Reference, Questions and Help > Instrument Q&A
Alpha Meter Problems
atomicarcheologist:
Thank you for the generic replies.
I am looking for instrument specific knowledge, does anyone have any regarding this type of scenario?
alphadude:
those probes do respond to light-especially quartz halogen- (could be the IP of the UHP gas is around the energy of quartz halogen energy) First change out the probe. if your problem clears then its the probe- have seen lots of problems with light on those detectors-we had a discussion about it a while back- when you have the problem isolated to the probe you have several options- gas purity problem, moisture build up in the probe, mylar not opaque, discharge corona point, carbonization of the anode,-(someone touched it and left body oils on it ) cold soldier joint, debris in detector, wrong type coax , damaged connector. those probes are pretty simple, also they dont do well in cold. thats about as instrument specific as anyone can get. the voltage plateau should be checked for that specific instrument package.
atomicarcheologist:
It is not the probe. That was determined via probe change out. It is not the cable. That was determined via cable change out. It is not the environment. That was determined by; 1) assessing no radon problem present, 2) same situation in other areas. Ergo, it must be the instrument. Help!
alphadude:
time to tag it out.
atomicarcheologist:
OK. Now that we are done with the elementary generic answerment, has anyone had this experience with an ESP2 before? Is this a correctable condition in the field, field being outside of a calibration/repair lab, without tearing everything apart? When you are doing this type of work, there is not a lot of meters in the inventory, which makes it a challenge when they start going down on you.
I did run this meter past an I&C tech. He said there was nothing wrong with the meter electronically and did a source and a pulse on it. However, under further questioning, he did admit to cleaning the button controls. But he didn't think that would have created the problem.
Help!
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