Date   
Re: 2465B - Weak Readout Intensity

Chuck Harris
 

The trigger hybrid triggers the A and B time base hybrids,
and they feed their gate signals (/SG) into the the PAL U975,
which chews on them, and feeds FF U980B, which talks back to
the PAL, which passes it on using /SGB goes back to the
trigger hybrid, and display sequencer.

So, it could be the trigger hybrid, the sweep hybrids, the
PAL (clean its socket), and U980B's flip-flop.

There is a Parametric Measurements flow chart, you should look
at.

My recollection is it is usually the trigger hybrid, the trigger
hybrid's socket, or the PAL's socket.

-Chuck Harris

flanneltuba@... wrote:

I tried cleaning and deox'ing the Trigger Hybrid, but the problem remained. Swapped it out with another chip, and still not change, or at least no meaningful change. (Curiously the error text from the chip out of a 2465 was just, "NOISEY OR APERIODIC SIGNAL" without the "CH1:" prefix.)

I tried feeding a higher signal amplitude into the scope, 2v PP instead of 500mv PP, with no change. Then tried some higher frequencies. Previously I had used 5kHz; I bumped it up to 20MHz and the scope at least made an attempt to read the signal frequency, but it was way off. It assessed the 20MHz signal to be 33.94MHz. The same signal measured with the cursors on 1/t was right at 20.4MHz. See the pics I posed at the top of the Album: https://groups.io/g/TekScopes/album?id=241733

The auto Measure feature does take correct aptitude readings. It read a 2.0v PP 2kHz sine wave right at 1.998v PP. There's some hope, I suppose. Aside from giving it a real calibration, it does seem to be working quite well. I was able to get it to trigger on and display a signal up at 1.0 GHz, though the cursors marked it at 797MHz. Not bad!

So it's down to this last little foible. I can certainly live w/o the frequency measurement feature, but, heck, why stop short of perfect?

Any other thoughts on my aperiodic little 2465B?



Re: 2465B - Weak Readout Intensity

flanneltuba@...
 

I tried cleaning and deox'ing the Trigger Hybrid, but the problem remained. Swapped it out with another chip, and still not change, or at least no meaningful change. (Curiously the error text from the chip out of a 2465 was just, "NOISEY OR APERIODIC SIGNAL" without the "CH1:" prefix.)

I tried feeding a higher signal amplitude into the scope, 2v PP instead of 500mv PP, with no change. Then tried some higher frequencies. Previously I had used 5kHz; I bumped it up to 20MHz and the scope at least made an attempt to read the signal frequency, but it was way off. It assessed the 20MHz signal to be 33.94MHz. The same signal measured with the cursors on 1/t was right at 20.4MHz. See the pics I posed at the top of the Album: https://groups.io/g/TekScopes/album?id=241733

The auto Measure feature does take correct aptitude readings. It read a 2.0v PP 2kHz sine wave right at 1.998v PP. There's some hope, I suppose. Aside from giving it a real calibration, it does seem to be working quite well. I was able to get it to trigger on and display a signal up at 1.0 GHz, though the cursors marked it at 797MHz. Not bad!

So it's down to this last little foible. I can certainly live w/o the frequency measurement feature, but, heck, why stop short of perfect?

Any other thoughts on my aperiodic little 2465B?

Re: New 2465 Seimens brushless motor

n4buq
 

Hi Greg,

The P/N for the fan motor in the 8640B manual (TM 9-4935-601-14-7&P) shows it to be 1AD3001-OA.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Greg Muir via Groups.Io" <big_sky_explorer=yahoo.com@groups.io>
To: TekScopes@groups.io
Sent: Sunday, February 23, 2020 3:27:48 PM
Subject: Re: [TekScopes] New 2465 Seimens brushless motor

Barry,

The fan in the HP 8640B is a simple 2-terminal DC motor. The Siemens device
is a 13-terminal brushless Hall Effect motor that requires external
excitation from a more elaborate switching driver scheme.

Greg



Re: 211 Replacement Batteries

 

It was pretty stupid of me to forget the link.
This is the email I wrote years ago:

Note: the link is broken across 3 lines.
It is very hard to find this battery pack on this site so use the link.
Dennis Tillman W7pF

On Tue, Sep 5, 2017 at 11:50 PM, 'Dennis Tillman' @Dennis_Tillman_W7PF
[TekScopes] <TekScopes@...> wrote:

Hi Harvey,

Fortunately there is a great company that makes exact replacement battery
packs for the 214 and they are very inexpensive.
Here is a link:
http://www.bulbtronics.com/Search-The-Warehouse/
SearchResults.aspx?stype=Aut
oLampEq&mfg=TEKTRONIX&mod=OSCILLOSCOPE%20212

It's tough getting there. It's under Medical and Scientific batteries.
The company that makes them is called BulbTronics. They are the ones that
supplied me with the batteries for my 214 scope.

The battery packs they made up were a perfect fit, very professionally
made,
and dirt cheap. The scope ran for over 5½ hours on them which was almost
twice the Tek specification.

Best thing to do is go to their web site and fill out an email request.
This
is the way you have to request that they make up a pack for you. It's more
than a little strange but it is worth it. You will appreciate that when the
batteries arrive.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
greenboxmaven via Groups.Io
Sent: Sunday, February 23, 2020 1:04 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 211 Replacement Batteries

Please share the link you mentioned so I can check out their batteries.
ALSO, beware that the power supply sections of some of the "2XX" models that
use these batteries will not regulate unless a good battery is installed,
and will send excessive voltages to the rest of the circuitry. Thanks,
Bruce KA2IVY


On 2/23/20 2:44 PM, Dennis Tillman W7PF wrote:
Hi Bob,
If that is the case then you are in luck because this link will
connect you with a company that makes an identical replacement for the
Tek batteries.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Bob Wilson
Sent: Sunday, February 23, 2020 11:20 AM
To: TekScopes@groups.io
Subject: [TekScopes] 211 Replacement Batteries

Yesterday I bought a model 211 scope at the Dalton hamfest. While it
works I need to replace the batteries.













--
Dennis Tillman W7PF
TekScopes Moderator

Re: 547 scope HV transformer problem. One practical solution.

Morris Odell
 

I have washed many 500 series scopes (and other boatanchors) over the years without any fancy equipment and have had very good results. I posted a set of photos a few years ago of a 547 wash and you can find it here in the photos section. You need to pick a time and place when there will be several hot days in a row - here in Australia it's usually around this time of year and the temp can be 90-100F for days. Pull the tubes, CRT, fan, pluggable transistors and anything else easily removable or loseable taking care to label them so they can be reinstalled to the right places. Take it outside for a scrub down with a brush and detergent solution and rinse it down with the garden hose - fortunately the water where I live is pretty soft. Try to avoid flooding the power and HV transformers. Leave it outside in the direct sun for a day or two to dry. If you want to bake it even hotter, you could put it in a car parked in the sun but I haven't tried that. I do the knobs separately in the sink with detergent and an old toothbrush, a squirt with something like WD40 restores the shine nicely. Lubricate the shaft bushings and switches when you reassemble it.

It will look like new and after an electronic overhaul and cal, should behave like new too.

Morris

Re: New 2465 Seimens brushless motor

Greg Muir
 

Barry,

The fan in the HP 8640B is a simple 2-terminal DC motor. The Siemens device is a 13-terminal brushless Hall Effect motor that requires external excitation from a more elaborate switching driver scheme.

Greg

Re: 211 Replacement Batteries

David Holland
 

https://www.bulbtronics.com

Part # 5149

The search for Oscilloscope 212 doesn't work, but its listed under the
"Equipment using this product" tab....

David


On Sun, Feb 23, 2020 at 4:06 PM greenboxmaven via Groups.Io <ka2ivy=
verizon.net@groups.io> wrote:

Please share the link you mentioned so I can check out their batteries.
ALSO, beware that the power supply sections of some of the "2XX" models
that use these batteries will not regulate unless a good battery is
installed, and will send excessive voltages to the rest of the
circuitry. Thanks, Bruce KA2IVY


On 2/23/20 2:44 PM, Dennis Tillman W7PF wrote:
Hi Bob,
If that is the case then you are in luck because this link
will connect you with a company that makes an identical replacement for
the
Tek batteries.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Bob
Wilson
Sent: Sunday, February 23, 2020 11:20 AM
To: TekScopes@groups.io
Subject: [TekScopes] 211 Replacement Batteries

Yesterday I bought a model 211 scope at the Dalton hamfest. While it
works
I need to replace the batteries.











Re: 211 Replacement Batteries

greenboxmaven
 

Please share the link you mentioned so I can check out their batteries. ALSO, beware that the power supply sections of some of the "2XX" models that use these batteries will not regulate unless a good battery is installed, and will send excessive voltages to the rest of the circuitry. Thanks, Bruce KA2IVY

On 2/23/20 2:44 PM, Dennis Tillman W7PF wrote:
Hi Bob,
If that is the case then you are in luck because this link
will connect you with a company that makes an identical replacement for the
Tek batteries.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Bob
Wilson
Sent: Sunday, February 23, 2020 11:20 AM
To: TekScopes@groups.io
Subject: [TekScopes] 211 Replacement Batteries

Yesterday I bought a model 211 scope at the Dalton hamfest. While it works
I need to replace the batteries.







Re: 211 Replacement Batteries

 

Hi Bob,
Years ago I posted this information about the batteries I found for the
model 214 which I own. With a little research comparing the battery size of
your 211 to my 214 I think you will find the 211 uses the same rechargeable
battery pack. If that is the case then you are in luck because this link
will connect you with a company that makes an identical replacement for the
Tek batteries. The cost was dirt cheap, and they were absolutely perfect
plugin replacements. The quality was excellent.
The new batteries ran my 214 50% longer than the specification in the
Service Manual showed the original batteries were capable of.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Bob
Wilson
Sent: Sunday, February 23, 2020 11:20 AM
To: TekScopes@groups.io
Subject: [TekScopes] 211 Replacement Batteries

Yesterday I bought a model 211 scope at the Dalton hamfest. While it works
I need to replace the batteries.

He seller already has the batteries out and I assume they are bad. It works
without the batteries installed but maybe it not good to run it that way.

My question is what kind of batteries can I use?

It came with Nicad but NiMH are common these days. If I had my choice I
would like Eneloop batteries or something like that so they would hold there
charge for a long time.

Bob








--
Dennis Tillman W7PF
TekScopes Moderator

Re: New 2465 Seimens brushless motor

GerryR
 

I have a 2465A but don't have any idea where a motor like that is used. Any help??
Thanks,
GerryR
KK4GER

----- Original Message -----
From: "n4buq" <n4buq@...>
To: <TekScopes@groups.io>
Sent: Sunday, February 23, 2020 2:20 PM
Subject: Re: [TekScopes] New 2465 Seimens brushless motor


I'm not 100% sure, but I think that same motor is used in the HP 8640B (and, possibly, other models) as well.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "victor.silva via Groups.Io" <daejon1=yahoo.com@groups.io>
To: TekScopes@groups.io
Sent: Sunday, February 23, 2020 9:15:44 AM
Subject: [TekScopes] New 2465 Seimens brushless motor

I am not associated with this seller.

I found a seller on ebay selling the Seimens 1AD3001-0A brushless motors for
a reasonable price.
The shipping is steep for USA Parcel Post, but the total cost to buy is ok.

These motors are used in most of the Tek 2465 and some 2465A, 2465B(w/option
01).

https://www.ebay.com/itm/Siemens-1AD3001-OA-Motor-10-15volts/274013390896

--Victor



Re: New 2465 Seimens brushless motor

n4buq
 

I'm not 100% sure, but I think that same motor is used in the HP 8640B (and, possibly, other models) as well.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "victor.silva via Groups.Io" <daejon1=yahoo.com@groups.io>
To: TekScopes@groups.io
Sent: Sunday, February 23, 2020 9:15:44 AM
Subject: [TekScopes] New 2465 Seimens brushless motor

I am not associated with this seller.

I found a seller on ebay selling the Seimens 1AD3001-0A brushless motors for
a reasonable price.
The shipping is steep for USA Parcel Post, but the total cost to buy is ok.

These motors are used in most of the Tek 2465 and some 2465A, 2465B(w/option
01).

https://www.ebay.com/itm/Siemens-1AD3001-OA-Motor-10-15volts/274013390896

--Victor



211 Replacement Batteries

Bob Wilson
 

Yesterday I bought a model 211 scope at the Dalton hamfest. While it works
I need to replace the batteries.

He seller already has the batteries out and I assume they are bad. It works
without the batteries installed but maybe it not good to run it that way.

My question is what kind of batteries can I use?

It came with Nicad but NiMH are common these days. If I had my choice I
would like Eneloop batteries or something like that so they would hold there
charge for a long time.

Bob

Re: Tekprobe 1103 PSU mod. advice

 

Hi Mark..
Thank you for the links. Seems those threads have gone quiet. It might mean that the developers had no plans to offer a commercial outcome, but they supported open sourcing, or demand isn't there.
You're correct in that my concept appears to be a hybrid of the two links. USB powered plus direct cable free installation. Seems Probe Offset voltage adj. is not an in demand feature which answers one of my constraint concerns adequately.
The build in the first link is remarkably close to my physical concept, leveraging the proven laser cut acrylic approach to sandwich the PCB as I did with the SG 504 leveling head since 2016.

Well...it's still a back burner item for now.
thanks again.
~A

Re: New 2465 Seimens brushless motor

Greg Muir
 

It is Tek part number 147-0035-00 and will fit Tek 465, 465B, 466, 464, 475, 475A, 475M, 2445 & 2465 series scopes.

Greg

Re: Weird 466 horizontal glitch--SOLVED

Mlynch001
 

Power supply voltage and power quality are the foundation of everything else. This was and remains the most important lesson for me when working with these scopes.

--
Michael Lynch
Dardanelle, AR

Re: 2465B - Weak Readout Intensity

flanneltuba@...
 

Thanks, Chuck. I'll do a careful inspection and deoxit cleaning of the Trigger Hybrid chip. I do have a 2465 (two, actually) that I can borrow a known good chip from if necessary as well.

Tony: As for the photos, below is a copy/paste link from the TekScopes Photos gallery of the Album I created earlier, which includes various pictures from this project from day 1 through the present. Nothing spectacular but no doubt familiar "before" type scenes for many of you, showing visibly sad 2465B boards and parts.

Here's the link. Let me know if it does not work: https://groups.io/g/TekScopes/album?id=241733

Thanks,

- Scott

Re: 2465B - Weak Readout Intensity

Chuck Harris
 

That means that the trigger hybrid, which does all of the
time and frequency measurements in the "B" model, is having
trouble triggering on the signals you are presenting to it.

You can try removing the hybrid, and putting a drop of
deoxit on each of its terminals, but most times I find that
the hybrid is bad.

On the bright side, all of the 2465 family trigger hybrids
work in all of the models.

One note, hybrids are wicked easy to break. Be sure that
you have rotated, and wiggled, and set the hybrid flat
down on the board with hand pressure as you are spinning
up the nuts. If you don't, it will sometimes catch the
edge of the ceramic substrate, and crack! You are done.

I use a plastic nut starter, like Heathkit used to include
in their kits, to do the initial nut setting, and finger
tightening: Set all of the nuts, head up, star washer down
on your bench where you can reach them one handed. Install
them, and tighten them as much as the plastic nut setter
will, all the while holding the hybrid down with your other
hand.

When you have done that, use a nutdriver to tighten the nuts
an additional 1/8 to 1/4 turn. This is only to keep the nuts
from working loose due to vibration.

The tightness of the nuts has nothing to do with the quality
of the connections to the hybrid!

-Chuck Harris

flanneltuba@... wrote:

I am finally getting this scope to the point of getting ready to do a full, albeit low precision calibration (+/-10% will be fine for my purposes, and within my reference equipment range). I am seeing one issue with the built in Time/Freq Measurement function. Regardless of the purity of the signal I apply, in the case of the picture, a 5 MHz sine wave from a good source, when I select wither T or 1/T Measurement the alert text "CHx: NOISY OR APERIODIC SIGNAL" is show and no time or frequency measurement is given.

I searched the internet and scoured the manual for any reference to this message, but found nothing.

Perhaps one of you might be familiar with this message/symptom. I will note that I have not yet attempted to do a full calibration on this, but most of the readings are well within reason, if measured by the cursors or screen graticules.

( I posted a picture of the screen shot of this, among others, in the Photos directory on the TekScopes@groups.io web page, but don't know how to link to those pictures here.)

Thanks,

- Scott



Re: 2465B - Weak Readout Intensity

Tony Fleming
 

Let me know where are the pictures, when I went to TekScopes.io there
aren't the picture you are referring to.
Have a great weekend.

On Sun, Feb 23, 2020 at 10:34 AM <flanneltuba@...> wrote:

I am finally getting this scope to the point of getting ready to do a
full, albeit low precision calibration (+/-10% will be fine for my
purposes, and within my reference equipment range). I am seeing one issue
with the built in Time/Freq Measurement function. Regardless of the purity
of the signal I apply, in the case of the picture, a 5 MHz sine wave from a
good source, when I select wither T or 1/T Measurement the alert text "CHx:
NOISY OR APERIODIC SIGNAL" is show and no time or frequency measurement is
given.

I searched the internet and scoured the manual for any reference to this
message, but found nothing.

Perhaps one of you might be familiar with this message/symptom. I will
note that I have not yet attempted to do a full calibration on this, but
most of the readings are well within reason, if measured by the cursors or
screen graticules.

( I posted a picture of the screen shot of this, among others, in the
Photos directory on the TekScopes@groups.io web page, but don't know how
to link to those pictures here.)

Thanks,

- Scott



Re: 547 scope HV transformer problem. One practical solution.

stevenhorii
 

Albert,

Thanks! That was it! I have never seen another one of these.

Steve

On Sun, Feb 23, 2020, 09:38 Albert Otten <aodiversen@...> wrote:


I also had an oddball 7000-series that I
think was a short-lived precursor of the 7854. It had a section in
between
the plug-ins and the display that, like the 7854, had a number of
waveform
computing functions. I don’t recall the number and I no longer have it -
I
sold it at a hamfest. Also, I don’t see it on TekWiki.
Steve, that might have been a 7704A with P7001 DPO.
http://w140.com/tekwiki/wiki/P7001
Albert



Re: 547 scope HV transformer problem. One practical solution.

 

Hi fiftythreebuick,

A thread about the 555 is a great idea. It could be very educative for those of us who have never seen one in person.
For example, you could describe what is your convenience of having a dual beam over a single beam with multiple channels.
And how or if you have done routine maintenance of this scope.

Regards,
Ernesto