Date   
Re: 497P power supply aluminum spacers???

Chuck Harris
 

They either keep the PC boards separated, or keep the
aluminum cover from being crushed. They should show up
in the parts blowup... if you can find them.

I recall that they are under the circuit board, and hold
it off of the inner chassis.

-Chuck Harris

radioconnection@... wrote:

Just started recapping my 497P power supply... I found two sets of about 1/4" aluminum spacers after removing the board. One pair are close to 6-32, the other pair are close to 4-40 hole size. I can see where one pair is used, but I am baffled as to where the other pair was used.

Pete



Re: Weird(?) behaviour in tek 492BP power distribution - Please help

 

Hi folks, thank you for the replies.
I am using a Fluke 87V to make the measurements and it has been reliable up to now.
The voltages returned to the expected values when the HV supply board and the Deflection Amplifier board (A64; PN:671-0372- ) are removed from the instrument.
It is connected to the +300V power rail, but I could not find any connection to the +100V power rail.
I will check the semiconductors on this board while I am waiting for the HV power supply to arrive.
Maybe the +100V returns to normal if I find what is causing the +300V to go low.
It took me a looong time to figure out to use the 494 manuals to find information on boards similar to the ones installed in my instrument ( S/N: B030799).
I got the idea after reading another thread on this forum about the "evolution" of the 49x SA line.
Is there a common failure on the deflection board that I should check first?
Regards,
Roger

Re: 7B92A time-base plug-in odd behaviour

Roger Evans
 

Colin,
Can you not eliminate the mechanically operated switches eg S490 by either removing the single wire from its mating pin or solidly jumpering it to ground so that it is definitely open or definitely closed and should not change on warm up?

It looks like S800 should only affect the readout but you can check with the 'theory of operation' in the manual.

Roger

Re: Corona Electric FT-100A

Morris Odell
 

I have one of these and I’ll be glad to photograph it for you. If anyone
has some info about it I’d be very grateful. I’m out of town for the next
couple of weeks but when I get back I’ll let you know.

Cheers,

Morris

Re: TDS744 not 'A' has a problem , help needed

Stephen Hanselman
 

I suspect you have a better shot at it than I did. One other thing when setting up the PC set files and buffers up a good bit also add some more memory above the base 640K. also the config file for the cal software has a line that alleges to define the place it looks for the HPIB card. It has two possible "places", I'll look later, and you need to put the card info into both of them. This even happened on my Tek DM system.


Have you got the cal program files?

steve

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Brian via Groups.Io
Sent: Thursday, May 30, 2019 1:06 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] TDS744 not 'A' has a problem , help needed

Hi Steve , thank you for that . I have heard several ideas about the NVRAM contents , one is said to hold just saved waveforms and setups and the other holding cal data and installed options , cant remember which is said to do what so I'll need to search EEblog again . I have heard it said also that there are a couple of NVRAM chips underneath the acquisition pcb , little 8 pin chips , that hold factory cal data but that it is only a copy of one of the Dallas chips and is there for emergency's for use at a cal center , those 2 chips are there even on my non A version . The same source if I remember correctly said that the system does not actually use this data it relies on the Dallas chip .
I have a Fluke DC calibrator and 6.5,7.5 and 8.5 digit DVM's. Signal generators , I have synthesized gen's up to 18GHz but their output is too low , but I do have a couple of small 1MHz - 5GHz amps with output up to 20dBm that might make it possible . the final output will not be levelled directly but the input will be , to make certain I do have HP438A power meter and sensors , I also have a RACAL true RMS voltmeter that is good to 2GHz .Unlike some here I do have several old PC's with windows 95/98 could even run windows 3.11 , I have also the NI PC2A GPIB cards and drivers and a copy of the cal s/w

I am in the UK if you hadnt guessed so I think we are more than just a few miles apart or I would be happy to join you for that after school project Brian

On Thursday, 30 May 2019, 20:32:31 BST, Stephen Hanselman <kc4sw.io@...> wrote:

I've heard the talk flow both ways but to my knowledge the calibration data is held in NVRAM on the Acquisition pca not in the Proc. I've looked in several of the Dallas Chips and mostly what you see is empty space. I suspect, but have no proof, that these things are used to store trace data. I have taken non-working (fails SPC etc) and swapped in working calibrated Acq and had it remember it's calibration data.

Calibration requirements are actually fairly lax. You need a good, accurate DC source, DMM, and after that almost any reasonable sig gen would work. I have SG503 and SG504 the scope tells you if the particular signal you are looking at from the "SG's" is correct and then goes off and calibrates itself. The initial DC calibrations are critical however. The las thing is a HPIB based controller to run the test suite. I tried several incarnations and finally bought a Tek Data Manager. Given no experience and all manual TE I would plan on a full day for the cal, and be prepared to become extremely bored.

If you look at your diagnostics screen where it shows SPC, Voltage ref, Frequency...... there are 4 states Initialized (after cold start), running, passed, failing. I found out the hard way that even when you pass the CVR testing voltage ref may say "running" although not next in the sequence you have to run probe comp to get it to read "passing" there are a few other gotchas in the software similar to this.

If you were close by I'd tell you to bring it in as an afterschool project, but...

Hope this helps you a bit. Like they say though, your mileage may vary

steve

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Brian via Groups.Io
Sent: Thursday, May 30, 2019 8:19 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] TDS744 not 'A' has a problem , help needed

Hi Stephen , fortunately the scope remembers the date and the clock is running fine . I have NVRAM back-up s/w from EEBLOG so hopefully it will keep a record of the contents assuming it works on the much older scopes but I cant see why it shouldnt . I do have some GPIB experience and enough gear to connect to the scope .The scope does have nice options for me 13,1f,2f,2m so I dont really want to loose any of themThe Dallas chips are DS1650Y and DS1486 , I understand that one of them holds calibration data - I dont know that even with the gear I have a complete recalibration would be possible so I need to keep that info as intact as possible for as long as I can . Any calibration equipment that I dont currently have will take time to get hold of as I am retired and only a hobbyist/collector .

On Thursday, 30 May 2019, 16:03:41 BST, Stephen Hanselman <kc4sw.io@...> wrote:

Brian,

Changing out these chips is not really a problem. While they do keep some scope specific info I’ve operated 540A’s without the chip. If you have a vanilla model, no options I’m not sure it’s worth the effort. EBay, yes I know, has some replacements, when you look at the offerings look for one that has a “+” in the part number. So it seems like these are newer ones. The Tek forum has a thread that gives the cross wiring needed to program the Dallas chip in a more common NVRAM environment.

On the other hand if your scope remembers the date and time the chip is probably ok, for a while.

My technique is to add fresh solder to each pin and then heat the pin, not the board, and suck it out. I then insert a socket. So far I have not had an issue with losing data in the chip.

As it stands I have good images for the 540, 540A, and 540B.

Regards,

Stephen Hanselman
Datagate Systems, LLC
3107 North Deer Run Road #24
Carson City, Nevada, 89701
(775) 882-5117 office
(775) 720-6020 mobile
s.hanselman@...
www.datagatesystems.com
a Service Disabled, Veteran Owned Small Business
DISCLAIMER:
This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.
On May 30, 2019, at 07:53, Brian via Groups.Io <brianas1948=yahoo.co.uk@groups.io> wrote:

Hi Bob , thank you . That was only the second one of those scopes I've had anything to do with , I am mostly 500 series + 661 and 564 along with 7000 series and 24XX . My first one was a TDS420A with a dead PSU , changing the caps revived it , nothing else was wrong with it . The TDS744 was also one that did not start up , after sorting out the PSU the other faults showed themselves , it was the first time fixing a component level fault on an acquisition pcb . I now have to do something about the Dallas chips they are dated '93!!

On Thursday, 30 May 2019, 15:26:46 BST, Bob Koller via Groups.Io <testtech=yahoo.com@groups.io> wrote:

Well done!




Re: TDS744 not 'A' has a problem , help needed

Brian
 

Hi Steve , how strange it needs the info in both places , I'll make notes so I dont forget that . I do have extended memory cards for the old PC's but I think I am likely to use windows 95/98 when I get around to doing this and then I'm sure it can use virtual memory on the hard disk if there is not enough main memory - I still have copies of s/w like ramdoubler if things get desperate .I have copies of the cal s/w from a guy on EEblog who put up the files for 500,600,700 series scopes , I have not run them yet so I hope there are no problems .Can the whole process be done manually as I am more likely to try that because the instruments I have are almost certainly not compatible with the GPIB cal s/w , some do not have a GPIB port at all .
Its good to speak to someone who has done it as it makes it feel so much more possible for me to do it
Brian

On Thursday, 30 May 2019, 21:58:02 BST, Stephen Hanselman <kc4sw.io@...> wrote:

I suspect you have a better shot at it than I did.  One other thing when setting up the PC set files and buffers up a good bit also add some more memory above the base 640K.  also the config file for the cal software has a line that alleges to define the place it looks for the HPIB card.  It has two possible "places", I'll look later, and you need to put the card info into both of them.  This even happened on my Tek DM system.


Have you got the cal program files?

steve

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Brian via Groups.Io
Sent: Thursday, May 30, 2019 1:06 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] TDS744 not 'A' has a problem , help needed

Hi Steve , thank you for that . I have heard several ideas about the NVRAM contents , one is said to hold just saved waveforms and setups and the other holding cal data and installed options , cant remember which is said to do what so I'll need to search EEblog again . I have heard it said also that there are a couple of NVRAM chips underneath the acquisition pcb , little 8 pin chips , that hold factory cal data but that it is only a copy of one of the Dallas chips and is there for emergency's for use at a cal center , those 2 chips are there even on my non A version . The same source if I remember correctly said that the system does not actually use this data it relies on the Dallas chip .
I have a Fluke DC calibrator and 6.5,7.5 and 8.5 digit DVM's. Signal generators , I have synthesized gen's up to 18GHz but their output is too low , but I do have a couple of small  1MHz - 5GHz amps with output up to 20dBm that might make it possible . the final output will not be levelled directly but the input will be , to make certain I do have HP438A power meter and sensors , I also have a RACAL true RMS voltmeter that is good to 2GHz .Unlike some here I do have several old PC's with windows 95/98 could even run windows 3.11 , I have also the NI PC2A GPIB cards and drivers and a copy of the cal s/w

I am in the UK if you hadnt guessed so I think we are more than just a few miles apart or I would be happy to join you for that after school project Brian

    On Thursday, 30 May 2019, 20:32:31 BST, Stephen Hanselman <kc4sw.io@...> wrote:

I've heard the talk flow both ways but to my knowledge the calibration data is held in NVRAM on the Acquisition pca not in the Proc.  I've looked in several of the Dallas Chips and mostly what you see is empty space.  I suspect, but have no proof, that these things are used to store trace data.  I have taken non-working (fails SPC etc) and swapped in working calibrated Acq and had it remember it's calibration data.

Calibration requirements are actually fairly lax.  You need a good, accurate DC source, DMM, and after that almost any reasonable sig gen would work.  I have SG503 and SG504 the scope tells you if the particular signal you are looking at from the "SG's" is correct and then goes off and calibrates itself.  The initial DC calibrations are critical  however.  The las thing is a HPIB based controller to run the test suite.  I tried several incarnations and finally bought a Tek Data Manager.  Given no experience and all manual TE I would plan on a full day for the cal, and be prepared to become extremely bored.

If you look at your diagnostics screen where it shows SPC, Voltage ref, Frequency...... there are 4 states Initialized (after cold start), running, passed, failing.  I found out the hard way that even when you pass the CVR testing voltage ref may say "running"  although not next in the sequence you have to run probe comp to get it to read "passing"  there are a few other gotchas in the software similar to this.

If you were close by I'd tell you to bring it in as an afterschool project, but...

Hope this helps you a bit.  Like they say though, your mileage may vary

steve

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Brian via Groups.Io
Sent: Thursday, May 30, 2019 8:19 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] TDS744 not 'A' has a problem , help needed

Hi Stephen , fortunately the scope remembers the date and the clock is running fine . I have NVRAM back-up s/w from EEBLOG so hopefully it will keep a record of the contents assuming it works on the much older scopes but I cant see why it shouldnt . I do have some GPIB experience and enough gear to connect to the scope .The scope does have nice options for me 13,1f,2f,2m so I dont really want to loose any of themThe Dallas chips are DS1650Y and DS1486 , I understand that one of them holds calibration data - I dont know that even with the gear I have a complete recalibration would be possible so I need to keep that info as intact as possible for as long as I can . Any calibration equipment that I dont currently have will take time to get hold of as I am retired and only a hobbyist/collector .

    On Thursday, 30 May 2019, 16:03:41 BST, Stephen Hanselman <kc4sw.io@...> wrote:

Brian,

Changing out these chips is not really a problem. While they do keep some scope specific info I’ve operated 540A’s without the chip.  If you have a vanilla model, no options I’m not sure it’s worth the effort.  EBay, yes I know, has some replacements, when you look at the offerings look for one that has a “+” in the part number. So it seems like these are newer ones. The Tek forum has a thread that gives the cross wiring needed to program the Dallas chip in a more common NVRAM environment.

On the other hand if your scope remembers the date and time the chip is probably ok, for a while.

My technique is to add fresh solder to each pin and then heat the pin, not the board, and suck it out.  I then insert a socket.  So far I have not had an issue with losing data in the chip.

As it stands I have good images for the 540, 540A, and 540B.

Regards,

Stephen Hanselman
Datagate Systems, LLC
3107 North Deer Run Road #24
Carson City, Nevada, 89701
(775) 882-5117 office
(775) 720-6020 mobile
s.hanselman@...
www.datagatesystems.com
a Service Disabled, Veteran Owned Small Business
DISCLAIMER:
This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.
On May 30, 2019, at 07:53, Brian via Groups.Io <brianas1948=yahoo.co.uk@groups.io> wrote:

Hi Bob , thank you . That was only the second one of those scopes I've had anything to do with , I am mostly 500 series + 661 and 564 along with 7000 series and 24XX .  My first one was a TDS420A with a dead PSU , changing the caps revived it , nothing else was wrong with it . The TDS744 was also one that did not start up , after sorting out the PSU the other faults showed themselves , it was the first time fixing a component level fault on an acquisition pcb . I now have to do something about the Dallas chips they are dated '93!!

    On Thursday, 30 May 2019, 15:26:46 BST, Bob Koller via Groups.Io <testtech=yahoo.com@groups.io> wrote:

Well done!




Re: Chassis for free

David Berlind
 

Before these go into the trash heap, I am looking for a chip that goes into
the PCB at the back of slot 1 on a 7603 chassis with the marking:

155 0022 00
733 542 USA

I would greatly appreciate it if anyone is willing to spare that chip.

Thank you!

On Wed, May 29, 2019 at 7:34 PM Jim Ford <james.ford@...> wrote:

Yep, I know the feeling! My wife does not, however...Thanks
anyway. JimSent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Dave Seiter <d.seiter@...>
Date: 5/29/19 3:27 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re:
[TekScopes] Chassis for free Hi Jim- No, even though I have extras, I never
know when I'll need them😉. -Dave> On May 29, 2019, at 3:01 PM, Jim Ford <
james.ford@...> wrote:> > Hi, Dave.Any 7k, 5k, or TM500 series
plug-ins you'd like to have a new home? Shipping is a lot less of an
ordeal for those. I'm in So Cal, so shipping should be inexpensive - I
will pay.Thanks.Jim Ford Sent from my Verizon, Samsung Galaxy smartphone>
-------- Original message --------From: Dave Seiter <d.seiter@...>
Date: 5/29/19 2:03 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re:
[TekScopes] Chassis for free That's a great idea, but I have boxes of
plugins (and those are the ones I don't use!)-Dave On Wednesday, May 29,
2019, 1:59:52 PM PDT, zenith5106 <hahi@...> wrote: On Wed, May 29,
2019 at 10:31 PM, Dave Seiter wrote:>> I have at least 4 chassis from x3
mainframes that are taking up space>Here's a tip what you can do with empty
7k frames .... http://www.hakanh.com/dl/pi_storage.htm/Håkan> >


Re: Chassis for free

Dave Seiter
 

I saved everything else from these scopes that wasn't broken, so I probably have the chip...  ...somewhere.  Let me see if I can dig one up.
-Dave

On Thursday, May 30, 2019, 3:22:19 PM PDT, David Berlind <david@...> wrote:

Before these go into the trash heap, I am looking for a chip that goes into
the PCB at the back of slot 1 on a 7603 chassis with the marking:

155 0022 00
733 542 USA

I would greatly appreciate it if anyone is willing to spare that chip.

Thank you!

Re: TDS744 not 'A' has a problem , help needed

Stephen Hanselman
 

Brian,

I have a 540 waiting for me after the 8566 and 8662. Yes the process can be done manually. It’s sort of amusing that they imply automatic, but their equipment call out is all manual.

I’ll try and get my system up on Friday and get the configurations I use

Regards,

Stephen Hanselman
Datagate Systems, LLC
3107 North Deer Run Road #24
Carson City, Nevada, 89701
(775) 882-5117 office
(775) 720-6020 mobile
s.hanselman@...
www.datagatesystems.com
a Service Disabled, Veteran Owned Small Business
DISCLAIMER:
This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.

On May 30, 2019, at 14:29, Brian via Groups.Io <brianas1948=yahoo.co.uk@groups.io> wrote:

Hi Steve , how strange it needs the info in both places , I'll make notes so I dont forget that . I do have extended memory cards for the old PC's but I think I am likely to use windows 95/98 when I get around to doing this and then I'm sure it can use virtual memory on the hard disk if there is not enough main memory - I still have copies of s/w like ramdoubler if things get desperate .I have copies of the cal s/w from a guy on EEblog who put up the files for 500,600,700 series scopes , I have not run them yet so I hope there are no problems .Can the whole process be done manually as I am more likely to try that because the instruments I have are almost certainly not compatible with the GPIB cal s/w , some do not have a GPIB port at all .
Its good to speak to someone who has done it as it makes it feel so much more possible for me to do it
Brian

On Thursday, 30 May 2019, 21:58:02 BST, Stephen Hanselman <kc4sw.io@...> wrote:

I suspect you have a better shot at it than I did. One other thing when setting up the PC set files and buffers up a good bit also add some more memory above the base 640K. also the config file for the cal software has a line that alleges to define the place it looks for the HPIB card. It has two possible "places", I'll look later, and you need to put the card info into both of them. This even happened on my Tek DM system.


Have you got the cal program files?

steve

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Brian via Groups.Io
Sent: Thursday, May 30, 2019 1:06 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] TDS744 not 'A' has a problem , help needed

Hi Steve , thank you for that . I have heard several ideas about the NVRAM contents , one is said to hold just saved waveforms and setups and the other holding cal data and installed options , cant remember which is said to do what so I'll need to search EEblog again . I have heard it said also that there are a couple of NVRAM chips underneath the acquisition pcb , little 8 pin chips , that hold factory cal data but that it is only a copy of one of the Dallas chips and is there for emergency's for use at a cal center , those 2 chips are there even on my non A version . The same source if I remember correctly said that the system does not actually use this data it relies on the Dallas chip .
I have a Fluke DC calibrator and 6.5,7.5 and 8.5 digit DVM's. Signal generators , I have synthesized gen's up to 18GHz but their output is too low , but I do have a couple of small 1MHz - 5GHz amps with output up to 20dBm that might make it possible . the final output will not be levelled directly but the input will be , to make certain I do have HP438A power meter and sensors , I also have a RACAL true RMS voltmeter that is good to 2GHz .Unlike some here I do have several old PC's with windows 95/98 could even run windows 3.11 , I have also the NI PC2A GPIB cards and drivers and a copy of the cal s/w

I am in the UK if you hadnt guessed so I think we are more than just a few miles apart or I would be happy to join you for that after school project Brian

On Thursday, 30 May 2019, 20:32:31 BST, Stephen Hanselman <kc4sw.io@...> wrote:

I've heard the talk flow both ways but to my knowledge the calibration data is held in NVRAM on the Acquisition pca not in the Proc. I've looked in several of the Dallas Chips and mostly what you see is empty space. I suspect, but have no proof, that these things are used to store trace data. I have taken non-working (fails SPC etc) and swapped in working calibrated Acq and had it remember it's calibration data.

Calibration requirements are actually fairly lax. You need a good, accurate DC source, DMM, and after that almost any reasonable sig gen would work. I have SG503 and SG504 the scope tells you if the particular signal you are looking at from the "SG's" is correct and then goes off and calibrates itself. The initial DC calibrations are critical however. The las thing is a HPIB based controller to run the test suite. I tried several incarnations and finally bought a Tek Data Manager. Given no experience and all manual TE I would plan on a full day for the cal, and be prepared to become extremely bored.

If you look at your diagnostics screen where it shows SPC, Voltage ref, Frequency...... there are 4 states Initialized (after cold start), running, passed, failing. I found out the hard way that even when you pass the CVR testing voltage ref may say "running" although not next in the sequence you have to run probe comp to get it to read "passing" there are a few other gotchas in the software similar to this.

If you were close by I'd tell you to bring it in as an afterschool project, but...

Hope this helps you a bit. Like they say though, your mileage may vary

steve

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Brian via Groups.Io
Sent: Thursday, May 30, 2019 8:19 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] TDS744 not 'A' has a problem , help needed

Hi Stephen , fortunately the scope remembers the date and the clock is running fine . I have NVRAM back-up s/w from EEBLOG so hopefully it will keep a record of the contents assuming it works on the much older scopes but I cant see why it shouldnt . I do have some GPIB experience and enough gear to connect to the scope .The scope does have nice options for me 13,1f,2f,2m so I dont really want to loose any of themThe Dallas chips are DS1650Y and DS1486 , I understand that one of them holds calibration data - I dont know that even with the gear I have a complete recalibration would be possible so I need to keep that info as intact as possible for as long as I can . Any calibration equipment that I dont currently have will take time to get hold of as I am retired and only a hobbyist/collector .

On Thursday, 30 May 2019, 16:03:41 BST, Stephen Hanselman <kc4sw.io@...> wrote:

Brian,

Changing out these chips is not really a problem. While they do keep some scope specific info I’ve operated 540A’s without the chip. If you have a vanilla model, no options I’m not sure it’s worth the effort. EBay, yes I know, has some replacements, when you look at the offerings look for one that has a “+” in the part number. So it seems like these are newer ones. The Tek forum has a thread that gives the cross wiring needed to program the Dallas chip in a more common NVRAM environment.

On the other hand if your scope remembers the date and time the chip is probably ok, for a while.

My technique is to add fresh solder to each pin and then heat the pin, not the board, and suck it out. I then insert a socket. So far I have not had an issue with losing data in the chip.

As it stands I have good images for the 540, 540A, and 540B.

Regards,

Stephen Hanselman
Datagate Systems, LLC
3107 North Deer Run Road #24
Carson City, Nevada, 89701
(775) 882-5117 office
(775) 720-6020 mobile
s.hanselman@...
www.datagatesystems.com
a Service Disabled, Veteran Owned Small Business
DISCLAIMER:
This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.
On May 30, 2019, at 07:53, Brian via Groups.Io <brianas1948=yahoo.co.uk@groups.io> wrote:

Hi Bob , thank you . That was only the second one of those scopes I've had anything to do with , I am mostly 500 series + 661 and 564 along with 7000 series and 24XX . My first one was a TDS420A with a dead PSU , changing the caps revived it , nothing else was wrong with it . The TDS744 was also one that did not start up , after sorting out the PSU the other faults showed themselves , it was the first time fixing a component level fault on an acquisition pcb . I now have to do something about the Dallas chips they are dated '93!!

On Thursday, 30 May 2019, 15:26:46 BST, Bob Koller via Groups.Io <testtech=yahoo.com@groups.io> wrote:

Well done!



















Re: Clock error on TDS3034

David Kuhn
 

" You may have read in my recent post that I have successfully dug out the
empty battery and connected another one so my quest is over. "

Could you email pics of that, or publish them here? I would like to know,
where in that chip the battery is. I saved my old chip and had intended
to "dig" in to it at some time. Then what, find a 2032 battery socket
somewhere, or rob one off an old mother board and glue that socket to the
top of the chip? There may be some space issues inside the scope where to
put that socket on the chip, or locate it out of the way and run wires.

The original series of the TDS3032 and TDS3034 are still great scopes (I
used to have a 3034 and a 3054 at work before GE Closed us down and moved
the plant overseas). Now, I own two TDS3032s. I have automatic software
that I wrote that uses the scopes via GPIB as part of a test system for
instruments that I work on. I replaced one of the backlight tubes in my
one TDS3032 to brighten up the display. The display is the same one used
in an instrument I work on. I had located a source of the backlight tubes,
but that has dried up now. I have a supply to use for my customer's
instruments, but don't know if I could find them anymore. I had the NEC
part number for those tubes, but may not be able to find it anymore.
Anyway, I think they are super scopes. They have a great digitization rate
for their time. They have features some new scopes can not offer. Here's
a big one: Set the Mid-Reference points for the pulse width measurements.
The TDS3000 series is the only one I have seen that has that feature. You
can get a TDS3032 for $1500, or less. New the TDS3032C is somewhere around
$10K?!! It has a USB socket and maybe able to interface via network, but
other than that, it is still basically the same as far as I can tell.

Dave

Dave

On Thu, May 30, 2019 at 10:37 AM Raymond Domp Frank <@Raymond>
wrote:

Thanks David K. for your info. The company that you linked to seems to
have 1 (!) clock/ram module left.
You may have read in my recent post that I have successfully dug out the
empty battery and connected another one so my quest is over.

Raymond



Re: Clock error on TDS3034

 

Images of battery removal here: https://groups.io/g/TekScopes/album?id=91131

I got the battery out of the DS1742W-150 clock module/RAM as follows:
Looking at the top of the module, pin 1 at the lower left, I saw a slight circular bulge in the top area above pins 7 - 18, so about the right half of the module. Since I hadn't been successful in trying to purchase a new module, I decided to go in and remove material from the top right half. After milling off about 2 mm, I reached the minus (-) pole of the Lithium battery with a metal tab welded on. I wedged in a surgical knife between battery and tab and bent the tab back, away from the "theater". I was able to free the rest of the battery by digging further until I could slightly move the battery up and down. I removed more material from the side (above pins 15-16) so I could slip in a surgical knife underneath. Using that and without being able to see the exact layout, I was able to cut off the plus (+) tab underneath by easing the knife between battery and welded-on tab. I took care not to take too much material away to the left of the battery because I suspect that's where the quartz lives.
Not a very big deal apart from the "heroism" to go in and risk it all but it made me a happy camper...

I soldered a pair of wires to the tabs, covered the area with heat glue and connected a CR2032 in a socket. I put the module with battery on top into a low profile socket on the PCB. Leaves about 3 mm room.
Timekeeping is fine, GPIB address, time/div and vertical settings are remembered flawlessly.

Raymond

Re: Clock error on TDS3034

Jim Ford
 

Yep, we use the TDS3032B, 3034B, and 3054B at work (Raytheon).  Great little scopes!I get the CR2032 coin cells from Digi-Key in quantity 50 for about 25 cents apiece.  Versus several dollars apiece at the drugstore.  I use 'em in my pocket LED flashlight and LED baseball cap.The backup battery in my TLA711 controller went out a couple years ago so I tried to replace the module (memory, battery, and 32. kHz crystal) with a memory chip with the xtal and CR2032 holder soldered on top.  But I botched the job and lost a trace or two on the board.  Someday I'll ask this group where to get a schematic....Good luck, David.I was lucky in that the coin cell holder fit nicely over the rather large 24-pin DIP memory IC.  Pins were just far enough apart to solder down and hold the holder in place.Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: David Kuhn <Daveyk021@...> Date: 5/31/19 3:58 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Clock error on TDS3034 " You may have read in my recent post that I have successfully dug out theempty battery and connected another one so my quest is over.  "Could you email pics of that, or publish them here?  I would like to know,where in that chip the battery is.   I saved my old chip and had intendedto "dig" in to it at some time.  Then what, find a 2032 battery socketsomewhere, or rob one off an old mother board and glue that socket to thetop of the chip?  There may be some space issues inside the scope where toput that socket on the chip, or locate it out of the way and run wires.The original series of the TDS3032 and TDS3034 are still great scopes (Iused to have a 3034 and a 3054 at work before GE Closed us down and movedthe plant overseas).    Now, I own two TDS3032s.  I have automatic softwarethat I wrote that uses the scopes via GPIB as part of a test system forinstruments that I work on.  I replaced one of the backlight tubes in myone TDS3032 to brighten up the display.  The display is the same one usedin an instrument I work on.  I had located a source of the backlight tubes,but that has dried up now.  I have a supply to use for my customer'sinstruments, but don't know if I could find them anymore.  I had the NECpart number for those tubes, but may not be able to find it anymore.Anyway, I think they are super scopes.  They have a great digitization ratefor their time.  They have features some new scopes can not offer.  Here'sa big one: Set the Mid-Reference points for the pulse width measurements. The TDS3000 series is the only one I have seen that has that feature.  Youcan get a TDS3032 for $1500, or less.  New the TDS3032C is somewhere around$10K?!!  It has a USB socket and maybe able to interface via network, butother than that, it is still basically the same as far as I can tell.DaveDaveOn Thu, May 30, 2019 at 10:37 AM Raymond Domp Frank <@Raymond>wrote:> Thanks David K. for your info. The company that you linked to seems to> have 1 (!) clock/ram module left.> You may have read in my recent post that I have successfully dug out the> empty battery and connected another one so my quest is over.>> Raymond>> >>

Re: Clock error on TDS3034

Harvey White
 

There are LED replacement strips available for many CCFL tubes, but need to be ordered on a specific display number, of course. You can make an LED strip using surface mount LEDS, etc.  Those do have some point source problems, but a wide dispersion angle LED may work.

Harvey

On 5/31/2019 6:58 AM, David Kuhn wrote:
" You may have read in my recent post that I have successfully dug out the
empty battery and connected another one so my quest is over. "

Could you email pics of that, or publish them here? I would like to know,
where in that chip the battery is. I saved my old chip and had intended
to "dig" in to it at some time. Then what, find a 2032 battery socket
somewhere, or rob one off an old mother board and glue that socket to the
top of the chip? There may be some space issues inside the scope where to
put that socket on the chip, or locate it out of the way and run wires.

The original series of the TDS3032 and TDS3034 are still great scopes (I
used to have a 3034 and a 3054 at work before GE Closed us down and moved
the plant overseas). Now, I own two TDS3032s. I have automatic software
that I wrote that uses the scopes via GPIB as part of a test system for
instruments that I work on. I replaced one of the backlight tubes in my
one TDS3032 to brighten up the display. The display is the same one used
in an instrument I work on. I had located a source of the backlight tubes,
but that has dried up now. I have a supply to use for my customer's
instruments, but don't know if I could find them anymore. I had the NEC
part number for those tubes, but may not be able to find it anymore.
Anyway, I think they are super scopes. They have a great digitization rate
for their time. They have features some new scopes can not offer. Here's
a big one: Set the Mid-Reference points for the pulse width measurements.
The TDS3000 series is the only one I have seen that has that feature. You
can get a TDS3032 for $1500, or less. New the TDS3032C is somewhere around
$10K?!! It has a USB socket and maybe able to interface via network, but
other than that, it is still basically the same as far as I can tell.

Dave

Dave

On Thu, May 30, 2019 at 10:37 AM Raymond Domp Frank <@Raymond>
wrote:

Thanks David K. for your info. The company that you linked to seems to
have 1 (!) clock/ram module left.
You may have read in my recent post that I have successfully dug out the
empty battery and connected another one so my quest is over.

Raymond




2465B battery

Alberto I2PHD
 

Can please somebody confirm (or deny) that the battery holding the calibration data of a first series 2465B is a CR2032 ?

Thanks.
--
/*73 Alberto I2PHD*
<<< http://www.weaksignals.com >>>/

Re: Clock error on TDS3034

Bob Koller
 

There are also generic LED strips available where you can trim to length, within a 3-LED pitch, as the electrical configuration is 3 LED's in series, with each triplet in parallel.
I have used these to replace the CCFL in several LCD modules. They come with a small inverter that provides intensity control.

Re: 2465B battery

Bob Koller
 

Nope, the 2465B has a Dallas chip.

Re: 497P power supply aluminum spacers???

radioconnection@...
 

Small aluminum spacers go between the PCB and a heat sink that holds three transistors. Removed two screws on top of board that did not need to be removed for cap replacement.

Re: 2465B battery

Alberto I2PHD
 

On 2019-05-31 17:45, Bob Koller via Groups.Io wrote:

Nope, the 2465B has a Dallas chip.
I think that is true for the second series, those with SN >= B050000
Mine has a SN = B012133, and as such it has a battery and cmos ram setup.

My question is if that battery is a CR2032 or different.

--
/*73 Alberto I2PHD*
<<< http://www.weaksignals.com >>>/

Strange 7854 problem with bracket holding digital boards

Fred S.
 

My 7854 behaves randomly, sometimes it boots up, sometimes not with different red leds and vert, hor switches on. If I remove the bracket holding the digital cards It works fine. Did anybody have a similar problem in the past?

Best regards,

Fred S.

Re: 2465B battery

Bob Koller
 

You are correct, that the SMD control boards B05+, have the Dallas chip. The earlier boards, and the 2465A, use a Keeper LTC-7P battery. These are virtually never bad, I don't think I have had to replace more than one or two, in the many dozens of scope I have repaired over the years. You can of course replace if you want, but would loose the cal constants unless you tag another battery with current limit resistor across whilst swapping. I have done this many times with other instruments.