Date   
Re: Tektronix 222 mini scope repair, looking for schematics

Miguel Work
 

Hi Dave!


The trick is modify charger to Supply 4,2 volt max for element, and modify main power supply to work with voltages at lithium range, 3.2 to 4.2, 6.4 to 8.4, 9.6 to 12.6 and so on.

The Tektronix 222 has a lead battery, and it haves a lead voltage temperature compensation that must be cancelled to work with lithium.

For security I only use batteries with internal protection.

Regards

Miguel



-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de Dave Voorhis
Enviado el: lunes, 21 de octubre de 2019 11:27
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] Tektronix 222 mini scope repair, looking for schematics

On 21 Oct 2019, at 10:23, Miguel Work <harrimansat@...> wrote:

I ´have complete service manual for 222 and 222A. Is more easy to modify scope charger circuit to charge lithium battery. All my old NI-CD gadgets, like my THS730, TEK 222, 221, 213, 214, now are working with lithium batteries with minimum modifications.
What were your modifications?

BTW, at least the 222 was originally lead-acid gel, not NiCad.

Re: Tektronix 222 mini scope repair, looking for schematics

Dave Voorhis
 

On 21 Oct 2019, at 10:23, Miguel Work <harrimansat@...> wrote:

I ´have complete service manual for 222 and 222A. Is more easy to modify scope charger circuit to charge lithium battery. All my old NI-CD gadgets, like my THS730, TEK 222, 221, 213, 214, now are working with lithium batteries with minimum modifications.
What were your modifications?

BTW, at least the 222 was originally lead-acid gel, not NiCad.

Re: Tektronix 222 mini scope repair, looking for schematics

Miguel Work
 

Thanks!

I ´have complete service manual for 222 and 222A. Is more easy to modify scope charger circuit to charge lithium battery. All my old NI-CD gadgets, like my THS730, TEK 222, 221, 213, 214, now are working with lithium batteries with minimum modifications.

Regards

Miguel




-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de guy232
Enviado el: lunes, 21 de octubre de 2019 1:09
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] Tektronix 222 mini scope repair, looking for schematics

Not the answer for your question but maybe it is of interest: Mr Carlson has a ~30 min video of tear down/repair/battery fabrication for the 224 on youtube. Just sharing this because I see someone mentioned it is similar to the 222. A quality video, especially in regards to the battery.

https://youtu.be/nLWVTFj_Yik

Re: Microcap12

hardyhansendk
 

Thanks
Have an old version-works great.
Regards
Hardy

-----Oprindelig meddelelse-----
Fra: TekScopes@groups.io [mailto:TekScopes@groups.io] På vegne af Craig
Sawyers
Sendt: 21. oktober 2019 09:09
Til: TekScopes@groups.io; HP-Agilent-Keysight-equipment@groups.io
Emne: [TekScopes] Microcap12

A heads up that the guy who was responsible for the full professional grade
Spice simulator Microcap
(latest version 12) has retired, and made his software downloadable free of
charge. It was $4,500
per seat before.



Download page here <http://www.spectrum-soft.com/download/download.shtm>
http://www.spectrum-soft.com/download/download.shtm



It will clearly need some time to get under the bonnet - to say it is full
featured would almost be
an understatement.



Craig









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

Re: Practicing "Safe RF" RF: DC block, RF Attenuator and/or limiter?

Tom Gardner
 

Agreed.

On my 492 I've mounted the DC block internally (and not worried about the effects of the different cable), and have a N-SMA adaptor on the external connector. The latter is small enough that the front cover still fits over it, albeit tightly.

On 21/10/19 07:33, Dave Seiter wrote:
Another advantage of using a DC block is saving the SA input connector from so many connection cycles.  On high end gear, I'd rather wear out a DC block than the actual input.
-Dave

Microcap12

Craig Sawyers <c.sawyers@...>
 

A heads up that the guy who was responsible for the full professional grade Spice simulator Microcap
(latest version 12) has retired, and made his software downloadable free of charge. It was $4,500
per seat before.



Download page here <http://www.spectrum-soft.com/download/download.shtm>
http://www.spectrum-soft.com/download/download.shtm



It will clearly need some time to get under the bonnet - to say it is full featured would almost be
an understatement.



Craig

Re: 7834 HT transformer rewind?

Craig Sawyers <c.sawyers@...>
 

Things certainly disappeared from Yahoo pre grab. I had a photo album with the internal photos of my
7912HB and some performance images, that went the way of dust years before the grab.

Maybe Karin's rewind photos went the same way.

Craig

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Seiter
Sent: 21 October 2019 07:15
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7834 HT transformer rewind?

I thought the io transfer grabbed everything; is there a known subset it ignored for some reason?
-Dave
On Sunday, October 20, 2019, 03:42:08 AM PDT, Craig Sawyers <c.sawyers@...>
wrote:

I've added the photos that Karin took of his 7934 (which IIRC is the same as the 7834) rewind. They
do
not seem to have survived the migration to io.

Craig

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Craig Sawyers
Sent: 20 October 2019 10:51
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7834 HT transformer rewind?

OK - it was Karin in 2015. The whole thread is here
https://groups.io/g/TekScopes/topic/7655243#114241

So somewhere lurking in the picture archive is the rewind photos he took.

Craig

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Craig Sawyers
Sent: 20 October 2019 10:41
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7834 HT transformer rewind?

Hi Dave,

I have a pair of 7834?s with duff HV transformers - always the EHT
winding - and remember someone on the old Yahoo group had
successfully rewound one of
these.

I remember that. Whoever it was posted some pictures of the process.

Aha - found my copy of it. A 3-page pdf dated March 2015.

Must have got it from the pictures files on Tekscopes.

Craig

Re: Practicing "Safe RF" RF: DC block, RF Attenuator and/or limiter?

Dave Seiter
 

Another advantage of using a DC block is saving the SA input connector from so many connection cycles.  On high end gear, I'd rather wear out a DC block than the actual input.
-Dave

On Sunday, October 20, 2019, 03:28:12 AM PDT, Konrad Roeder -- WA4OSH <@WA4OSH> wrote:

Greg,
To test amplifiers at work, I use a 50 Ohm attenuator with enough attenuation loss that the spectrum analyzer and power meter run near their "sweet spot".  For most lab instruments that tends to be around 0-10dBm or 1-10mW.  So to test a 50 Watt amplifier, I use a 40dB attenuator on the output side.  For the input of the amplifier, I use a coupler to sample the input signal.  I add the offset of the attenuator loss to my reading. The input power may already be at a low level like 0dBm, so the coupler might give me a signal at -30dBm for example.  In the same way, I add the coupling factor loss to my reading.

But I still want to guard my spec-an against a DC bias should I have a leaky cap or a bias-tee connected for some odd reason.  I also use a power limiter should my coupler or attenuator fail.

--Konrad

Re: 7834 HT transformer rewind?

Dave Seiter
 

I thought the io transfer grabbed everything; is there a known subset it ignored for some reason?
-Dave

On Sunday, October 20, 2019, 03:42:08 AM PDT, Craig Sawyers <c.sawyers@...> wrote:

I've added the photos that Karin took of his 7934 (which IIRC is the same as the 7834) rewind. They
do not seem to have survived the migration to io.

Craig

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Craig Sawyers
Sent: 20 October 2019 10:51
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7834 HT transformer rewind?

OK - it was Karin in 2015. The whole thread is here
https://groups.io/g/TekScopes/topic/7655243#114241

So somewhere lurking in the picture archive is the rewind photos he took.

Craig

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Craig Sawyers
Sent: 20 October 2019 10:41
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7834 HT transformer rewind?

Hi Dave,

I have a pair of 7834?s with duff HV transformers - always the EHT
winding - and remember someone on the old Yahoo group had successfully rewound one of
these.

I remember that. Whoever it was posted some pictures of the process.

Aha - found my copy of it. A 3-page pdf dated March 2015.

Must have got it from the pictures files on Tekscopes.

Craig





Re: Tektronix 222 mini scope repair, looking for schematics

ken chalfant
 

Greetings Leo,

Dave at Artekmanuals.com lists the service manual for the Tek 222.

It should be available for download or available as a CD.

His prices are extremely fair and his service is fantastic.

Good troubleshooting!

Regards,

Ken

On 20Oct, 2019, at 2:55 PM, satbeginner <@satbeginner> wrote:

Hi all,

A friend gave me 222, because it was a Tek and he knew "I have a thing" for Tektronix.
It's almost mint!, But... The readout is clearly visible, but there is no trace?
I tried inputting a signal, but I never got the triggered light to come on, nor did I got something visible but the readout.

It will be another 5 days before I get home, but meanwhile I want to think about the problem.
I looked for a manual including the schematics, but found nothing.

After the recent submerge of the microfiche set, could they be in there?
Is there anything available?

Un saludo,

Leo


Re: Tektronix 222 mini scope repair, looking for schematics

guy232
 

Not the answer for your question but maybe it is of interest: Mr Carlson has a ~30 min video of tear down/repair/battery fabrication for the 224 on youtube. Just sharing this because I see someone mentioned it is similar to the 222. A quality video, especially in regards to the battery.

https://youtu.be/nLWVTFj_Yik

Re: Tektronix 222 mini scope repair, looking for schematics

GerryR
 

I just received a manual for an older Wavetek Pulse Generator, from Artek Manuals, on CD. Very high quality and complete. I have no affiliation with them, but definitely recommend them. The sections that I printed out were very clear, including the schematics.

GerryR

----- Original Message -----
From: "ArtekManuals" <manuals@...>
To: <TekScopes@groups.io>
Sent: Sunday, October 20, 2019 5:42 PM
Subject: Re: [TekScopes] Tektronix 222 mini scope repair, looking for schematics


Leo

We have the full service manual with schematics for the 222A which I am told ( though I have no personal experience in using it to service a 222)
There are only minor differences between the 222 and the 222A

Contact me off list for details
Dave
manuals@...

On 10/20/2019 5:26 PM, johncharlesgord via Groups.Io wrote:
Leo,

Qservice has a pdf of the 224 manual, which includes schematics. The 224 and 222 are quite similar.

--John Gord

On Sun, Oct 20, 2019 at 01:55 PM, satbeginner wrote:

Hi all,

A friend gave me 222, because it was a Tek and he knew "I have a thing" for
Tektronix.
It's almost mint!, But... The readout is clearly visible, but there is no
trace?
I tried inputting a signal, but I never got the triggered light to come on,
nor did I got something visible but the readout.

It will be another 5 days before I get home, but meanwhile I want to think
about the problem.
I looked for a manual including the schematics, but found nothing.

After the recent submerge of the microfiche set, could they be in there?
Is there anything available?

Un saludo,

Leo
--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: Tektronix 222 mini scope repair, looking for schematics

ArtekManuals
 

Leo

We have the full service manual with schematics for the 222A which I am told ( though I have no personal experience in using it to service a 222)
There are only minor  differences between the 222 and the 222A

Contact me off list for details
Dave
manuals@...

On 10/20/2019 5:26 PM, johncharlesgord via Groups.Io wrote:
Leo,

Qservice has a pdf of the 224 manual, which includes schematics. The 224 and 222 are quite similar.

--John Gord

On Sun, Oct 20, 2019 at 01:55 PM, satbeginner wrote:

Hi all,

A friend gave me 222, because it was a Tek and he knew "I have a thing" for
Tektronix.
It's almost mint!, But... The readout is clearly visible, but there is no
trace?
I tried inputting a signal, but I never got the triggered light to come on,
nor did I got something visible but the readout.

It will be another 5 days before I get home, but meanwhile I want to think
about the problem.
I looked for a manual including the schematics, but found nothing.

After the recent submerge of the microfiche set, could they be in there?
Is there anything available?

Un saludo,

Leo
--
Dave
Manuals@...
www.ArtekManuals.com
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Re: Tektronix 222 mini scope repair, looking for schematics

johncharlesgord
 

Leo,

Qservice has a pdf of the 224 manual, which includes schematics. The 224 and 222 are quite similar.

--John Gord

On Sun, Oct 20, 2019 at 01:55 PM, satbeginner wrote:


Hi all,

A friend gave me 222, because it was a Tek and he knew "I have a thing" for
Tektronix.
It's almost mint!, But... The readout is clearly visible, but there is no
trace?
I tried inputting a signal, but I never got the triggered light to come on,
nor did I got something visible but the readout.

It will be another 5 days before I get home, but meanwhile I want to think
about the problem.
I looked for a manual including the schematics, but found nothing.

After the recent submerge of the microfiche set, could they be in there?
Is there anything available?

Un saludo,

Leo

Tektronix 222 mini scope repair, looking for schematics

satbeginner
 

Hi all,

A friend gave me 222, because it was a Tek and he knew "I have a thing" for Tektronix.
It's almost mint!, But... The readout is clearly visible, but there is no trace?
I tried inputting a signal, but I never got the triggered light to come on, nor did I got something visible but the readout.

It will be another 5 days before I get home, but meanwhile I want to think about the problem.
I looked for a manual including the schematics, but found nothing.

After the recent submerge of the microfiche set, could they be in there?
Is there anything available?

Un saludo,

Leo

Re: 7934/7834 transformer rewing

Sergey Kubushyn
 

On Sun, 20 Oct 2019, Craig Sawyers wrote:

I made the same mistake :) Morgan McDowell from Hamamatsu who has been very
helpful in getting manuals for my Microfocus X-Ray sources also turned out
to be a she... I've said "You are da man!" when she sent me L9181-02 manual
and that was only then she told me I'm mistaken :)

Anyway she's a very helpful lady, really appreciated. Those manuals are not
available anywhere and it was a pleasure to deal with such a helpful person.

Hi all



Much to my disgrace, I had assumed that Karin, who successfully rewound the HT transformer from hell
was a fella.



I was 100% wrong - Karin Johnson is a she.



Profuse apologies, Karin



Craig
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************

7934/7834 transformer rewing

Craig Sawyers <c.sawyers@...>
 

Hi all



Much to my disgrace, I had assumed that Karin, who successfully rewound the HT transformer from hell
was a fella.



I was 100% wrong - Karin Johnson is a she.



Profuse apologies, Karin



Craig

Re: Practicing "Safe RF" RF: DC block, RF Attenuator and/or limiter?

Don Bitters
 

I discovered years ago that some of the RF microcircuits in the HP Agilent test gear were relabeled Mini Circuits and other manufacturers of microcircuits (11729C for one), they may have been selected or customized for the HP Agilent use. I successfully repaired an 11729C with a Mini Circuits device when the HP parts was NLA.
Don Bitters

Re: Practicing "Safe RF" RF: DC block, RF Attenuator and/or limiter?

GerryR
 

Would the SMT Station Monitor from www.preciserf.com help with your needs?
Regards,
GerryR

----- Original Message -----
From: "Greg Muir via Groups.Io" <big_sky_explorer=yahoo.com@groups.io>
To: <TekScopes@groups.io>
Sent: Sunday, October 20, 2019 2:25 PM
Subject: Re: [TekScopes] Practicing "Safe RF" RF: DC block, RF Attenuator and/or limiter?


Konrad,

Thank you for your reply. I am now aware that your knowledge regarding the proper use of test equipment is very good so please accept my apologies if I assumed otherwise in my last reply.

As for DC blocks, I took a quick look at what is available on eBay and found that there is a wide array one can find for significantly low prices that appear to be of reasonable quality. One could always characterize the item before use so as to get an idea of the “true” frequency response, VSWR and so on.

A sidebar to Tom Gardner’s input regarding Mini Circuits products – I realize everyone desires to have the HP/Agilent/Keysight name on their test accessories but many times I have found that Mini Circuits product specifications often exceed those of HP/A/K including RF amplifier products especially in regards to noise figure. It is an excellent source for RF related products.

Excessive RF protection devices is another matter with respect to cost. Again you might look at the line Mini Circuits offers.

I’m not a promoter of Mini Circuits products although I have used their things for many years. I have become more impressed with their offerings as time goes on especially with the performance-to-cost aspect. When you can spend 10-20% of the cost of a HP/Agilent/Keysight product and get the same or better performance it certainly takes the sting out of purchasing an item.

Greg

Re: Practicing "Safe RF" RF: DC block, RF Attenuator and/or limiter?

Sergey Kubushyn
 

On Sun, 20 Oct 2019, Greg Muir via Groups.Io wrote:

I second that. Mini Circuits stuff is really good and performance / price
ratio is probably better than anyone's else. And they make lots of different
things.

Unless one needs something really exceptional Mini Circuits products would
probably satisfy almost any need.

Konrad,

Thank you for your reply. I am now aware that your knowledge regarding the proper use of test equipment is very good so please accept my apologies if I assumed otherwise in my last reply.

As for DC blocks, I took a quick look at what is available on eBay and found that there is a wide array one can find for significantly low prices that appear to be of reasonable quality. One could always characterize the item before use so as to get an idea of the “true” frequency response, VSWR and so on.

A sidebar to Tom Gardner’s input regarding Mini Circuits products – I realize everyone desires to have the HP/Agilent/Keysight name on their test accessories but many times I have found that Mini Circuits product specifications often exceed those of HP/A/K including RF amplifier products especially in regards to noise figure. It is an excellent source for RF related products.

Excessive RF protection devices is another matter with respect to cost. Again you might look at the line Mini Circuits offers.

I’m not a promoter of Mini Circuits products although I have used their things for many years. I have become more impressed with their offerings as time goes on especially with the performance-to-cost aspect. When you can spend 10-20% of the cost of a HP/Agilent/Keysight product and get the same or better performance it certainly takes the sting out of purchasing an item.

Greg
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************