PCM-2 Manual.pdf - Voss Associates

Section 7
Calibration
Overview
Adjustment of the unit's detectors high voltage setting, beta threshold, and alpha
threshold are all computer controlled in the PCM-2. Computer control of these
settings means that the technician can perform a complete electronic set-up and
calibration of the monitor through the computer keyboard and display without the
use of a screwdriver or other tools.
Calibration and maintenance utilities provided by the embedded PC controller
permit the technician to perform automatic detector plateaus, view background
count rates, perform efficiency determinations, perform beta-alpha crossover
analysis and generate calibration reports.
PCM-2 - VERS ION V1. 9
View Edit Status CaL ibration Uti l ities
source Check
Background Plateau
Source Plateau
Efficiencies
sHield factors
statistical Variance Test
False Alarm Test
calibration Report
Source Check
The instrument's ability to detect radiation may be checked by placing a source on
one or more detectors and verifying that an alarm occurs. Source check mode
uses the same count times and parameters as normal counting mode, however for
convenience it is not necessary to close the body position switches. Count cycles
are run continuously until check mode is exited, and all detectors which have
alarmed are shown in red on the map display. This simplifies the task of
remembering which detectors have been successfully checked. Results are stored
in SOURCE.TXT and can be viewed and/or printed at the conclusion of the test.
The results are stored in a day file if the user has enabled this feature.
PCM2.MANI REV AI April 1995 /-1