1/2 x like graph starting on Dec 29. - ideas?


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Message boards : Science : 1/2 x like graph starting on Dec 29. - ideas?

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shack
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Message 3412 - Posted: 8 Jan 2016 | 2:15:32 UTC

Any ideas what could cause this?
http://radioactiveathome.org/scripts/graph/drawweekdotted.php?hostid=14364

There seems to be a spike about every hour.
We tried locating the problem looking at our machine for some hours now
but couldn't yet figure out what might cause this.

shack
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Message 3413 - Posted: 8 Jan 2016 | 3:50:51 UTC - in response to Message 3412.

More on the issue:
hier noch nen paar fotos:
First occurence 29. december:
http://paste.krebsco.de/aGrxfcGT

'aftermath' after the first peak:
http://paste.krebsco.de/GhGFucGR


It seems like there was a previous peak on 5. november
http://paste.krebsco.de/2yJbexHZ

--Norbert
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Message 3414 - Posted: 8 Jan 2016 | 5:46:59 UTC

When this happens, does the LCD display also show the same values, alternating high and low? If so, there must be a problem with the tube or electronics. In addition, before the spike, the hourly values seem to be mostly the same value, not fluctuating naturally. All the other sensors show variation every sample and for the hourly values too. If the LCD display does not change on a second-by second basis, this also points to a detector issue.

Profile ChertseyAl
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Message 3415 - Posted: 8 Jan 2016 | 17:22:51 UTC

Try a different USB port, ideally on a different MB hub (front rather than rear or vice versa), just to eliminate power supply issues first!


____________

shack
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Message 3416 - Posted: 11 Jan 2016 | 2:23:59 UTC - in response to Message 3415.

I don't exactly know what fixed the problem - but just if someone else stumbles across a problem alike - we:
- changed the USB cablea
- plugged the geiger counter in a different usb port
- cleaned the casing with pressured air
- taped the lcd hole shut (no LCD in our geiger counter)

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Message boards : Science : 1/2 x like graph starting on Dec 29. - ideas?


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