Gem-5 User’s Manual v
Counting Statistics ...................................................................................................................... 270
Confidence Levels .................................................................................................................. 270
K Alpha - False Alarm Due to Background Rate ................................................................... 274
K Beta - Positive Alarm Due to Contamination ..................................................................... 275
K Delta - Change in Background Rate ................................................................................... 275
Background Rate ........................................................................................................................ 275
Background Rate Calculations ............................................................................................... 275
Background Variance Ratio ................................................................................................... 277
Background Rate Reset .......................................................................................................... 278
High Background Rate Settings and Strategy ........................................................................ 279
Low Background Rate Setting and Strategy .......................................................................... 282
Measurement Variance Ratio Setting and Strategy (Background Change Tracking) ............ 284
Alarm Settings and Strategy ....................................................................................................... 285
Alarm Trip Points ................................................................................................................... 286
Counting Time Strategy ......................................................................................................... 289
Background FALSE Alarm Rate (FAR) ................................................................................ 290
Confidence of Alarm .............................................................................................................. 291
Efficiency Calculation (and Derived Efficiencies) ..................................................................... 291
B. Operating Files and Directory Structure .................................. 294
Basic Structure ............................................................................................................................ 294
Custom Files ............................................................................................................................... 295
Driver Files ................................................................................................................................. 297
SetupTXT Files .......................................................................................................................... 297
Settings Files .............................................................................................................................. 297
Setup Menu ............................................................................................................................ 297
Test Menu .............................................................................................................................. 299
Additional Test Menu ............................................................................................................ 300
Factory Setup Menu ............................................................................................................... 301
History Files ............................................................................................................................... 301
Temporary Files .......................................................................................................................... 302
Viewing Datalog Files with Excel .............................................................................................. 303
Sound Files ................................................................................................................................. 304
Voice Files .................................................................................................................................. 304
Creating Wave Files ................................................................................................................... 307
C. Special Information .................................................................... 309
Alarm Test vs. Occupant Alarm ................................................................................................. 309
Case 1 ..................................................................................................................................... 309
Case 2 ..................................................................................................................................... 310
Initial Setup ............................................................................................................................ 310
Self Shielding ......................................................................................................................... 310
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