How to hookup a rate meter?

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Steven Sesselmann
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How to hookup a rate meter?

Post by Steven Sesselmann » Thu Aug 24, 2006 10:24 am

Hi Guys,

Could any of you help me out with a suggestion on how to hook up a simple rate meter to count the clicks from an old Victoreen neutron counter. It only has a "phone" output, which seems to output around 7 mv with each click.

What will I need and how do I wire it?

Any advise appreciated..

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

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Richard Hull
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Re: How to hookup a rate meter?

Post by Richard Hull » Thu Aug 24, 2006 2:43 pm

The phone jack is good enough, though it is hard to believe a 7mv click would drive a set of 2K ohm phones. I would stick a buffer audio amp on the jack and then feed it to a digital counter. A single transistor ought to do it.

Probably the cheap and dirty way is to hike down to Radio Crack and buy one of those audio amp/speaker combos in a wall mounted blister pak for about $14.00 and use its output to drive the counter.

Richard Hull
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Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

richnormand
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Re: How to hookup a rate meter?

Post by richnormand » Thu Aug 24, 2006 5:54 pm

That will probably work well.
Here is my setup with a 900V PS to drive the GM capacitor coupled to the preamp (that will get replaced by a 50-cent 741 op-amp as soon as I have time). The Ithaco preamp was nice to determine the low and high frequency cutoff and proper amplitude to properly drive the ratemeter. The idea is to ensure that one count is not interpreted as multiple counts by the ratemeter and thus defeating its purpose.
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George Schmermund
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Re: How to hookup a rate meter?

Post by George Schmermund » Thu Aug 24, 2006 7:49 pm

It's probably a good time to start looking for and collecting NIM stuff on eBay. Start with a bin w/power supply and then get a ratemeter, amp, counter/timer, etc. You'll need them all eventually.
Anything obvious in high vacuum is probably wrong.

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Steven Sesselmann
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Re: How to hookup a rate meter?

Post by Steven Sesselmann » Thu Aug 24, 2006 9:49 pm

Thanks for the advise...

What does NIM stand for?

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

George Schmermund
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Re: How to hookup a rate meter?

Post by George Schmermund » Thu Aug 24, 2006 11:20 pm

Nuclear Instrumentation Module
Anything obvious in high vacuum is probably wrong.

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Steven Sesselmann
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Re: How to hookup a rate meter?

Post by Steven Sesselmann » Fri Aug 25, 2006 1:06 am

Thanks,

What does it do?

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

George Schmermund
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Re: How to hookup a rate meter?

Post by George Schmermund » Fri Aug 25, 2006 2:01 am

Go to www.ortec-online.com. Check products. See Modular Electronics. It represents one of the larger tips of the iceberg.
Anything obvious in high vacuum is probably wrong.

Tman
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Re: How to hookup a rate meter?

Post by Tman » Fri Aug 25, 2006 2:07 am

NIM is just a classification, there is no one nim module.
Start with a small nimbin, which is a rack for nim modules. The nimbin has a built in power supply to power the modules.

Each module is normally around 2-1/2" wide by 8' tall, and plugs right in to the bin.

The first units that would probably be of most use would be a: Rate meter (for cpm) , amp , counter/timer (for total counts).

A nim unit is a good thing to have.

In your case, you would hook the phone jack on your unit to the input of the amp. Then from the output of the amp you would either go to the ratemeter to get your neutron rate (cpm). Or the counter to give you your total counts over time.

hope this answers some of your questions.

-Thiago Olson

Jon Rosenstiel
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Re: How to hookup a rate meter?

Post by Jon Rosenstiel » Fri Aug 25, 2006 4:04 am

In this forum do a search for "nim faq".

Jon Rosenstiel

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