Experimental Physics and
Industrial Control System

Would anyone object to the EPICS scaler record changing to use floats
instead of ints for counter and preset values?  The change would allow
the record to support 64-bit counters with minimal modification of the
scaler record, and most clients I'm aware of would not even notice the
difference.

There is the issue of precision: a float has 23 bits of precision, so
the smallest possible difference in two scaler values is roughly one
part in 10^7.  Since scaler time bases I'm aware of are accurate only
to a few parts in 10^5, it seems that we'd lose nothing essential by
going to floats.

Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab

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