Thermo Scientific SAM12, Manual

Page: 56 / 176

Operating Instructions Issue: 1.0
5-16 SAM12 User Manual Thermo Fisher Scientific
Select Diagnostics|Detectors Bar
to view the Detectors information
The Detectors are updated every measurement cycle.
Note that the Background Count rate is averaged and updated
over the cycle time selected in the Average Over field.
Select Diagnostics|Information to
view the current Measurement
Information
Description of options:
Field Name Description
MDA (default unit)
Note that this is a view only field.
The Minimum Detectable Activity (MDA) is a
value derived by the SAM12 and is the smallest
activity that can be statistically accurately detected
with the current settings and background. The
MDA is calculated using the probability of
detection, probability of false alarm, monitoring
time and the average background etc. Dashes are
shown if this value is not available.
Detection Limit (cps)
Note that this is a view only field.
This is the MDA expressed in counts per second.
Measurement Period
(s)
Note that this is a view only field.
This is the length of time for the sample calculated
from the current alarm conditions and background
measurement.
Background Rate
(cps)
Note that this is a view only field.
This is the current background rate. The value is set
at 0 if a background has not yet been acquired.
Net Effective Alarm
Rate (cps)
Note that this is a view only field.
This is the effective alarm rate calculated using the
Normal Alarm setting taking account of current
Diagnostics Menu
Detector Bar
Information