Search found 48 matches

by John Myers
Fri Jan 18, 2019 6:23 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)
Replies: 38
Views: 19888

Re: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)

Rex, It's being able to consistently sync multiple discrete IO and interrupt signals that older micro-controllers like AVR can't do well. More modern MCU's like Xmega's do have special modules built in to address these issues. Most ADC's in MCU aren't designed for high speed, their just meant for ba...
by John Myers
Fri Jan 18, 2019 5:20 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)
Replies: 38
Views: 19888

Re: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)

The Arduino code base is meant to be user friendly not necessarily quick and efficient. So even though an Atmel AVR chip can handle 'sensing' frequency's above 3Mhz the Arduino library and the skill of the programmer will limit the actually max frequency that can be counted accurately. Micro-control...
by John Myers
Sun Jan 13, 2019 9:45 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Test Sources Po210+Be or U238+Be?
Replies: 17
Views: 7193

Re: Neutron Test Sources Po210+Be or U238+Be?

Sealed sources and/or exempt amounts don't require a license for the person receiving it. I just spent a little time on the NRC site and I don't see anything specific to neutron sources that prevents a licensee from distributing a sealed neutron source to the public.
by John Myers
Thu Jul 05, 2018 9:53 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: WA6-30N High Voltage Enable
Replies: 2
Views: 3264

Re: WA6-30N High Voltage Enable

Are you you enabling (shorting) the safety interlock before plugging in the AC power?

Section 3-1 in the manual shows the steps you need to follow.
Section 4-4 states that if the interlock is opened the output is cut off until the AC power is removed and turned on again.
by John Myers
Wed Jun 06, 2018 9:36 pm
Forum: Images du Jour
Topic: Cryocooler
Replies: 1
Views: 2048

Cryocooler

Got a cryocooler unit at an auction for $140. Does anyone have a guess as to the manufacture? It came with turbo pump controller but the only number on the controller is MR0808Y029, which I can't find any info on. It didn't come with the Turbo pump so I'm not sure which brand of pump it's suppose to...
by John Myers
Tue Mar 13, 2018 7:58 am
Forum: Vacuum Technology (& FAQs)
Topic: Capillary tubing & connectors for chromatography for D2?
Replies: 5
Views: 2865

Re: Capillary tubing & connectors for chromatography for D2?

It looks like a gas chromatography column, but not sure why it would be flattened.
by John Myers
Wed Mar 07, 2018 4:32 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Reusability of Swagelok
Replies: 14
Views: 9080

Re: Reusability of Swagelok

Ferrules aren't meant to be removed and re-crimped on a new tube. If you manged to get one of it would probable be too deformed to get back on a new tube.
At work I reuse the nuts all the time, just cut of a section of the tube and add new ferrules.
by John Myers
Wed Jan 24, 2018 5:37 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: The Beginnings of a Fusor Electrical System
Replies: 59
Views: 27356

Re: The Beginnings of a Fusor Electrical System

It looks to me that the two primary's are meant to always be in parallel. Putting primary's in parallel is done to increase the current that can be transferred to the secondary not to increase the voltage at the secondary. I agree with Richard about the 120/220V based of the resistance difference be...
by John Myers
Thu Jan 18, 2018 11:36 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: High Voltage Supply for PMT
Replies: 9
Views: 5450

Re: High Voltage Supply for PMT

I think it's an 'economy of scales issue' where it's not really worth it for distributors like Mouser and Newark to sell CCFL transformers anymore. Especially with LED's taking over. You'll likely need to buy straight from the manufacture. CTX210609-R is obsolete but there may be other similar parts...
by John Myers
Mon Jan 08, 2018 3:34 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: The Beginnings of a Fusor Electrical System
Replies: 59
Views: 27356

Re: The Beginnings of a Fusor Electrical System

The center tap of that transformer is grounded to its own metal case.

The meter and sense resistor is connected in between system ground and the metal case of the transformer.