| T O P I C R E V I E W |
| jadongreen |
Posted - 01/21/2026 : 01:57:26
Hi everyone,
I’m a regular user of GQ Geiger counters and have been using them for both hobby and basic environmental monitoring for some time. My main unit is a GQ GMC-320+, firmware updated to the latest available version, mostly used for background radiation checks indoors and occasional outdoor measurements. I usually log data via USB to a Windows PC, with default CPM and µSv/h settings, and the device has always been reliable until recently.
Over the past few days, I’ve started noticing a few issues. First, the readings have become unstable, showing sudden spikes even when the counter is stationary in a low-background area where values were previously consistent. Second, the USB connection intermittently drops, causing the data logging software to disconnect unless I reconnect the cable or restart the device. I’ve tried resetting the unit, using a different USB cable and port, and running it on battery only, but the problem persists.
Has anyone experienced similar behavior with the GMC-320+ or other GQ models? I’d really appreciate any advice on whether this could be a sensor issue, firmware-related, or something else I should check before considering repair or replacement. Thanks in advance for your help. |
| 1 L A T E S T R E P L I E S (Newest First) |
| ullix |
Posted - 01/25/2026 : 02:43:43
Not sure if this advice helps with this counter and its firmware, but in similar cases this heavy fluctuation was caused by the FET setting. Set FET to 60 (sec) to switch it off, then observe if spikes re-occurr. |
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