PRA 17.0.0.0

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Peter-1
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PRA 17.0.0.0

Post by Peter-1 » 03 Jun 2018, 22:53

Hello,
I have installed PRA 17 and it works. But only one question. How can i spread the ROI in this window. All i have made and no result.

Peter
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Spec-1.jpg

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Steven Sesselmann
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Re: PRA 17.0.0.0

Post by Steven Sesselmann » 04 Jun 2018, 14:26

Peter,

Can you describe the problem in more detail. If it is a bug, I shall ask Marek to look at it.

Steven
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

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Peter-1
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Joined: 07 Oct 2016, 01:45
Location: Germany
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Re: PRA 17.0.0.0

Post by Peter-1 » 04 Jun 2018, 23:14

Hi Steven,

as the diagram shows, the spectrum goes to over 5500 keV. But I would like for example, only a range up to 200 or 2500 keV and get a better resolution. How can I do this? It is not about ROI.

Peter

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Steven Sesselmann
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Location: Sydney
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Re: PRA 17.0.0.0

Post by Steven Sesselmann » 05 Jun 2018, 13:40

Peter,

I think I understand your problem now.

To optimise the resolution, you first want to make sure that your volume is appropriate for the range. Assuming that you are interested in the range 0-3000 Kev, you should adjust your volume so the K40 peak appears about in the middle of your screen, or ot 50 arb.u.

The 16 bit sound card has 65,536 bins which in PRA has been divided into the range -100 to +100 arbitrary units, where we for the most part use either the positive range or the negative range, depending on which way your sound card turns the pulse.

Once your volume is set correctly you can change the bin size to increase or decrease the number of bins you see on the screen.

Potential Problem
If your detector is set to the optimum voltage and your sound card is set to 100% and your spectrum is still too far to the left, then you can open the GS-1100-PRO and use the little screwdriver to adjust the output volume via the blue trimmer potentiometer on the board.
Warning:
The right side of the board has high voltage components (2000V when plugged in) touching this may lead to unwanted excitement.


Note, there are two trimmer potentiometers, one is for calibrating the DVM (the one with pink nail polish on screw), the other is the volume adjust.

Steven
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

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