SIGMA BM-286A - Manual (Page 24)

3. OPERATING INSTRUCTIONS page 21
Model BM-286A
Alarm Level:
The operator will be prompted for the alarm level (depending on the alarm type
selected above). Enter the alarm level (above background) in the appropriate
units.
The previous value will be displayed, and will only be accepted by entering it
again, or a new value may be entered.
1. DPM:
Radiation alarm level in disintegrations per minute. Enter a value between
10,000 and 1,000,000,000
. This is the level above background that will generate
a radiation alarm when the DPM alarm type is selected.
NOTE:
This value is used only when the Alarm Type is set to DPM.
2. N*Sigma:
Radiation alarm level in N*Sigma (N*1background + background). This is the
count level that will generate a radiation alarm when N*Sigma alarm type is
selected.
NOTE:
This value is used only when the Alarm Type is set to N*Sigma.
3. SpAct: Radiation alarm level, above background, in pCi per gram.