Search found 56 matches

by Svilen
24 Mar 2017, 18:03
Forum: Detectors
Topic: Harshaw 8S8/2A-X
Replies: 18
Views: 8160

Re: Harshaw 8S8/2A-X

Thanks Steven! The thorium mantle is quite hot, I wonder if it will detect something weaker, but hope so. Do you think this spectrum is good enough to try calibration with it? I very likely wouldn't touch the hardware for now, but just in case I try it in the near future - would you please tell me w...
by Svilen
23 Mar 2017, 20:09
Forum: Detectors
Topic: Harshaw 8S8/2A-X
Replies: 18
Views: 8160

Re: Harshaw 8S8/2A-X

Thanks again, Steven! Yes, the GS is the 1100A model. I still can change the resistors to increase the gain if you think it is a good thing to try? Otherwise, I boosted the software gain to 2 and below is what I got: Thorium mantle, ~2000 sec acquisition, no shielding, gain boost 2, bin size 0.01: h...
by Svilen
23 Mar 2017, 11:38
Forum: Detectors
Topic: Harshaw 8S8/2A-X
Replies: 18
Views: 8160

Re: Harshaw 8S8/2A-X

Excuse me please, now the login name is my real one.

At the moment the pulses I get are between 40-50 au, which amplitude would be the best to achieve after turning the trimmer?
Well, we have a problem - there are actually no trimmers in my GS !?
by Svilen
22 Mar 2017, 21:42
Forum: Detectors
Topic: Harshaw 8S8/2A-X
Replies: 18
Views: 8160

Re: Harshaw 8S8/2A-X

Thank you for your response Steven! The count rate stops to increase significantly after 850V, so I guess 850-900V should be the optimal value for this tube. This is what I get from InTune with the thorium mantle and volume set to 100%: Noisy? https://s16.postimg.org/g89ak9a3p/image.jpg Then I used ...
by Svilen
22 Mar 2017, 10:07
Forum: Detectors
Topic: Harshaw 8S8/2A-X
Replies: 18
Views: 8160

Harshaw 8S8/2A-X

I was going to open the Bicron detector from my previous post and rebuild the voltage divider the way I need it, but I found this detector - Quartz & Silice holland b. v. (Harshaw crystal) 8S8/2A-X and it seems it works! I made a 12M voltage divider as Steven explains in one of his articles (thanks ...
by Svilen
10 Oct 2016, 19:09
Forum: Detectors
Topic: Bicron detector wiring
Replies: 20
Views: 6994

Re: Bicron detector wiring

Hi Steven, Sorry if I disturb you, but can you please tell me what do you think about the setup shown in my previous post? Is this what you also meant as a proper connection ? If so, I maybe should plug the signal BNC to an oscilloscope and check if there are pulses (in case there is still something...
by Svilen
06 Oct 2016, 22:52
Forum: Detectors
Topic: Bicron detector wiring
Replies: 20
Views: 6994

Re: Bicron detector wiring

I think so Steven, this is how I connected it, with the difference that I used 1nF 3KV capacitor as Luuk adviced in his post. Luuk said: "Black is + HV Red = ground Mantel Coax= ground Centre coax needs a 1nF/1kV capacitor serial is signal (warning on the centre of the coax is high voltage that is w...
by Svilen
06 Oct 2016, 20:34
Forum: Detectors
Topic: Bicron detector wiring
Replies: 20
Views: 6994

Re: Bicron detector wiring

Hello again "radioactive" people, Thank you for your post Willem! I connected the detector the way Luuk proposed me, but unfortunately it didn't work. No signal. I got only some noise, when I boost up all the controls of the sound card. I tried with both PRA and Intune. Tried on another computer - s...
by Svilen
27 Sep 2016, 02:17
Forum: Detectors
Topic: Bicron detector wiring
Replies: 20
Views: 6994

Re: Bicron detector wiring

Thank you very much Luuk! I'll try it and report back the result.
by Svilen
25 Sep 2016, 06:55
Forum: Detectors
Topic: Bicron detector wiring
Replies: 20
Views: 6994

Re: Bicron detector wiring

Yes, but I have the GS model with two BNC ports which supports also separated HV bias and signal, can't I use it for this detector without modification then ?