Re: Cheap differential probe ?
Hello,
May or may not be a fit for your application or budget, but I saw this on page 69 of the March 2018 RSGB magazine:
Micsig DP10013 100 MHz high voltage differential probe, about GBP150
Also found on amazon.com for about $170
I do not have one, and have no affiliation with that company (I just subscribe to RSGB).
Hope that it helps.
Scott
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Replacement of Tantalum cap removal of U450??
Hi,
Those of you who were following my "7603 working ... then blank" Thread will know that the problem was a shorted C492 Tanatalum cap on the Vertical Amp board.
To replace this cap, I could simply clip the leads and 'tack' on a replacement ..... or completely remove the old cap leads and properly solder in a new cap. The latter is my preferred solution .... but when I removed the Vertical Amp board (3 screws), the heatsink (aluminum plate) at the rear appears to be held to the circuit board by U450 .... thus restricting access to un-solder the caps leads from the back of the Vert. Amp. board. I did try to un-solder the cap from the top of the board, but not having worked on a Tektronix circuit board before, I was very reluctant to apply too much heat ... :)
U450 includes a threaded base (as per photo in Service Manual) .... and I am unsure as to how to remove it ... or whether I should even try .... :) ..... please advise any ideas?????????
Cheers,
Ian
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Re: What calibration items to buy.
On Sat, 03 Mar 2018 13:46:20 -0800, you wrote: OT:
Although not all that one might want for calibrating scopes, a good start would be a reasonably good Rf signal generator, not necessarily PG or SG modules ...
Some sellers on eBay appear to consistently have "tested" (synthesized) Rf signal generators that go up to 1 or 2 GHz,
at reasonable prices. They often show photos on a spectrum analyzer of their RF signal generator in operation, as proof ... If the SG is leveled, then it can check frequency response. There are several 7000 series plugins (not 7xxx) that can do this, with differing frequency responses. That ought to allow you to use an unleveled SG to check -3db response. However, you'd still need the TG 501 to check the time base, and the PG506 to check amplitude. In addition, the PG506 has some sub 1 ns rise time pulses that can be useful in checking scope rise times. Harvey
For example { although there are many others } : EDIinc
Likely a better place to start than a vendor who shows no such photos...
|
Re: Tek manuals saved from the dumpster - free for postage
Hi guys,
It would be better if you expressed interest via private email rather than
on the list. I subscribe in digest form so direct emails make it easier
for me to keep track of who expresses interest in what by order of
response. I've got takers for everything, but preference still goes to
someone who wants the whole lot for the simple reason that it simplifies
shipping on my end.
Thanks.
|
Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?
On Sat, 3 Mar 2018, machineguy59 via Groups.Io wrote: Thanks for the answer.? That is what I expected but needed and expert
opinion.? I don't mind the problem with the A5 ROM because it will
probably need replacement anyway for battery problems.? Seems my biggest
problem will be to calibrate the result. A5 ROM has nothing to do with calibration -- that is stored in NVRAM -- but it adds those higher sweep rates that 2445B doesn't have i.e. it changes the scope identity. It is no biggie -- you simply erase old EPROMs and re-program them with 2465B firmware. You will have to re-calibrate it even if existing 2445B NVRAM still held the calibration constants -- your A1 board will be diffrent and it has a lot of trimpots/inductors/capacitors to play with while calibrating the assembled instrument. There is absolutely no chance its setup would match whatever is still in NVRAM. On Saturday, March 3, 2018 03:03:37 PM CST, Sergey Kubushyn <ksi@...> wrote:
On Sat, 3 Mar 2018, machineguy59 via Groups.Io wrote:
I have an old A1 board with part number 671-0722-02, with a date of 1987
(design or manufactured?).? I believe this part number is for a 2465B
oscilloscope.? Also, I can obtain a non-working 2445B for a low price.? I
am considering placing this 2465B A1 board in the 2445B chassis, clean it
up, give it a hobbyist calibration.? Will this give me a poor mans 2465B?
What advice can the experts give me before setting out on this mission? It will give you a full featured 2465B, not a poor man's one. All parts
other than A1 board and front panel label are exactly the same for 2445B and
2465B. Ah, the A5 ROM is different too. --- * * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * *
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: TG501 schematics.pdf
Uploaded By:
Robert Hay
Description:
Schematics stitched together from service manual on TekWiki. If anyone has time to check for any stitching boo boos let me know and i will make corrections.
You can access this file at the URL:
/g/TekScopes/files/TG501%20schematics.pdf
Cheers,
The Groups.io Team
|
Re: Tek manuals saved from the dumpster - free for postage
On Sat, 3 Mar 2018, Steve Goldstein wrote: I would take one SD-24 set and SD-14 Service Reference if they are still available. Here are some manuals I saved from the heap over the years. I don't need
them, do you? Strongly prefer local pickup (I'm a bit north of Boston, MA)
but will ship by Media Mail within the US. Preference given to someone who
wants the whole lot.
Here's what I've got:
11801 Programmer Reference Manual, 3-ring binder in slipcase, includes
5-1/4" floppy disc, Aug 1989, 070-7038-01
SD-14 Service Reference, 3-ring binder, Dec 1991 070-8285-00
11401 and 11402 Service Reference, 3-ring binder, Jul 1988 070-6779-02
11801A Service Reference, 3-ring binder, Sep 1991, 070-8024-00
SD-24 Service and Reference Manual, 3-ring binder, Aug 1988, 070-7053-00
with Installation/User Manual, Aug 1988, 070-7052-00
with Functional Test Manual, Oct 1988, 070-7055-00
includes sampling head utility software on 5-1/4" floppy disc
I have two sets of the SD-24 stuff above
Trash day in my locale is Tuesday, and these will be in the trash for the
next pickup if nobody speaks up before then.
Steve
North Reading, MA --- * * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * *
|
Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?
Thanks for the answer.? That is what I expected but needed and expert opinion.? I don't mind the problem with the A5 ROM because it will probably need replacement anyway for battery problems.? Seems my biggest problem will be to calibrate the result.
toggle quoted message
Show quoted text
On ?Saturday?, ?March? ?3?, ?2018? ?03?:?03?:?37? ?PM? ?CST, Sergey Kubushyn <ksi@...> wrote: On Sat, 3 Mar 2018, machineguy59 via Groups.Io wrote: I have an old A1 board with part number 671-0722-02, with a date of 1987
(design or manufactured?).? I believe this part number is for a 2465B
oscilloscope.? Also, I can obtain a non-working 2445B for a low price.? I
am considering placing this 2465B A1 board in the 2445B chassis, clean it
up, give it a hobbyist calibration.? Will this give me a poor mans 2465B?
What advice can the experts give me before setting out on this mission? It will give you a full featured 2465B, not a poor man's one. All parts other than A1 board and front panel label are exactly the same for 2445B and 2465B. Ah, the A5 ROM is different too. --- * *? KSI@home? ? KOI8 Net? < >? The impossible we do immediately.? * *? Las Vegas? NV, USA? < >? Miracles require 24-hour notice.? * *
|
Tek manuals saved from the dumpster - free for postage
Here are some manuals I saved from the heap over the years. I don't need
them, do you? Strongly prefer local pickup (I'm a bit north of Boston, MA)
but will ship by Media Mail within the US. Preference given to someone who
wants the whole lot.
Here's what I've got:
11801 Programmer Reference Manual, 3-ring binder in slipcase, includes
5-1/4" floppy disc, Aug 1989, 070-7038-01
SD-14 Service Reference, 3-ring binder, Dec 1991 070-8285-00
11401 and 11402 Service Reference, 3-ring binder, Jul 1988 070-6779-02
11801A Service Reference, 3-ring binder, Sep 1991, 070-8024-00
SD-24 Service and Reference Manual, 3-ring binder, Aug 1988, 070-7053-00
with Installation/User Manual, Aug 1988, 070-7052-00
with Functional Test Manual, Oct 1988, 070-7055-00
includes sampling head utility software on 5-1/4" floppy disc
I have two sets of the SD-24 stuff above
Trash day in my locale is Tuesday, and these will be in the trash for the
next pickup if nobody speaks up before then.
Steve
North Reading, MA
|
Re: What calibration items to buy.
OT:
Although not all that one might want for calibrating scopes, a good start would be a reasonably good Rf signal generator, not necessarily PG or SG modules ...
Some sellers on eBay appear to consistently have "tested" (synthesized) Rf signal generators that go up to 1 or 2 GHz,
at reasonable prices. They often show photos on a spectrum analyzer of their RF signal generator in operation, as proof ...
For example { although there are many others } : EDIinc
Likely a better place to start than a vendor who shows no such photos...
|
Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?
On Sat, 3 Mar 2018, machineguy59 via Groups.Io wrote: I have an old A1 board with part number 671-0722-02, with a date of 1987
(design or manufactured?). I believe this part number is for a 2465B
oscilloscope. Also, I can obtain a non-working 2445B for a low price. I
am considering placing this 2465B A1 board in the 2445B chassis, clean it
up, give it a hobbyist calibration. Will this give me a poor mans 2465B? What advice can the experts give me before setting out on this mission? It will give you a full featured 2465B, not a poor man's one. All parts other than A1 board and front panel label are exactly the same for 2445B and 2465B. Ah, the A5 ROM is different too. --- * * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * *
|
Re: What calibration items to buy.
On Sat, 3 Mar 2018 19:16:42 -0000, you wrote: Errm no. Those need a Pulse Head - no kit for that, and the SG5030 needs a
levelling head - sadly no kit for that either. That (and price) is why I guess I don't have either. Oh well. Do have the PG506 and TG601, as well as an SG502 and 503. The 504 has eluded me. Harvey
David
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Harvey
White
Sent: 03 March 2018 18:46
To: [email protected]
Subject: Re: [TekScopes] What calibration items to buy.
On Sat, 03 Mar 2018 10:06:34 -0800, you wrote:
As far as I know, the PG506 calibration generator and SG504 leveled
sinewave generator would be the ideal choice. They're compact and serve many of the purposes. The SG504 has a level output up to 1050Mhz while the
SG503 only goes to 250Mhz. I'm not sure what else may be out there that is
in the $500.00 USD or less range, but those are the units that I also want,
but don't actually need.
Without considering price in particular, you may want to check the
CG501 (TM500) and the CG5001 (TM5000). These combine the functions of the
PG506 and SG5xx series. However, they need a leveling head which is
typically missing. I think there might be a DIY version out there, though.
Any of the TM5000 series can be remote controlled, any of the TM500 is not
made to to be remoted. The remote control mechanism is HPIB/IEEE-488.
Harvey
I'm currently equipped with what is recommended by the 485 manual, but
those two plugins can handle the jobs of a shelf worth of the original
manual specified calibration gear, so I'd most definitely try to find those
plugins instead.
Also, my knowledge of calibration equipment doesn't extend beyond Tektronix
made gear, so there's most likely other options out there as well.
-Brian
|
Re: What calibration items to buy.
Also add the TG-501 Time Mark Generator. I have some of those and the TM-50n Power Supplies for them. Someday I'll get tired of looking at them and sell off the whole lot. 73, Dick, W1KSZ On Sat, Mar 3, 2018 at 11:06 AM, Brian Bloom via Groups.Io < analogaddict013@...> wrote: As far as I know, the PG506 calibration generator and SG504 leveled
sinewave generator would be the ideal choice. They're compact and serve
many of the purposes. The SG504 has a level output up to 1050Mhz while the
SG503 only
goes to 250Mhz. I'm not sure what else may be out there that is in the
$500.00 USD or less range, but those are the units that I also want, but
don't actually need.
I'm currently equipped with what is recommended by the 485 manual, but
those two plugins can handle the jobs of a shelf worth of the original
manual specified calibration gear, so I'd most definitely try to find those
plugins instead.
Also, my knowledge of calibration equipment doesn't extend beyond
Tektronix made gear, so there's most likely other options out there as well.
-Brian
|
Re: What calibration items to buy.
Yes, that is what I meant by ¡°build¡±
DaveD
Sent from a small flat thingy
toggle quoted message
Show quoted text
On Mar 3, 2018, at 12:14, David C. Partridge <david.partridge@...> wrote:
Though you can make a levelling head... See:
< >
Cheers
Dave Partridge
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave Daniel
Sent: 03 March 2018 18:23
To: [email protected]
Subject: Re: [TekScopes] What calibration items to buy.
If you do buy an SG-540, make sure that it comes with the leveling head. If it doesn¡¯t, you¡¯ll have to buy or build one. The generator is not much use without the head.
DaveD
Sent from a small flat thingy
On Mar 3, 2018, at 11:06, Brian Bloom via Groups.Io <analogaddict013@...> wrote:
As far as I know, the PG506 calibration generator and SG504 leveled
sinewave generator would be the ideal choice. They're compact and serve many of the purposes. The SG504 has a level output up to 1050Mhz while the SG503 only goes to 250Mhz. I'm not sure what else may be out there that is in the $500.00 USD or less range, but those are the units that I also want, but don't actually need.
I'm currently equipped with what is recommended by the 485 manual, but those two plugins can handle the jobs of a shelf worth of the original manual specified calibration gear, so I'd most definitely try to find those plugins instead.
Also, my knowledge of calibration equipment doesn't extend beyond Tektronix made gear, so there's most likely other options out there as well.
-Brian
|
Re: What calibration items to buy.
Errm no. Those need a Pulse Head - no kit for that, and the SG5030 needs a
levelling head - sadly no kit for that either.
David
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Harvey White Sent: 03 March 2018 18:46 To: [email protected]Subject: Re: [TekScopes] What calibration items to buy. On Sat, 03 Mar 2018 10:06:34 -0800, you wrote: As far as I know, the PG506 calibration generator and SG504 leveled
sinewave generator would be the ideal choice. They're compact and serve many of the purposes. The SG504 has a level output up to 1050Mhz while the SG503 only goes to 250Mhz. I'm not sure what else may be out there that is in the $500.00 USD or less range, but those are the units that I also want, but don't actually need. Without considering price in particular, you may want to check the CG501 (TM500) and the CG5001 (TM5000). These combine the functions of the PG506 and SG5xx series. However, they need a leveling head which is typically missing. I think there might be a DIY version out there, though. Any of the TM5000 series can be remote controlled, any of the TM500 is not made to to be remoted. The remote control mechanism is HPIB/IEEE-488. Harvey
I'm currently equipped with what is recommended by the 485 manual, but
those two plugins can handle the jobs of a shelf worth of the original manual specified calibration gear, so I'd most definitely try to find those plugins instead.
Also, my knowledge of calibration equipment doesn't extend beyond Tektronix
made gear, so there's most likely other options out there as well.
-Brian
|
Re: What calibration items to buy.
Though you can make a levelling head... See:
< >
Cheers
Dave Partridge
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Dave Daniel Sent: 03 March 2018 18:23 To: [email protected]Subject: Re: [TekScopes] What calibration items to buy. If you do buy an SG-540, make sure that it comes with the leveling head. If it doesn¡¯t, you¡¯ll have to buy or build one. The generator is not much use without the head. DaveD Sent from a small flat thingy On Mar 3, 2018, at 11:06, Brian Bloom via Groups.Io <analogaddict013@...> wrote:
As far as I know, the PG506 calibration generator and SG504 leveled
sinewave generator would be the ideal choice. They're compact and serve many of the purposes. The SG504 has a level output up to 1050Mhz while the SG503 only goes to 250Mhz. I'm not sure what else may be out there that is in the $500.00 USD or less range, but those are the units that I also want, but don't actually need.
I'm currently equipped with what is recommended by the 485 manual, but those two plugins can handle the jobs of a shelf worth of the original manual specified calibration gear, so I'd most definitely try to find those plugins instead.
Also, my knowledge of calibration equipment doesn't extend beyond Tektronix made gear, so there's most likely other options out there as well.
-Brian
|
Just noticed a previous wrinkle here, so I'll document it to avoid
confusing someone else when reading this thread in the future.
Even though the graticule has 10x10 divisions, the 1969 catalog tells that
each division measures 5/16 inches ~= 0.8 cm. Then, 10 divisions
corresponds to ~8 cm maximum (useful) vertical (D3/D4 plates) scan.
Also, explicitly stated as "providing 8 cm of linear vertical deflection"
in Tek's 1960 catalog.
So far, in the schematics I checked (from scopes using this CRT) the
chosen PDA voltage is 4 kV, though the maximum stated in the datasheet is
6 kV. So, maybe a conservative/derating design choice here.
Regarding the phosphor, the available datasheet is dated March 1958, so
other options out of P1, P2, P7, P11 were not available at the time.
P31 became the standard option some years later.
Therefore, there seem to be no problem with the 5CAP (former code for
T52P) CRT datasheet hosted in Frank's site.
Sebastian.
PS: I'm still interested in more technical details of this CRT w.r.t. std.
contemporary scope tubes. Any comment/pointer will be greatly
appreciated.
toggle quoted message
Show quoted text
On Mon, February 19, 2018 2:48 pm, Sebastian Garcia wrote: I thought linearity is good in the extremes of the 10x10 useful area of
the 570, achieved by trading off other CRT parameters not required for a
CT equipment (but usually required for a scope).
Of course, I may be wrong; would like to know more about this noticeable
difference between the CT tubes and contemporary scope tubes, with maximum
vertical scan typically being 6 cm.
Yet another discrepancy is the acceleration voltage: 4kV mentioned in
descriptions like Keller's article, and 6kV in this datasheet.
The 570 schematics shows 4kV.
This datasheet also lacks all the phosphor options we see in previously
mentioned websites (including P31, the standard for the '570).
Sebastian.
Chuck Harris wrote:
It could be as simple as the linear viewing area is 8x10cm,
and the outer 1cm are a touch nonlinear, but still can be viewed.
-Chuck Harris
Sebastian Garcia wrote:
In fact I see that VintageTek site is hosting Keller's article "Tek
CRT
History".
There (part 3) it confirms that the type 570 CT uses a T52 CRT, also
coded
as 5CAP.
Still, the available 5CAP1 datasheet is about a CRT with 8 cm useful
vertical scan.
Any comment will be appreciated, as I may be missing something.
Sebastian.
|
Re: What calibration items to buy.
On Sat, 03 Mar 2018 10:06:34 -0800, you wrote: As far as I know, the PG506 calibration generator and SG504 leveled sinewave generator would be the ideal choice. They're compact and serve many of the purposes. The SG504 has a level output up to 1050Mhz while the SG503 only
goes to 250Mhz. I'm not sure what else may be out there that is in the $500.00 USD or less range, but those are the units that I also want, but don't actually need. Without considering price in particular, you may want to check the CG501 (TM500) and the CG5001 (TM5000). These combine the functions of the PG506 and SG5xx series. However, they need a leveling head which is typically missing. I think there might be a DIY version out there, though. Any of the TM5000 series can be remote controlled, any of the TM500 is not made to to be remoted. The remote control mechanism is HPIB/IEEE-488. Harvey
I'm currently equipped with what is recommended by the 485 manual, but those two plugins can handle the jobs of a shelf worth of the original manual specified calibration gear, so I'd most definitely try to find those plugins instead.
Also, my knowledge of calibration equipment doesn't extend beyond Tektronix made gear, so there's most likely other options out there as well.
-Brian
|
Re: What calibration items to buy.
If you do buy an SG-540, make sure that it comes with the leveling head. If it doesn¡¯t, you¡¯ll have to buy or build one. The generator is not much use without the head.
DaveD
Sent from a small flat thingy
toggle quoted message
Show quoted text
On Mar 3, 2018, at 11:06, Brian Bloom via Groups.Io <analogaddict013@...> wrote:
As far as I know, the PG506 calibration generator and SG504 leveled sinewave generator would be the ideal choice. They're compact and serve many of the purposes. The SG504 has a level output up to 1050Mhz while the SG503 only
goes to 250Mhz. I'm not sure what else may be out there that is in the $500.00 USD or less range, but those are the units that I also want, but don't actually need.
I'm currently equipped with what is recommended by the 485 manual, but those two plugins can handle the jobs of a shelf worth of the original manual specified calibration gear, so I'd most definitely try to find those plugins instead.
Also, my knowledge of calibration equipment doesn't extend beyond Tektronix made gear, so there's most likely other options out there as well.
-Brian
|
Re: What calibration items to buy.
As far as I know, the PG506 calibration generator and SG504 leveled sinewave generator would be the ideal choice. They're compact and serve many of the purposes. The SG504 has a level output up to 1050Mhz while the SG503 only
goes to 250Mhz. I'm not sure what else may be out there that is in the $500.00 USD or less range, but those are the units that I also want, but don't actually need.
I'm currently equipped with what is recommended by the 485 manual, but those two plugins can handle the jobs of a shelf worth of the original manual specified calibration gear, so I'd most definitely try to find those plugins instead.
Also, my knowledge of calibration equipment doesn't extend beyond Tektronix made gear, so there's most likely other options out there as well.
-Brian
|
Sergey Kubushyn
David C. Partridge