Re: 4-pin Lemo connector used on end of cable for 4041 PD keyboard
Raymond: Thank you for all the trouble you are going thru. If the connector is the correct one (it is only about 5/16" diameter with a "D"-shaped 4-pin insulator inside), name your price and I will pay through any means you desire. I will contact you in a day or so to remind you of my needs. Bye for now. Gary On Sat, Aug 29, 2020 at 3:54 PM Raymond Domp Frank <hewpatek@...> wrote: On Sun, Aug 30, 2020 at 12:38 AM, Gary Robert Bosworth wrote:
I need to purchase the connector used on the end of the cable of the PD
keyboard that attaches to the front panel of the 4041. It looks like a
4-pin
LEMO round silver connector. I cannot find this part listed even on the
keyboard's manual listings.
If it's the same as the power connector for FET probes, I probably have
one for you, could be NOS. Also, if its diameter is bigger than the
FET-ones.
I have a 4041 in the lab and will be there on Monday and check 4041 and
plug availability. Remind me Tuesday if I don't respond with details if I
forget - and if you want.
Would have to be shipped from the Netherlands, price to be determined but
not ridiculous: make me an offer if we get there.
Raymond
-- Gary Robert Bosworth grbosworth@... Tel: 310-317-2247
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Re: 5441 rack / bench conversion document
From Tim P (UK)
Many thanks for that - as I suspected, it is necessary to unsolder the
delay line and re-attach to the interface board. :-(
Otherwise a topological conundrum involving a fourth (spacial) dimension
!!!
Tim
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On Mon, 31 Aug 2020 at 16:04, zenith5106 <hahi@...> wrote: On Sun, Aug 30, 2020 at 08:29 PM, Tim Phillips wrote:
Does anyone (Hakan?) have the documents detailing the conversion
between rack / bench formats ?
They are here now:
They are scanned from microfiche using a photo scanner so unfortunately
the quality
doesn't get any better than that, sorry.
/H?kan
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Re: Tektronix TDS3PRT Printer
Since a previous message to this group I have been seeking an explanation for the scarcity of of available information on tthe TDS3PRT printer and the reason for its discontinuance. I have been hoping to find the manual or instructions furnished with this printer and any software that might have been furnished with it. What I have learned so far is that according to a Wikipedia article:
"Reports began surfacing in the 2000s finding the oestrogen-related chemical bispheonol A ("BPA") [is] mixed in with thermal (and some other) papers. While the health concerns are very uncertain, various health and science oriented political pressure organizations such as the Environmental Working Group have pressed fro these versions to be pulled from market." This may be the explanation.
The TDS3PRT printers bear Sony/Tektronix labels with J prefixes. A source confirmed they were manufactured by Sony. Sony has manufactured several high-quality thermal printer models for medical applications such as ultrasound scans. Another source indicated the TDS3PRT used 110 mm paper rolls. Sony also employed this width paper rolls in their printers and offered at least three grades from normal to highly glossy, UPP-110S, UPP-110HD, and UPP-110HG. These remain available from eBay and Amazon sources and may be compatible with the Tektronix printer. I have not found any source for the Tektronix 016-1907-00 paper (5 rolls).
Sony, being the manufacturer, may have nixed public release of the manuals. One former seller mentioned the manual was available on apexwaves.com, but the file has apparently been pulled down.
Are any of these printers to be found in the hands of members of this group? Can anyone provide further information, particularly a source for the manual?
Bruce, KG6OJI
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Re: 5441 rack / bench conversion document
On Sun, Aug 30, 2020 at 08:29 PM, Tim Phillips wrote:
Does anyone (Hakan?) have the documents detailing the conversion between rack / bench formats ?
They are here now: They are scanned from microfiche using a photo scanner so unfortunately the quality doesn't get any better than that, sorry. /H?kan
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Re: TDS3054 Replacement of DALLAS DS1742W (U640), data content in NV-RAM
A DS1742W from China? Chances are really high it's a counterfeit. Here's an eevblog thread that has some pictures of a China fake vs real:
The dimensions are a giveaway, at least on that one.
Further in that thread, there's a link to someone who made an adapter board for a DS1744WP, which is still available from reputable sources (Mouser, Digikey, etc). Functionally, it's the same as the DS1742W, but with more SRAM that would never be accessed. The adapter board fits TDS3000 scopes.
I ended up doing surgery on my old DS1742W to connect an external battery. I'd recommend not throwing away your old DS1742W, and install a DIP socket.
-mark
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Re: Tek 7854 intermittent issues
On Mon, Aug 31, 2020 at 01:12 AM, Nick Corvid wrote: And in response to Albert, you are correct that it's missing
chunks of the horizontal in dots mode, or were until I had set up my camera to
take pictures and the behavior changed again.(this thing is making me crazy!)
Leading to these pictures:
Vector mode: /g/TekScopes/photo/252782/1?p=Created,,,20,2,0,0
Dots mode: /g/TekScopes/photo/252782/0?p=Created,,,20,2,0,0
Hi Nick, the dot pattern is not what I expected. It seems that still linear interpolation is done to fill missing horizontal positions. I expected to see no dots at all during some wide horizontal gaps. Anyway, in my opinion it's clear that data are missing. In your new photos there is also a negative outlier and, very strange, a negative trace near the end of the sweep which looks like a inverted portion of the correct waveform. In the correct waveform the rising edges end more or less rounded while the falling edges are sharp. Wrong sign bit? I thought I would see horizontal gaps when I do a too fast single sweep acquisition. But my 7854 simply refuses AQS with a nasty beep. Albert
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Re: Strange Tek2440 issue
100nsec per div and faster sounds like the switch from real time sampling to equivalent time interpolation (300Msample/sec real time). You can turn off the equivalent time mode by going to the Acquire menu and setting 'Repet' to Off. If that enables you to get to faster sweep speeds then the problem is clearly in the circuitry that does the equivalent time interpolation but I would need a thorough read of the manual to go into any detail!
Regards,
Roger
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HC100 Plotter - gpib interface board wanted
Hi,
I own the HC100 plotter with the RS232 option.
I'd be happy to swap this for the GPIB option if anyone out there has
one they don't want. Sorry I don't know the part # -- it doesn't seem to
be in the manual. Pens would also be of interest.
Thanks
--Toby
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Re: Tek 7854 intermittent issues
Q141, sheet <11> coordinates E2. The other transistor in the clamp is Q41,
coordinates E5.
Dave Casey
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Show quoted text
On Sun, Aug 30, 2020 at 6:12 PM Nick Corvid <awsomedrack@...> wrote: Thank you for the suggestion Dave, I'll have a look at where the power
supply points are located in the manual and see if anything seems out of
spec when I'm next able. And in response to Albert, you are correct that
it's missing chunks of the horizontal in dots mode, or were until I had set
up my camera to take pictures and the behavior changed again.(this thing is
making me crazy!) Leading to these pictures:
Vector mode:
/g/TekScopes/photo/252782/1?p=Created,,,20,2,0,0
Dots mode:
/g/TekScopes/photo/252782/0?p=Created,,,20,2,0,0
Some of the issues can be found in analog modes, but usually only very
intermittently, for example the trace jittering horizontally even with a
solid trigger (and the intensity for the A time-base but I'm pretty sure
that is just a dirty pot). Also this may be unrelated as I don't know
exactly what operating as intended is but one of the transistors on what I
am fairly certain is the horizontal amp board can get very hot to the touch
while the others stay cool when the machine has been running for over 10
minutes.
This is the transistor in question:
/g/TekScopes/photo/252782/2?p=Created,,,20,2,0,0 .
Haven't had the time to find where it lives on the circuit diagram
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Re: Tek 7854 intermittent issues
Thank you for the suggestion Dave, I'll have a look at where the power supply points are located in the manual and see if anything seems out of spec when I'm next able. And in response to Albert, you are correct that it's missing chunks of the horizontal in dots mode, or were until I had set up my camera to take pictures and the behavior changed again.(this thing is making me crazy!) Leading to these pictures: Vector mode: /g/TekScopes/photo/252782/1?p=Created,,,20,2,0,0 Dots mode: /g/TekScopes/photo/252782/0?p=Created,,,20,2,0,0 Some of the issues can be found in analog modes, but usually only very intermittently, for example the trace jittering horizontally even with a solid trigger (and the intensity for the A time-base but I'm pretty sure that is just a dirty pot). Also this may be unrelated as I don't know exactly what operating as intended is but one of the transistors on what I am fairly certain is the horizontal amp board can get very hot to the touch while the others stay cool when the machine has been running for over 10 minutes. This is the transistor in question: /g/TekScopes/photo/252782/2?p=Created,,,20,2,0,0 . Haven't had the time to find where it lives on the circuit diagram
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Re: Strange Tek2440 issue
Szabolcs, from here (TekScopes) posted a method of accessing the internal battery of the Dallas NVRAM modules using a heat gun and a scraper. The difference in these modules was that there were two batteries that were visible. Anyway I scraped down to pin 7 of the DS1210 and soldered a wire to it on each module. I ran those to a small circuit board where I had a battery holder and two diodes on it. The diodes fed the voltage to each of the modules.
When I put it back together it didn't work. Then I noticed I forgot to plug in one of the ribbon cables!
Anyway, the subject for the post I mentioned above is:
Easy method for NVRAM battery replacement
Vince.
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Show quoted text
On 08/30/2020 05:53 PM, Bob Albert via groups.io wrote: Not your current problem but I replaced the NVRAM chips in my 2440 and the scope doesn't work. I switched one of them back and still no joy. I will try the other one.
I probably got some counterfeit modules from China. I am hoping it will be fixed when I put the old one back. How did you fix yours?
Bob
On Sunday, August 30, 2020, 02:37:52 PM PDT, Vince Vielhaber <vev@...> wrote:
I picked up a 2440 on ebay that had the dead nvram battery problem. Got
that fixed up with an external battery. Ran thru the self cal and ext
cal and all seems fine, except when the sweep rate is turned above 100
or 200 ns.
In trying to research this a bit, the only thing I could find was on one
of the Tek forums back in 2017 but there were zero responses. Here is
how the other person described the problem:
---------------------------------------------------------------------
The 5 volt regulated rail is getting crowbared when the scope Sec/Div is
set to 100ns or faster. If save is pressed at a slower setting the
Sec/Div can then be set to any value without the 5 Volt rail getting
pulled down. It appears the issue only occurs during an active
acquisition cycle at 100ns Sec/Div or faster.
----------------------------------------------------------------------
While I didn't measure the 5v rail, the screen shrinks a couple of times
as the waveform changes, the inputs get switched to GND and the display
goes blank. Sometimes, if I'm quick enough, I can turn the sweep back
down (1us or slower) and it'll recover, but I still have to go to the
input coupling and switch the inputs off of GND.
Anyone seen this or have any ideas what's going on?
Thanks!
Vince.
--
K8ZW
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Re: Strange Tek2440 issue
Not your current problem but I replaced the NVRAM chips in my 2440 and the scope doesn't work.? I switched one of them back and still no joy.? I will try the other one.
I probably got some counterfeit modules from China.? I am hoping it will be fixed when I put the old one back.? ?How did you fix yours?
Bob
toggle quoted message
Show quoted text
On Sunday, August 30, 2020, 02:37:52 PM PDT, Vince Vielhaber <vev@...> wrote:
I picked up a 2440 on ebay that had the dead nvram battery problem.? Got
that fixed up with an external battery.? Ran thru the self cal and ext
cal and all seems fine, except when the sweep rate is turned above 100
or 200 ns.
In trying to research this a bit, the only thing I could find was on one
of the Tek forums back in 2017 but there were zero responses.? Here is
how the other person described the problem:
---------------------------------------------------------------------
The 5 volt regulated rail is getting crowbared when the scope Sec/Div is
set to 100ns or faster. If save is pressed at a slower setting the
Sec/Div can then be set to any value without the 5 Volt rail getting
pulled down. It appears the issue only occurs during an active
acquisition cycle at 100ns Sec/Div or faster.
----------------------------------------------------------------------
While I didn't measure the 5v rail, the screen shrinks a couple of times
as the waveform changes, the inputs get switched to GND and the display
goes blank.? Sometimes, if I'm quick enough, I can turn the sweep back
down (1us or slower) and it'll recover, but I still have to go to the
input coupling and switch the inputs off of GND.
Anyone seen this or have any ideas what's going on?
Thanks!
Vince.
--
? K8ZW? ?
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I picked up a 2440 on ebay that had the dead nvram battery problem. Got that fixed up with an external battery. Ran thru the self cal and ext cal and all seems fine, except when the sweep rate is turned above 100 or 200 ns.
In trying to research this a bit, the only thing I could find was on one of the Tek forums back in 2017 but there were zero responses. Here is how the other person described the problem:
---------------------------------------------------------------------
The 5 volt regulated rail is getting crowbared when the scope Sec/Div is set to 100ns or faster. If save is pressed at a slower setting the Sec/Div can then be set to any value without the 5 Volt rail getting pulled down. It appears the issue only occurs during an active acquisition cycle at 100ns Sec/Div or faster.
----------------------------------------------------------------------
While I didn't measure the 5v rail, the screen shrinks a couple of times as the waveform changes, the inputs get switched to GND and the display goes blank. Sometimes, if I'm quick enough, I can turn the sweep back down (1us or slower) and it'll recover, but I still have to go to the input coupling and switch the inputs off of GND.
Anyone seen this or have any ideas what's going on?
Thanks!
Vince.
--
K8ZW
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5441 rack / bench conversion document
from Tim P (UK)
Does anyone (Hakan?) have the documents detailing the conversion between
rack / bench formats ? they are 040-0583-02 and 040-0584-03
I don't see how to do it without unsoldering the delay line.
thanks
Tim
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Re: Tek 4654M; No Trace, No +5V, No +95V; Help
Slight correction. From the manual, it appears TP60 (et. al.) has a 28uS period making that about 38kHz instead of 30kHz.
Thanks,
Barry - N4BUQ
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Show quoted text
----- Original Message ----- From: "Barry" <n4buq@...>
To: [email protected]
Sent: Sunday, August 30, 2020 11:21:43 AM
Subject: Re: [TekScopes] Tek 4654M; No Trace, No +5V, No +95V; Help
Harrison,
If you suspect the multiplier is bad, you can disconnect its input by
unsoldering the wire to the transformer. You can see that in the the
picture of the HV board that I added just now here:
/g/TekScopes/album?id=252850
If I remember correctly, you have to be somewhat careful that the wire is not
close enough to arc back to the transformer. I remember that happening and
had to move it a bit further away so that I could have the rest of the HV
circuit operating but not engage the multiplier. If you have a meter that
can measure the output of the transformer (I forget the output value but it
would theoretically be 1/3 of the anode voltage and it's at around 30kHz as
I recall), then you might could establish that everything else works up to
that point.
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "n4buq" <n4buq@...>
To: [email protected]
Sent: Sunday, August 30, 2020 10:32:17 AM
Subject: Re: [TekScopes] Tek 4654M; No Trace, No +5V, No +95V; Help
Hi Harrison,
Yes, the 3x multiplier is U550. For mine, even after I replaced it, I did
some testing on it and, at lower voltages, it would triple the input
voltage; however, it appeared that at operating voltage, it would arc
internally thus blowing the fuse. If I'm not mistaken, this is a common
failure for that module after all these years.
There's a thread on/around October 7, 2017, where the messages for that can
be found.
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "Harrison" <buma7@...>
To: [email protected]
Sent: Sunday, August 30, 2020 9:10:37 AM
Subject: Re: [TekScopes] Tek 4654M; No Trace, No +5V, No +95V; Help
Barry; When you stated you replaced the multiplier, are you saying you
replaced the U550 module? Harrison N1FAM
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Re: TDS3054 Replacement of DALLAS DS1742W (U640), data content in NV-RAM
you can just throw in a completely blank chip in there, no problem
reading the old chip and writing in the new one doesn't do much and doesn't do any harm either as I have learned...specially now that the # of hours is messed up
the number of hours are stored in minutes (in HEX) at 07E0-07E3 and also at 07E8-07EB (the same number repeated)
that's probably the only thing you need
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Re: Free 6 pin lemo cable and THS720 question
As far as I know, there is no menu accessible way to see the battery condition on the THS720. I think that got added to the THS730, but that may be wishful recollection on my part.
One usability issue on the THS720 that is worth keeping in mind is that the two input channels do not share a ground. For low speed stuff with other scopes, I commonly just ground an unused input channel to the board under test and then wrap the ground lead of the probe that I am using arount the probe cable to keep it out ot the way. That does not work on the THS720! Each input channel must have it's own ground connection.
The THS720 is a really handy little scope! I like mine a lot. Thanks for the article on building the battery packs!
BobH
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TDS3054 Replacement of DALLAS DS1742W (U640), data content in NV-RAM
Hello all,
a TDS3054 (built in year 2001) shows the following symptoms when connected to power:
- 'A system error has occured', Error Count =11, 'display error', goes away after short power off/on
- Unrealistic high 'total operation time' (16350105 hours)
- Impossible time setting (e.g. '11:80:21')
Topic #157465 also deals with this issue, the problem is data corruption inside
U640 DALLAS DS1742W, exhausted lithium battery, date code on the
package is '0029'.
I ordered replacement DS1742W via Amazon in China (the chips I received seem fully functional when
tested on a programmer), date code on the package is '0945'.
How should I prepare the new DS1742W I am going to install in the scope?
Simply read out the (most probably) rubbish of the old DS1742W and copy
it to the new one?
Is a memory map available somewhere which shows the addresses of the
relevant memory locations and their expected content in a working scope?
(the address locations 0x7F8...0x7FF are described in the DS1742W data
sheet)
I cannot believe that appr. 2k of memory are fully used to store internal scope
status data.
Thanks for any help!
Best regards
-Roland
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Re: Tek 4654M; No Trace, No +5V, No +95V; Help
Harrison, If you suspect the multiplier is bad, you can disconnect its input by unsoldering the wire to the transformer. You can see that in the the picture of the HV board that I added just now here: /g/TekScopes/album?id=252850If I remember correctly, you have to be somewhat careful that the wire is not close enough to arc back to the transformer. I remember that happening and had to move it a bit further away so that I could have the rest of the HV circuit operating but not engage the multiplier. If you have a meter that can measure the output of the transformer (I forget the output value but it would theoretically be 1/3 of the anode voltage and it's at around 30kHz as I recall), then you might could establish that everything else works up to that point. Thanks, Barry - N4BUQ
----- Original Message ----- From: "n4buq" <n4buq@...>
To: [email protected]
Sent: Sunday, August 30, 2020 10:32:17 AM
Subject: Re: [TekScopes] Tek 4654M; No Trace, No +5V, No +95V; Help
Hi Harrison,
Yes, the 3x multiplier is U550. For mine, even after I replaced it, I did
some testing on it and, at lower voltages, it would triple the input
voltage; however, it appeared that at operating voltage, it would arc
internally thus blowing the fuse. If I'm not mistaken, this is a common
failure for that module after all these years.
There's a thread on/around October 7, 2017, where the messages for that can
be found.
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "Harrison" <buma7@...>
To: [email protected]
Sent: Sunday, August 30, 2020 9:10:37 AM
Subject: Re: [TekScopes] Tek 4654M; No Trace, No +5V, No +95V; Help
Barry; When you stated you replaced the multiplier, are you saying you
replaced the U550 module? Harrison N1FAM
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Gary Robert Bosworth
ebrucehunter
zenith5106