Date   
Re: Tektronix 2430A Questions

Harvey White
 

On Sat, 17 Nov 2018 01:24:45 -0500, you wrote:


Thanks I am interested in that. Do you know about how much Labview would
cost to get started?”
Look at HP's Benchview, it was free the last time I looked and you may
be able to define instruments.

Harvey




I just looked in to Labview tonight. $3000! Wow, I know it’s a great tool,
and probably easier, and more versatile, to program in than VBA, or VB6,
but $3000? I’ll stick with manually writing my own test software VBA ( I
actually prefer it, because databasing collected data is a natural with
Access/VBA). Screw. Shots through a utility like OpenChoice Desktop and
GPIB is quite good. You grab a screen shot and paste it in to your
Calibration document in Word. OpenChoice. I do love my TDS3032s for that.
They are getting old too.

Dave




Re: TM500 plugin side cover retaining latch 105-0869-00.

Siggi
 

On Thu, Jan 11, 2018 at 9:19 AM Siggi <siggi@...> wrote:

Hey Rick,

I 3D modeled the two parts for these latches and did a couple of test 3D
prints. The models are fine, I think, but the printers and materials I have
access to don't make useful parts at this scale. The dimensions are off and
the strength isn't up to snuff. This may simply be due to my overabundance
of thumbs when it comes to 3D printing - I may not have sufficient
tolerance for fiddling with the print settings :/.
I uploaded the models to ShapeWays, which will do dimensionally accurate
prints with excellent strength, though I haven't tried printing them yet.
The PCB bracket I modeled for FG504 <

https://www.shapeways.com/product/CGNES54EY/tektronix-351-0449-00-pcb-bracket
has held up well, and I know others have bought prints.

I can send you my models if you'd like to try printing some yourself, or I
could make the Shapeways models available for general use. Shapeways
per-part price comes to $1.63 and $1.73 per lock button and swivel piece or
$3.63 for the pair. I'd guess by modelling e.g. 5 pairs of pieces in a
single model the per-item price might come down a bit.

I got a query about these, so I finally got off my derriere and made the
models public on ShapeWays:

https://www.shapeways.com/product/E9T64B2S3/tm500-panel-lock
https://www.shapeways.com/product/PJ6AAQLJB/tm500-panel-lock-button

ShapeWays wants $5 a piece, which seems pretty dear. I wonder if modeling
sets of these strung on a runner would make them less expensive each. I
believe the originals were independently injection molded, and printing
these on a runner would leave a blemish where the runner had to be cut off.
Also note that I've never printed these, so YMMV.

If you want to play with the model, then here's a Fusion 360 link:
https://a360.co/2QSd9KD. This is converted from the original FreeCad model,
which means the construction details of the bodies has been lost. Wonders
of file formats...

Siggi

Re: A new 547 fan

ArtekManuals
 

What is your channel?

On 11/17/2018 10:45 AM, snapdiode via Groups.Io wrote:
On Wed, Nov 7, 2018 at 08:11 PM, Rajesh VS wrote:

I am afraid that it is my channel & video.
Well I liked it. Good job!


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

Re: A new 547 fan

snapdiode
 

On Wed, Nov 7, 2018 at 08:11 PM, Rajesh VS wrote:


I am afraid that it is my channel & video.
Well I liked it. Good job!

Re: 7834 reduced scan

Fred S.
 

--I haven't checked but I am assuming the 7834 reduced scan is the same as the 7934. It works by doubling the cathode voltage on the CRT so that the deflection sensitivity in X and are each reduced by a factor of two. In normal scan you would have had a substantial overscan that you can confirm with the horizontal position control on the timebase. I don't --suppose your timebase is in X10 expansion is it?

--Roger

Hi Roger,

thank you for your advice the relay K2014 was not switching, bad solder joint.

Best regards,

Fred S.

Re: TEK 468 no power

John
 

I'd say the thermal trip would be the most likely candidate (statistically-speaking!)
John

Re: Tektronix 2430A Questions

Jim Ford
 

Yeah, Labview is easy to get a project started but not so easy to support.  We have a ton of Labview code at work, and it's a nightmare to change anything.  Trying to use Matlab from now on.Probably I will try Python to control my instruments in my garage lab at some point.Good luck!Jim FSent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: David Kuhn <Daveyk021@...> Date: 11/16/18 10:24 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Tektronix 2430A Questions “>Thanks I am interested in that.  Do you know about how much Labview would>cost to get started?”I just looked in to Labview tonight. $3000! Wow, I know it’s a great tool,and probably easier, and more versatile, to program in than VBA, or VB6,but $3000? I’ll stick with manually writing my own test software VBA ( Iactually prefer it, because databasing collected data is a natural  withAccess/VBA). Screw. Shots through a utility like OpenChoice Desktop andGPIB is quite good. You grab a screen shot and paste it in to yourCalibration document in Word. OpenChoice. I do love my TDS3032s for that.They are getting old too.Dave>>

Re: Tektronix 2430A Questions

David Kuhn
 


Thanks I am interested in that. Do you know about how much Labview would
cost to get started?”
I just looked in to Labview tonight. $3000! Wow, I know it’s a great tool,
and probably easier, and more versatile, to program in than VBA, or VB6,
but $3000? I’ll stick with manually writing my own test software VBA ( I
actually prefer it, because databasing collected data is a natural with
Access/VBA). Screw. Shots through a utility like OpenChoice Desktop and
GPIB is quite good. You grab a screen shot and paste it in to your
Calibration document in Word. OpenChoice. I do love my TDS3032s for that.
They are getting old too.

Dave



Re: Tektronix 2430A Questions

David Kuhn
 

“Do you actually have a 2430, or is it a 2430A? For a 2430A, you can
request an HP/GL screenshot by ”

I’m not in the shop right now, but I’m fairly certain it’s not an “A”.

I’m probably going to private sell this or eBay it. It works pretty good,
but I don’t have time anymore to hobby a scope. I would have loved this
scope 20 years ago. If anyone is interested PM me an offer. It would cost
$30 to have it double-boxed and then whatever the UPS or FedEx ground rate
is. It’s heavy do I would guess ~$50 shipping. With $80 shipping, no one is
going to want to pay. If you what you can get from Siglent for $380 and
no-cost shipping, who would want a 2439?

Have a good weekend everyone!

Dave

On Wed, Nov 14, 2018 at 10:13 PM John Miles <john@...> wrote:

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
David Kuhn
Sent: Wednesday, November 14, 2018 7:57 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix 2430A Questions

I think if I were to use the 2430, I would just have to take pics with
the
iPhone and email them to myself, the way I do if I am working on a CRT
base
type analog instrument that I repair and calibrate. That is kind of
disappointing being that the 2430 can store wave forms; you just can't
get
them out of it
Do you actually have a 2430, or is it a 2430A? For a 2430A, you can
request an HP/GL screenshot by sending these commands:

DEVICE TYPE:HPGL
DEVICE SETTINGS:ON,GRAT:ON,TEXT:ON,WAVFRM:ON
PRINT

... and saving the resulting ASCII data to a .plt file. In Linux you
could probably render it in GNUPlot. In Windows, you could run 7470.exe
and hit the F2 button. The scope will need to be set to talk/listen mode.

Unfortunately, the earlier 2430 (non-A) model doesn't support this, only
the 2430A, 2440, and 2432 models will work.

-- john, KE5FX





Re: germanium diodes in Tek 132 plug-in power supply

Garth Daddy
 

I have some sets of matched germanium diodes [sets of 4] if you can not find a matched pair.
Not sure of ratings have not had a need to use them. but if you need I can send.
Garth.

Re: 2465 Ch 1 probe not switching to 10x

Greg
 

If the replacement attenuator works acceptably, I’ll use it. If not, I’ll pull the bnc from the new one and use my existing attenuator. Appreciate the suggestion re the possible source, though.

When I got this scope, for free, about two months ago, the ch 1 bnc was covered with duct tape and the statement that channel 1 didn’t work. Since then, I have visually inspected all of the caps, blown out the dust, verified the lvps voltages as correct and determined that the channel 1 issue seems to be cured by chilling U600. I suspect an intermittent terminal on U600 and will clean those contacts. All channels now work correctly, and the calibration seems pretty good still. Just working on the probe sensor ring and planning a future re capping right now.

This forum has been a great resource for me.

Thanks again for the offer re the bnc.

Greg

Re: TEK 468 no power

tom jobe <tomjobe@...>
 

Just follow the AC in and check for it at each obvious point, if it gets to the main transformer, follow it on the secondary side to the full wave bridges, and so on.
This should be a simple fix...
tom jobe...

On 11/16/2018 11:06 AM, Michael Wyatt via Groups.Io wrote:
I have a Tek 468 scope my son in law bought for me for fathers day last year. It has been working fine until 2 day ago when I pushed the power button and nothing happened. Both fuses are fine I have 121.5 volts on the line side of the IEC connector, the same on both sides of the fuse and J108. No voltage anywhere else. I'm not a scope guy and have never tried to repair one. I would like to know if there is a known common point of failure I should check for first. Looking at the schematic shouldn't I see some voltage on J110 with the power switch closed? Hope this makes sense. I will try to post a picture of circuit.

any thoughts are appreciated
Michael

Re: TEK 468 no power

Siggi
 

On Fri, Nov 16, 2018 at 2:22 PM Michael Wyatt via Groups.Io <microwyatt=
yahoo.com@groups.io> wrote:

Posted pics of the circuit
IMG_0760.JPG and IMG_0761.JPG

Album for posterity: https://groups.io/g/TekScopes/album?id=78665.

Re: 2465 Ch 1 probe not switching to 10x

Siggi
 

Hey Greg,

I replaced the BNCs on my 2467 a couple of years ago. See message
https://groups.io/g/TekScopes/message/115057 for the kind gentleman who
sourced replacement BNCs for me at a very reasonable price. Maybe he has
more of those.
I'd think the precise attenuation ratios of your attenuators get baked into
the calibration, so you'll likely stay closer by replacing the BNCs than
the entire attenuator. If your scope hasn't been calibrated in the last
couple of decades or so, it may not make for a hill of beans, though :).

Siggi

On Fri, Nov 16, 2018 at 5:14 PM Greg <@Gcd133> wrote:

Ok, it appears that the bnc jack on the channel 1 attenuators is bad. The
connection to the probe ring was loose and intermittent. The bnc jacks
alone are not available for any reasonable price, so I picked up another
attenuator.

Btw, the component numbers you referred to were for the 2465b. My 2465
has the same circuit with different component numbers.

Thanks again for the pointers.

Greg



Re: 2465 Ch 1 probe not switching to 10x

Greg
 

Ok, it appears that the bnc jack on the channel 1 attenuators is bad. The connection to the probe ring was loose and intermittent. The bnc jacks alone are not available for any reasonable price, so I picked up another attenuator.

Btw, the component numbers you referred to were for the 2465b. My 2465 has the same circuit with different component numbers.

Thanks again for the pointers.

Greg

Re: TEK 468 no power

Jack
 

Apologies, Bob, you'd largely 'been there' I now see....

--
Jack

Re: TEK 468 no power

Jack
 

Hi..ok and ok....then that should be a relatively straight forward chase(?), same as with a valve-amp....no voltage at transformer = break. Are their any 'conditioner' inductors on the line side of the transformer?
Is the main switch also switching .the neutral? Is the neutral actually only a 'phantom' A broken neutral can show continuity but fail under load. Check active and neutral at the outlet....I realise this sounds 'derr' but it can happen that the neutral is supplanted by a long path to earth. In the two cases I have experienced it over 50 years, it was a loose neutral connection at the incoming mains and a loose wire at the MEN link ....however if the rest of the house is all ok...it could be the GPO (outlet) a check is only 30 seconds.for a certainty and a firm starting point . I think another chap sent you circuits.
--
Jack

Re: TEK 468 no power

Bob Albert
 

Step 2 - the fuse.  Step 3 - the power cord.  Step 3 - the line voltage selector.
You should measure contnuity across the prongs of the power plug, maybe 10 - 15 Ohms.
Bob

On Friday, November 16, 2018, 11:56:43 AM PST, Robin_Birch <@RobinBirch> wrote:

Step one - the switch

Is it getting there and is it getting out?
On 16 Nov 2018, at 19:48, Michael Wyatt via Groups.Io <microwyatt=yahoo.com@groups.io> wrote:

The measurements were taken neutral to line . I mostly work on tube amplifiers so I have a healthy respect for high voltage. I also use a isolation transformer for anything I am testing. Haven't checked the diodes yet as there seems to be no voltage getting to the primary of the transformer.

Thanks for the reply,
Michael


Re: germanium diodes in Tek 132 plug-in power supply

Albert Otten
 

It's good to known that several of these common design parts catalogs and several "reverse" parts lists (RPR) are available at Tekwiki.
But Tim "you searched with your nose" (we say in NL) in the Tek parts list (your first mail, tek_xref_free I suppose). Have a look at page 12-11, same info as in the pdf below.

Albert

On Fri, Nov 16, 2018 at 12:54 PM, Tim Phillips wrote:


Got it, Kurt; many thanks. I have some OA91 'cat's whisker' diodes which
should do the job.
I don't know whether matching the Forward Voltage drop is necessary but I
will anyway.
Tim

On Thu, 15 Nov 2018 at 17:48, Kurt Rosenfeld <kurt.harlem@...> wrote:

See page 160 of this document:

http://w140.com/tek_common_design_parts_catalog_transistors_diodes_and_misc_may_1988.pdf

Re: TEK 468 no power

 

Step one - the switch

Is it getting there and is it getting out?

On 16 Nov 2018, at 19:48, Michael Wyatt via Groups.Io <microwyatt=yahoo.com@groups.io> wrote:

The measurements were taken neutral to line . I mostly work on tube amplifiers so I have a healthy respect for high voltage. I also use a isolation transformer for anything I am testing. Haven't checked the diodes yet as there seems to be no voltage getting to the primary of the transformer.

Thanks for the reply,
Michael