Sigma BM-286A Service Manual

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: 

 

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: 

 

3. SpAct:  Radiation alarm level, above background, in pCi per gram.