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On 5/7/2024 7:35 PM, cheater cheater wrote:

Hmm... anything less rare? Anything I could take with me on the go?

Gold leaf is the standard for electroscopes because it can be beaten far thinner than other metals. It has been the standard for leaf electroscopes since British physicist Abrahm Bennett used it in 1787. There are pith ball electroscopes which are less sensitive than gold leaf electroscopes.

As I said upstream, if you need to detect the direction of the current you need a sensitive galvanometer.

--
Dale H. Cook, Member, NEHGS, AGS, MA Soc. of Mayflower Descendants;
Massachusetts State Coordinator for the USGenWeb? Project;
Administrator of

Hello,

I and a friend changed out the batteries in my newly purchased 2712 today. The GPIB battery was totally dead on an unloaded meter... The other battery had 3.xx left. Both batteries were swapped with new ones. They fit perfectly on the board! Thanks to all that answered and suggested batteries here! Also, thanks to whoever told me to hurry once you put in the GPIB board battery, the 2712 got powered up maybe 3 to 5 minutes after the GPIB battery was soldered in place.

When I run the self normalization all seems good until I get:

Amplitude Normalization Failed

The scope appears to be working well, I hang an antenna off it, and transmit with an HT on 146.52, and see a waveform, the right width, etc...

My God Tek builds nice equipment... There is not even any dust in the unit, save a tiny amount near the end of the CRT HV. All the boards look brand new, nothing has leaked, and it was even calibrated in 2015 by Tek...

So what does the Amplitude Normalization failed mean in terms of repair, and/or operation? Do I need to worry? Is there something else I should do, and try again?

--
73, and thanks,
Dave (NK7Z)

ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

Hmm... anything less rare? Anything I could take with me on the go?

On Wed, May 8, 2024 at 12:12?AM Dale H. Cook via groups.io
<bridgewaterma@...> wrote:

On 5/7/2024 4:43 PM, cheater cheater wrote:

also why buy aluminium leaf? why not use alu foil?

Aluminum foil is far too thick. An electroscope needs minimum mass, and
that means leaf, not foil. The repulsive force in an electroscope is far
too low for foil to work.

For detecting direction of current flow you want a sensitive
galvanometer, of the type used as a detector for instruments such as a
Leeds & Northrop Type K-3 Universal Potentiometer. You would probably
need an adjustable current limiter of fairly high resistance to avoid
damaging the galvo.
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA

On 5/7/2024 4:43 PM, cheater cheater wrote:

also why buy aluminium leaf? why not use alu foil?

Aluminum foil is far too thick. An electroscope needs minimum mass, and that means leaf, not foil. The repulsive force in an electroscope is far too low for foil to work.

For detecting direction of current flow you want a sensitive galvanometer, of the type used as a detector for instruments such as a Leeds & Northrop Type K-3 Universal Potentiometer. You would probably need an adjustable current limiter of fairly high resistance to avoid damaging the galvo.
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA

Looking for a nice crack free front cover for the 465/475 scopes with DM44 or the 468. Thanks.

Hair on the wheels and some plastic of the wheels rubbing together generate lots of ES charge. Sort of like a van de graaff generator.

OK, so looking into it, a gold leaf electroscope will detect the
presence of _a charge_, but what i want is to figure out the _sign_ of
the current when an item is discharging into another item. I don't
think a gold leaf electroscope will do that, but i might be wrong. let
me know.

also why buy aluminium leaf? why not use alu foil?

On Mon, May 6, 2024 at 5:03?PM Glenn Little via groups.io
<glennmaillist@...> wrote:

Google provided this:

I built one in jr high school.
Very easy.
You can use aluminum leaf available at a sign maker.

Glenn

On 5/5/2024 9:56 PM, cheater cheater wrote:

How do you make one?

On Mon, May 6, 2024 at 12:41?AM jspencerg via groups.io
<jspencerg@...> wrote:

It is easy to make an electroscope. Walk around store with your finger on the electrode and observe when you get charged. Wear a foil hat if you don't want to answer any questions.

--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

Hi,
I'm looking for a Keithley 2000 motherboard.
Mine has some broken PCB tracks but I can't fix it.
The PCB is multilayer.
Thanks if anyone can help me.
Mauirzio

Is anyone looking for a 575? I have two spares and need the room. PM if interested. I am in Kentucky.
ThanksJeff Kruth

Hi,
I'm looking for a Keithley 2000 motherboard.
Mine has some broken PCB tracks but I can't fix it.
Thanks if anyone can help me.
Mauirzio

Bob Koller <fourdesigns@...> added folder */TG2000 SOFTWARE*

*Description:*
TG2000 SOFTWARE



---

The following files and folders have been uploaded to the Files area of the [email protected] group.

* /TG2000_SW.zip ( /g/TekScopes/files/TG2000_SW.zip )

*By:* Bob Koller <fourdesigns@...>

*Description:*
TG2000 SOFTWARE

I just uploaded the SW, check the files section.

Enjoy!

Hi all, I can aquire a second hand TG2000 ( Video Signal generator platform ) for 50 euro but the device was for a very longtime in storage and so the NVRAM backup battery is dead and all the signal patterns need to be reloaded to NVRAM from PC. For this one needs a PC software called SDP2000 , which the seller does not have . Does anyone have a link for dowload of the software ? Thanks in advance. Greets. Johan

John,
I have some single slot, one three slot, and a bunch of four slot TM500
frames.
I also have a bunch of 500 series plugs - sold a few recently and got some
left over ones. Let me know what you may be looking for.
Interestingly, I also have a very affordable FG501 that is listed for sale
and still available.
Let me know if you're interested in any of the above - can be offline.
Radu.

On Mon, May 6, 2024 at 7:27?PM John Hancock via groups.io <nerdful1=
[email protected]> wrote:

I bought it. I miss the tm500 rack stuff. Hope I can buy something to put
it in. Looking for a defective rack unit I can repair.
Or a perfect one if possible.

John

I bought it. I miss the tm500 rack stuff. Hope I can buy something to put it in. Looking for a defective rack unit I can repair.
Or a perfect one if possible.

John

Yeah have a number of Keithley items (a couple 181, a couple 192, a few 197, a 228A, a 196, 150, 131, 130, 128), nothing current only working older pieces in my meter collection, and still have a 2000 that I havent fully refurbished. Have been looking for a 263 for a while.

Also a little surprised that there isnt a Keithey specific forum.

Thanks to a member of this forum (John Griessen) I was able to get my scope up and running again! Big thanks, John!

It's better that way- then you can actually use/move/drive them without too much worry.

Selling my Tektronix FG501 function generator. Works with no issues.

Yes. He certainly has some nice equipment to do that work. I wish I could do the same with my pushbuttons. I've seen the other methods but that looks the best by far.

Barry - N4BUQ