probably too heavy/expensive to ship complete (for what you want to pay for them).
465 SN B175976: Was working until I somehow killed the CRT HV circuit, so I believe the other boards work fine. I think the CRT tube and the feet are already claimed (not 100% sure).
464 SN B2000087: Never worked in my hands. I bought it from a guy who said it was stored for more than 10 years. Same problem- no trace, not dot, probably a CRT HV problem as well. Internally, this is the cleanest scope I've ever seen. No feet.
If you are interested in any parts from these please contact me in PM or email (stuff@...), NOT on this forum. Make a reasonable offer. If international, don't forget shipping overseas is expensive and time consuming!
Keith Ostertag
New Albany, IN 47150
|
Re: What are these Tek parts for?
A quick check with my buddy Google shows that Nielsen is still in business.
The can best tell you where to find the catch, possible provide samples.
The self tapping screw is available at any well stocked hardware store, or your junque box from old equipment that you have scrapped and kept the parts.
The spacer may be a problem if your are not handy with tools and make your own.
Glenn
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On 7/2/2018 3:34 PM, David Berlind wrote: wow.. awesome . .thanks for providing that. Yes, would love some photos and
do you know where I can go to get those parts? Or, am I really just subject
to digging around the aftermarket?
On Mon, Jul 2, 2018 at 3:29 PM, Colin Herbert via Groups.Io <
colingherbert@...> wrote:
I have a 7623A with option #8 (the front cover). The catch hooks on the
scope itself also have a thicker metal stand-off under the hook. If you
can't get the proper items, I can take some measurements and photos to
help. The relevant Tek part numbers are:
105-0390-00 Catch, clamping Nielsen
Hardware Corp. Part No. SC-B-83314
213-0119-00 Screw, tapping, 4-24 x 0.375 inch, pan head, steel.
Central Screw Co.
361-0480-00 Spacer, latch
Tektronix
Good Luck, Colin.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David
Berlind
Sent: 02 July 2018 16:58
To: [email protected]
Subject: Re: [TekScopes] What are these Tek parts for?
OK. It appears you are correct about the left part. I now realize that my
OS-245 (milspec 7603) is missing the receiving side of the clips to which
the cover attaches. I've added photos to the aforementioned online image
album <>. So, I'd like to find
those clips if someone know where I can get them. Either that, or I'll have
to fabricate them. I bump into these sorts of clips all the time (trying to
think if there something around the house I can harvest them from).
But the other part pictured does not match up to anything I can tell.
On Mon, Jul 2, 2018 at 6:43 AM, Colin Herbert via Groups.Io <
colingherbert@...> wrote:
One of those looks like the front cover for a series-7000 scope (option
#8). It even still has the foam bits for holding probe parts. I've no idea
what the other thing is, but could it be some kind of implosion screen?
Colin.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David
Berlind
Sent: 02 July 2018 02:14
To: [email protected]
Subject: [TekScopes] What are these Tek parts for?
Two parts... some sort of cover.. but I don't think it's for anything I
own. Smells like an old Tek scope too! If I have no need for this and
someone else does, I'd be happy to stick it in a box if you cover postage.
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
|
Hi Hankc,
many thanks for this really nice and interesting video.
Alessandro Cattaneo
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Il Luned¨¬ 2 Luglio 2018 7:47, tek_547 <R.Kelbling@...> ha scritto:
Interesting stuff, thanx!!
|
7854 readout does not conform to specification? (7L5 problem)
Hi Everybody,
This one is for 7000 series readout experts, hope you're out there
somewhere. I have a properly working late model 7854 that I'd like to use
with my 7L5 (early serial with old digital board, successfully converted
for use in 7854, will post full instructions on this modification later as
officially these do not exist for the old 7L5). Everything works fine
except the damn level readout that I really, really need because I heavily
use the 7854 averaging and math functions. The problem can be split in two
points:
1. Incorrect level readout in LIN mode - turning the attenuator should
produce the expected 200mV-100mV-50mV-20mV... sequence, but instead 7854
displays 2mV-1mV-5mV-2mV... and so on in circle (zeroes are omitted, units
and first digit are fine).
2. 7L5 readout driving circuitry can be slightly modified to fix the
mentioned problem, but although that fixes the display perfectly (and is
fully compatible with other mainframes using "classic" readout boards), it
breaks the ability of the 7854 storage to correctly obtain a scale factor
for acquired waveforms. So to summarize:
- If readout is broken in 2mV-1mV-5mV-2mV... way, 7854 acquire command (at
least) captures the same scale factor (2mV-1mV-5mV-2mV...)
- If readout is fixed to show 200mV-100mV-50mV-20mV..., 7854 acquire
command displays a warning and sets 1 as the default scale factor
I believe the problem is fully on the 7854 side, now for some gritty
technical details if you're still with me. 7L5 uses a non-standard (but
still technically perfectly correct) mode to display readout, using all 10
time slots (TS1-TS10). For example the word "200mV" in LIN mode would be
encoded in the following way:
ROW address: 3221115545
COL address: 0003110012
where digit position denotes a time slot (from left to right TS1-TS10). For
comparison word "-123dBV" in LOG mode would be:
ROW address: 2221115545
COL address: 0062346702
Quick reference to the address table:
Column address 0 in TS1 denotes a SKIP operation, it's obvious that the two
zeroes in 200mV are coded in TS5 and TS6 (non-standard format) as opposed
to standard format that uses TS1 to specify "add one zero" or "add two
zeroes" operational addresses. So if 7L5 does a SKIP in TS1, ROW address
should make no difference (as long as it's in 1-9 range). On mainframes
with classic readout boards (tested on 7633 and 7104) it indeed makes no
difference, but on 7854 it painfully breaks stuff:
- if ROW=2 in TS1, readout correctly displays 200mV-100mV-50mV-20mV... but
storage acquire fails to obtain the scale factor
- if ROW=3 in TS1 (7L5 factory default), readout breaks and displays
2mV-1mV-5mV-2mV... storage acquires the (broken) scale factor
- if ROW=4,5..9 in TS1, readout correctly displays 200mV-100mV-50mV-20mV...
but storage acquire fails to obtain the scale factor
7000/7854 readout specification makes no mention of such nonsense. To add
to the confusion, 7L5 service manual mentions Q2325 (page 2-19) that sets
ROW=3 in TS1 in LIN mode (although TS1 COL=0 which denotes SKIP), but with
no explanation. In LOG mode Q2325 is off and ROW=2.
I wonder if all 7L5s (including ones with new digital boards) suffer from
this problem in 7854. I already lost weeks trying to fix this and I'm quite
disappointed. Conversion to make 7854 capture 7L5 spectrums was piece of
cake, but this "tiny" readout bug is a nightmare if you make a lot of
average level measurements.
If anybody has any hints or extra documentation on 7854 readout, I'd
appreciate any help...
Best Regards,
Nenad Filipovic
|
Yep Albert,
Indeed, it was your post I was referring to... I wasn't sure though, if there was still a misunderstanding that the +55V was at fault.
I see now what you mean... and indeed, the shorted decoupling capacitor on the +15V supply doesn't explain (at least, not directly) why the +55V was low until then.
If nothing else was burnt, than I suppose that the circuits that are fed from the +55V (I think of Vertical amplifier, which is the main power hog for the +55V), by being improperly biased (due to the absence of the +15V) were maybe drawing too much current from the +55V, causing it to be lowered??? That's just a big question-mark yet to be answered.
The absence of the +15V and improper biasing of all its "customers", who knows for how long, may have led to other things burning as well, which may explain the now low voltage of the -8V.
Or it may simply be another dreaded tantalum capacitor.
Rgrds,
Fabio
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Show quoted text
On Mon, Jul 2, 2018 at 11:52 am, Albert Otten wrote:
Hi Fabio,
I have two comments...
1. I got confused by some post of another member, after yours #149308, still
providing suggestions for the low +55V condition... as if it would still be
on
the low side.
This takes me to conclude that it's not very clear to everybody there's
nothing wrong anymore, either with the +55V, or with the +15V.
[snip]
Fabio
That other member must have been me I think. But I wrote this:
I suppose that since 55.66 V is OK the low reading 46.9 V can only be due to
a too heavy load at the +55V rail.
So what I meant is that since there is no problem *now* with +55V, there was
also no problem *earlier*, and the earlier reading 46.9 V can only be
explained by a (then) to heavy load on the +55V rail. I wondered where that
heavy load could come from but didn't find the answer. And apparently nobody
so far (but I guess nobody is searching for that...).
Albert
|
Re: What are these Tek parts for?
wow.. awesome . .thanks for providing that. Yes, would love some photos and do you know where I can go to get those parts? Or, am I really just subject to digging around the aftermarket? On Mon, Jul 2, 2018 at 3:29 PM, Colin Herbert via Groups.Io < colingherbert@...> wrote: I have a 7623A with option #8 (the front cover). The catch hooks on the
scope itself also have a thicker metal stand-off under the hook. If you
can't get the proper items, I can take some measurements and photos to
help. The relevant Tek part numbers are:
105-0390-00 Catch, clamping Nielsen
Hardware Corp. Part No. SC-B-83314
213-0119-00 Screw, tapping, 4-24 x 0.375 inch, pan head, steel.
Central Screw Co.
361-0480-00 Spacer, latch
Tektronix
Good Luck, Colin.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David
Berlind
Sent: 02 July 2018 16:58
To: [email protected]
Subject: Re: [TekScopes] What are these Tek parts for?
OK. It appears you are correct about the left part. I now realize that my
OS-245 (milspec 7603) is missing the receiving side of the clips to which
the cover attaches. I've added photos to the aforementioned online image
album <>. So, I'd like to find
those clips if someone know where I can get them. Either that, or I'll have
to fabricate them. I bump into these sorts of clips all the time (trying to
think if there something around the house I can harvest them from).
But the other part pictured does not match up to anything I can tell.
On Mon, Jul 2, 2018 at 6:43 AM, Colin Herbert via Groups.Io <
colingherbert@...> wrote:
One of those looks like the front cover for a series-7000 scope (option
#8). It even still has the foam bits for holding probe parts. I've no idea
what the other thing is, but could it be some kind of implosion screen?
Colin.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David
Berlind
Sent: 02 July 2018 02:14
To: [email protected]
Subject: [TekScopes] What are these Tek parts for?
Two parts... some sort of cover.. but I don't think it's for anything I
own. Smells like an old Tek scope too! If I have no need for this and
someone else does, I'd be happy to stick it in a box if you cover postage.
|
Re: What are these Tek parts for?
I have a 7623A with option #8 (the front cover). The catch hooks on the scope itself also have a thicker metal stand-off under the hook. If you can't get the proper items, I can take some measurements and photos to help. The relevant Tek part numbers are:
105-0390-00 Catch, clamping Nielsen Hardware Corp. Part No. SC-B-83314
213-0119-00 Screw, tapping, 4-24 x 0.375 inch, pan head, steel. Central Screw Co.
361-0480-00 Spacer, latch Tektronix
Good Luck, Colin.
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of David Berlind Sent: 02 July 2018 16:58 To: [email protected]Subject: Re: [TekScopes] What are these Tek parts for? OK. It appears you are correct about the left part. I now realize that my OS-245 (milspec 7603) is missing the receiving side of the clips to which the cover attaches. I've added photos to the aforementioned online image album <>. So, I'd like to find those clips if someone know where I can get them. Either that, or I'll have to fabricate them. I bump into these sorts of clips all the time (trying to think if there something around the house I can harvest them from). But the other part pictured does not match up to anything I can tell. On Mon, Jul 2, 2018 at 6:43 AM, Colin Herbert via Groups.Io < colingherbert@...> wrote: One of those looks like the front cover for a series-7000 scope (option
#8). It even still has the foam bits for holding probe parts. I've no idea
what the other thing is, but could it be some kind of implosion screen?
Colin.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David
Berlind
Sent: 02 July 2018 02:14
To: [email protected]
Subject: [TekScopes] What are these Tek parts for?
Two parts... some sort of cover.. but I don't think it's for anything I
own. Smells like an old Tek scope too! If I have no need for this and
someone else does, I'd be happy to stick it in a box if you cover postage.
|
Thanks for the info! About what I expected though. It seems like the letter scopes are much more popular, probably because of their hackability. I still think I got a good deal on this scope (Paid less than $200 shipped), all it appears to really need is a recapping. I have read about the horror stories about damaged passives and traces, so I hope this one isn¡¯t very bad off. It is supposed to be delivered today, so I will be able to get a better idea later today.
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of zenith5106 Sent: Saturday, June 30, 2018 3:36 PM To: [email protected]Subject: Re: [TekScopes] TDS5xx upgrades/mods On Sat, Jun 30, 2018 at 12:37 pm, Miles Paulson wrote:
I just purchased a TDS520 non letter scope. I am still waiting for it
to be delivered, and I will need to recap it as it has a few errors.
But, I have been looking without much success for any upgrades or mods
for the non letter scopes. I have been wondering if it is possible to
upgrade the 520 to a 540 without much fuss. Also, I am wondering if
it's possible to add a VGA out like the letter scopes?
Thanks
TDS520 and TDS540 share most of the hardware so it can be done but probably with more fuss than you want. Since the Acq boards are totally different you will need such a board from a TDS540, TDS540A or TDS544A. You must also be able to load TDS540 firmware and then perform a complete Adjustments procedure which takes hours and require calibration instruments like a DC calibrator and a leveled 500 MHz signal generator. Adding a couple of BNC connectors on the rear panel has to done if you want it to be like a TDS540. As far as I remember there is no VGA connector on the CPU/Display board. /H?kan
|
David C. Partridge
Jeff Urban
zenith5106
Fabio Trevisan