Search found 237 matches

by Rex Allers
Fri Aug 17, 2018 4:14 am
Forum: Please Introduce Yourself
Topic: Hello Fusor.net
Replies: 2
Views: 89

Re: Hello Fusor.net

ha ha. Funny typo in "grabage". It was, when you grabbed it out of the dump.
by Rex Allers
Fri Aug 10, 2018 7:40 am
Forum: The Trading Post
Topic: 10x CHEAP TURBOS w/ controller (Pfeiffer TMH 261) on ebay ~$50
Replies: 9
Views: 601

Re: 10x CHEAP TURBOS w/ controller (Pfeiffer TMH 261) on ebay ~$50

So, a couple additional questions for Jerry or whoever else might know. The hirschmann connectors are the odd 4-pin connectors on the back side of the TC600? Is that what brings the power into the controller? These listings show a TIC-250 connecting to the TC600. Am I correct that this is not much u...
by Rex Allers
Wed Jul 25, 2018 10:23 am
Forum: Announcements and Site Administration Topics
Topic: How did you find our Fusor forum?
Replies: 8
Views: 575

Re: How did you find our Fusor forum?

How I got here: I don't remember exactly. It was shortly after Fukushima and I, like many, was learning about rad stuff and detection devices. I might have got here from searches about gamma spec or I might have found a reference from one of Geo's yahoo groups -- geiger or gamma spec. I immediately ...
by Rex Allers
Wed Jul 04, 2018 8:44 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: xray transformer
Replies: 7
Views: 832

Re: xray transformer

Simple ohms law doesn't apply on a transformer. The ohms you are measuring are at DC. The primary will have a large inductance. At the intended operating frequency of the transformer, hopefully that inductance will provide inductive reactance that won't draw the kind of power your DC calculation see...
by Rex Allers
Fri Jun 22, 2018 1:21 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Ballast resistor construction
Replies: 11
Views: 1626

Re: Ballast resistor construction

Nice work, Dan. One minor suggestion, possibly not necessary... At minimum, cut or file the sharp square corners of the resistor terminals to make them rounder. Better would be to also add a metal shape or build with solder a rounded or blob shape to avoid easy arc flash starting points (pun intende...
by Rex Allers
Sat Jun 16, 2018 11:29 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Extensive paper on neutron activation
Replies: 12
Views: 2356

Re: FAQ - Extensive paper on neutron activation

Thanks. For some reason I (incorrectly) interpreted that "the book" was something coming from IAEA. I guess I was thinking along the lines of the Gamma-ray Spectrum Catalogs that can be had as pdf's from INL. (Although I tried a link I had saved today and it failed. Then, starting at the top of inl....
by Rex Allers
Fri Jun 15, 2018 10:08 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Extensive paper on neutron activation
Replies: 12
Views: 2356

Re: FAQ - Extensive paper on neutron activation

Luke,

In your post of the Isotope Browser app, you said, "I still find myself referencing the physical book more." I did some looking around on
https://www.iaea.org/

but I didn't see a document or book that seemed to parallel the app. Can you share what you mean by "the physical book"?
by Rex Allers
Thu Jun 14, 2018 2:20 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: What about "Liquid Scintillation vs. Pancake GM"?
Replies: 5
Views: 1059

Re: What about "Liquid Scintillation vs. Pancake GM"?

Perhaps the actual links make it more clear:

Liquid Scintillation vs. Pancake GM
George Schmermund Nov 11, 2011
viewtopic.php?f=13&t=6245

Liquid Scintillation Cell
George Schmermund Dec 06, 2011
viewtopic.php?f=13&t=6253&p=34697
by Rex Allers
Sat Jun 09, 2018 5:06 am
Forum: Vacuum Technology (& FAQs)
Topic: MKS 901p
Replies: 54
Views: 6692

Re: MKS 901p

The LED action you describe is correct. You didn't actually tell us what pins on the 901p connector you are measuring for the analog. I have gotten three of these. They all have the 3-row 15-pin D connector (like VGA monitors use). I assume yours does too. I haven't seen one yet that wasn't set up t...
by Rex Allers
Fri Jun 08, 2018 12:21 am
Forum: The Trading Post
Topic: MKS 901p vacuum gauges
Replies: 7
Views: 1582

Re: MKS 901p vacuum gauges

A long time back, in another MKS 901p thread, a member was looking for serial software. I did some browsing for ideal software that ran on multiple platforms and had a way to save and call back canned communication strings. I found one I wasn't aware of before called ScriptCommunicator: https://sour...