Hi Dave,

If you look at this video https://urldefense.com/v3/__https://www.youtube.com/watch?v=Z_gvjmKHN4Y__;!b9GWhakWANQ!wEpfxjysOXjFgv3ZjJzwPT00sPf81J7-h9F-OyCNJMU1-f5Y3AG4Mbyun-yU$ it shows a part number on the back of the display as 65BLM04 and on the front of the display the tag says NL6448BC20-08.  If you search each of these part numbers on ebay, the price is very different when they are actually the same part.   The cheapest price I could find for the 65BLM05 is $158.74 (used), while the cheapest price for the NL6448BC20-08 is $88 for a new part. These appear to be exactly the same part.  Any idea if there is any difference?

Tom

On 11/7/2019 2:28 PM, David Kuhn wrote:

https://urldefense.com/v3/__https://www.youtube.com/watch?time_continue=261&;v=iVU0YPIeovM__;!b9GWhakWANQ!wbXzExaWmEY10yA6ddr1j7dzMVPNV7j4iMLI9u6paEFuQ5tXhS6mqOV8S_HN$

https://urldefense.com/v3/__http://lcdparts.net/UBDetail.aspx?ProductID=3796__;!b9GWhakWANQ!wbXzExaWmEY10yA6ddr1j7dzMVPNV7j4iMLI9u6paEFuQ5tXhS6mqCtAAjYv$

Looks like a perfect solution for the NEC on the TDS3000 series and in the
NEC 65BLM05 Display (virtually the same display as the one TEK uses) in the
instruments I do a lot of work on.

Unlike the video, I would not remove the paper exposing the glue when
installing the strips.  I don't want those LED strips permanently in my
LCDs in case they fail.

Dave

On Wed, Nov 6, 2019 at 11:40 PM Harvey White <madyn@dragonworks.info> wrote:

On Jan 2, 2020, at 10:24 AM, Victor via Groups.Io <vmcfer=aol.com@groups.io> wrote:


Hi Dennis,
I just read your message and sent you my contribution of USD20.00.Thank you for the great job and effort you are doing all the year.This is a fantastic group. Love it !!!Wish you a Happy New Year 2020.Victor(vmcfer@aol.com)

-----Original Message-----
From: Dennis Tillman W7PF <dennis@ridesoft.com>
To: TekScopes <TekScopes@groups.io>
Sent: Tue, Dec 31, 2019 4:42 am
Subject: [TekScopes] MEMBERS PLEASE READ: Our annual Group.io payment is due in 2 weeks.

Hello everybody,
In a few minutes it will be 2020. This is much further into the future than
I thought I'd ever see. Years ago I was sure someone would have developed a
tiny ultra-thin LED display that can be imbedded into a credit card by 2020.
It would display your current outstanding balance every time the card was
inserted in a reader. If my non-futuristic credit cards only had this
imbedded into them I would certainly not be in my present predicament. I
maxed out both cards and my wife took them away. I found this puzzling
because the cards still look the same even though they don't work anymore.
It is clear to her that she can't afford to keep me. She has made this very
clear to me often in the past 2 weeks.

Since we moved to Groups.io I have been paying the annual fee they charge to
host us. I did this for two reasons:
* It was expedient when we first joined because the demise of Yahoo seemed
imminent and this was the fastest way to get up and running on Groups.io.
* Later when I asked for suggestions on alternate ways to pay for Groups.io
I didn't see anything I liked. I thank you for all of them, they were all
fine. It seemed as if they would create extra work and, more importantly,
consume more of my time (which is in very short supply). I kept each of your
suggestions for future consideration.

In 2 weeks the total amount I will have paid will be $340. This is
significant enough that I have to do something about it, and more
importantly, I need to get back into my wife's good graces. So I am asking
for small contributions via PayPal if possible to be sent to
dennis@ridesoft.com. If you include a note along with each contribution
saying it is for Groups.io that will make it easier to track. See the
postscript at the end of my post for a no-fee way to send money with PayPal.

If PayPal doesn't work for you my address is 13808 NE 26th Place, Bellevue,
WA 98005 USA. If you have an extremely rare or unusual 7000 series plugin
that is definitely an acceptable form of payment but I must advise you I
probably already have it so contact me first.

I plan to give an accounting of the total to the group once the
contributions stop. Anything over $340 will be set aside. I will find out if
Groups.io will let me pay for the following year (or years) so we don't have
to worry if I get hit by a truck. I will press them hard to let me do this
at the old price of $110/yr.

This is the Groups.io billing summary for TekScopes:
Invoice Date Plan Payment Method
Amount Paid By
#3055 01/13/19 Premium Visa XXXX XXXX XXXX 7319 USD $110
dennis@ridesoft.com
#814 01/13/18 Premium Visa XXXX XXXX XXXX 7319 USD $110
dennis@ridesoft.com
#793 12/13/17 Premium Visa XXXX XXXX XXXX 7319 USD $10
dennis@ridesoft.com
The next payment of $110 is due 01/13/2000. NOTE: It appears the annual
price for the Premium Yearly Plan will go up the first of the year to $220.

Dennis Tillman W7PF

P.S. This is a way to send money via PayPal with minimal or no fee:
NO FEE PAYMENT METHOD FOR USA TEKSCOPES MEMBERS
* Choose "Send and Request".
* By default the Send tab will be chosen for you.
* In the "Send Money" field enter dennis@ridesoft.com.
* Next PayPal will ask you: "Sending to a Friend" or "Paying for an invoice
or service"?
* Choose "Sending to a friend".
* Enter the amount.
* Press next and choose your bank account to avoid the PayPal fee.
* Press the "Send the Money" button.
* Include your email address and TekScopes ID in the Notes section.
MINIMAL FEE PAYMENT FOR FOREIGN TEKSCOPES MEMBERS
* Chose "Send to friends and family internationally".
* Select the country you are sending to (USA).
* To keep the fee to 1% where it says "Select your delivery method" choose
"Send to a PayPal Balance".
* Under "You Send", enter whatever amount in local currency converts to the
correct US currency.
* Press next.
* The email account you will be sending to is dennis@ridesoft.com.
I can't help you after this point in PayPal because I was not outside the
USA to see what happened next.
* Include your email address and TekScopes ID in the Notes section.



--
Dennis Tillman W7PF
TekScopes Moderator

Chuck, Bruce, and Arden,
All my life I assumed there was little more to learn from how a Variac works. They appear to be pretty simple and a very clever. This has accounted for their incredibly useful life spanning more than 85 years.

The practical side of me says it is a very bad idea to short out a turn on a transformer with 120 (more or less) turns and 120V across it. So tomorrow I will test this by intentionally hooking a short piece of wire from one turn to its neighbor while I am holding the wire in my hand. If you are right the wire won't get hot and I will learn something new. If I am right I will get burned and never trust the three of you again. Either way you have nothing to lose. :)

I will report the results either way.

Dennis Tillman W7PF

Hi David,
but what about the data stored in the chip? how did you transferred the
original NVRAM content?
I think it has the number of hours and power cycles and also SPC constants
in it, right?

Happy New Year to all :o)

On Tue, Nov 19, 2019 at 03:53 PM, David Kuhn wrote:

Ah, I just saw your pics. You are tight too. That must be a very low
profile socket. I think maybe even more so that my lead carrier pins.

My

business depends on my original TDS3032. When this chip failed, I

ordered

another TDS3032 from Alltest Instruments in NJ (~$1500). While I waited
for it to arrive, I did replace the DRAM in my original. I was way too
stupidly nervous at the time (I had to get back up and running) to dig

the

chip out, so I bought a NOS ram. It was okay and worked good. I still

use

my original as my primary (it's my baby - lol and seems to work slightly
better than my "new" one). If I have to do it again, I will definitely

do

it the way you did!

I did learn that I have to hold the B TRIG in while booting it to

initiate

that RAM chip. The screen came up in all kinds of pretty colors without
doing that - lol. Its been good now for about a year and went through
ISO17025 certification well.

Dave

On Tue, Nov 19, 2019 at 3:40 PM Daveyk021 . <daveyk021@gmail.com> wrote:

Hello Raymond,

"That is not necessary. I've added a few pictures of the initial
test-setup in my TDS3034 (now TDS3054) to the album "Clock error on
TDS3034", before clean-up. It can be seen that there's ample space for

a

normal socket and putting a Li cell on top of the RAM"

With my TDS3032 (no bloody A, or B, or C...), I tried a zero insertion
force socket, and another lower profile version, and neither would fit

in

my scope as the I/O module would hit it. I ended up using lead carrier
pins (real old school form the 1980s there, maybe earlier). With lead
carriers, it is just slightly higher (maybe 1/8" - 3/16"), and even

then,

on my scope, the chip "just" cleaned the GPIB/VGA/RS232 module. Maybe

on

the TDS3034, the chip is in a different location?

Dave

On Tue, Nov 19, 2019 at 1:03 PM Raymond Domp Frank <hewpatek@gmail.com

wrote:

On Tue, Nov 19, 2019 at 05:00 PM, David Kuhn wrote:

When replacing the chip, install a VERY LOW PROFILE socket (pin

carriers)

on the PCB.

That is not necessary. I've added a few pictures of the initial
test-setup in my TDS3034 (now TDS3054) to the album "Clock error on
TDS3034", before clean-up. It can be seen that there's ample space

for a

normal socket and putting a Li cell on top of the RAM

Yesterday, I wrote:

You'll find what you're looking for in my message #157465 in thread
"Clock error on TDS3034", including link to pictures of the Dallas

Module.

Link to the photos:

https://groups.io/g/TekScopes/album?id=91131

Raymond

This raises another observation about the brush. It must be narrow so
it doesn't span two turns at a time else it will be shorting out one
turn to the next turn and that will short them together. They would
heat up as would the brush which is causing the short. In my example
this would cause a short across two turns that differ by exactly 1VAC.
But each winding is capable of providing from 1 to 10 Amps under
normal load situations for the size Variacs we are likely to
encounter. With a brush causing a shorted winding it isn't hard to see
that more than10 Amps could flow. To minimize the likelihood of a
short the brush comes to a chisel point. The point is slightly
narrower than one turn of wire and it is as wide as the removed enamel
area of each turn. <

This raises another observation about the brush. It must be narrow so
it doesn't span two turns at a time else it will be shorting out one
turn to the next turn and that will short them together. They would
heat up as would the brush which is causing the short. In my example
this would cause a short across two turns that differ by exactly 1VAC.
But each winding is capable of providing from 1 to 10 Amps under
normal load situations for the size Variacs we are likely to
encounter. With a brush causing a shorted winding it isn't hard to see
that more than10 Amps could flow. To minimize the likelihood of a
short the brush comes to a chisel point. The point is slightly
narrower than one turn of wire and it is as wide as the removed enamel
area of each turn. <

On Wed, Jan 1, 2020 at 11:43 PM, Dennis Tillman W7PF wrote:

The practical side of me says it is a very bad idea to short out a turn on a
transformer

Dennis, you should skip your planned experiment just by considering that we're
not talking about shorting out adjacent turns on a variac - the wiper is a
(carbon and copper, typically) brush, not a metal contact, which are way
different from each other. So picture not shorting with a wire, but with a
resistance network that bridges the turns, and part of the network goes to the
output terminal.

Ed