Chapter 2 Getting Started
System Master Clear
This selection clears or resets all of the items as described in the system reset, and the
following parameters:
Detector gain is cleared requiring the detector auto gain procedure to be run before
any data may be taken.
Sample and guard detector voltages are reset to 0 volts.
All system unique ID values are reset. Care should be taken after executing a
System Master Clear on an
i
Matic used in conjunction with
i
Link™, since there
may now be duplicate keys used to identify procedures, calibrations, data samples,
etc. in
i
Link.
The date and time of day are reset to 12:00 am, January 1, 2000.
A confirmation screen follows this menu selection allowing you an opportunity to
abort. The system will default to the System Master Clear reset without providing the
System Initialization menu if the battery backed up RAM is corrupted or if the RAM
battery has failed or is removed.
Demo/Troubleshooting Mode
The
i
Matic contains a statistically random pulser that can be used to test and train users
on the system without the use of radioactive sources. The demo mode is entered by
turning the main power switch off and then turning the power back on while holding
the
Count
button down. The front panel display will indicate that the system is in
Demo mode. When in this mode, all sample counts are generated by the pulser.
Background, efficiency, and user procedures can all be run as though there were real
samples in the system. The Demo mode is exited by turning the main power switch off
and then back on.
Background Calibrations and Daily Background QC Checks
When in the demo mode and performing a Background Calibration or Daily
Background QC Check, the pulser produces a spectrum with a statistical distribution
similar to that of an actual background measurement.
α
Efficiency Calibrations and
α
Daily Efficiency QC Checks
When in the demo mode and performing an
α
Efficiency Calibration or
α
Daily
Efficiency QC Check, the pulser produces a spectrum with a statistical distribution
similar to that of an actual
241
Am efficiency measurement and a counting rate of 35% of
the decay-corrected rate of the selected calibration source.
4
iMatic Automatic Counting System User's Manual - 9239221K
