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 GMC-800 Fast Estimate question

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T O P I C    R E V I E W
dkshema Posted - 05/19/2026 : 10:26:02
I'm new to the GMC-800 and see there are settings for Fast Estimate. The user manual doesn't actually discuss the settings, or the advantages or uses of the various options.

Can someone explain the difference in the settings, and when one setting might be more useful than another?
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EmfDev Posted - 05/19/2026 : 11:38:17
It is how fast the device calculates CPM (Counts Per Minute). 5 seconds means that it only uses the last 5 seconds of data to estimate the CPM. CPM is used to convert to µSv/h. Less Fast Estimate Settings would mean the device will react faster for a sudden rise or fall but will be a little more jumpy. 60 second estimate will be more stable but reacts slower. Dynamic automatically adjusts the window. Adaptive uses the formula below:
Using Exponential Moving Average (EMA)
CPM_fast = a*CPM_instant + (1-a)*CPM_fast_old

Adaptive-Fast
CPM_instant = 60.0*last_second_count;
if (CPM_instant < LOW_CPM_THRESHOLD) a = 0.08;
else if (CPM_instant > HIGH_CPM_THRESHOLD) a = 0.40;
else a = 0.15;

Adaptive-Stable
a = 0.1
CPM_instant = (5_second_count*12)

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