GQ Electronics Technical Support Forum - Help! - Now my GQ 320 Plus reads between 1.9 and 3

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2.GQ Geiger Muller Counter

Help! - Now my GQ 320 Plus reads between 1.9 and 3

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WilliamEvans

South Africa
6 Posts

Posted - 07/13/2017 : 23:03:26

Hi All.
I am hoping that someone can give me guidance as to what could cause this
As per my previous post my GQ was reading in the thousands. ZLM recommended I get GQ to send me a replacement tube. They agreed that he was correct and were happy to send me a replacement. Almost 2 months later (post to South Africa is ridiculous) it arrived and I replaced the tube.
However, the new readings are now an ACPM of between 1.9 and 3 at 100 minute counts. Where is the background radiation of 20-30?
Is there a setting on the GQ 320-Plus to set sensitivity, or have I received a dud Tube, or is the whole counter faulty?

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William Evans
Enterprise Data Management Expert

Reply #1

ZLM

1261 Posts

Posted - 07/13/2017 : 23:09:47

If you replaced the tube yourself, please check if you have installed the tube correctly for the positive and negative polarities. Also, if possible, check the tube voltage with a multimeter on a 1000V range.

Reply #2

WilliamEvans

South Africa
6 Posts

Posted - 07/14/2017 : 00:47:32

ZLM - You are correct - Polarity was reversed - All good now!! Just for that I will give you something to be aware of https://www.youtube.com/watch?v=sWCU3Z6Fay0&t=863s. Start at about the 40 Minute mark.

William Evans
Enterprise Data Management Expert

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