Bnc SAM 935 Portable Gamma Spectroscopy System Manual de usuario descargar pdf (Pagina 47)

SAM 935™ Instruction Manual 43

F2, Edit an Isotope: Scroll down the list of isotopes to the isotope you wish to monitor. Press

NTER, and you will be returned to the Select list.

F3, Delete a Trigger: The trigger will be deleted.

F4, Change a Trigger Level: Use the ← and → arrows to select a digit; use the ↑ and ↓ arrows to

change the digit. When you’re finished, press E

NTER.

Monitor and Detail Modes Only: The strength of a trigger is measured in terms of standard deviations

above background, where the background is measured over the same region of the spectrum. For exam-

ple, in the case of a full spectrum, if the number of counts per second in the background spectrum was

100, then its standard deviation would be 10. If the number of counts in a measurement period was 145

counts per second, then the net counts above background would be 145 – 100 = 45, and the reported ratio

would be 45/10 = 4.5. This would trigger an alarm if the corresponding trigger level was set to 4 or less.

6.1.3 Set the Default Trigger Levels

The factory-set default trigger levels are:

5 All Isotopes

8 FULL Spectrum

7 Unidentified Peak

Default values apply only when an item is added to the list of triggers being monitored.

To change the default trigger levels:

1. Select

Set Default Trigger

on the Monitor Setup menu

for the type of default being set (Iso, Full, or Peak) and

press E

NTER:

2. Use the ← and → arrow keys to select a digit; use the

↑ and ↓ arrow keys to increase or decrease the value.

3. Press E

NTER when finished. CANCEL will exit without

changing the original value.

4. Either select another default trigger level to edit or

press E

NTER to return to the Monitor Setup menu.

Cursor Points To F2 F3 F4

ISOTOPE – Allows you to

select an isotope

Any Isotope

EDIT - Allows one isotope to

be replaced by another

DELETE the FULL trigger

from the list

TRIG LVL– Allows you to

change the trigger level

FULL

DELETE – Removes the

FULL trigger from the list

TRIG LVL – Allows you to

change the trigger level

PEAK

DELETE – Removes the

PEAK trigger from the list

TRIG LVL – Allows you to

change the trigger level

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Bnc SAM 935 Portable Gamma Spectroscopy System Manual de usuario Pagina 47

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