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Re: 2430 Self Test 9000 Trigs FAIL

 

On Wed, Aug 26, 2020 at 03:00 AM, Mike Harmon wrote:


If I press the "Extended Functions" button, the screen comes up with "SYSTEM"
"SPECIAL" and "CAL / DIAG" along the bottom of the screen. However, if I then
press the bezel button beneath the "CAL / DIAG" text on the screen to go into
diagnostics mode, nothing happens. Is this a software problem, or should I
look to see if perhaps the button isn't making contact?
Mike,
Read the applicable parts of the Service Manual. Often, when a 2430-family instrument hasn't been used for quite a while, you have to do some automatic testing/configuring. I did that last on a newly acquired 2440 a few months ago but I forgot which specific things to do. I think the functions are part of the set that need the calibration jumper inside the instrument to be set to cal.
Also, you can drill through from thePass/Fail top level group.
Anyway, I had several error messages that cleared by just going through some automatic procedures from the service manual. No calibration, no need to apply special signals.

Raymond


Re: 2430 Self Test 9000 Trigs FAIL

Craig Cramb
 

bezel button beneath the "CAL / DIAG" text on the screen to go into diagnostics mode,

This is a dual function button. The Cal is only available if you reposition the Cal/NoCal jumper J156 is removed. I highly recommend you purchase a 2430 service manual to prevent you from doing something that isn’t needed and you digging yourself into a deeper hole. These aren’t to terribly hard to get back functional but easy to make it worse to where you have to spend a lot more time to correct.
It’s not a software problem you are seeing just the other function of the button (diagnostics) that’s why you see it load the Diag information.


Re: 2430 Self Test 9000 Trigs FAIL

 

On Wed, Aug 26, 2020 at 01:05 AM, Mike Harmon wrote:


I don't know how to connect a picture with a post, but if you click on
'Photos' on the left side of the page, it's the first pic to come up.
Sorry for the bluntness in my earlier response, Mike. It didn't come up for me because my photos section is set to sort on oldest first and I didn't remember.
You may copy the contents of the address bar when the photo/album is visible and paste that in a message. That's how I do it.

Raymond


Re: New to me 7854.

Harvey White
 

as far as I know, almost anything should work well with the note that the 7B87 is a preferred plugin for horizontal sweep because the trigger (AFAIK) is handled differently and is unique for this particular scope.  The 7B87 may be a bit rare.  While I don't have a 7854 (that what you meant?  If not, please ignore all of the above), that's what I've heard.  Do, perhaps one day, expect to have one.

Harvey

On 8/25/2020 9:05 PM, Eric wrote:
I though I would take a look at restoring a 7584 as well and the unit got delivered today. It came with the keyboard and option 2D the memory upgrade. But there is always a catch it did not come with plugins. I have quite a few 7000 series plugins on the shelf that I can use it in but I am wondering what a typical plugin compliment would be from my early reading of the manual It looks like anything north of the 7B53 should work because of the short delay line or did this unit need special time bases due to the digitizer?



New to me 7854.

Eric
 

I though I would take a look at restoring a 7584 as well and the unit got delivered today. It came with the keyboard and option 2D the memory upgrade. But there is always a catch it did not come with plugins. I have quite a few 7000 series plugins on the shelf that I can use it in but I am wondering what a typical plugin compliment would be from my early reading of the manual It looks like anything north of the 7B53 should work because of the short delay line or did this unit need special time bases due to the digitizer?


Re: 2430 Self Test 9000 Trigs FAIL

Mike Harmon
 

More Information on this issue --

If I press the "Extended Functions" button, the screen comes up with "SYSTEM" "SPECIAL" and "CAL / DIAG" along the bottom of the screen. However, if I then press the bezel button beneath the "CAL / DIAG" text on the screen to go into diagnostics mode, nothing happens. Is this a software problem, or should I look to see if perhaps the button isn't making contact?

Mike, WB0LDJ
mharmon at att dot net


Re: PS503A Mod FF Photos?

Jared Cabot
 

I understand that Mod FF only gives +/- 0.5V adjustment, but that is enough to account for voltage drop over wires and give a little leeway here and there (say, a little extra for a Raspberry Pi or similar) etc.

I found the manual on the Tek Wiki site, but I was just hoping to find a photo of the physical implementation to see how difficult it would be to retrofit 'just because'.


Re: Tek 4041 GPIB Controller

Monty McGraw
 

Due to popular demand :) , I created a youtube video of running 4041 Artillery using a 4052 as the graphics terminal. https://www.youtube.com/watch?v=i6S_znFknnQ

The optional 4041 Graphics ROMs support the entire series of Tektronix storage terminals and color graphics terminals, or you can use your PC to emulate a Tektronix terminal with this program: https://github.com/rricharz/Tek4010


Re: Tek THS720 issues

John Gord
 

Raymond,
You are right, of course. Even if the THS720 does not charge the cells, unprotected cells might be over-discharged, causing possible safety problems which might not appear until they were charged later. Sometimes I try things that are not altogether safe.
--John Gord

On Tue, Aug 25, 2020 at 03:48 PM, Raymond Domp Frank wrote:


On Wed, Aug 26, 2020 at 12:31 AM, Carsten Bormann wrote:


If I recall correctly, the scope spots the higher voltage and does not
attempt
to charge the higher voltage cells. The protected cells should be safe even
if
the scope does attempt to charge.
Wouldn't using unprotected cells be risky, not just for the cells?

Raymond


Re: 2430 Self Test 9000 Trigs FAIL

Mike Harmon
 

I don't know how to connect a picture with a post, but if you click on 'Photos' on the left side of the page, it's the first pic to come up.
Mike


Re: 2430 Self Test 9000 Trigs FAIL

Siggi
 

On Tue, Aug 25, 2020 at 6:52 PM Raymond Domp Frank <hewpatek@gmail.com>
wrote:

On Wed, Aug 26, 2020 at 12:29 AM, Mike Harmon wrote:
I posted in the Photos section.
How about a link and/or the name of an album?
Here's a link to the album: https://groups.io/g/TekScopes/album?id=252676.

IIRC you can menu into the failing self test and get a breakdown of the
specific tests that are failing. Maybe that'll help...


Re: Tek THS720 issues

Carsten Bormann
 

On 2020-08-26, at 00:48, Raymond Domp Frank <hewpatek@gmail.com> wrote:

On Wed, Aug 26, 2020 at 12:31 AM, Carsten Bormann wrote:


If I recall correctly, the scope spots the higher voltage and does not attempt
to charge the higher voltage cells. The protected cells should be safe even if
the scope does attempt to charge.
Well, I didn’t write that, but:

Wouldn't using unprotected cells be risky, not just for the cells?
Yes, don’t do that. Generally, unless you can install additional protection circuitry, any retrofit of this kind needs to be done with protected cells.

26650s are available at around 5 Ah, giving a 7.4 V dual-cell battery a nice 37 Wh.
Even with 3200 mAh C-size cells, NiMH gives you some 15 Wh.

You just don’t get a useful battery indicator...

Grüße, Carsten


Re: 2430 Self Test 9000 Trigs FAIL

 

On Wed, Aug 26, 2020 at 12:29 AM, Mike Harmon wrote:


I posted in the Photos section.
How about a link and/or the name of an album?

Raymond


Re: Tek THS720 issues

 

On Wed, Aug 26, 2020 at 12:31 AM, Carsten Bormann wrote:


If I recall correctly, the scope spots the higher voltage and does not attempt
to charge the higher voltage cells. The protected cells should be safe even if
the scope does attempt to charge.
Wouldn't using unprotected cells be risky, not just for the cells?

Raymond


Re: Tek THS720 issues

Carsten Bormann
 

On 2020-08-26, at 00:27, John Gord via groups.io <johngord=verizon.net@groups.io> wrote:

If you make a battery tube with a side contact to match the scope battery contact, you can use 3 unprotected 18650 Li-ion cells or two protected cells plus a dummy spacer. The scope does not seem to mind the excess voltage, it just draws less current. If I recall correctly, the scope spots the higher voltage and does not attempt to charge the higher voltage cells. The protected cells should be safe even if the scope does attempt to charge.
Neat! I’ve got to try that. Would go for 26650, though.

Grüße, Carsten


2430 Self Test 9000 Trigs FAIL

Mike Harmon
 

I have had this scope for several weeks. Although I've been using scopes for 50+ years, this is my first software-controlled digital scope. When I got it, it stunk really bad like burned PCB when powered up. I found two yellow radial tantalums C181 and C182 on the A11 Timebase/Display board that were completely burned in two. I decided to just replace all the radial tantalums in the scope.

When I powered up the scope after the repairs, the scope went through the self-test and I got the display that I posted in the Photos section.

As I said earlier, I'm not the least bit familiar with the 2430 (I DO have the service manual), so I could really use some help as to where to go next. I'm not sure if it's a hardware or software problem, or how to tell the difference!

Thanks for any help you can give me!
Mike Harmon, WB0LDJ
mharmon at att dot net


Re: Tek THS720 issues

John Gord
 

Walter,
If you make a battery tube with a side contact to match the scope battery contact, you can use 3 unprotected 18650 Li-ion cells or two protected cells plus a dummy spacer. The scope does not seem to mind the excess voltage, it just draws less current. If I recall correctly, the scope spots the higher voltage and does not attempt to charge the higher voltage cells. The protected cells should be safe even if the scope does attempt to charge.
--John Gord

On Tue, Aug 25, 2020 at 12:53 PM, walter shawlee wrote:


I got one of these cuties on ebay (not expensive, it had bad batteries) and
was amazed when I opened the tek travel bag it was in, everything was covered
in sticky gray crumbled foam. what a total nightmare to clean...

I guess this is the deteriorated foam that once lined the bag, but wow, what a
sticky, horrible mess it made. it also really added to the screen mess, which
was scratched and marked. I managed to clean up the screen by carefully
polishing it with Novus 1 and 2 plastic polish, rags and Q-tips. Eventually
it was clean and readable. Novus is truly magical on plastic.

I tried to use the Tek wall wart power adaptor, but the cable was
intermittent, and it was still sticky from the foam so I tossed it and used
another generic 12V/1A adaptor (there is nothing special about it, just center
positive barrel plug), and ta-da, we have lift-off. It wouldn't charge the
batteries, so I opened the battery compartment and found somebody had soldered
together 4 C nicads, and tacked on that weird outer ring Tek used as the
bottom positive contact. Needless to say, all dead as door nails. I didn't
have any C nicads around, so I ordered some and am waiting for them to show
up, and I will try and re-create that goofy pack Tek had in there.

Incredibly, the scope and meter functions worked running from the wall wart.
The meter was bang on, and the scope is working, but I am not sure I
understand the control operation, changing timebase and vertical settings
seems to work very poorly, and getting the trigger to work is REALLY
difficult. Have to go through the manual again and see what I am doing wrong,
but it really made me long for some knobs and regular controls, rather than
on-screen nested menus. Am is being harsh, or this a really weak interface?

So at first blush, it looks to be workable, I just have to dig deeper into the
user-hostile interface and see what's going on, and get the batteries up and
running. Not unhappy for the small investment, although I am still finding
crumbled sticky foam everywhere in the lab. I found lots of docs for it on
line, which amazed me. Happy to hear from anybody with experience using this
unit as to any tips and tricks.I am guessing genuine Tek batteries are no
longer available...

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.








Re: Tek THS720 issues

 

On Tue, Aug 25, 2020 at 09:53 PM, walter shawlee wrote:


I tried to use the Tek wall wart power adaptor, but the cable was
intermittent, and it was still sticky from the foam so I tossed it and used
another generic 12V/1A adaptor (there is nothing special about it, just center
positive barrel plug), and ta-da, we have lift-off. It wouldn't charge the
batteries, so I opened the battery compartment and found somebody had soldered
together 4 C nicads, and tacked on that weird outer ring Tek used as the
bottom positive contact. Needless to say, all dead as door nails. I didn't
have any C nicads around, so I ordered some and am waiting for them to show
up, and I will try and re-create that goofy pack Tek had in there.
Hi Walter,
It takes a while getting used to these 'scopes.Do you make use of Auto Range for an initial set-up? I find the sluggishness of the user interface the main remaining annoyance.
When choosing a wall wart, choose a linear version, not a switching power supply. It's quite a bit heavier but it'll save you from looking for the source of that funny noise visible at high vertical sensitivities...
In my case, normal battery-like C-cells (the ones with the button on top) didn't fit; the result was too long. I decided to rebuild a battery using solder-together 3200 mAh NiMh cells. I re-used the original ring and used kapton tape and shrink tubing. Apart from the missing labeling, the result is a goofy Tek battery on steroids (much longer running time).

Raymond


Re: Tek 4041 GPIB Controller

Ke-Fong Lin
 

https://github.com/mmcgraw74/Tektronix-4041-GPIB-Controller/tree/master/GAMES
Hi Monty,

Very nice, only 142 lines of code!
Any plan for a YouTube video? Photos are great but videos better.

Best regards,


Re: Tek THS720 issues

amirb
 

You're kinda harsh on her (him!?) all handhelds use keys and push buttons and menus to change settings
in fact I like its interface better than my Fluke 199C. If you know your way around Tek digital scopes (such as TD3000 for example)
you easily find out that this scopemeter is very similar in organizing the menus and buttons.

All these scopes have home made batteries these days and mine did and I had to change them
fortunately in my case the previous owner didnt solder batteries together. They were just tucked in the plastic
tube that contained the original batteries. The whole thing barely holds together when I take it out but why do I need to take it out.

w.r.t. issues, the major problem with these scopes is the unusual DC offset that they develop. The best remedy seems to be
changing the two optocouplers (on each channel that has offset) and then calibrating the scope. In my case just calibrating the scope
solved the issue though. Calibration is very very easy but you need to remove a jumper from the inside before going to cal mode
but equipment requires is found on every bench.

*** Before anything try the self test and also SPC and see if they run without issues

The power analysis option can be enabled by removing a resistor on the board !

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