Date   
Re: 7904 - Very Dim Trace

 

On 08 Feb 2016 18:25:32 -0800, you wrote:

To David - My HV probe is a bit suspect. I didn't want to apply 3kV to my Fluke, so I ginned up a voltage divider. It's spot on at 100V, but maybe the carbon resistors misbehave at higher voltages. Thanks for bringing this up. I'll poke around and see if I can find a decent HV probe.
To David - Yes, U1635's output measures 0.6 - 0.9V.
My guess then is that the cathode voltage is correct and it is the
probe which is a problem. Carbon resistors have a poor temperature
coefficient so self heating will be a problem and at high voltages,
their voltage coefficient will contribute a significant error as well.

To Marian and David - XY deflection is OK - certainly not off by more than a few %.
I thought you posted that the trace was "compressed".

There must be more than one problem if the trace is dim, compressed,
*and* the beam finder does not work.

The vintageTEK Museum needs your help!

 

I hope all of you on the TekScopes Forum that are local have visited the
vintageTEK museum. The museum is in its 6th year of operation at 4620A SW
Beaverton Hillsdale Highway in Portland. Donations and item sales on eBay
and in the vintageTEK webstore keep the museum operational. Up until now the
museum has benefitted from a near rent-free situation but that will be
coming to an end this year. The museum is looking for 3,000+ square feet of
space at a very affordable rate, ideally free.



Dave Brown, one of the hard working museum volunteers, put together a flyer
that shows the current museum setup and details their needs. The museum
would like more space including classroom space to do more community work
that they currently can't do because of space limitations. I placed a copy
of Dave's flyer in our archives at

https://groups.yahoo.com/neo/groups/TekScopes/files/vintageTEK%20%20Museum%2
02016%20needs.pdf



Please pass the word. I know there is space in the Portland area and we just
need to uncover it. Thanks in advance for your help and support.



Dennis Tillman W7PF

vintageTEK Museum Volunteer Curator

New file uploaded to TekScopes

TekScopes@...
 

Hello,


This email message is a notification to let you know that
a file has been uploaded to the Files area of the TekScopes
group.


File : /vintageTEK Museum 2016 needs.pdf
Uploaded by : putz_with_ear_lappers <@Dennis_Tillman_W7PF>
Description : The vintageTEK Museum needs your help!


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/TekScopes/files/vintageTEK%20%20Museum%202016%20needs.pdf


To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398


Regards,


putz_with_ear_lappers <@Dennis_Tillman_W7PF>

Re: Ebay Rip-off ? - "Global Shipping Program"

Daniel Wolstenholme
 

On Sun, Feb 7, 2016 at 10:12 PM, Sergey Kubushyn <ksi@... mailto:ksi@...> wrote:
>>> Note, you no longer get any discount when you buy postage from USPS
>>> (Click-n-Ship). It's better to use PayPal shipping.
>
>> Nope, I would not pay a single cent over that constantly growing fee they
>> already charged me.

>I don't believe it would. Exactly like their GSP that claimes to save you a
>million but in reality is something that is better to be avoided at all
>costs like a plague.

Your beliefs do not match with reality. Go look at the prices yourself. Paypal's shipping charges the USPS Commercial Base Rate. There's no extra fees for it, it's a perk they provide to get people to use Paypal. If Click-n-Ship isn't using the Commercial Base Rate any more, then they're automatically more expensive.

>>> Then, last time I checked (long ago but I seriously doubt they fixed it and
>>> 100% sure they added a ton of stupid bells and whistles since then) it did
>>> _NOT_ work with Linux Firefox and did not offer USPS pickups.
>>
>> PayPal shipping does work in current Firefox. I don't see why it
>> would be different on Linux.

Because the entire thing is totally taken by script kiddies putting more and
more Java[,script] crap onto it with new bangwhiz frameworks and so on. And
all this is being constantly put on production servers without any testing
so nobody already gets surprised that some part of it is not working, some
of personal stuff comes and goes, search is totally unusable and so on.
You have no idea what you're talking about. I've been printing mailing labels with Paypal on Linux for years. It was a lot more problematic when Pitney-Bowes insisted on using their stupid Java applet, but that's been gone for a while. Now it works just fine in Linux/Firefox. You fill in the fields, click to pay for the label, and then a new tab opens with your mailing label in PDF format, ready to print (or save). It's not perfect; their new label-purchasing UI is worse than the old version, but everything is like that these days because everyone wants new "mobile-friendly" UIs everywhere. Just look at how butt-ugly Windows is now.

Anyway, the USPS CLick-n-ship service to me is completely unusable anyway because (unless it's changed recently) it doesn't offer First Class parcel service, only Priority.

Re: OT: Win 8.1 and 10?

Richard R. Pope
 

Hello all,
Would anyone be interested in seeing pictures of my new system. The hardware is mostly finished until I start installing the liquid cooling system.
Thanks,
rich!

On 2/8/2016 8:23 PM, Peter Gottlieb hpnpilot@... [TekScopes] wrote:
Win7 (as well as others) have detection of various hardware as DRM. How well
does that work in the VM realm?

I did one project (FAA approved software) where everything had to be kept for a
very long period, including source and executables, and had to be able to be
recompiled with the exact bitwise match. I chose a VM environment to do this
and always wondered what would happen if the VM files were tried many years
later on a different machine. Would Microsoft DRM block operation?

So what about all the scopes with Windows in them? Upgrading those is probably
a non-starter.

Peter

Re: TDS 380 calibration and vertical scale problem

David Wilson
 

Ed, I am back tracking my work and also bare to mind I a bit of a novice when it comes to this so I can be wrong from inexperience and I am glad you asked.

I reran a simple test of measuring the inputs resistance of both channels in dc coupling. I put the red probe on the center of the BNC and the black probe on the shield to get my resistance measurements for this test. For Ch1 between 10v-100mV I got 2 mega ohms and between 99mV-2mV I got 1 Mega ohm, this is with the channel in DC coupling. Ch2 I flat out couldn't get a resistance measurement regardless of the vertical scale setting in dc coupling mode. So I hope this rules out that my inputs are not 50 ohms at least in dc coupling.


As for how I got the 50 ohms resistance measurement, if you click on this link here https://groups.yahoo.com/neo/groups/TekScopes/photos/photostream/lightbox/1837724209?orderBy=mtime&amp;sortOrder=desc&amp;photoFilter=ALL#zax/1837724209 it will take you to my album for this group and open a close up picture of the TDS 380 hybrid. In this picture if you look at the bottom you will see the BNC input and if you look just above that you will see the first relay. I got my 50 ohm measurement when I put one probe of my multi meter on the center conductor lead coming out of the BNC and into the input of the hybrid. I placed my other probe on the common pin of the first relay. Note that this relay has 10 pins and that I determined the center pins for each side is common. The common pin I used is on the top side of this relay as shown with the orientation of this picture. Measuring at these two points I got my 50 ohms for channel 1. Repeating this process for channel 2 I could not get any resistance reading on these points, this is how I concluded I have a blown 50 ohm resister, especially with this link http://www.antiqueradios.com/forums/viewtopic.php?p=1816411 I was provided if you haven't already seen it. Seeing the back side of the hybrid for TDS 420, though it might be a little different, the trace on the underside and how it goes across from the input through the resister to about the point near where I measured from common, that is how I came to my conclusion.


And you asked about creating a flow diagram of the hybrid on the 380, that wouldn't be a bad idea. Before I pull any hybrid it I will study it and its operating state and then formulate a illustration and present it here. A picture is worth a thousand words or even several thousand.

Re: OT: Win 8.1 and 10?

Richard R. Pope
 

R.L.,
Who are you addressing??
Thanks,
rich!

On 2/8/2016 9:38 PM, 'R.L. Wurdack' dickw@... [TekScopes] wrote:

This is madness!

----- Original Message -----
From: lea56@... [TekScopes]
To: TekScopes@...
Sent: Monday, February 08, 2016 7:11 PM
Subject: Re: [TekScopes] OT: Win 8.1 and 10?

Oh agree to that, Dave! Nice when knowledge speaks out. ;)

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Re: OT: Win 8.1 and 10?

Richard L. Wurdack
 

This is madness!

----- Original Message -----
From: lea56@... [TekScopes]
To: TekScopes@...
Sent: Monday, February 08, 2016 7:11 PM
Subject: Re: [TekScopes] OT: Win 8.1 and 10?



Oh agree to that, Dave! Nice when knowledge speaks out. ;)

Re: OT: Win 8.1 and 10?

Richard R. Pope
 

Peter,
I'll keep that in mind. This is a long term project. I can only
work on it as money becomes available. I suspect that it will take me
two years to complete this system.
Thanks,
rich!

On 2/8/2016 9:10 PM, Peter Gottlieb hpnpilot@... [TekScopes] wrote:

If you need to, SoftwareKing offers legitimate keys to MS Office for
direct download from MS for $95. My wife needed it and I downloaded
and activated without problems.

Not free but if you must have it the price isn't insane.

Peter

On Feb 8, 2016, at 10:04 PM, 'Richard R. Pope'
mechanic_2@... [TekScopes] <TekScopes@...> wrote:

Mitch,
I am going to try O2000 first. Then go from there.
Thanks,
rich!

On 2/8/2016 9:02 PM, n4mf_sc@... [TekScopes] wrote:

I have Office 2007 Pro installed here and the Open Office 4.1.2
package. Open Office get's used first, only then do I go to M$ Office
if it is a requirement. OO4 will open and save to any of the M$ Office
files. Best thing, it's free.

Mitch
N4MF

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Yahoo Groups Links




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Re: OT: Win 8.1 and 10?

Richard R. Pope
 

R.L.
I'll look in to LibreOffice.
Thanks,
rich!

On 2/8/2016 9:25 PM, 'R.L. Wurdack' dickw@... [TekScopes] wrote:

Libre Office is much better IMHO.

----- Original Message -----
From: Peter Gottlieb hpnpilot@... [TekScopes]
To: TekScopes@...
Sent: Monday, February 08, 2016 7:07 PM
Subject: Re: [TekScopes] OT: Win 8.1 and 10?

I suggest also using LibreOffice. OpenOffice writer recently gave me
some problems but LibreOffice writer was more compatible with the
newest MS Office Word.

Peter

On Feb 8, 2016, at 9:50 PM, n4mf_sc@... [TekScopes]
<TekScopes@...> wrote:

Just D/L Open Office 4.1.2. Keep "your" change in "your" pocket.

Mitch
N4MF



[Non-text portions of this message have been removed]

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[Non-text portions of this message have been removed]

Re: OT: Win 8.1 and 10?

Richard L. Wurdack
 

Libre Office is much better IMHO.

----- Original Message -----
From: Peter Gottlieb hpnpilot@... [TekScopes]
To: TekScopes@...
Sent: Monday, February 08, 2016 7:07 PM
Subject: Re: [TekScopes] OT: Win 8.1 and 10?



I suggest also using LibreOffice. OpenOffice writer recently gave me some problems but LibreOffice writer was more compatible with the newest MS Office Word.

Peter

> On Feb 8, 2016, at 9:50 PM, n4mf_sc@... [TekScopes] <TekScopes@...> wrote:
>
> Just D/L Open Office 4.1.2. Keep "your" change in "your" pocket.
>
> Mitch
> N4MF
>
> [Non-text portions of this message have been removed]
>
>

2465 scopes with poor vertical linearity

Kerry Banke <kbanke@...>
 

Hi all, I'm new to this group and looking for experience/advice.I maintain a bank of loaner test equipment for Hams in the San Diego area and have at least two Tek 2465 scopes that work fine other wise but the traces shrink vertically near the bottom of the scope so are nonlinear in that region. Any comments to help save me some troubleshooting time? Thanks - Kerry N6IZW

Re: OT: Win 8.1 and 10?

lawrenceahlstrom
 

Oh agree to that, Dave! Nice when knowledge speaks out. ;)

Re: OT: Win 8.1 and 10?

Peter Gottlieb
 

If you need to, SoftwareKing offers legitimate keys to MS Office for direct download from MS for $95. My wife needed it and I downloaded and activated without problems.

Not free but if you must have it the price isn't insane.


Peter

On Feb 8, 2016, at 10:04 PM, 'Richard R. Pope' mechanic_2@... [TekScopes] <TekScopes@...> wrote:

Mitch,
I am going to try O2000 first. Then go from there.
Thanks,
rich!

On 2/8/2016 9:02 PM, n4mf_sc@... [TekScopes] wrote:

I have Office 2007 Pro installed here and the Open Office 4.1.2
package. Open Office get's used first, only then do I go to M$ Office
if it is a requirement. OO4 will open and save to any of the M$ Office
files. Best thing, it's free.

Mitch
N4MF

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------------------------------------

------------------------------------


------------------------------------

Yahoo Groups Links


Re: OT: Win 8.1 and 10?

Peter Gottlieb
 

I suggest also using LibreOffice. OpenOffice writer recently gave me some problems but LibreOffice writer was more compatible with the newest MS Office Word.


Peter

On Feb 8, 2016, at 9:50 PM, n4mf_sc@... [TekScopes] <TekScopes@...> wrote:

Just D/L Open Office 4.1.2. Keep "your" change in "your" pocket.

Mitch
N4MF

[Non-text portions of this message have been removed]


[Non-text portions of this message have been removed]

Re: OT: Win 8.1 and 10?

Richard R. Pope
 

Mitch,
I am going to try O2000 first. Then go from there.
Thanks,
rich!

On 2/8/2016 9:02 PM, n4mf_sc@... [TekScopes] wrote:

I have Office 2007 Pro installed here and the Open Office 4.1.2
package. Open Office get's used first, only then do I go to M$ Office
if it is a requirement. OO4 will open and save to any of the M$ Office
files. Best thing, it's free.

Mitch
N4MF

[Non-text portions of this message have been removed]

Re: OT: Win 8.1 and 10?

n4mf_sc
 

I have Office 2007 Pro installed here and the Open Office 4.1.2 package. Open Office get's used first, only then do I go to M$ Office if it is a requirement. OO4 will open and save to any of the M$ Office files. Best thing, it's free.

Mitch
N4MF

Re: OT: Win 8.1 and 10?

Richard R. Pope
 

Mitch,
I have office 2000. It is going to interesting to see if it will
run under 8.1.
Thanks,
rich!

On 2/8/2016 8:50 PM, n4mf_sc@... [TekScopes] wrote:

Just D/L Open Office 4.1.2. Keep "your" change in "your" pocket.

Mitch
N4MF

[Non-text portions of this message have been removed]

Re: OT: Win 8.1 and 10?

n4mf_sc
 

Just D/L Open Office 4.1.2. Keep "your" change in "your" pocket.

Mitch
N4MF

Re: 7904 - Very Dim Trace

Jim McIntyre
 

One other minor clue -

the 'A' sweep, 'B' sweep, and on-screen readout are all affected in the same way...