Date   

Re: Tek 492BP how to save via GPIB to a PC

 

Check that the GPOIB-USB-HS is showing up correctly in Device Manger. Mine needed its EEPROM reloading to work.

D.

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of John Miles
Sent: 05 March 2021 09:23
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek 492BP how to save via GPIB to a PC

Sounds like you either don't have the NI drivers installed, or the board ID is set to something other than GPIB0. What does the menu in GPIB configurator look like? If it doesn't show up as GPIB0 you'll need to select the correct board entry and hit 'Update CONNECT.INI' before you can use the programs with it. (Or you can change the board ID in the NI software, I believe.)

-- john, KE5FX

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Mike
Yepes
Sent: Thursday, March 04, 2021 5:04 PM
To: TekScopes@groups.io
Subject: [TekScopes] Tek 492BP how to save via GPIB to a PC

I have an 492BP, and a GPIB to USB National Instruments. Can I use the HP
7470A plotter program to save screens?
I tried and I get error borad GPIB0 not found.



Re: 7854 Source Code for version 1.02, 1982 release now on Kurt's TekWiki

 

Aha! Found it in the "Other Info" stuff in the box on the RHS of the main page for the 7854

D.

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of David C. Partridge
Sent: 05 March 2021 10:20
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7854 Source Code for version 1.02, 1982 release now on Kurt's TekWiki

Where is that please.

David

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Clark Foley
Sent: 05 March 2021 05:33
To: TekScopes@groups.io
Subject: [TekScopes] 7854 Source Code for version 1.02, 1982 release now on Kurt's TekWiki

Kurt Rosenfeld has posted the entire line printer listing (454 pages) of the 1982 source code version 1.02 for the 7854. It's an early release but it reveals some interesting things.


Re: 7854 Source Code for version 1.02, 1982 release now on Kurt's TekWiki

 

Where is that please.

David

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Clark Foley
Sent: 05 March 2021 05:33
To: TekScopes@groups.io
Subject: [TekScopes] 7854 Source Code for version 1.02, 1982 release now on Kurt's TekWiki

Kurt Rosenfeld has posted the entire line printer listing (454 pages) of the 1982 source code version 1.02 for the 7854. It's an early release but it reveals some interesting things.


Re: Tek 492BP how to save via GPIB to a PC

John Miles
 

Sounds like you either don't have the NI drivers installed, or the board ID is set to something other than GPIB0. What does the menu in GPIB configurator look like? If it doesn't show up as GPIB0 you'll need to select the correct board entry and hit 'Update CONNECT.INI' before you can use the programs with it. (Or you can change the board ID in the NI software, I believe.)

-- john, KE5FX

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Mike
Yepes
Sent: Thursday, March 04, 2021 5:04 PM
To: TekScopes@groups.io
Subject: [TekScopes] Tek 492BP how to save via GPIB to a PC

I have an 492BP, and a GPIB to USB National Instruments. Can I use the HP
7470A plotter program to save screens?
I tried and I get error borad GPIB0 not found.



Re: O.T. Digital scopes versus Tek analogue.

Sean Turner
 

Thanks, I can't keep up with it. Ugh. It's really painful to see the remains of once-great companies be drones in a corporate army. =[

Sean

On Thu, Mar 4, 2021 at 11:11 PM, hardyhansendk wrote:


Fortive ows them all now.
Regards
Hardy


Re: O.T. Digital scopes versus Tek analogue.

hardyhansendk
 

Fortive ows them all now.
Regards
Hardy

-----Oprindelig meddelelse-----
Fra: TekScopes@groups.io [mailto:TekScopes@groups.io] På vegne af Sean Turner
Sendt: 5. marts 2021 07:56
Til: TekScopes@groups.io
Emne: Re: [TekScopes] O.T. Digital scopes versus Tek analogue.

Jeff,

An instrument called a "source measure unit" is what is typically sold these days as an instrument for curve tracing (and other purposes). Keithley (which is a Tektronix/Danaher subsidiary now) offers them, and they are ruinously expensive for the hobbyist (at least new). They have computer interfaces and programmability. I don't think any of the big T&M manufacturers offer a curve tracer any more. Since everything is either tiny surface mount or an ASIC or an FPGA nowadays, there's no demand. Logic analyzers are headed the same way. I think Keysight is the only company that offers a true benchtop logic analyzer anymore. Tek discontinued the TLA series and directs you to buy a mixed signal scope instead.

Sean

On Mon, Mar 1, 2021 at 01:55 PM, Jeff Dutky wrote:


Okay, I'm not disagreeing with you (I'm kind of interested in a good X-Y mode
too), but, for curve tracing, aren't there any good, modern, purely digital
(as in all data collected by a DAC and then displayed on a simple raster
display) curve tracers?




--
Denne mail er kontrolleret for vira af AVG.
http://www.avg.com


Re: O.T. Digital scopes versus Tek analogue.

Sean Turner
 

Jeff,

An instrument called a "source measure unit" is what is typically sold these days as an instrument for curve tracing (and other purposes). Keithley (which is a Tektronix/Danaher subsidiary now) offers them, and they are ruinously expensive for the hobbyist (at least new). They have computer interfaces and programmability. I don't think any of the big T&M manufacturers offer a curve tracer any more. Since everything is either tiny surface mount or an ASIC or an FPGA nowadays, there's no demand. Logic analyzers are headed the same way. I think Keysight is the only company that offers a true benchtop logic analyzer anymore. Tek discontinued the TLA series and directs you to buy a mixed signal scope instead.

Sean

On Mon, Mar 1, 2021 at 01:55 PM, Jeff Dutky wrote:


Okay, I'm not disagreeing with you (I'm kind of interested in a good X-Y mode
too), but, for curve tracing, aren't there any good, modern, purely digital
(as in all data collected by a DAC and then displayed on a simple raster
display) curve tracers?


Re: 547 HV Transformer: Bill Schell rewind failed

fiftythreebuick
 

Hi Dave-

I'm sorry to hear that you're having trouble with that HV XFMR....

I did a lot of testing and evaluation for Bill Schell over the years and I don't remember him every testing a transformer with any epoxy in it at all. He and I both felt that we oughta get as far away from that as possible. He first wound them without sealing them and I have never had one of those fail. Then when he started treating them with beeswax and a vacuum chamber, it seemed like he had found quite a good process. So far, I have never had one of his fail, of any description.

Just saw your later post and I'm glad that yours is improving! A friend of mine has restored an original xfmr by putting it in a vacuum chamber and keeping it in a deep vacuum for a while. Don't remember how long he left it in there.

I hope yours comes out alright. It really does seem like the moisture is the major factor.

Tom


7854 Source Code for version 1.02, 1982 release now on Kurt's TekWiki

Clark Foley
 

Kurt Rosenfeld has posted the entire line printer listing (454 pages) of the 1982 source code version 1.02 for the 7854. It's an early release but it reveals some interesting things.


Re: 2235 AN/USM-488 power supply low voltages

Ozan
 

Voltages as follows


+5.2=4.3
+8.6=7.4
-8.6=-7.3
+30=+25.8
+100=+87.8
All the voltages are about 86-88% of their target value. Especially -8.6V is the reference for all other supplies so if it is off by some percentage all others will be off by about the same percentage. "Power Supply and CRT DISPLAY" adjustment section (page 5-4) of the manual gives the steps for R938 trim which should fix -8.6V and all other supplies if there is no other fault.

Ozan


Re: 547 HV Transformer: Bill Schell rewind failed

Eric
 

Chuck,

Are you in need of bees wax? I might be able to get some in bulk. I happen
to know a couple of bee keepers. I would also like to learn more about the
transformer winder when the time is right.

Eric

On Thu, Mar 4, 2021, 7:45 PM Chuck Harris <cfharris@erols.com> wrote:

Hi Bernd,

All indications are that my new machine is going to
do an even better job than the best I could do with
the old manual machine.

As an example, I was able to get 2/3 of the way to a
full wind without using the rosin/alcohol mixture that
I developed to enhance the wire's friction...

Using the rosin/alcohol, I am there already.

And, I will be using beeswax.

I'm glad to hear the prototype is still soldiering
on. Soon, I may be able to get you the winds I promised
oh so long ago...

-Chuck Harris

widgethunter via groups.io wrote:
My memory certainly hasn't improved with age.Not much else seems to
have, either...But, the beeswax thing I'd be willing to put money on - fwiw.
Incidentally, I still have not installed the 2nd wax xfrmr you made for
me, but the 1st prototype continues to perform flawlessly.Bernd



-----Original Message-----
From: Chuck Harris <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Thu, Mar 4, 2021 4:05 pm
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

I guess the biggest indicator of a scatter wind would be
the presence of a spool. The universal wind doesn't require
any additional support.

In addition to talking to you, I talked to Deane Kidd, and
Deane talked about Bill using beeswax, like tektronix did in
the earlier transformers.

But, like you, it has been a looong time, and I don't think
our memories are getting any better.

-Chuck Harris

widgethunter via groups.io wrote:
Hi Chuck;Assumed scatter because of the larger size of Schell
rewinds.It has been a looong time, but I think I'd remember if he'd said
anything about epoxy...B



-----Original Message-----
From: Chuck Harris <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Wed, Mar 3, 2021 9:57 am
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

There have been several discussions about Bill's transformers of
late, and there is a picture on the group, that looks very much
like epoxy varnish, or some other non wax compound.

However, it is most definitely not scatter wound. It is a nice
looking, self supporting, universal wind.

Bill didn't use an outer tape covering on this transformer. The
naked winding is right there for you to see.

-Chuck Harris














2235 AN/USM-488 power supply low voltages

richardallred@...
 

I bought this scope earlier this summer as new old stock, never powered on. Due to covid illness I never opened it until a week ago. The scope powered on ,but the trace only covered about 2/3s of the screen and was jumping all over.

After it was warming up only got worse, I decided to check the voltages on the power supply and all were low.

So I did a full recap (caps are still old even though the scope has zero hours) and also replaced the following:

VR 901
Q935
Q946, 947
Q9070
R888,889,890,891,892
R900
and the ac filter
all 3 rifa x class caps


Same problem still exist

Voltages as follows


+5.2=4.3
+8.6=7.4
-8.6=-7.3
+30=+25.8
+100=+87.8

resistance to ground;

+5.2=188oms
+8.6=129.8 ohms
-8.6=81 oms
+30=552 ohms
+100=16k ohms


also the trigger led blinks when the scope is on. I have been reading all the power supply post here and frankly, I'm stumped

This is my first attempt a troubleshooting a switch mode power supply. any and all suggestions would be greatly appreciated

Thanks in advance
R A


Re: Replacing Variable Vertical Attenuator Shaft

stevenhorii
 

Dick,

I parted out some 7000-series plug-ins that were not repairable. I believe
I have some of those G-10 rods. They connect to pots via a coupler with two
set screws. If that rod is what you need, let me look at what I have and
I’d be glad to send you one. If they are longer than 7”, it would be simple
to cut it to length.

You can contact me off list if you wish or reply here. My e-mail is:
sonodocsch at gmail dot com.

Steve Horii

On Thu, Mar 4, 2021 at 20:47 Dick <w1ksz@outlook.com> wrote:

The shaft is a piece of G-10 rod that's about 7" long. It goes
from the Front panel to a bushing buried in the Vertical Amplifier.

I thought I would ask before I butcher the job.

I am located in Vail, Arizona. About 20m SSE of Tucson.

73, Dick, W1KSZ
________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Waltzingbear
<alan@waltzingbear.com>
Sent: Thursday, March 4, 2021 10:57 AM
To: TekScopes@groups.io <TekScopes@groups.io>
Subject: Re: [TekScopes] Replacing Variable Vertical Attenuator Shaft

I bet that is an AB mod pot, in which case you can repair the pot with a
new shaft part. What is the length of the shaft?

oh, and what part of the world are you located in.

Cheers
Alan











Re: Replacing Variable Vertical Attenuator Shaft

Dick
 

The shaft is a piece of G-10 rod that's about 7" long. It goes
from the Front panel to a bushing buried in the Vertical Amplifier.

I thought I would ask before I butcher the job.

I am located in Vail, Arizona. About 20m SSE of Tucson.

73, Dick, W1KSZ
________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Waltzingbear <alan@waltzingbear.com>
Sent: Thursday, March 4, 2021 10:57 AM
To: TekScopes@groups.io <TekScopes@groups.io>
Subject: Re: [TekScopes] Replacing Variable Vertical Attenuator Shaft

I bet that is an AB mod pot, in which case you can repair the pot with a new shaft part. What is the length of the shaft?

oh, and what part of the world are you located in.

Cheers
Alan


Tek 492BP how to save via GPIB to a PC

 

I have an 492BP, and a GPIB to USB National Instruments. Can I use the HP 7470A plotter program to save screens?
I tried and I get error borad GPIB0 not found.


Re: 547 HV Transformer: Bill Schell rewind failed

Chuck Harris <cfharris@...>
 

Hi Bernd,

All indications are that my new machine is going to
do an even better job than the best I could do with
the old manual machine.

As an example, I was able to get 2/3 of the way to a
full wind without using the rosin/alcohol mixture that
I developed to enhance the wire's friction...

Using the rosin/alcohol, I am there already.

And, I will be using beeswax.

I'm glad to hear the prototype is still soldiering
on. Soon, I may be able to get you the winds I promised
oh so long ago...

-Chuck Harris

widgethunter via groups.io wrote:

My memory certainly hasn't improved with age.Not much else seems to have, either...But, the beeswax thing I'd be willing to put money on - fwiw.
Incidentally, I still have not installed the 2nd wax xfrmr you made for me, but the 1st prototype continues to perform flawlessly.Bernd



-----Original Message-----
From: Chuck Harris <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Thu, Mar 4, 2021 4:05 pm
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

I guess the biggest indicator of a scatter wind would be
the presence of a spool.  The universal wind doesn't require
any additional support.

In addition to talking to you, I talked to Deane Kidd, and
Deane talked about Bill using beeswax, like tektronix did in
the earlier transformers.

But, like you, it has been a looong time, and I don't think
our memories are getting any better.

-Chuck Harris

widgethunter via groups.io wrote:
Hi Chuck;Assumed scatter because of the larger size of Schell rewinds.It has been a looong time, but I think I'd remember if he'd said anything about epoxy...B



-----Original Message-----
From: Chuck Harris <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Wed, Mar 3, 2021 9:57 am
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

There have been several discussions about Bill's transformers of
late, and there is a picture on the group, that looks very much
like epoxy varnish, or some other non wax compound.

However, it is most definitely not scatter wound.  It is a nice
looking, self supporting, universal wind.

Bill didn't use an outer tape covering on this transformer.  The
naked winding is right there for you to see.

-Chuck Harris










Re: Replacing Variable Vertical Attenuator Shaft

Waltzingbear
 

I bet that is an AB mod pot, in which case you can repair the pot with a new shaft part. What is the length of the shaft?

oh, and what part of the world are you located in.

Cheers
Alan


Tektronix 2205-40 SGL SWP not working

Jay Czaja
 

Hello group. I have a 2205-40 that I use to repair tube amplifiers and other simple audio stuff. Everything works perfectly on the scope except for the SGL SWP trigger. I haven't yet opened up the scope to test if the momentary switch is faulty but was wondering if there was anything else besides the switch that could potentially go wrong with this part of the scope? Also, if the switch is indeed faulty does anyone know of a suitable replacement that will fit properly as I can not find the Tektronix part (260-2290-00)? Thanks.


Re: 547 HV Transformer: Bill Schell rewind failed

widgethunter
 

My memory certainly hasn't improved with age.Not much else seems to have, either...But, the beeswax thing I'd be willing to put money on - fwiw.
Incidentally, I still have not installed the 2nd wax xfrmr you made for me, but the 1st prototype continues to perform flawlessly.Bernd

-----Original Message-----
From: Chuck Harris <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Thu, Mar 4, 2021 4:05 pm
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

I guess the biggest indicator of a scatter wind would be
the presence of a spool.  The universal wind doesn't require
any additional support.

In addition to talking to you, I talked to Deane Kidd, and
Deane talked about Bill using beeswax, like tektronix did in
the earlier transformers.

But, like you, it has been a looong time, and I don't think
our memories are getting any better.

-Chuck Harris

widgethunter via groups.io wrote:
Hi Chuck;Assumed scatter because of the larger size of Schell rewinds.It has been a looong time, but I think I'd remember if he'd said anything about epoxy...B



-----Original Message-----
From: Chuck Harris <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Wed, Mar 3, 2021 9:57 am
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

There have been several discussions about Bill's transformers of
late, and there is a picture on the group, that looks very much
like epoxy varnish, or some other non wax compound.

However, it is most definitely not scatter wound.  It is a nice
looking, self supporting, universal wind.

Bill didn't use an outer tape covering on this transformer.  The
naked winding is right there for you to see.

-Chuck Harris


Re: 547 HV Transformer: Bill Schell rewind failed

Chuck Harris <cfharris@...>
 

Hi Bernd,

I guess the biggest indicator of a scatter wind would be
the presence of a spool. The universal wind doesn't require
any additional support.

In addition to talking to you, I talked to Deane Kidd, and
Deane talked about Bill using beeswax, like tektronix did in
the earlier transformers.

But, like you, it has been a looong time, and I don't think
our memories are getting any better.

-Chuck Harris

widgethunter via groups.io wrote:

Hi Chuck;Assumed scatter because of the larger size of Schell rewinds.It has been a looong time, but I think I'd remember if he'd said anything about epoxy...B



-----Original Message-----
From: Chuck Harris <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Wed, Mar 3, 2021 9:57 am
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

There have been several discussions about Bill's transformers of
late, and there is a picture on the group, that looks very much
like epoxy varnish, or some other non wax compound.

However, it is most definitely not scatter wound.  It is a nice
looking, self supporting, universal wind.

Bill didn't use an outer tape covering on this transformer.  The
naked winding is right there for you to see.

-Chuck Harris

3801 - 3820 of 183375